Fluke PM6685R, PM6685 Service Manual

Programmable
Frequency Counter

PM6685 & PM6685R

Service Manual

This is a complementary service manual covering instruments with manufacturing numbers exceeding 840684. The principal

differences are to be found in Chapter 7 and in Chapter 8 due to a major redesign of the main PCB.

Do not dispose of the previous edition, identified by the part number, 4822 872 25012, and the publishing date, June 1996.

You may have to refer to it for information on older instruments as well as options not mentioned here.

4822 872 20106

First Edition (May 2003)

No part of this manual may be copied without the express permission of the copyright owner.

All product names are trademarks of their respective companies.

Ó 2003 Pendulum Instruments AB

All rights reserved. Printed in Sweden.

Contents

1 Safety Instructions

2 Performance Check

General Information .........................2-2

Recommended Test Equipment ................2-2

Front Panel Controls .........................2-2

Short Form Specification Test ..................2-3

Rear Input/Output ...........................2-4

Measuring Functions .........................2-4

Options ...................................2-5

3 Disassembly

Removing the Cover .........................3-2

Reinstalling the Cover ........................3-2

PM9624 (HF Input) ..........................3-2

PM9626B (GPIB Interface) ....................3-3

PM9691 or PM9692 (Oven Oscillator) ...........3-3

4 Circuit Descriptions

Block Diagram Description ....................4-2

General ..................................4-2

Hardware Functional Description ...............4-4

Front Unit .................................4-4

Main Board ................................4-5

Rear Panel Unit ............................4-13

Optional Units .............................4-14

Software Functional Description ..............4-15

Test Routines .............................4-16

5 Repair

Preventive Maintenance.......................5-2

Calibration .................................5-2

When to Replace the Fan

(PM6685R only ) ............................5-3

Troubleshooting .............................5-4

General ...................................5-4

Safety Inspection and Test After Repair .........5-9

General Directives...........................5-9

6 Calibration Adjustments

Introduction ................................6-2

Preparation ................................6-2

Power Supply ..............................6-2

Input Amplifier ..............................6-3

Reference Oscillators ........................6-4

Other Options ..............................6-6

7 Replacement Parts

Introduction ................................7-2

Mechanical Parts............................7-3

Main Board ................................7-6

Front Board ...............................7-12

GPIB Interface (PM9626B) ...................7-13

8 Drawings & Diagrams

How to read the diagrams.....................8-2

9 Appendix

How to Replace Surface Mounted Devices........9-2

Electrostatic discharge .......................9-3

Glossary ..................................9-4

Power Supply Switchmode Module .............9-5

Circuit Descriptions ..........................9-5

Repair ....................................9-6

Calibration Adjustments ......................9-7

Replacement Parts..........................9-8

PM6685R ..................................9-12

Introduction ...............................9-12

Performance Check ........................9-12

Functional Description.......................9-12

Calibration Adjustments .....................9-13

Replacement Parts .........................9-14

This page is intentionally left blank.

Chapter 1

Safety Instructions

WARNING: These servicing instructions are for use

by qualified personnel only. To reduce the risk of
electric shock, do not perform any servicing other
than that specified in the Operating Manual unless
you are fully qualified to do so.

Authorized service and calibration of this instrument is available
through your Fluke representative. See address at the end of this
manual.

Read this chapter carefully before you check, adjust, or repair an in
strument.

The ground symbol on the rear panel indicates where the
protective ground lead is connected inside the instrument.
Never remove or loosen this screw.

When the instrument is brought from a cold to a warm environment,
condensation may cause hazardous conditions. Therefore, ensure
that the grounding requirements are strictly met.

Power extension cables must always have a protective ground con
ductor.

-

Indicates that the operator should consult the manual.

-

Caution and Warning Statements

You will find specific warning and caution statements where neces
sary throughout the manual.

CAUTION: Indicates where incorrect operating proce

dures can cause damage to, or destruction of,
equipment or other property.

WARNING: Indicates a potential danger that requires

correct procedures or practices in order to prevent
personal injury.

This Timer/Counter has been designed and tested in accordance with
safety class 1 requirements for Electronic Measuring Apparatus of
IEC (CENELEC) publication EN61010-1, and CSA 22.2
No. 1010-1, and has been supplied in a safe condition.

This manual contains information and warnings that should be fol
lowed by the user and the service technician to ensure safe operation
and repair in order to keep the instrument in a safe condition.

WARNING: Opening instrument covers or removing

parts, except those to which access can be gained
by hand, is likely to expose high voltages which
can cause death.

The instrument must be disconnected from all voltage sources before
it is opened. Remember that the capacitors inside the instrument re
tain their charge even if the instrument has been disconnected from
all voltage sources.

-

Grounding

This instrument is connected to ground via a sealed three-core power
cable, which must be plugged into socket outlets with protective
ground contacts. No other method of grounding is permitted for this
instrument.

WARNING: Any interruption of the protective ground

-

conductor inside or outside the instrument, or dis
connection of the protec- tive ground terminal, is
likely to make the instrument dangerous. Do not in
tentionally disrupt the protective grounding.

-

-

Disposal of Hazardous Materials

WARNING: Disposal of lithium batteries requires spe

cial attention. Do not expose the batteries to heat
or put them under extensive pressure. These mea
sures may cause the batteries to explode.

A lithium battery is used to power the nonvolatile RAM in this in
strument. Our world suffers from pollution, so don’t throw batteries
into your wastebasket. Return used batteries to your supplier or to the
Fluke representative in your country.

-

-

-

-

Line Voltage

The instrument can be powered by any voltage between 90 and
265 V
inal line voltages between 100 and 240 V.

n

Components that are important for the safety of this instrument may

-

only be replaced by components obtained from your local Fluke
representative. After exchange of the primary circuits, perform the
safety inspection and tests, as described in Chapter 5, “Repair”.

n

This instrument is protected by an ordinary 1.6 A slow blow fuse
mounted inside the instrument. NEVER replace this fuse without
first examining the Power Supply Unit.

without range switching. This makes it suitable for all nom

AC

Replacing Components in Primary Circuits

Fuses

-

1-2 Safety Instructions,

Chapter 2

Performance Check

General Information

Ω

WARNING: Before turning on the instrument, ensure

that it has been installed in accordance with the In
stallation Instructions outlined in Chapter 3 of the
Operators Manual.

This performance procedure is intended to:

Check the instrument’s specification.

–

Be used for incoming inspection to determine the acceptability

–

of newly purchased instruments and recently recalibrated in
struments.

Check the necessity of recalibration after the specified

–

recalibration intervals.

NOTE: The procedure does not check every facet of the in

strument’s calibration; rather, it is concerned primarily
with those parts of the instrument which are essential
for determining the function of the instrument.

It is not necessary to remove the cover of the instrument to perform
this procedure.

If the test is started less than 20 minutes after turning on the instru
ment, results may be out of specification, due to insufficient
warm-up time.

-

-

Preparations

Power up your instruments at least 20 minutes be
fore beginning the tests to let them reach normal
operating temperature. Failure to do so may result
in certain test steps not meeting equipment specifi
cations.

-

-

Front Panel Controls

Power-On Test

At power-on the counter performs an automatic self-test of the fol

-

-

lowing:

Microprocessor

–

–

RAM

ROM

–

Measuring circuits

–

Display

–

If a GPIB interface is installed, the GPIB address is displayed.

If there are any test failures, an error message is shown.

Turn on the counter and check that all segments light up on the

–

display and that no error message appears.

-

Recommended Test
Equipment

Type of instru

ment

LF Synthesizer Square;

Power Splitter 50 W PM9584/02
T-piece
Termination 50 W PM9585

Reference oscilla
tor

HF signal genera
tor

Pulse Generator 125 MHz
Oscilloscope with

probes
BNC cables 5 to 7 cables *

Table 2-1 Recommended Test Equipment.

*) Two of the cables must have 10 ns difference in delay, for ex

ample: 5 ns and 15 ns.

-

-

-

Required

Specifications

Sine up to 10 MHz

10 MHz ±0.1 Hz for
standard oscillator

10 MHz ±0.01 Hz for
PM9691 & PM9692

10 MHz ±0.0001 Hz
for PM6685R

0.5 GHz (no presc.)

3.3 GHz (option 10)

350 MHz

Suggested

Equipment

Fluke counter with
calibrated option

PM9691
Fluke PM6685R or

PM6681R
Fluke 910R or Ce

sium Standard

-

Fig. 2-1 Text on the display.

Internal Self-Tests

The different built-in test routines invoked by the power-on test can
also be activated from the front panel as follows:

Enter the Auxiliary Menu by pressing AUX MENU.

–

Select the test submenu by pressing DATA ENTRY up or

–

down.

Enter the test menu by pressing the ENTER key.

–

Selections for internal self-tests are:

1 TEST ALL (Test 2 to 5 in sequence)

2 TEST RO (ROM)
3 TEST RA (RAM)

4 TEST LOGIC (Measuring Logic)
5 TEST DISP (Display Test)

Use DATA ENTRY up/down to select TEST ALL, then press

–

ENTER.

If any fault is detected, an error message appears on the dis

–

play and the program halts.

If no faults are detected, the program returns to measuring

-

–

mode.

-

2-2 Performance Check, General Information

Keyboard Test

The keyboard test verifies that the counter responds when you press
any key. To check the function behind the keys, see the tests further
on in this chapter.

Press the keys as described in the left column and look on the display
for the text, as described in the second column. Some keys change
more text on the display than described here. The display text men
tioned here is the text mainly associated with the selected key.

Key(s) Display Note Pass

STAND-BY Display Off Red LED

ON Backlight on

PRESET

ENTER

EXT REF EXT REF

Input A

FILTER FILTER

50 W

(2 times)

SENS 
(2 times)

SENS 
(2 times)

AUTO AUTO TRIG

PRESET

ENTER

MEAS TIME 200
DATA ENTRY  500
DATA ENTRY  200

ENTER NO SIGNAL

DISPLAY HOLD HOLD

DISPLAY HOLD

SINGLE SINGLE

FUNCTION  DUTY F A
FUNCTION  TOT A MAN

FUNCTION  DUTY F A
FUNCTION  FREQ A

AUX MENU RECALL

MEAS RESTART NO SIGNAL

PRESET

ENTER

CHECK 10.00000000

NULL NULL
NULL 10.00000000

BLANK DIGITS

(3 times)

MENU Displays all avail

DEFAULT?

NO SIGNAL

50 W

Bar graph:

zzzzzzzz

Bar graph:

zzzzzzzzzz

Other

DEFAULT?

NO SIGNAL

DEFAULT?

NO SIGNAL

10.00000___

able functions, pro

cesses and input

controls. Selected

items are blinking.

–3

s

–3

s

–3

s

6

Hz* Start

6

Hz*

6

Hz*

counting

-

-

Table 2-2 Keyboard Test.

beside

the key

On

Default

setting

Default

setting

Default

setting

/Fail

NOTE: For the instrument to respond correctly, this test must

be carried out in sequence and you must start with the
preset (power-on) setting.

* The LSD may vary.
** MENU is not disabled by setting DEFAULT; press menu again.

-

Short Form Specification
Test

Sensitivity and Frequency Range

Press the PRESET key to set the counter in the default setting.

–

Then confirm by pressing ENTER.

Turn off AUTO.

–

Select IMP A = 50 W and maximum sensitivity.

–

Connect a signal from a HF generator to a BNC power splitter.

–

Connect the power splitter to your counter and an oscilloscope.

–

Set input impedance to 50 W on the oscilloscope.

–

Adjust the amplitude according to the following table. Read

–

the level on the oscilloscope. The counter should display the
correct frequency.

Frequency Level Pass/Fail

MHz mV

1 30 10 –27

25 30 10 –27

50 30 10 –27
150 60 20 –21
200 90 30 –17
250 150 50 -13

300 150 50 -13

PP

mV

RMS

Table 2-3 Sensitivity of input A at various frequencies.

Reference Oscillators

X-tal oscillators are affected by a number of external conditions,
such as ambient temperature and supply voltage, but they are also af
fected by aging. Therefore, it is hard to give limits for the allowed
frequency deviation. You must decide the limits depending on your
application, and recalibrate the oscillator accordingly. See the Pre
ventive Maintenance in the Repair chapter, Chapter 5.

Oscillator Max. tempera

Standard ±100 Hz ±5 Hz ±50 Hz

PM9691 ±0.05 Hz ±0.1 Hz ±0.75 Hz

PM9692 ±0.025 Hz ±0.03 Hz ±0.2

Rubidium ±0.003 Hz ±0.0005 Hz ±0.002 Hz

ture dependence

Table 2-4 Deviation (for PM9691 and PM9692 after a

warm-up period of 48 hours).

To check the accuracy of the oscillator you must have a calibrated
reference signal that is at least five times as stable as the oscillator
that you are testing, see the following table.

Press the PRESET key, then press the ENTER key to set your

–

counter in the Default setting.

-

dBm Input A

Max. aging

per month

-

-

Max. aging

per year

Performance Check, Short Form Specification Test 2-3

Connect the reference to input A.

–

Check the readout against the accuracy requirements of your

–

application.

Acceptance Test

n

As an acceptance test, the following table gives a worst case figure
after a 30 minute warm up time. All deviations that can occur in a
year are added together.

Oscillator Frequency readout Suitable refer

Standard 10.00000000 MHz

±120 Hz

PM9691 10.00000000 MHz

±1 Hz PM6685R

PM9692 10.00000000 MHz

±0.25 Hz

ence

PM9691

PM6681R

Pass

­/Fail

Table 2-5 Acceptance test for oscillators.

Acceptance Test, PM6685R

n

To fully test the accuracy of the PM6685R, a reference signal of ex
tremely high stability is needed. Examples of such references are
Cesium Atomic references, or transmitted signals from a nationally
or internationally traceable source, like the GPS satellites.

EXT ARM INPUT

Press the PRESET key, then press the ENTER key to set your

–

counter in the Default setting.

Select 50 W input impedance.

–

Apply 10 MHz 500 mV

–

–

The counter measures and displays 10 MHz.

Press the AUX MENU key.

–

Press the DATA ENTRY UP/DOWN keys until the display

–

shows ‘Ar. Start’, confirm by pressing the ENTER key.

Press DATA ENTRY UP/DOWN keys until the display shows

–

‘POS’, confirm by pressing the ENTER key.

Press the ENTER key once more.

–

The counter does not measure.

–

Connect a pulse generator to Ext Arm input.

–

Settings for pulse generator: single shot pulse, amplitude TTL

–

=0-2V

Apply one single pulse to Ext Arm input.

–

-

The counter measures once and shows 10 MHz on the display.

–

, and duration = 10 ns.

PP

, (1.4 VPP) sine to input A

RMS

Recommended Test Equipment

Type Stability Model

10 MHz refer

ence

-

£ 1x10

-10

910R with satellite contact dur

ing the last 72 hours.

Test Procedure

Connect the counter to the line power.

–

Check that the UNLOCK indicator turns on, and then turns off

–

again within 6 minutes after connecting line power.

Connect the 10 MHz reference signal to input A of the counter.

–

Select FREQUENCY A measurement.

–

Select 2 s measuring time.

–

Check that the displayed frequency is 10.00000000 MHz

–

±0.05 Hz £ 10 minutes after connection to line power.

Rear Input/Output

INT REF Output

Connect an oscilloscope to the 10 MHz output on the rear of

–

the counter. Use coaxial cable and 50 W termination.

The output voltage is sinusoidal and should be above 2.8 VPP.

–

EXT REF Input

Press the PRESET key, then press the ENTER key to set your

–

counter in the Default setting.

Apply 10 MHz sine to input A equipped with a T-piece and to

–

Ext Ref input at the rear, terminated with 50 W. Amplitude on
10 MHz signal; 200 mV

–

Press the Ext Ref key.

The display should show 10.000000006Hz ± 5 LSD.

–

, (560 mVPP)

RMS

Measuring Functions

-

Preparation for Check of Measuring Function is as follows:

Connect a 10 MHz sine wave signal with 2.0 VPPamplitude

–

via a T-piece to Input A.

Connect a cable from the T-piece to Input E (Ext Arm) at the

–

rear.

Select the measuring function as in the ‘Selected Function’ col

–

umn and check that the counter performs the correct measure
ment by displaying the result as shown under the “Display”
column in the following table.

Selected Function Display Pass/ Fail

PRESET

ENTER

IMPA50W 10 MHz

Non AUTO 10 MHz

PER A 100 ns

RATIO A/E 1.0000000
PWIDTH A 50 ns

TOT A MAN

DISPLAY HOLD Start counting
DISPLAY HOLD Stop counting

DUTY FACT 0.500000

AUTO 0.500000

DEFAULT?

10 MHz

2)

1)

2)

2)

2)

1)

1)

Table 2-6 Measuring functions check.

1) Value depends on the symmetry of the signal.

2) Exact value depends on the input signal.

-

-

2-4 Performance Check, Rear Input/Output

Options

Prescaler

This extra HF input (PM9624) is easily recognized by its front panel
connector (Input C, type N).

EX T
REF

Fig 2-2 Connect the output of the signal generator to the HF

Required Test Equipment Suggested Specification

HF signal generator 3.3 GHz

Table 2-8 Test equipment for 3.0 GHz HF input.

Connect the output of the signal generator to the HF input of

–

the counter.

Connect the 10 MHz REFERENCE OUT of the generator to

–

the REFERENCE IN at the rear panel of the counter.

Setting for the counter after Preset.

Function = FREQ C.

–

EXT REF.

–

Generate a sine wave in accordance with the following table.

Verify that the counter counts correctly. (The last digit will be

–

unstable).

Table 2-7 Sensitivity of the PM9624 HF input.

input of the counter.

Frequency Amplitude Pass/Fail

MHz mV

100-300 20 –21

-2500 10 –27

-2700 20 –21

-3000 100 –7

RMS

dBm

Performance Check, Options 2-5

This page is intentionally left blank.

2-6 Performance Check, Options

Chapter 3

Disassembly

The terms in the following figure are used in all descriptions in this
manual.

To p

Left

Front Bottom

Fig. 3-1 Designations used in this manual.

The PM6685 is available with a number of options and accessories.
The labels on the rear panel of the counter identify the options and
accessories included. If there are no labels, the counter contains an
uncompensated crystal oscillator and no options. The following la
bels exist:

PM9624 3.0 GHz HF input

–

PM9691 High-Stability Oven Oscillator

–

PM9692 Ultra-High-Stability Oven Oscillator

–

PM9626B GPIB Interface

–

The location of these optional parts is illustrated in Fig.3-2.

GPIB interface

Power
Module

G1

Optional
oscillator

Rear

Right

Removing the Cover

WARNING: Do not perform any internal service or ad

justment of this instrument unless you are qualified
to do so.

WARNING: When you remove the cover you will ex

pose high voltage parts and accessible terminals
which can cause death.

WARNING: Although the power switch is in the off

position, line voltage is present on the printed cir
cuit board. Use extreme caution.

WARNING: Capacitors inside the instrument can hold

their charge even if the instrument has been sepa
rated from all voltage sources.

–

Make sure the power cord is disconnected from the counter.

Turn the counter upside down.

-

–

Loosen the two screws (A) at the bottom and the two screws

–

(B) in the rear feet.

Grip the front panel and gently push at the rear.

–

Pull the counter out of the cover.

–

A

Fig. 3-3 Remove the screws and push the counter out of

the cover.

A

B

B

-

-

-

-

HF input

Main board

Front panel

Fig. 3-2 Location of the boards in the counter.

Reinstalling the Cover

Gently push the counter back into the cover.

–

Turn it upside down.

–

Install the two screws (A) at the bottom.

–

Install the two rear feet with the screws (B) to the rear panel.

–

PM9624 (HF Input)

Disconnect the power cable.

–

Remove the cover from the counter.

–

Disconnect the cable from the mini-coax connector (A) on the

–

HF input.

Press the clips (B) apart and lift the HF input pca straight up

–

and out.

3-2 Disassembly, Removing the Cover

When installing the HF input, make sure that the connector

–

pins fit exactly in the holes in the connector housing (C).

A

B

C

B

PM9691 or PM9692 (Oven
Oscillator)

Disconnect the power cable.

–

Remove the cover of the counter.

–

Remove the two screws (A) holding the oscillator to the main

–

pca from underneath.

Press the clip (B) gently to the front of the counter and lift the

–

oscillator straight up.

Make sure that jumpers J14 and J15 are set in the correct posi

–

tion.

When fitting the oscillator, make sure that the connector pins

–

fit exactly in the holes in the connector housing.

A

-

Fig. 3-6 Removing the HF Input.

PM9626 (GPIB Interface)

Disconnect the power cable.

–

–

Remove the cover from the counter.

Loosen the two screws (A) holding the GPIB interface to the

–

rear panel.

Disconnect the interface cable from P103.

–

Move the GPIB interface pca toward the front of the counter

–

and lift the pca supports out from the “keyholes” (B) on the
main PCA.

A

B

B

Fig. 3-5 One of the two screws holding the oven oscillator

in place.

A

Fig. 3-4 Loosen the two screws in the rear panel and dis

engage the board from the keyholes.

-

Disassembly, PM9626 (GPIB Interface) 3-3

This page is intentionally left blank.

3-4 Disassembly, PM9691 or PM9692 (Oven Oscillator)

Chapter 4

Circuit Descriptions

Block Diagram Description

General

The PM6685 Frequency Counter consists of three main units:

Front unit

–

Main board unit

–

Rear panel unit

–

The following options can be added:

GPIB interface including analog output (PM9626B)

–

–

Prescalers 1.3 GHz (PM9621), 3.0 GHz (PM9624)

Oven-controlled crystal oscillators (PM9691 or PM9692)

–

Rack mount adapter (PM9622/02)

–

Battery option (PM9623)

–

The chassis of the counter consists of a front piece molded in alumi
num, an aluminum rear panel, and two profiled aluminum rods that
hold the front and rear panels together. This unit can be slid into the
aluminum cover of the instrument.

The front unit contains all functions needed for the user communica
tion. It is connected to the main board unit with a flat cable, and the

molded front unit is fixed to the two profiled aluminum rods with
screws.

The main board unit consists of a PCB mounted on two profiled alu
minum rods. Most functions, such as the following, are placed on the
main board:

Input amplifiers with trigger level circuits

–

Power supply

–

–

Measurement logic

Microcomputer circuitry

–

Some outputs, such as the trigger levels and probe compensation
view outputs are directly mounted on the main board.

The rear panel unit is of aluminum with a number of mounted con

-

-

nectors. Most of the connectors are soldered directly to the main
board. The rear panel is fixed to the two profiled aluminum rods with
screws.

-

-

4-2 Block Diagram Description

Optional oscillator

A

X2
EXTC

INTREF

10 MHz out

G

B2

E

External arming

÷2

EXTREF
A

A2

C

HF input

GET

D

A

External reference

Input Amplifier

U29

Counter

ASIC

Micro-

computer

Trigger DAC´s

Local preset

Reset circuit

HSI.0

RESET

U11

2

IC

PWM

Gate LED

Display

Analog output

Option 80

Power supply

C

90-265 V

+5V
+12V

GPIB option

+7V

-5.2V

Keyboard

Fig. 4-1 PM6685 block diagram.

Block Diagram Description 4-3

Hardware Functional Description

Front Unit

LCD Drivers

U201
Driver 1

SCL

SDA

PC F8 576

Sync.

U2 02
Driver 2
PC F8576

Fig. 4-2 Front panel LCD drivers.

An LCD and two LEDs are used as indicators. The LCD is used to
show both the measurement result and the state indicators of the in
strument setting. The LEDs show standby and gating.

The LCD has 158 segments that are multiplexed with a ratio of 2:1.
Two parallel and synchronized LCD drivers (U201 and U202) are
used. They are connected with a serial I
on the main board. The clock frequency of the drivers is approxi
mately 140 kHz, set by R201. The VLCD pin is connected to GND
on the main board.

The LCD is provided with a backlight, an LED array integrated into
one component. Its current consumption is set by the resistors
R204-R207. The backlight dissipates approximately 1.5 W .

Backpl. 0

Backpl. 1

LC D

1 58 segment s

2:1 Multiplex

2

C bus to the microcomputer

Keyboard

Main Board

U11

AD0-AD7 H0-H3

CPU

HS1.0

P1.1

P1.0

-

Fig. 3 Keyboard scanning.

-

The front panel pushbuttons are connected in a matrix. The scanning
signals H0 to H3 come from the main board. If a push button is
pressed and H0 to H3 is high, one of the output signals V0 to V7 will
be high. The STAND-BY/ON and LOCAL-PRESET buttons are not
part of the scanning but are connected directly to the main board.

The front unit is fixed to the main board unit with three screws. The
electrical connection is made with a 40-lead flat cable to the main
board.

U13A

Latch

U14A

Latch

AD0-AD7

Keyboard & Display

Board

V0-V7

LOCAL/PRESET

SCL
SDA

4-4 Hardware Functional Description

Main Board

Introduction

Components not necessary for explaining the function are omitted
from the figures in this chapter. For the complete set of components,
see the circuit diagrams in Chapter 8, Drawings and Diagrams.

Input Amplifier

The input amplifier has 300 MHz bandwidth and is of the split-band
type. It contains four main stages: the signal adaptation stage, the im
pedance converter stage, the comparator stage, and the buffer stage.

Signal Adaptation

n

This part of the amplifier contains:

50 W/1 MW impedance selector

–

x1/x11 attenuator

–

Voltage limiter

–

50 W /1MW Impedance Selector

K2

C2

R6

J1

R1

K1

R7-R17

C1

R2 R3-R5

R22-R23

R18

K3

R19­R20

R24­R26

C3

To Voltage
li mi te r

R27­R28

selected if the relay is open. Depending on selected attenuation, the
1MW input impedance is determined by different combinations of
resistors.

In x1 attenuation mode (K2 is closed and K3 is open) the impedance
is determined by resistor network R22 to R28.

In x11 attenuation mode (K2 is open and K3 is closed) the same net

­work as in the x1 case is involved plus the resistors R3 to R5 and R18
to R20.

The input capacitance in parallel with 1 MW is 24 pF at x1 attenua

-

tion and 12 pF at x11 attenuation.

-

The series resistor R1 immediately after the selector serves both as
current limiter together with the voltage limiter (see below) and as
impedance matching resistor. The resistor also improves the Volt

­age-Standing-Wave-Ratio (VSWR) of the amplifier input.

x1/x11 Attenuator

The x1 attenuator consists of a resistive low-frequency divider,
which reduces the input signal by a factor of 2, and a capacitive
high-frequency divider. The attenuator is formed by the resistors
R22-R23 andR24-R26 in parallel with R27-R28. The capacitive part
is formed by the variable capacitor C2 in parallel with R22-R23, and
the parasitic capacitance across R24-R26.

The capacitive attenuator is adjusted via variable capacitor C2 to the
same attenuation value as the resistive attenuator.

The x11 attenuator also consists of a resistive low-frequency divider
and a capacitive high-frequency divider. The resistive part is formed
by R1-R5, and R18-R20 in parallel with 1 MW (the x1 attenuator im
pedance). The capacitive divider is formed by the variable capacitor
C1 and the parasitic capacitance at the node where R5, R18 and R22
meet.

-

Fig. 4-4 Impedance selector and 1X/11X attenuator.

The 50 Wor1MW impedance modes are selected by relay K1. 50 W
is selected via the resistors R7 to R17, if the relay is closed. 1 MW is

Input A

Imp. Att. Limiter

Imp.

Conv.

Trigger
level Comp I

Trigger
level Comp II

Resistors R2 and R6 improve the frequency response.

LP

filter

Comp-

arator

Flip­Flop

Comp-

arator

÷2

Buffer

Buffer

A

A2

Fig. 4-5 Input amplifier block diagram.

Hardware Functional Description 4-5

Voltage limiter

p

+5

and D3 to clamp positive voltage and resistor R36 plus the diodes D2
and D4 to clamp negative voltage. The clamp voltage is approxi
mately ±2.1 V for low frequency signals. At high frequency the
clamp voltage rises to approximately ±2.3 V.

-

R35

D3D1

From
Attenuator

D2

R36

-

To Impedance
converter stage

D4

Fig. 4-6 Voltage limiter.

A voltage limiter that protects the impedance converter against
overvoltage is placed between the attenuator and the impedance con
verter. The voltage limiter consists of resistor R35 and the diodes D1

Impedance Converter Stage

n

The analog signal from the input stage is fed to an amplifier stage
where split-band technique is used to get good frequency response
over a wide range. This means that the high-frequency contents of
the signal are fed to a high-impedance AC-coupled FET transistor
stage Q1. The low-frequency contents are fed to a DC-coupled oper

­ational amplifier stage with negative feedback from the output of the
converter stage buffer. The low-frequency path handles frequencies
up to approximately 5 kHz.

The high-frequency signal is fed to the gate of Q1. The high imped

­ance at the gate is converted to a low impedance at the source. The
source is connected to the base of HF transistor Q2, the summing
point for the two signal paths.

To make the FET work well in its active region within the whole dy

­namic range, the FET drain is supplied with +7 V via resistor R42.

The low-frequency signal is divided by the two resistors R27 and
R28 before it is coupled to the input pin #2 of the operational ampli
fier U1. The resistors R37 and R38 at the operational amplifier out

-

­put pin #6 center the output swing, and capacitor C6 stabilizes the
operational amplifier stage.

-

The low-frequency path goes from the operational amplifier to the
base of transistor Q3, the collector of which is connected to the base

Fr om Pr o t ec t io n
ci rcu its

R27

R28

R32

C13

R33

R29­R30

R31

C5

+7 +5

R42 R43

Q1

-5.2

R37

R38

-5.2 -5.2 -5.2 -5.2 -5.2

Q3

C6

+5

Q2

R105

R46

R47

Q13

C20

R50

K4

L1

C18-

Q4U1

C19

K4

R106

U8

To

+

-

+

-

Flip-Flo

Trig
Level

Fig. 4-7 Impedance converter.

4-6 Hardware Functional Description

of transistor Q2. This point is common to the high and low frequency
paths.

A buffer amplifier with high driving capacity is used to get a linear
output in the 100 W load resistor R106 over a swing of 2 V. This am
plifier consists of a driver stage Q2, an output stage Q13, and a cur
rent generator Q4.

From the output of this second amplifier stage, the signal is fed back
to theop amppin 3via thedivider chainR29 toR32. Thetrimmer po
tentiometer R31 sets the gain of the low-frequency path equal to the
high-frequency gain of about 0.9. Capacitor C5 is connected to oper
ational amplifier pins #1 and #8 to achieve stable operation. The
trimmer potentiometer R33 between pins #1 and #5 on the opera
tional amplifier is used for adjusting the offset voltage of the opera
tional amplifier.

The channel A filter connected to the output of the second amplifier
stage isa 100kHz low-pass LC filter. It consists of the coil L1 and the
two capacitors C18 and C19 in parallel. The filter is controlled by the
relay K4. The filter output is connected to the input of the comparator
stage.

Comparator Stage

n

The comparator stage converts the analog signal from the impedance
converter stage to a square wave. This circuit consists mainly of the
high-speed integrated comparators U8A and U8B plus a separate
trigger level circuit connected to the comparators at pins 9 and 13 via
resistors R87 and R88.

The trigger level circuits, which are described later, generate a DC
level in the range of approximately æ1.6 V. This covers a dynamic
range of 6.4 V since the input signal is divided by a factor of 2 before

-

-

-

-

-

-

it reaches the comparator.

The counter is provided with adjustable hysteresis, i.e., it is control
lable via the front panel or GPIB. The circuitry for setting the hyster
esis consists of the resistor network R91 to R96, supplied with +5 V
and –5.2 V. It is connected to the latch enable inputs of the compara
tor, pin 5 and 7 for Comparator I and pin 17 and 15 for Comparator II.

The input signal is fed to both comparators, the outputs of which are
used for setting/resetting the Flip-Flop U9.

Buffer Stage

n

Before the signal is fed further into the ASIC U29, it has to be
level-shifted by a buffer stage. The negative ECL logic levels
(~ –0.9 V to ~ –1.7 V) from U9 pins 17 and 18, are converted to a

single-ended signal with CMOS logic levels ( ~ 5 V to~0V).

The buffer is a differential amplifier consisting of the two transistors
Q32 and Q33 whose bases are fed differentially from the two com
parator outputs. Resistor R304 serves as a current generator that is
switched alternately to the two collector resistors R296 and R297.

-

-

-

-

Trigger Level Circuits

The trigger level circuits generate the trigger voltage levels to the in
put comparators. The trigger level range is –3.2 V to + 3.2 V with a
maximum resolution of 0.6 mV. The input amplifier attenuation is

-

TP27 TP26

Trig ger Level I

Input signal

Tri gger Level II

+5

B
A

R92

C

D

R93

E

R91

F

R94

R96

-5.2

R87

B

A

G

U8A

+

-

U8B

+5

R296

U9

D

Flip ­Flop

E

U9

Q32

F

R297

Q33

F

To
Counter
circuits

G

R88

C

+

-

R304

Fig. 4-8 Comparator flip-flop and buffer stages.

-5.2

Hardware Functional Description 4-7

approximately 2 times. The trigger level circuits generate a DC level
that has the same attenuation. This means that the output of this cir
cuit has a range of –1.6 V to +1.6 V with a resolution of maximum

0.3 mV. Adual 8-bit DAC is used. The DACs only generate voltages
between 0 and +1.6 V, but by using a X2 amplifier and an offset shift
of 50%,the voltagerange of –1.6 Vto +1.6V is achieved. The supply
voltages to the trigger level circuits are filtered by R and C to prevent
noise originating in the digital circuitry from influencing the trigger
levels. The ground plane under the trigger level circuits is separated
from the rest of the ground plane, and the planes are connected only
at the front of the counter.

The trigger level circuits consist of the following:

­Resistor network R57 to R68 for generating the reference volt

–

-

ages 0.04 V, 0.22 V, 0.59 V, and 1.6 V.

Three multiplexers (U3) to select one of the levels. With this

–

arrangement there is a total trigger level range of
–1.6 V to +1.6 V.

A double DAC (U4).

–

Two current-to-voltage converters U6. These circuits convert

–

the current at the IOUT pins of the DACs to a voltage. This
signal has a range of 0 V to approximately 1.6 V.

Two amplifiers, U7, with an amplification of X2, to generate a

–

signal with a range of 0 V to 3.2 V. Resistors R69 and R70 set
the reference voltage to the amplifier to get the 50 % offset
shift. To get exact voltages, 0.5 % precision resistors are used:
R73-R75, R78-R79 and R80-R82, R85-R86.

The zero adjust of the trigger levels is done with trimmer po

–

-

tentiometers R69 and R70 connected to the amplifiers in U7.

Two low-pass filters R87-C29 and R88-C30.

–

AD0-AD2

1.6V

0 .59V
0 .22V
0 .04V

U3

AD0- A D8

U4

D0- D7
+DACA

VREFR FB

IOUT

VREFR FB

IOUT

U6

U6

R73-R74

R75

R69

R80-R81

R82

R70

+5

-5.2

+5

-5.2

Trig ger lev el Comp I

R78-R79

U7

R87

C29

Trig ger l evel

Comp II

R85-R86

U7

R88

C30

Compar ator I

Comparator II

Fig. 4-9 Trigger level circuits.

4-8 Hardware Functional Description

Power Supply

General survey

n

The power supply generates four regulated DC supply voltages to the
counter, as well as some other supply voltages for special purposes.
The power supply block also contains the ON/STANDBY logic.

The main building block of the power supply is a primary switch
mode power module (U39). The line power AC voltage (90 V to
265 V) is rectified to a DC voltage before it is fed to the power mod
ule.

After a line power filter in the power inlet, a fuse of 1.6 AT and an
NTC resistor protect the power supply. The fuse F1 should only blow
if a catastrophic error occurs on the primary side of the power supply.
A short-circuit on the secondary side should not affect the primary
side. To minimize the inrush current to the capacitors at the connec
tion of the power cord, an NTC resistor (R148) is used. The resis

tance is 15 Wwhen the resistor is cold but decreases to a few ohms as
it is warmed up by the steady-state current.

The AC voltage is rectified in the bridge rectifier D9 and filtered in
C64. C65 suppresses noise from D9. L6 and C82-C83 serve as a fil
ter at the input of U39.

All inputs and outputs of the power module have HF chokes. The
module is mounted with distance washers on the main board.

-

-

-

From the module there are three DC voltages outputs. One of those is
regulated (+ 5 V) and the others are unregulated. These voltages will
vary with input line voltage, the current at+5V,andattheunregu
lated voltages. The output marked +15 will be approximately +18 V,
and the output marked –7 will be approximately –8 V. The outputs
are filtered; HF is filtered by C70-C73, and LF is filtered by L7-L9
and C74-C76.

-

-

On

Stand by

ains Inlet
M

D9

Filter&Fuse

U42

U

U40B

U39

R156

-7

+5

+15

Power Module

Q14

U43

U

R149-R155

U

U41

J15

K5

R130-R145

K5

U

U21A&Q17

+12 V*

-5.2 V

+5 V

Q5-Q6

+12 V

+7 V

Fan

PM6685R

only

Fig. 4-10 Power Supply.

J31

+-

*) for ON/STBY control & OCXO

Hardware Functional Description 4-9

Function

n

The three DC voltages from the power module are used for
generating the following four supply voltages in the counter:

+5 V

Regulated +5 V from the power module is used directly.

–5.2 V

–7 V is used, with regulator U43.

+12 V

+15 V is used, with regulator U41.

+7 V

Stabilized +12 V is used, with regulator U21A and Q17.

temperature sensor, controls the speed by applying a variable refer
ence voltage to the fan voltage regulator U42.

Counter ASIC

The main part of the counting logic is integrated in a CMOS ASIC
specially designedfor theFluke MultiFunctionCounter series.There
are also analog blocks included in the 100 pin QPF package.

MUX

The MUX block is a switchboard for incoming and internal signals
involved in the measuring process. Some signals are divided by 2 to
make it possible to measure higher frequencies. The trigger slope is
controlled by the MUX block as well. Atrigger edge detector senses
the presence or absence of comparator pulses and controls the trigger
level DAC’s in the TLDAC block. These functional units form an es
sential part of the Auto Trigger System.

-

-

The following supply voltage is used for a special purpose:

+12 V*

This voltage comes directly from the +12 V regulator U41and will be
present as soon as the power cord is connected, regardless of the po
sition ofthe ON/STANDBY switch. It is used for the ON/STANDBY
control logic and for supplying an optional OCXO in STANDBY to
avoid the long warm-up time otherwise needed to obtain maximum
accuracy.

At stand-by, the four main supply voltages are switched off, but as
described above, some parts of the instrument should not be
diconnected. Therefore the power module will never be switched off.
The PM6685 has consequently only a secondary power switch.

A relay (K5) disconnects the load on the +5 V and –5.2 V at stand-by.
Because the power module must always have a load on the regulated
voltage, seven bleeder resistors R149-R155 are always connected to
+5 V via J15. At stand-by the counter only needs +15 V, so a dummy
load consisting of R130-R145 is connected to the power module by
means of the relay K5 in order to stabilize the operation of the
switchmode converter.

+5 V controls the switching on/off of +12 V and +7 V. When +5 V is
on, Q6 and Q5 will conduct, i.e. +12 V will be on. If there is no +5 V,
Q6 and Q5 will be off, thus blocking the +12 V.

The ON/STANDBY logic controls relay K5, which operates as de
scribed above. It is also possible to open the relay by changing the
position of J16.

The ON/STANDBY logic consists of the RS (set-reset) flip-flop
U40B that is controlled by the ON/STANDBY button on the front
panel. Pressing STANDBY will apply a high voltage (+12 V) to the
set input. The inverting output of the flip-flop will be low, discon
necting K5 via Q14. Pressing ON will give a high voltage (+12 V) on
the reset input. The inverting output of the flip-flop will be high,
engaging K5. Inserting the power cord into the power inlet will cause
a pulse on the reset input, via C35. The microcomputer can disable
the ON/STAND-BY button via Q12 and Q7. This is done in remote
mode and during RAM-testing. A high level on the base of Q12 en
ables STAND-BY, a low level disables it.

The STAND-BY indicator on the front panel is controlled by the
+5 V via Q16. +5 V off lights the STAND-BY LED that is fed by the
uninterruptible +12 V*.

+5 V also indirectly controls the fan in the PM6685R. It is a 12 V DC
fan that operates only if +12 V is on. An NTC resistor, serving as a

OSC

The oscillator block generates, selects, and distributes the reference
clock for the circuit. The active semiconductors of the standard oscil

-

lator are included in this block. The crystal is connected to pins X1
and X2. A TCXO or OCXO is connected to X2 only. An external ref
erence clock is connected to EXTREF. The PWM signal generated at
OTRIM controls the frequency of the reference oscillator after exter
nal integration.

-

-

-

PG

A built-in pulse generator having the 10 MHz clock as a reference
can generate pulses with controllable duration and repetition rate at
the OUTPUT connector. The level is fixed TTL.

RTC

A real time clock not used at present.

TLDAC

This block contains two 10-bit DAC’s generating the trigger levels
for the input comparators, VOUTA for channel A and VOUTB for
channel B. An external reference voltage is connected to V+REFA
and V+REFB.

HO

The Hold Off block can manipulate the internal measuring signal X

-

-

-

in several ways. One operating mode simulates a low pass filter (nor
mal hold off), another mode is used in burst measurements.

The following blocks (SYNC, STST, CNTS and MCTRL) form the
actual measuring logic in the ASIC. Three types of measurements
can be made in this MEAS block:

Continuous measurements (frequency, ratio and period average).
Not used at present.

Controlled measurements (time interval, period single, pulse width,
frequency, totalize gated, totalize start-stop, and ratio).

Totalize manual.

SYNC

The SYNC block synchronizes the actual measurement with certain
internal or external events like measuring time and arming signals.

-

STST

The start and/or the stop of the measurements are controlled by this
block. External events can be used to define the exact moments.

4-10 Hardware Functional Description

EXTC

BURST

TRA
TRB

VCCO
GNDD1
GNDD2
GNDD3
GNDD4

GET

SB
SA

OKD

CLOCK

RE S ET

Inter-

polator

FNb

FNa

I

I

CY 1
CY 2

VC CG
GNDG
VR EFA D

IR ES
IN TP1
IN TP2

IN TS1

OK a

OKb

IN TS2

A2

A

SR

B

B2

P

MUX HO SYNC CNTS

X
Y

HODLYX
HODLYY

CL O C K

S TAAR M
STO ARM

STAD LY

STO DL Y

TI ME
MREF
FREQC
MCLK
PGARM

PCL

PGT RIG

X
Y

HODLYX
HODLYY

HO S X
HO S Y

XH
YH

XH
YH

CLOCK
ST O P

ST AR T

HO S X
HO S Y

STA AR M
STO A RM

STA DLY
STO DL Y
GET
TOTSTA
STA

TOTSTA

GATEO

STOP

STAR T

STST

STA

R1
R2

L1
L2

R1
R2
L1
L2

I

INTB
INTA

NB

FND

F

OKA

FNC

OKB

FNA

I

OK C

I

I

X1
X2

V+R EFO

OTRIM

V- REF O

EXTREF

MTC XO
IN TR EF

OUTMUX

MPCL K

PH1

PH2
VCCB
GNDB
VCCC

GNDC

GNDA
VCCA
VCCX +5

OSC

RTC

+5

PGOUT

TI ME

MREF

FREQC

MCL K

PGR EF

PG

PGR EF

PGT RIG

PGA RM

PGOUT

PG

Fig. 4-11 Counter ASIC, block diagram.

CNTS

Two 32-bit binary counters count external events or keep track of the
time.

Interpolator

This block is not used at present.

MCTRL

The different events in the measurement cycle of the ASIC are timed
by this block.

MPI

This is the microprocessor interface block. The bus width is 16 bits,
AD0 toAD15. Interruptsto themicroprocessor are generated at INT.

GET

The GET signal from an optional GPIB interface can control the start
of a measurement.

External Interpolator

n

The X-POLATOR unit is connected directly to the internal
interpolator in the ASIC. It is used for increasing the time resolution
beyond the limits set by the reference clock period of 100 ns. An er
ror pulse is generated in the SYNC block. Its width is determined by
the difference between an external event on an input channel and the
next clock pulse. This pulse controls a current generator charging a
capacitor. When the pulse has expired the voltage across the capaci
tor is A/D converted and the value is added to the result. There are
two interpolators, one for the start event and one for the stop event.

RTC

RTC

RTCX1

-

-

MCTRL

FI N1

DMAR

TLDAC

DMABR

CS RS SS

PCL

OK

MCL K

MPI

C1

C3

CS

A16

A18

ALE

VBAT

RTCX2

LARMN

RDN

AD0-AD15

A17

WR L N

WRHN

INT

A19

S1N

HO L D N

S2N

HLDAN

QDM AN

C2

S4N

S5N

S3N

FIN
MTIM E

V+R EFA
VOU TA
V- REF A
V+R EFB
VOU TB
V- REF B
VC CE
GNDE

VC CF
GNDF

C4

They are calibrated over the possible error pulse range to allow for
any aberrations from the theoretical linear behavior.

Oscillator Circuits

CPU Oscillator

n

The microcontroller U11 is clocked at 12 MHz. The crystal B1 is
connected to the XTAL inputs of the microcontroller.

n

Reference Oscillators

A 10 MHz crystal oscillator is used as the reference for the measur
ing logic. If a stable external 10 MHz reference is available, it can be
connected to REF IN on the rear panel and selected by means of the
EXT REF button on the front panel.

In addition to the standard crystal oscillator there are two optional
oven-controlled crystal oscillators (OCXO) to choose from.

Standard

The uncompensated standard oscillator consists of the crystal B2,
C109, C113-C115, R209 and R211. C115 is used for manual adjust
ment of the frequency when the calibration tolerance has been ex
ceeded. Theactive circuitryis builtinto theASIC U29and is accessi
ble via the pins marked X1 and X2.

OCXO

If one of the OCXOs is mounted, the standard oscillator has to be in
activated by moving the jumpers J23 and J25 to their alternative po
sition. These oscillators are connected to J24 and are self-contained

-

-

-

-

-

-

Hardware Functional Description 4-11

units with facilities for coarse and fine adjustment. They are fixed to
the main PCB with two screws. The output signal is AC-coupled to
the X2 pin on U29 via C107.

External

This input consists of an AC-coupled line receiver with Schmitt trig
ger function (U28) and is protected against excessive voltage
excursions by a resistor-diode network. The output signal from U28
has CMOS logic levels and is connected to the EXTREF pin on the
counter ASIC U29.

Logic

Microcomputer Circuits

n

Microcontroller

The microcomputer circuitry consists mainly of the microcontroller
U11, an Intel 16-bit CMOS 80C196, RAM (U22A), and EPROM
(U23A). The microcontroller is clocked at 12MHz. The data and ad
dress lines AD0 to AD15 are shared by means of multiplexing.
Therefore the addresses are stored in the latches U16A and U17A.
The ALE signal (Address Latch Enable) enables the latches.

UVEPROM

The main program is stored in U23A that is mounted in an IC socket,
making it easy to update and customize the instrument firmware by
changing the EPROM.

EEPROM

Front panel settings, GPIB address and certain other data that are not
changed frequently, e.g. information in the Protected User Data
Area, are stored in U12A which does not need battery backup.

Reset Circuit

A special reset circuit, the power supply supervisor U10, is included
in the design. If the +5 V supply line becomes lower than 4.5 V, the
reset output pin 5 goes low and the microcontroller will start over.
The length of the reset pulse is set by C88; 2.2 µF gives a pulse of ap
proximately 30 ms. U10 also controls the reset pulse during
power-up so that the microcontroller will be initiated correctly.

Keyboard Scanning

n

Main Board Keyboard & Display

U11

-

AD0-AD7 H0-H3

CPU

P1.0

HS1.0

P1.1

-

U13A

Latch

U14A
Latch

AD0-AD7

Board

V0-V7

LOCAL/PRESET

SCL
SDA

Fig. 4-13 Keyboard scanning.

The keyboard scanning is done in two modes. The first mode is ac
tive aslong asno buttonhas beendetected asdepressed. Then all out

-

­puts of U13A are set high, and the latch U14A is read. If no button
has been depressed, all outputs are low. This check is done at every
timer interrupt in the microcontroller, every 25 ms. If a button is
depressed, one of the output bits is high. When this event is detected,
mode two is entered. The outputs of U13A must be set high one after
the other to find the specific button. When found, only this button
will be checked, so other simultaneously depressed buttons will not
be recognized. The depressed button must stay down for several
timer interrupts before action is taken. After the button has been rec

­ognized, the timer interrupt SW will be waiting for the button to be
released. The button must be released for several timer interrupts be

-

fore the keyboard scanning returns to mode 1. Then the search for

-

other activated buttons can be resumed.

The following three buttons are not scanned in this way:

The ON button is connected to the ON/STANDBY logic in the

–

power supply.

CPU Latch

Key-

board

Latch

rd

GPIB

Fig. 4-12 Microcomputer circuits, block diagram.

4-12 Hardware Functional Description

RAM

Address Bus

UV

EPROM

OM

Address & Data Bus

2

ICBus

EE

PROM

Counter

ASIC

LCD

Drivers

LCD

The STAND-BY button is connected to the ON/STANDBY

–

logic in the power supply.

The LOCAL/PRESET button is connected directly to input pin

–

24 on the microcontroller U11. Pressing this button sends an
interrupt to a special handler in the SW.

Rear Panel Unit

The rear panel contains the following connectors

INPUTS:

External reference input D - REF IN (BNC)

–

External arming input E - EXT ARM (BNC)

–

Power supply inlet including EMI filter

–

OUTPUTS:

Internal reference output G - 10 MHz OUT (BNC)

–

If a GPIB interface is installed in the device, it is mounted on the rear
panel and connected to the main board with a flat cable.

Besides the normal standard GPIB connector, this optional unit also
has a BNC connector capable of outputting an analog representation
of any three consecutive digits on the display.

There is also a 6 SPST DIP switch on this unit for setting the default
GPIB address.

ON

ANALOG OUT

P M962 1
P M962 3
P M962 4
P M962 5

OF F

168 421
A DDRE S S

I E E E 4 88 / I E C 62 5 IN T ER F A C E
SH 1, AH1, T 5, L4, SR1,

RL1, DC1, DT 1, E 2

PM9626
PM9678
PM9690
PM9691

10M Hz O UT RE F I N E XT AR M

GDE

PM9628 /85
P M9697
_______
_______

EXT SUPPLY

12-24V DC

-I NT -S T BY
BAT T ERY

-EX T /L I NE

POWE R

90 V - 26 5V

PRIMARY FUSE

1.6AT

INSIDE

Fig. 4-14 Rear panel.

Hardware Functional Description 4-13

Optional Units

B

i

b

d

GPIB Interface Including Analog Output

GPIB, PM9626B

n

IC101/106/117

Analog Out

n

The result on the display can be converted to an analog signal by
means of a pulse-width-modulated (PWM) signal from the micro
processor. The signal is filtered, attenuated, offset-adjusted, inte
grated and buffered by IC103 and supporting passive components to
give an analog DC level between 0 and 4.98 V with a resolution of
20 mV. The analog output has a separate analog ground connected to
the cabinet.

-

-

oar

IC107/108

c
as

A0-15

AD0-15

IC111/
112

IC109/
110

IC113

IC114/115

GPIB

connector

IC116

+5V

Fig. 4-15 GPIB interface.

The GPIB interface controls the communication between the internal
microprocessor and the external GPIB bus. A 32K extension of the
ROM and RAM is placed on the interface board. An analog output is
also included. The PCB is connected to J18 on the main board with a
ribbon cable and fixed to the rear panel with two screws. Two metal
studs at the rear edge of the PCB are inserted in slots on the main
board in order to relieve mechanical stress.

The GPIB control circuit, IC113, communicates with the external
GPIB bus via the bidirectional bus drivers IC114 and IC115. IC113 is
controlled from the microprocessor by writing and reading in the in
ternal control registers. If IC113 has a message for the microproces
sor, it uses the GPIB interrupt signal. The address switch setting is
read by the microprocessor via IC116.

A 32K extension of both ROM (IC109 and IC110) and RAM (IC111
and IC112) is placed on the interface board. The circuit board is pre
pared for a 16-bit extension, but only 8 bits are used. IC110 (ROM),
IC112 (RAM) and R118 are not mounted. IC107, IC108 are address
latches andIC101, IC106and IC117 use the latched address to gener
ate chip select and chip enable signals for internal use on the GPIB
board.

HF Input

You can add an optional prescaler. This HF input is mounted on the
main board, to the right of the input amplifier. It is connected to J19
where there are three pins reserved for ID coding. Preparations have
thus beenmade forother prescalerswith different prescaling factors.

Prescaler 3.0 GHz, PM9624

n

This prescaler cannot be repaired at a local workshop. It must be sent
to the factory for repair.

The prescaler consists of the following parts:

Limiter

The limiter consists ofa6dBattenuator and a PIN diode at

–

tenuator to achieve constant input amplitude to the amplifiers.

Amplifier

–

Five amplifier stages are divided into three blocks. One block
consists of one amplifier. Two blocks consist of two amplifiers

each and an AGC control.

Automatic Gain Control (AGC)

Helps the amplifiers retain a constant output amplitude.

–

-

-

Dividers

Two dividers divide the input signal frequency by 16.

–

Detector

Detects whether the level of the input signal is high enough to

–

ensure correct measurement and, if not, blocks the output sig

-

nal from the prescaler.

Positive Voltage Regulator

–

-

Supplies a well-regulated voltage to the HF amplifiers.

-

-

-5.2V

Zero

IC103

PWM

Full scale

Fig. 4-16 Analog output.

4-14 Hardware Functional Description

IC103

+7V

Analog
Out

Software Functional Description

General

The PM 6685 software is divided into two main modules: the GPIB
and DEVICE modules. The GPIB fully implements the Message Ex
change protocol as described in the IEEE 488.2 - 1987 standard.

The DEVICE module is a real-time measurement executive that can
be interrupted to do other tasks, such as handling the keyboard, per
forming bus commands etc.

The basic structure of the main module is as follows:

main PM6685()

{

Initialize();

while (TRUE)

{

if (BREAKFLAG_KEYBOARD)

{
HandleKeyboard();

}

if (BREAKFLAG_PRESET)

{
PresetDevice();
}

if (BREAKFLAG_GPIBCOMMAND)

{
ExecuteGpibCommands();
}

if (BREAKFLAG_RESTART)

{
RestartMeasurement();
}

while (not any BREAKFLAG)

{
Measure( );
}

}

}

All break flags are set by interrupt-driven events, either from exter

-

nal functions (the GPIB interface) or from internal functions (timers

-

etc.).

The Initialize procedure does all necessary initialization at power
up. It also does the power up tests. See Power-On test in chapter 2.

-

The Handlekeyboard procedure controls all user input/output via
the front panel, except displaying the measurement results.

The PresetDevice procedure reprograms the complete device when
the PRESET key has been pressed (in local mode). It aborts pending
measurements.

The ExecuteGpibCommands procedure executes GPIB commands
and, if a query is received, it starts the response formatter and sends
the requested data to the GPIB interface. If the display is switched
on, the results are also displayed.

The RestartMeasurement procedure aborts pending measure

­ments; the measure loop will later continue to measure. This is
mainly used when the RESTART key is pressed.

The Measure procedure is the measurement control loop that is used
in local mode. It sends its result to the display.

The ParseGpibInputData procedure parses the GPIB messages
found in the input buffer and sends executable statements to the
ExeceuteGpibCommands procedure. The input of data to the input
buffer from the external GPIB interface is fully controlled in inter

­rupts. These interrupts are always enabled so the new data bytes can
be stored in the input buffer while parsing commands. This
ParseGpibInputDat is also executed in interrupt.

Software Functional Description 4-15

Test Routines

Test Routines via AUX MENU Key

The testroutines arethe routinesaccessible via the AUX MENU key.

Refer to the PM6685 Operators Manual.

Power-On Tests

At power-on some tests are automatically performed. If any of these
tests fails, an error message is displayed and the instrument is halted.
Pressing the LOCAL/PRESET key makes the device continue inde
pendently of the detected error, but without performing the next tests
in the start-up sequence.The following tests/actions are performed:

Write 001 to internal test pins

–

Pulse all microcomputer i/o ports twice

–

Write 0.1 on display

–

Write 0.1.2. on display and 010 on test pins

–

Test mC internal RAM ( error = Err mC & halt)

–

Write 0.1.2.3 to display and 011 on test pins

–

Test mC timer ( error = Err mC & halt)

–

Write 0.1.2.3.4. on display and 100 on test pins

–

Test main board RAM ( error = Err ra. & halt )

–

Write 0.1.2.3.4.5. to display and 101 to test pins

–

Test ASIC ( error = Err. 5xx & halt)

–

Write 110 on test pins

–

Check display (light all segments for 2 s)

–

Clear Display

–

Perform GPIB RAM test if GPIB is installed

–

(error = Err ra. & halt)

Write 111 on test pins ( final value)

–

Clear display and start normal measurement procedure

–

-

4-16 Software Functional Description

Chapter 5

Repair

Preventive Maintenance

Calibration

To maintain the performance of your counter we recommend that
you calibrate your instrument every year, or more often, if greater
time base accuracy is required. Calibration should be performed with
traceable references and instruments at a certified calibration labora
tory. Contact your local Fluke representative for calibration.

To know the present status of your instrument, test your timer/coun
ter from time to time. The test can be made according to the informa
tion in Chapter 2, Performance Check.

Oscillators

The frequency of the reference crystal oscillator is the main parame
ter affecting accuracy in a counter. The frequency is affected by ex
ternal conditions like the ambient temperature and supply voltage,
but also by aging. When recalibrating, the reference crystal oscillator
is compensated only for deviation in frequency due to aging.

Some important points:

n

The high stability oscillators have been built into an oven in

–

order to keep the oscillator temperature as stable as possible.
Continuous operation is also important for stability. After a
power interruption, the oscillator restarts at a slightly different
frequency. It will then, as time goes on, age at an equal rate.

The stability indicated for the oscillators is valid within a tem

–

­perature range of 0 to +50 °C, with a reference temperature of
+23 °C. If the timer/counter is used in a room temperature of
20 to 30 °C, the temperature stability of an OCXO will be in

-

creased by a factor of 3.

-

-

-

The temperature stability indicated for the standard oscillator is

–

mainly dependent on the ambient temperature. When the coun
ter is operating there is always an internal temperature increase
that will influence the oscillator.

Recalibration intervals

n

-

The Mean Time Between ReCalibration, MTBRC, is defined as:

-

MTBRC

Acceptable error Temperature stability

=

-

−()( )

Agi

(

ng)

MTBRC can be calculated when the total acceptable error and the
oscillator specifications are known.

The total acceptable error is defined as:

()

()

Acceptable error

Deviation of reference frequency

=

(

Nominal reference frequency)

Model PM6685 PM6685R

Option:

Timebase type:

Total uncertainty,

0°Cto50°C,at2

- 1 month after calibration

- 3 months after calibration

- 1 year after calibration

- 2 years after calibration

Typical total uncertainty, for operating

temperature 20°C to 26°C, at 2

dence interval:

- 1 month after calibration

- 3 months after calibration

- 1 year after calibration

- 2 years after calibration

*

After 1styear of operation. For 1styear add: < 3x10

for operating temperature

s (95%) confidence interval:

s (95%) confi

Standard
UCXO

< 1.2 x 10
<1.2x10
<1.2x10

<1.5x10

-

<4x10
<4x10
<7x10
<1.2x10

Table 5-1 Stability of timebase oscillators.

5-2 Preventive Maintenance

PM9691
OCXO

-5

-5

-5

-5

-6

-6

-6

-5

-10

<3x10
<4x10
<1x10

<2x10

<3x10
<4x10
<1x10
<2x10

-8

-8

-7

-7

-8

-8

-7

-7

PM9692
OCXO Rubidium

-9

<8x10
<1.2x10
<2.5x10

-8

<5x10

-9

<8x10
<1.2x10
<2.5x10

-8

<5x10

-8

-8

-5

-8

<4x10
<4x10
<4x10

<6x10

<1x10
<2x10
<2.5x10
<5x10

-10

-10

-10 *

-10 *

-10

-10

-10 *

-10 *

Example:

A user can accept a maximum of 3 Hz deviation on the

–

10 MHz frequency of the oscillator. This results in:

()Acceptable error =

3

×

10 10

6

=×

310

−

7

The aging and temperature factors can be selected from the table on
page 5-2.

The value of the aging factor is correctly selected from the table
when the calculation of MTBRC results in 1 to 30 days (use /24h), 1
to 12 months (use /month) or over 1 year (use /year) (not, e.g., 43
days or 17 months or 0.8 years).

Example:

The user has the same requirements as in the example above.

–

The counter has a PM9691 oscillator.

Look up information about PM9691 in the table on page 5-2.

–

The results will be the following:

Relative Frequency deviation caused by:

Ambient temperature deviation

–

(within 0 to 50 °C; reference point at 23 °C): Less than

–8

3*10

Aging/year: Less than 1.5 * 10

–

Use the MTBRC formula with the above values. This gives a

–

–7

MTBRC of maximum:

78

−−

310 310

×−×

−

15 10

×

.

18

=

7

. year

NOTE: When recalibrating, the reference crystal oscillator will be

compensated only for frequency deviation caused by aging.

When to Replace the Fan
(PM6685R only )

To maintain the high reliability of a counter used in
around-the-clock’ applications, you must replace the fan every sec
ond year. For part time and low ambient temperature use, you can ex
tend this service interval to 6-10 years or more. Additional informa
tion can be found in Chapter 9, Appendix.

-

-

-

Preventive Maintenance 5-3

Troubleshooting

General

Quick Troubleshooting

The PM6685is ahighly integratedFrequency counterwith dedicated
LSI counter circuits and microcontrollers that control the complete
units. The microcontroller can help you locate faulty parts by run
ning test programs and generating stable signal patterns on t
he bus. If the microcontroller does not work or the fault is in a part of
the counter that cannot be accessed by the microcontroller, tradi
tional troubleshooting must be performed.

Where to Start

After reading the safety instructions, continue with this chapter for
troubleshooting and repair instructions. When you have fixed the in
strument, always do the Safety Inspection and Test after Repair, as
described later in this Chapter. Then do the checks in Chapter 2, Per
formance Check. Recalibrate if required by following the adjustment
instructions in chapter 6, Calibration Adjustments.

Logic Levels

The PM6685 contains logic of four families. The levels for these
families are listed in the following table.

Positive

ECL

Supply voltage +5 V -5.2 V +5 V +5 V
Signal ground 0 V 0 V 0 V 0 V

Input voltage

High, V

IH >+3.9 V >-1.1 V >+4 V >+2 V

Low, V

IL <+3.5 V <-1.5 V <+1 V <+0.8 V

Output voltage

High, V

OH >+4 V >-1 V >+4.9 V >+2.7 V

Low, V

OL <+3.3 V <-1.7 V <+0.05 V <+0.4 V

Bias ref. voltage, V

BB +3.7 V -1.3 V - -

Table 5-2 Logic levels.

Negative

ECL

CMOS TTL

Required Test Equipment

To test the instrument properly using this manual, you will need the
equipment listed below. The list contains specifications for the criti

-

cal parameters.

-

-

DMM

Oscilloscope 300 MHz 2-channel
Signal generator 3300 MHz
Power supply 12 V/2 A
BNC-BNC 50 W cables RG-58

Type Performance

3.5 digits

Table 5-3 Required test equipment.

-

-

PROM Identification

There are two different PROMs in the PM6685, one on the main
PCB containing the instrument firmware, the other on the optional
GPIB board, containing the interface bus firmware.

They have labels with version designation of the traditional form
Vx.yz, where x, y, and z are digits. The last digit can be followed by a
single letter. The version numbers do not have to coincide, except for
the last letter. So the combination Vr.stE and Vu.vwE is valid,
whereas Vr.stE and Vu.vwF is not.

Operating Conditions

Power voltage must be in the range of 90 to 260 VAC.

Introduction

GPIB(Level 10)

IN P U T A M P LIF I E R ( L ev el 9 )

D / A C O N VE R TE RS ( L ev el 8 )

MEASU RING LOG IC (Le vel7 )

KEY BOARD (L eve l6 )

INT E RN A L CONT R O L S IG NAL S & DIS P LA Y (L ev el 5 )

MICROCOMPUTER KERNEL (Level4)

MICROCONTROLLER (Level 3)

OSCILLATOR(Level2)

POWE RSU PPL Y ( Level 1)

Fig. 5-1 Functional levels.

5-4 Troubleshooting

The troubleshooting strategy for the PM6685 is an integrated part of
the overall service strategy for the instrument. This instrument is hi

-

erarchically designed in different levels, and troubleshooting can be
performed in any design level if the lower levels are OK. It is, there
fore, important to disconnect all options at the beginning of the trou
bleshooting procedure.

Power Supply

J3

J4

Fuse

J9

1 5

J10

TP22, +7

Power

Module

6 14

TP17, -7

J15

TP16, +15

+5V adjust

TP15, +5

J16

TP20, -5.2

J21

Load

Disconnected

Connected

TP23, +5

TP21,+12V

To verify the Power Module proceed as follows:

-

-

If the primary fuse is broken, there is a short circuit in the

–

primary circuits. Use a DMM and try to locate the fault by
resistance measurements.

Disconnect L6 and check the resistance between pin 1 and

–

pins 4 and 5 on the power module. The DMM should not
show a short circuit. Put L6 back.

Check that the DC voltage between pin 1 and pins 4 and 5

–

on the power module is about Ö2 times the input
AC-voltage. If not, use traditional troubleshooting tech

-

niques to locate the fault.

–

Remove the power cable from the counter.
Measure the resistances according to the table below.

–

Test Pins Resistance

(GND) and TP15 (+5 V) » 10 W

(GND) and TP16 (+15 V) »1.5 kW

(GND) and TP17 (–7 V) »270 W

Table 5-5 Output resistances.

If one of the above-mentioned measurements shows 0 W,

–

remove L7, L8, and L9 and use conventional troubleshoot

­ing techniques to isolate the fault.
Measure the resistances according to the table below.

–

Test Pins Resistance

10, 11 and 13, 14 »150 W

8 and 9 »1.5 kW
6 and 7 »270 W

Table 5-6 Output resistances.

Fig. 5-2 Test points and trimmers for the power supply.

Connect the counter to line power.

Set the counter to STAND-BY mode.

–

Check that the voltage between J9 and J10 is in the range of

–

90 to 260 VAC, (see Fig. 5-2).

Check that the input voltage to the power module, U39 be

–

tween pin 1 and pins 4 and 5 on the bottom side of the PCA, is
120 to 375 VDC.

Move the jumper J16 to the DISCONNECT position.

–

Check the “STAND BY” voltages after the power module,

–

U39. Use for instance the screen around the input amplifier as
ground connection. There are also a number of ground pads on

the PCB available for this purpose.

Test Points Voltage

TP15 +5.10V±10mV*
TP16 +14.8 V to +21 V
TP17 –12.5 V to –7.5 V

TP21 +12 V ± 0.5 V

Table 5-4 Standby voltages.

If the resistances deviate considerably from the values in the table,
the complete power module must be replaced.

Move jumper J16 to the CONNect position.

–

Connect the power cable to the counter.

–

Switch the counter ON.

–

Check the “POWER ON” voltages.

–

Test Points Voltage

TP23 +5.06V±30mV*

-

TP20 –5.2V±50mV
TP22 +7 V ± 100 mV

Table 5-7 Power-on voltages.

*NOTE: If the +5 V voltage is outside the specification, all

other levels will be wrong, since they are based on the
+5 V level.

If you find any fault, continue with traditional troubleshooting tech

-

niques and replace defective circuits. Also refer to Power Supply in
Chapter 4, Circuit Descriptions.

*NOTE: If this voltage does not meet the above-mentioned

spec, and if it is not possible to adjust it, the output
resistances of the module must be checked.

Troubleshooting 5-5

Oscillator

d

1

Optio

1

U23

Check that the RESET circuit U10 works properly by moving

–

B2

Stan

C1

J27

1

U23

14

Optional OCXO

Coarse adjust

Fine adjust

r

J24

B1

U22

U17U16

44

61

U11

1

10

27

J13

J14

J11

J29J30

J12

U29

81

1

31

J23 J25

51

Fig. 5-3 Test points and jumpers for checking the

microcontroller.

U14

U13

Optional oscillator
Standard oscillator

B2

C115

the RESET jumper J29 temporarily to the ON position.

If the CPU is not running, check the state of the pins J11-J13. See ta

-

ble below.

Fig 5-4 Trimmers for the reference frequency oscillators.

Standard Oscillator

n

Be sure the jumpers J23 and J25 are in the STD position, (see

–

Fig. 5-4).

Check that 10 MHz is present at U29, pin 42.

–

Check that 10 MHz is present at the rear panel connector

–

10 MHz OUT (J27).

If you find any fault, continue with traditional troubleshooting tech
niques and replace defective circuits. Also refer to Chapter 4, Circuit
Descriptions, Oscillator Circuits.

OCXO, PM9691 or PM9692

n

This test can be carried out only if the counter is equipped with one of
the optional oscillators, PM9691 or PM9692.

Be sure the jumpers J23 and J25 are in the OPT position, (see

–

Fig. 5-4).

Check that 10 MHz is present at U29, pin 42.

–

Check that 10 MHz is present at the rear panel connector

–

10 MHz OUT (J27).

These oscillators cannot be repaired in a local workshop. They must
be sent to the factory for repair.

Microcontroller

Check that 6 MHz is present at U11, pin 65 (see Fig.5-3).

–

Display JP11, J12,

0.1 0, 0, 1 - mC I/O port

0.1.2 0, 1, 0 Err UC mC internal

0.1.2.3 0, 1, 1 Err UC mC timer er

0.1.2.3.4 1, 0, 0 Err rA RAM error Replace U22

0.1.2.3.4.5 1, 0, 1 Err ASIC ASIC error Replace U29
All seg

ments

-

J13

1, 1, 0

-

1, 1, 1 Err rA GPIB RAM

Message Error Action

error

RAM error

ror

error
Test OK

Replace U11

Replace U11

Replace U11

-

Replace U111 on
GPIB board

Table 5-8 Start-up test.

If you find any fault, continue with traditional troubleshooting tech

­niques and replace defective circuits. Also refer to Chapter 4, Circuit
Descriptions.

NOTE: Check that activity is going on at U11 pin 62 (ALE), pin

61 (RD), pin 63 (INST), and pin 43 (READY). These
pins should not be stuck HIGH or LOW.

If one or more bits on the AD-bus are corrupt, the

–

microcontroller ( mC) often reads the same instructions re

-

peatedly. When the mC discovers an invalid OP code, it will
RESET itself and start from the beginning again. The mC

sets the RESET input low when it resets itself. This can be
discovered at the RESET input of U11, (pin 16). If +5 V to
U10 is OK, this could be the cause of trouble.

5-6 Troubleshooting

Input Amplifier

A Input Check

n

DC levels

Switch on the counter.

–

Press LOCAL/PRESET and ENTER.

–

Deselect AUTO and set the sensitivity to 1 Vrms.

–

Measure the DC voltages according to Fig. 5-5. Use the DMM

–

with a 10 kW resistor in series with the test cable.

AC levels

Connect a 1000 Hz sine wave signal with an amplitude of

–

1V

to Input A.

pp

Measure the AC-levels according to Fig. 5-5. Use the oscillo

–

scope and a 10 MW probe.

If you find any fault, continue with traditional troubleshooting tech
niques and replace defective circuits. Also refer to Input Amplifiers
A and B in Chapter 4, Circuit Descriptions.

-

-1.7V -0.9V

U9

TP27, -1.4V

TP10

7V

TP26, -1.4V

TP11

-3V

-2.3V

Q2

D4

2V

R91

Q13

Q1

U8

Q4

0.8V

4.3V

0.8V

0.4V

-

R31R33

0V

0.6Vpp

U1

0V

0.3Vpp

1.5V

0.6Vpp

Q3

D3

-2V

0.6Vpp

D1

1Vpp

R23

R22

D2

C2

C1

Fig. 5-5 Typical voltages, input amplifier.

Troubleshooting 5-7

Prescaler 3.0 GHz, PM9624

n

See Chapter 2, Performance Check, for verification.

Sensitivity

-10 dBm

-20 dBm

-30 dBm

-40 dBm

-50 dBm
0

Fig. 5-6 Specified and typical sensitivity of input C

(PM9624).

This prescalercannot be repaired in a local workshop. It must be sent

to your Fluke representative for repair.

1GHz 2GHz

2.5 GHz

Frequency

GPIB Interface and Analog Output

Setup

Connect the counter to line power.

–

Switch on the counter.

–

–

Press PRESET and then ENTER.

Connect a DMM to the BNC output BU102.

–

Activate the analog output.

–

Select AUX MENU.

–

–

Press DATA ENTRY p /q until the display reads ANA
LOG OUT.

Press ENTER

–

Press DATA ENTRY p/q to select ON.

–

Press ENTER.

–

Press DATA ENTRY p/q until the display reads 1.0-3V.

–

Press ENTER.

–

Connect a LF synthesizer to Input A on the counter.

–

Set the synthesizer to 500 Hz, 1 V

–

Read the DMM result. The voltage should be 2.49 V ± 35 mV.

–

Minor deviations can depend on the settings of the trimmer potenti
ometers for ZERO and FULL SCALE. See Chapter 6, Calibration
Adjustments, for a decription of the procedure to follow.

PP

-

-

BU103

U114 U115

U113

Zero

U116

BU102

U103

Full Scale

GPIB

U108

U109

BU101

U107

U117

Fig. 5-7 Component layout, GPIB interface.

General Remark

n

If the GPIB board is suspected to be faulty, be sure the basic instru
ment is OK by performing a few functional checks after the ribbon
cable has been disconnected from J18.

Analog Output

n

The microcontroller generates a PWM signal that is applied to pin 1
on U101.The frequencyis approximately 20 Hz, but the duty cycle is
dependent on several factors like the frequency of the measured sig
nal, the measurement time, and the selected scaling factor.

U106

U111

U101

Large deviations indicate a fault. Trace the signal through the inte
gration chain with traditional troubleshooting techniques and replace
defective circuits. The duty cycle at U101:1 should be 50 %. Also re
fer to GPIB Interface Including Analog Output in Chapter 4, Circuit
Descriptions.

Bus Interface

n

A simple method to check the most fundamental functions of the in
terface is to send the standardized query message*IDN? and check
the response string.

-

-

-

Setup

Make sure you have access to a PC with GPIB capability.

–

Check that there is a program installed that can send simple

–

commands entered via the keyboard and that can receive and
display the response strings.

Connect the GPIB connectors of the counter and the PC by

–

means of a standard GPIB cable.

Set the address switches on the counter (the five rightmost

–

ones seen from the rear) so that their binary weight corre
sponds to the wanted decimal value between 0 and 30.

Send the command*IDN? to the counter and observe the re

–

sponse string. See the programming manual for more
information on the response format and contents.

You can also try the command*OPT? to get a listing of in

–

stalled options (except OCXO).

-

-

If you find a fault, continue with traditional troubleshooting tech
niques and replace defective circuits. Try to exercise the address/data
bus by writing small program loops. Look for stuck nodes with an
oscilloscope.

-

-

-

-

The PWM signal is converted to a DC voltage between 0 V and

4.98 V by integration, first in a passive RC network (R101, C103,
R102, C102 and then in an active integrator U103.

5-8 Troubleshooting

Safety Inspection and Test After Repair

General Directives

After repair in the primary circuits, make sure that you have not re
duced the creepage distances and clearances.

Before soldering, bend component pins on the solder side of the
board. Replace insulating guards and plates.

Safety Components

Components in the primary circuits are important to the safety of the
instrument and may be replaced only by components obtained from
your local Fluke representative.

Checking the Protective Ground
Connection

­Visually Check the correct connection and condition and measure

the resistance between the protective lead at the plug and the cabinet.
The resistance must not be more than 0.5 W. During measurement,
the power cord should be moved. Any variations in resistance show a
defect.

Safety Inspection and Test After Repair 5-9

This page is intentionally left blank.

5-10 Safety Inspection and Test After Repair

Chapter 6

Calibration

Adjustments

Introduction

Required Test Equipment

Type Performance

DMM Acc. 0.02% / Res. 1mV
HF synthesizer 3300 MHz
Pulse generator 125 MHz/2nsrise/fall time

LF synthesizer 50 MHz / 20 Vpp
Oscilloscope 300 MHz / 2-channel
Passive probe 10:1, preferably 500 W (or well

FET probe 300 MHz
Power supply 12V/2A
Power splitter 50 W /4W
Feed-through termination 50 W

10 MHz reference 1x10
10 MHz reference 1x10-9*
BNC-BNC cables Different lengths
Screwdrivers Torx 10 & 20

Table 6-1 Required test equipment.

* For adjustment of PM9691 and PM9692 Oven Oscillators only.

Note: Only calibrated instruments should be used.

compensated 10 MW)

-7

J3

J4

J9

1 5

Power

Module

6 14

TP17, -7

J15

TP16, +15

Fuse

J10

+5V adjust

TP15, +5

J16

TP20, -5.2

J21

Load

Disconnected

Connected

TP22, +7

TP23, +5

TP21,+12V

Preparation

WARNING: Live parts and accessible terminals which

can be dangerous to life are always exposed inside
the unit when it is connected to line power. Use ex
treme caution when handling, testing, or adjusting
the counter.

Before beginning the calibration adjustments, power up the instru
ment andleave iton forat least30 minutesto letit reachnormal oper
ating temperature.

Power Supply

CAUTION: If you adjust the +5 V trimmer you have to

adjust the complete instrument.

Setup

n

Remove the protective cover above the power module.

–

WARNING: The heat sink inside the power module is

connected to line power.

Connect the counter to line power.

–

Switch on the counter.

–

Press PRESET, then press ENTER.

–

NOTE: The backlight must be switched on during the adjust

ment of the power module.

Fig. 6-1 Test points and trimmer for the Power Supply.

Adjustment

n

-

-

-

-

Connect the DMM to test point TP15 = +5V and GND, (see

–

Fig. 6-2).

Adjust the +5V trim potentiometer inside the power module

–

until the DMM reads +5.10 ± 0.01 V.

Check that the voltage between the test point TP23 = +5 V and

–

GND is +5.06 ± 0.03 V.

Check that the unregulated voltage from the power module at

–

test point TP16 = +15 V is about +18 V.

Check that the unregulated voltage from the power module at

–

test point TP17 = –7 V is about –8 V.

Reinstall the protective cover onto the power module.

–

6-2 Introduction

Input Amplifier

P

Connect the other output from the power splitter to channel A

–

of the oscilloscope.

The instructions in this section are consecutive. Do not change a set
ting until you are told to do so, either in the text or in the tables.

Setup

n

Remove the screen shield before performing any adjustments

–

in the input amplifier.

Connect the counter to line power.

–

Switch on the counter.

–

Press PRESET, then press ENTER.

–

TP27

,SENSE

TP10, T R IG L E V E L COM P I

ZERO ADJ. COMP I

ZERO ADJ.COMP II

Sense Adj.

1

J2 U8

13

Li n A (R31)

Offset A (R33)

TP26, SENSE

TP11, TRIG LEVEL COM

-

PM6685

Pulse generator

Oscilloscope

Input A 50 W

Sensitivity Any level below 1 V

Amplitude 5Vppin 50 W

Period 2 ms, symmetrical

Time 200 ms/div

Setting: A 0.5 V/div, 50 W,DC

Setting: B 20 mV/div, 10:1 probe, DC

rms

Table 6-2

NOTE: The Pulse Generator with 50 ohm output impedance

should be set to 5 V
level recorded at the CRO A channel (equal to the in
put to the DUT) is 2.5 V

when loaded in 50 W, so that the

pp

, after going through the split

pp

-

-

ter.

NOTE: If you are using a 10 MW x10 CRO probe, ensure that

its compensation has been correctly adjusted, so that
incorrect observations of undershoots/overshoots are
not made.

Use the probe to connect channel B of the oscilloscope to

–

Pin 10 of U8 .

Adjust R31 = LIN A until both signals look as alike as possi

–

-

ble.

NOTE: The AC coupling will give the curve a slight tilt.

X1(C2)

X11 (C1)

Fig. 6-2 Test points and trimmers for the Input amplifiers.

Offset

–

Connect the DMM to Pin 10 of U8 and GND = screen, see
Fig. 6-2. Pin 1 is marked in the figure and is the middle pin on

the side closest to the rear of the unit. Alternatively you can
use one of the soldering pads of resistor R114 as a test pad, as
it is connected to Pin 10. This resistor is normally not
mounted.

Adjust R33 = OFFSET A until the DMM reads 0.0 ±0.2 mV.

–

Linearity

Setup

n

Press the Waveform Key once. (This step puts the instrument

–

into the correct mode so that it switches from x1 Attenuator to
x11 Attenuator when the sensitivity is adjusted above 2.8V.)

Connect the pulse generator to the A input of the counter via

–

the power splitter.

x1 Attenuator

Setup

n

PM6685

Pulse generator

Oscilloscope

Impedance 50 W

Sensitivity Any level below 1 V

Amplitude 5Vppin 50 W

Period 100 ms, symmetrical

Time 10 ms/div

Setting: A 0.5 V/div, 50 W,DC
Setting: B 20 mV/div, 10:1 probe, DC

rms

Table 6-3

Adjust C2 = X1 until both signals on the screen look as alike

–

as possible, without any overshoots or undershoots. The level
displayed on the CRO B channel for Pin 10 of U8 is approxi
mately 1.2 V

.

pp

x11 Attenuator

Setup

n

PM6685

Pulse generator

Oscilloscope

Table 6-4

Adjust C1 = X11 until both signals on the screen look as alike

–

as possible, without any overshoots or undershoots.

Impedance 50 W

Sensitivity Any level above 2.8 V

Amplitude 5V

Period

Time 10 ms/div

Setting: A 0.5 V/div, 50 W,DC
Setting: B 5 mV/div, 10:1 probe, DC

pp

100 ms, symmetrical

rms

-

Input Amplifier 6-3

Observe that the level displayed on the CRO B channel for

1

U23

–

Pin 10 of U8 is now approximately 120 mV
the x11 Attenuator has been selected.

, indicating that

pp

Reference Oscillators

Trigger Levels

Setup

n

PM6685

Table 6-6

Disconnect all input signals to the counter.

–

Zero levels

n

Channel A

Connect the DMM to test points TP10 = TRIG LEVEL

–

COMP I and GND = screen.

Adjust R69 = ZERO ADJ COMP. I until the DMM reads

–

+0.95 ± 0.05 mV.

Connect the DMM to test points TP11 = TRIG LEVEL

–

COMP II and GND=screen.

Adjust R70 = ZERO ADJ COMP. II until the DMM reads

–

–0.95 ± 0.05 mV.

Impedance 50 W

Sensitivity 10 mV

rms

Sensitivity

Setup

n

Measure the DC voltage between test points TP26="–" and

–

TP27="+", (see Fig. 6-2).

Adjust R91 = SENSE until the DMM reads 10 ± 0.2 mV.

–

Offset

Setup

n

J27

Optional OCXO

Coarse adjust

Fine adjust

J24

U29

81

1

31

51

J23 J25

Optional oscillator
Standard oscillator

B2

Fig. 6-3 Trimmers for the reference oscillator frequency.

NOTE: The standard oscillator is always mounted in the unit,

even if an optional oscillator is installed. You set the
jumpers J23 and J25 to select the timebase source
that you want to use.

C115

PM6685

Signal generator

Table 6-5

Connect the Signal generator to the A input of the counter.

–

–

Press NULL on the counter.

Decrease the amlitude from the signal generator to

–

–28 dBm.

Adjust R33 = OFFSET A until the counter reads < ±100 Hz.

–

If this is not possible, adjust R91= SENSE until the counter

–

reads < ±100 Hz.

NOTE: Reinstall the screen shield after making these adjust

ments.

Impedance 50 W

Sensitivity 10 mV

Amplitude –18 dBm

Frequency 50 MHz

rms

Standard Oscillator

Setup

n

Connect the counter to line power.

–

Switch on the counter.

–

Press PRESET, then press ENTER.

–

Connect the 10 MHz reference to the A input of the counter.

–

Press CHECK, NULL, and CHECK again.

–

The adjustment should preferably be made at an ambient tempera
ture of +23 °C.

Adjustment

n

Adjust C115 = STD OSC ADJ, until the counter reads

-

–

10 MHz ± 5 Hz.

NOTE: Move the two jumpers J23 and J25 back to position

OPT if an optional oscillator is installed.

-

6-4 Reference Oscillators

Oven-Controlled Oscillators (OCXO),
PM9691 & PM9692

PM9691 is adjusted to 10 MHz ± 0.2 Hz when manufactured,
PM9692 to 10 MHz ± 0.05 Hz, so there is no need to adjust the fre
quency directly after installation.

These oscillators, like any oscillator, change frequency because of
aging. Use the table in the User’s Handbook, Chapter 11, to calculate
when calibration is due. The complete specifications can be found in
the same manual, Chapter 12.

Required test equipment

Instrument Required specification Model

Counter with Rubidium
Reference

Table 6-7

Setup

n

Connect the counter to the line power.

–

Switch on the counter.

–

Set the counter to default settings (preset).

–

Make the adjustment at an ambient temperature of +23 °C, if possi
ble. The oscillator must have been operating continuously for 48
hours before an adjustment.

Connect the 10 MHz OUT socket of the counter to be adjusted

–

(rear panel) to the Input A of the PM6681R/PM6685R.

Set up the PM6681R/PM6685R:

–

Measuring time = 0.5 s

–

50 W input impedance

–

Frequency A measurements

–

10 MHz ± 0.01 Hz (Uncer
tainty £ 1x10

-9

)

-

PM6681R or
PM6685R

Coarse adjustment

Make this adjustment only if the trimmer range is insufficient to ad
just the oscillator.

–

-

-

Remove the tape from the DIP-switch.

Adjust the trimmer to its mid position (about 12 turns from ei

–

ther end position).

Read the frequency on the PM6681R/PM6685R.

(Nominal 10.000000 MHz).

If the frequency is too low, set the DIP-switches to the next

–

higher voltage range.
If the frequency is too high, set the DIP-switches to the

–

next lower voltage range.

Trimmer range (V) DIP switch number (1 = on, 0 = off)

12345678

2.6-3.4 00 01 00 00

3.2-3.9 01 01 10 00

3.5-4.3 10 01 10 00

4.0-4.7 10 11 11 00

4.1-5.0 10 10 11 10

Table 6-8

NOTE: There are also oscillators that do not have DIP

switches. If this is the case, then the trimmer potenti
ometer alone covers the whole adjustment range.

-

-

-

Adjustment

n

The oscillator has a voltage controlled adjustment range. This range
is divided into five fixed steps set via DIP switches, and a trimmer to
fine tune the control voltage.

Trimmer for fine tuning

Connector

Switches for coarse adj.

Fig. 6-4 Adjusting the optional oscillator frequency.

Normally the range of the trimmer should be sufficient to compen
sate for the aging that occurs during at least two years of operation.

Fine adjustment

Adjust the trimmer to better than 10 MHz ± 0.2 Hz (PM9691)

–

or 10 MHz ± 0.05 Hz (PM9692), i.e. ±20 resp. ±5 in the last
two digits on the PM6681R/PM6685R display.

If this adjustment is OK, reassemble the counter.

–

-

Reference Oscillators 6-5

Other Options

HF Input 3.0 GHz , PM9624

J19

HF input

R61

TP1
TP9

GPIB Interface, PM9626B

BU103

U114

U115

U113

GPIB

U108

U109

BU101

U107

U106

Fig. 6-6 Trimmers for the GPIB interface.

Setup

n

Zero

U116

U111

U101

BU102

U103

Full Scale

Fig. 6-5 Test points and trimmers for the 3.0 GHz HF

NOTE: Before beginning any adjustments, the HF input must

Setup

n

PM6685
Signal gener

ator

Table 6-9

Connect the counter to line power.

–

Switch on the counter.

–

Press PRESET, then press ENTER.

–

Connect the signal generator to the HF input.

–

n

Adjustment

–

Turn the potentiometer R61, (see Fig. 6-5) fully counterclock­wise.

Check that the GATE indicator stops blinking.

–

Turn R61 slowly clockwise until the GATE indicator starts

–

blinking.

The input frequency, 800 ± 25 MHz, will now be displayed.

To verify the 3.0 GHz HF input, a sweep frequency synthesizer is
needed. Also refer to Chapter 2 - Performance Check: Options,
Prescaler.

input.

have been in operation for at least one minute to let it
reach normal operating temperature.

Function FREQ C

Frequency 800 ± 25 MHz

-

Amplitude 5.9 ± 0.5 mV

rms

PM6685
LF synthe

sizer

Table 6-10

Connect the counter to line power.

–

Switch on the counter.

–

Press PRESET, then press ENTER.

–

Connect the DMM to the BNC output of the analog output.

–

Activate the analog output.

–

–

–

–

–

–

–

–

Connect the LF synthesizer to the A input of the counter.

–

The counter should read 1000.0xxxxx Hz.

n

Adjust the trimmer ZERO (see Fig. 6-6) until the output volt

–

ageis0V±1mV.

Set the LF synthesizer to 999.90 Hz/1Vppsquare wave.

–

The counter should read 999.9xxxxx Hz.

Adjust the trimmer FULL SCALE (see figure 6-6) until the

–

output voltage is 4.980 V±3mV.

–

Set the LF synthesizr to 100.01 Hz/1Vppsquare wave.

The counter should read 100.0xxxxxx Hz.

Check that the output voltage is 500 mV±5mV.

–

-

Select AUX MENU.
Press DATA ENTRY UP/DOWN keys until the display

reads ANALOG OUT.
Press ENTER.
Press DATA ENTRY UP/DOWN keys to select ON.

Press ENTER.
Press DATA ENTRY UP/DOWN keys to until the display

reads 1.0
Press ENTER.

-3

V.

Adjustment

Input A 50 W / AC / Manual trigger levels

Amplitude 1V

Period 1000.01 Hz square wave

pp

-

6-6 Other Options

Chapter 7

Replacement Parts

Introduction

Standard Parts

Electrical and mechanical replacement parts can be obtained through
your local Fluke organization or representative. However, many of the
standard components can be obtained from other local suppliers. Before
purchasing or ordering replacement parts, check the parts list for part
number, value, tolerance, rating, and description.

If the value of the physical component differs from what is described in
the parts list, you should always replace the part with the same value as
originally mounted.

Standard parts are unmarked or marked with an ‘S’ in the P column of
the parts lists.

Special Parts

In addition to standard electronic components, the following special
components are used:

Components that are manufactured or selected by the manufac

–

turer to meet specific performance requirements.

Components that are important for the safety of the instrument.

–

Both types of components may be replaced only by components ob
tained through your local Fluke organization.

NOTE: Physical size and shape of a component may af

fect the performance of the instrument, particularly at
high frequencies. Always use direct replacements un
less it is known that a substitute will not degrade the
performance of the instrument.

These parts are ‘Recommended Replacement Parts’ and are marked
with an ‘R’ in the P column of the parts lists.

Components marked with a ‘P’ in the P column are ‘Production items’
not kept in replacement parts stock. These items can be ordered, but the
delivery time is longer than for normal replacement parts.

-

-

-

-

7.2 Replacement Parts, Introduction

Mechanical Parts

Pos Description Part Number P

PCA 1, Main board 4031 100 65420 P

PCA 2, Front board 4031 100 48250 P
13 Stand-off, plastic 5322 532 12746 R
18 Textplate kit 4031 100 62430 R

20 Rubber keypad 4031 100 62720 R
22 Cover and Front panel 4031 100 49570 R
25 Rear panel 5322 447 31085 P
34 Profile-support 5322 460 60542 P
35 Profile-support 4031 100 53210 P

38 Shield cover 5322 447 91931 P
39 Shield cover 5322 462 50459 P
50 Rearfoot, cabinet, m-90 5322 462 41719 R
52 Bottom foot, cabinet, m-90 5322 462 41554 R
53 Bracket, cabinet 5322 401 11422 R
54 Spring, cabinet 5322 492 63808 R

Pos Description Part Number P

56 Rubber foot, sj-5018 black 5322 462 44434 R
58 Tilting support 5322 401 11471 R
62 Coax connector 5322 267 10004 S
63 Coax connector 5322 265 10264 R

64 Soldering tag, 9.6X15/15 ms fs 5322 290 30318 S
67 Toroid core 30nh rcc9/6/3 4c65 violet 5322 526 10545 P
68 Bottom shield 5322 447 91829 P
70 BNC holder 4031 100 48830 P
84 Mains filter 1a fs3514-1/07 5322 121 42352 R

90 PCA guide for prescaler 5322 401 11347 P
92 Stand-off nut M3x14 4031 100 48800 P
100 Washer, 4.0X10x2 pa6-6 5322 532 52364 P
102 Washer, 9.5X13x2.3 4822 532 10222 P
104 BNC plate, 25.4X25.4 5322 466 82868 P
110 Insulate plate 5322 466 61932 P

122 Shielding strip 610mm 99-210

self-adhesive

150 Screw, mrt-kombi 3x06, stfz 4822 502 11658 P
152 Screw, mrt-kombi 3x08, stfz 5322 502 21489 P
156 Screw, mrt-kombi 4x16, stfz 5322 502 21491 P
160 Screw, mft-tt 3x08 stfzb tx 4822 502 11713 P

5322 466 62077 P

Replacement Parts, Mechanical Parts 7-3

Pos Description Part Number P

161 Screw, mfx-tt 3x08 st fz poz 4822 502 11713 P
164 Screw, mft-tt 4x12 stfzb tx 5322 502 13553 P
166 Screw, mrt-tt 3x08 stfzb tx 4822 502 11691 P
168 Screw, mrt-tt 4x16 stfzb tx 5322 502 13552 P

172 Screw, mft 4x10 st fzb, tx 5322 502 13641 P
176 Screw, rtk-ko st3.5X10 stfz 5322 502 30703 P
180 Spring washer, kba 3.2 St fz din137 4822 530 80173 P

Pos Description Part Number P

182 Spring washer, kba 4.3 St fz din137 4822 530 80076 P
184 Lock washer, yt4.3 St fz din6798a 4822 530 80083 P
190 Nut, m6m 04 st fzb 4822 505 10326 P
200 Receptacle, 140825-2, 2.8X0.8 5322 268 10275 P

201 Protect sleeve 2.8mm N 94610 transppa5322 321 40117 P

202 Cable clip, reel srb-2.5T-m4 5322 358 50107 P

7-4 Replacement Parts, Mechanical Parts

80

Lug bent 15° to lock

Replacement Parts, Mechanical Parts 7-5

Main Board

Pos Description Part No. P

227 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 S

B1 CRYSTAL 12.000 MHz SMD MA-406 2422 543 01353 P

B2 CRYSTAL 10 MHz HC-49U/13 5322 242 82118 P

C1 CAPACITOR-TRIM 0.5-2 pF 300V 5322 124 80335 S

C10 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C100 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C101 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C102 CAPACITOR 33 pF 5% 50V NP0 0805 2222 861 15339 S

C103 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C104 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C105 CAPACITOR 6.80 UF 20% 16V 6.0X3.2 MOLD 5322 124 10687 R

C106 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C107 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C108 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C109 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

C11 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C110 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C111 CAPACITOR 15 UF 20%6.3V 6.0X3.2 MOLD 5322 124 11418 S

C112 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C113 CAPACITOR 82 pF 5% 50V NP0 0805 2222 861 15829 S

C114 CAPACITOR 100 pF 5% 50V NP0 0805 2222 861 15101 S

C115 CAPACITOR-TRIM 3-10 pF TZBX4Z100BB110 5322 125 50306 R

C116 CAPACITOR 47 pF 5% 50V NP0 0805 2222 861 15479 S

C117 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C118 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C119 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C12 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C120 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C121 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C122 CAPACITOR 680 pF 20% 63V NP0 1206 4822 126 12075 S

C123 CAPACITOR 47 pF 5% 50V NP0 0805 2222 861 15479 S

C124 CAPACITOR 100nF 20% 25V X7R 0805 5322 126 13638 S

C125 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C126 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C127 CAPACITOR 1 nF 20% 50V X7R 0805 5322 122 34123 S

C128 CAPACITOR 82 pF 5% 50V NP0 0805 2222 861 15829 S

C129 CAPACITOR 6.8 pF 5% 50V NP0 0805 2222 861 15688 S

C13 CAPACITOR 47 pF 5% 50V NP0 0805 2222 861 15479 S

C130 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C131 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C132 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C133 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C134 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C135 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C136 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C138 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C139 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C14 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C140 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C141 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C142 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C143 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C145 CAPACITOR 390 pF 5% 50V NP0 0805 4822 122 32636 S

C146 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C148 CAPACITOR 470 pF 1% 63V NP0 0805 5322 126 14051 S

C149 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

C15 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C150 CAPACITOR 390 pF 5% 50V NP0 0805 4822 122 32636 S

C151 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C153 CAPACITOR 470 pF 1% 63V NP0 0805 5322 126 14051 S

C154 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

Pos Description Part No. P

C155 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C156 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C157 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C158 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C159 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C16 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C160 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C161 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C162 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C163 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C164 CAPACITOR 2.20 UF 20%6.3V 3.2X1.6 MOLD 5322 124 10685 S

C165 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C166 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C167 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C168 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C169 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C17 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C170 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C171 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C172 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C173 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C174 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C175 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C176 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C177 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C178 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C179 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C18 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C180 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C181 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C182 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C183 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C184 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C185 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C186 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C19 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C2 CAPACITOR-TRIM 2.0-18 pF 300V 2222 809 05217 R

C20 CAPACITOR 1 nF 20% 50V X7R 0805 5322 122 34123 S

C21 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C22 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C23 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C24 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C25 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C26 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C27 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C28 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C29 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C3 CAPACITOR 22 nF 10% 200V X7R 1206 5322 126 14081 R

C30 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C31 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C32 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C33 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C34 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C35 CAPACITOR 470 nF 10% 25V X7R 1210 4822 126 12549 S

C36 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C37 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C38 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C39 CAPACITOR 6.80 UF 20% 16V 6.0X3.2 MOLD 5322 124 10687 R

C4 CAPACITOR 3.3 pF ±0.25pF 50V NP0 0805 2222 861 15338 S

C40 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C41 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

7-6 Replacement Parts, Main Board

Pos Description Part No. P

C42 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C43 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C44 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C45 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C46 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C47 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C48 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C49 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C5 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C50 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C51 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C52 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C53 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C54 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C55 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C56 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C57 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C58 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C59 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C6 CAPACITOR 1 nF 20% 50V X7R 0805 5322 122 34123 S

C60 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C61 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C62 CAPACITOR 2.20 nF PME289MA4220MR04 5322 121 43756 S

C63 CAPACITOR 2.20 nF PME289MA4220MR04 5322 121 43756 S

C64 CAPACITOR 270 µF 20% SMG 400V 25X45 5322 124 80334 S

C65 CAPACITOR 100 nF 20% 250V 2222 336 20104 S

C66 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C67 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C68 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C69 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C7 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C70 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C71 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C72 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C73 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C74 CAPACITOR 68 µF 20% 6.3V SOLID AL 5322 124 10455 S

C75 CAPACITOR 33 µF 20% 63V RADIAL 2M 6.3x11 2222 037 90074 S

C76 CAPACITOR 33 µF 20% 63V RADIAL 2M 6.3x11 2222 037 90074 S

C77 CAPACITOR 10 pF 5% 50V NP0 0805 2222 861 15109 S

C78 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C79 CAPACITOR 33 µF 20% 63V RADIAL 2M 6.3x11 2222 037 90074 S

C8 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C80 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C81 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C82 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C83 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C85 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

C86 CAPACITOR 22 pF 5% 50V NP0 0805 5322 122 32658 S

C87 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C88 CAPACITOR 2.20 UF 20% 6.3V 3.2X1.6 MOLD 5322 124 10685 S

C89 CAPACITOR 100 pF 5% 50V NP0 0805 2222 861 15101 S

C9 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C90 CAPACITOR 100 pF 5% 50V NP0 0805 2222 861 15101 S

C91 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C92 CAPACITOR 15 UF 20% 6.3V 6.0X3.2 MOLD 5322 124 11418 S

C93 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C94 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C95 CAPACITOR 100 nF 20% 25V X7R 0805 5322 126 13638 S

C96 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C97 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C98 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

C99 CAPACITOR 10 nF 20% 50V X7R 0805 5322 122 34098 S

D1 DIODE 0.10A BAT18 35V 1PF SOT23 5322 130 32076 S

D10 DIODE 1A SB140 40V DO41 5322 130 81917 S

Pos Description Part No. P

D12 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D13 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D14 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D15 DIODE BYD17G 400V 1.5A SOD87 9338 122 40701 R

D16 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D17 DIODE BYD17G 400V 1.5A SOD87 9338 122 40701 R

D18 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D19 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D2 DIODE 0.10A BAT18 35V 1PF SOT23 5322 130 32076 S

D21 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D22 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D23 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D24 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D25 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D26 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D3 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D4 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D5 DIODE 0.10A BAV99 SOT23 5322 130 34337 S

D6 DIODE 1A 1N4003/200 DO41 4822 130 31878 S

D7 DIODE 1A SB140 40V DO41 5322 130 81917 S

D8 DIODE 1A SB140 40V DO41 5322 130 81917 S

D9 BRIDGE RECTIFIER 2KBP08 2A 800V 5322 130 50474 S

F1 FUSE HOLDER 011 656 5X20mm 4822 256 30139 S

F1 FUSE 1.6A 5X20 T FST034.3119 4822 253 30024 S

J1 SOLDERING LUG 10.0X15/21 CU SN 4031 100 58390 P

J1 CONNECTOR-COAX BNC 5322 267 10004 S

J10 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J15 CONNECTOR 2 POL F095 SINGLE ROW 5322 265 44074 S

J15 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J16 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J16 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J17 CABLE ASSY 5322 321 60669 R

J18 CONNECTOR 40 POL LOW PROFILE HEADER 5322 265 41051 S

J19 CONNECTOR 16 POL TMH-108-01-L-DW 5322 265 41013 S

J21 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J21 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J22 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J22 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J23 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J23 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J24 CONNECTOR 10 POL 22-03-2101 4030-10A 5322 265 64028 S

J25 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J25 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J29 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J29 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J3 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J30 CONNECTOR 2POL F095 JUMPER GREY 5322 263 50101 S

J30 CONNECTOR 3 POL F095 SINGLE ROW 5322 290 60445 S

J32 CONNECTOR 20 POL LOW PROFILE HEADER 5322 265 51296 S

J4 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J5 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J6 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

J7 CONNECTOR 2 POL F095 SINGLE ROW 5322 265 44074 S

J9 FLAT PIN 2.8mm E184/8 LESA SN BAND 5322 290 34064 S

K1 RELAY REED 5V PRMA-15157-3790 5322 280 20489 R

K2 RELAY REED 5V PRMA-15157-3790 5322 280 20489 R

K3 RELAY REED 5V PRMA-15157-3790 5322 280 20489 R

K4 RELAY TQ2-5 SV/1A 2pol vx 14X9X5m 5322 280 20514 R

K5 RELAY 2p vx V23042-A1003-B101 (alt.A2303) 5322 280 60557 R

L1 CHOKE 220 UH 10% NL453232T-221K 5322 157 61918 S

L10 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L11 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

2422 549 43133 P

2422 549 43133 P

Replacement Parts, Main Board 7-7

Pos Description Part No. P

L12 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L13 CHOKE 4.70µH 5% LQH1N4R7J 2422 535 94048 P

L14 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L15 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L16 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L17 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L18 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L19 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L2 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 P

L20 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L21 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L22 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L23 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 P

L24 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L25 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L3 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 S

L4 FILTER-EMI BLM21A102SPT Z=1Kohm 0.2A

R=0.6ohm

L5 CHOKE 4S2 3.5X6MM BANDAD 80ohm at 100MHz 5322 157 61928 S

L6 CHOKE 10mH B82722-J2102-N1 1A 5322 157 70143 S

L7 CHOKE 10.00µH NEWPORT 18R103 2422 536 00061 P

L8 CHOKE 10.00µH NEWPORT 18R103 2422 536 00061 P

L9 CHOKE 33µH TSL0809-330K1R2 5322 157 53568 S

Q1 TRANSISTOR BF513 .03A20V SOT23 4822 130 60686 S

Q10 TRANSISTOR 0.5A BC807-25 45V SOT23 5322 130 60845 S

Q11 TRANSISTOR 0.5A BC817-25 45V SOT23 4822 130 42804 S

Q12 TRANSISTOR BC847B .1A45V SOT23 4822 130 60511 S

Q13 TRANSISTOR BFG97 0.1A 15V SO223 4822 130 63069 S

Q14 TRANSISTOR BC847B .1A45V SOT23 4822 130 60511 S

Q15 TRANSISTOR BC857B .1A45V SOT23 5322 130 60508 S

Q16 TRANSISTOR BC847B .1A45V SOT23 4822 130 60511 S

Q17 TRANSISTOR 0.5A BC817-25 45V SOT23 4822 130 42804 S

Q2 TRANSISTOR 25 MA BFR92A 20V SOT23 5322 130 60647 S

Q24 TRANSI-NPN SMD BFG16A SOT223 1.5GHz 1W 9340 022 10701 R

Q27 TRANSI-NPN SMD BFG16A SOT223 1.5GHz 1W 9340 022 10701 R

Q28 TRANSISTOR BFT92 25MA 15V SOT23 5322 130 44711 S

Q29 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q3 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q30 TRANSISTOR BFT92 25MA 15V SOT23 5322 130 44711 S

Q31 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q32 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q33 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q34 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q35 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q36 TRANSISTOR BSR12 0.1A 15V SOT23 5322 130 44743 S

Q37 TRANSISTOR BSR12 0.1A 15V SOT23 5322 130 44743 S

Q38 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q39 TRANSISTOR BFS17 .05A 15V SOT23 5322 130 40781 S

Q4 TRANSI-HF N SMD BFR93A 35mA 12V SOT23 5322 130 60705 S

Q5 TRANSISTOR BCP51 1.5A 45V SOT223 5322 130 62639 S

Q6 TRANSISTOR BC847B .1A45V SOT23 4822 130 60511 S

Q7 TRANSISTOR 0.5A BC807-25 45V SOT23 5322 130 60845 S

R1 RESISTOR 47 ohm 1% 0.125W 100PPM 1206 5322 116 80448 S

R10 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R100 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

2422 549 43133 P

Pos Description Part No. P

R101 RESISTOR 4.7 kohm 1% 0.125W 100PPM 1206 4822 051 54702 S

R105 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R106 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R107 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R108 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R109 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R11 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R110 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R111 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R112 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R113 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R115 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R116 RESISTOR 15.0 kohm 1% .125W 100PPM 1206 5322 116 82261 S

R117 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R118 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R119 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R12 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R121 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R122 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R123 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R124 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R125 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R126 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R127 RESISTOR 1.00 Mohm 1% 0.125W 100PPM 1206 4822 051 10105 S

R128 RESISTOR 1.50 kohm 1% 0.125W 100PPM 1206 4822 051 51502 S

R129 RESISTOR 470 ohm 1% .125W 100PPM 1206 4822 051 54701 S

R13 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R130 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R131 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R132 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R133 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R134 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R135 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R136 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R137 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R138 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R139 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R14 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R140 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R141 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R142 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R143 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R144 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R145 RESISTOR 330 ohm 1% .125W 100PPM 1206 4822 051 53301 S

R146 RESISTOR 15.0 kohm 1% .125W 100PPM 1206 5322 116 82261 S

R147 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S
R148 THERMISTOR 16.0 W 20% 3.5A S236/16 5322 116 30457 S

R149 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R15 RESISTOR 150 ohm 1% 0.125W 100PPM 1206 4822 051 51501 S

R150 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R151 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R152 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R153 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R154 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R155 RESISTOR 330 ohm 1% .125W 100PPM 1206 4822 051 53301 S

R158 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R159 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R16 RESISTOR 150 ohm 1% 0.125W 100PPM 1206 4822 051 51501 S

R160 RESISTOR 390 ohm 1% .125W 100PPM 1206 4822 051 53901 S

R161 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R162 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R163 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R164 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R165 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

7-8 Replacement Parts, Main Board

Pos Description Part No. P

R166 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R167 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R168 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R169 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R17 RESISTOR 27.0 ohm 1% .125W 100PPM 1206 5322 116 82262 S

R170 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R171 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R172 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R173 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R174 RESISTOR 330 ohm 1% .125W 100PPM 1206 4822 051 53301 S

R175 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R176 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R177 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R178 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R179 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R18 RESISTOR 68.0 kohm 1% .125W 100PPM 1206 4822 051 56803 S

R180 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R181 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R182 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R183 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R184 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R185 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R186 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R187 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R188 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R189 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R19 RESISTOR 22.0 kohm 1% .125W 100PPM 1206 4822 051 52203 S

R190 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R191 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R193 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R194 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R195 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R196 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R197 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R198 RESISTOR 4.70 kohm 1% .125W 100PPM 1206 4822 051 54702 S

R199 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R2 RESISTOR 100 ohm 1% 0.125W 100PPM 1206 4822 051 51001 S

R20 RESISTOR 8.20 kohm 1% .125W 100PPM 1206 4822 051 10822 S

R200 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R201 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R202 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R203 RESISTOR 560 ohm 1% .125W 100PPM 1206 4822 051 10561 S

R204 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R205 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R206 RESISTOR 5.60 kohm 1% .125W 100PPM 1206 4822 051 10562 S

R207 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R209 RESISTOR 560 ohm 1% .125W 100PPM 1206 4822 051 10561 S

R21 RESISTOR 15.0 ohm 1% .125W 100PPM 1206 4822 051 10159 S

R211 RESISTOR 1.00 Mohm 1% 0.125W 100PPM 1206 4822 051 10105 S

R217 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R218 RESISTOR 680 ohm 1% .125W 100PPM 1206 4822 051 56801 S

R219 RESISTOR 330 kohm 1% .125W 100PPM 1206 5322 117 10969 S

R22 RESISTOR 220 kohm 1% .125W 100PPM 1206 4822 051 52204 S

R220 SENSOR-TEMP KTY82/120 5322 130 10682 S

R222 RESISTOR 180 kohm 1% .125W 100PPM 1206 4822 051 51804 S

R23 RESISTOR 220 kohm 1% .125W 100PPM 1206 4822 051 52204 S

R230 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R233 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R235 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R24 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R241 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R242 RESISTOR 680 ohm 1% 0.125W 100PPM 1206 4822 051 56801 S

R243 RESISTOR 18.0 kohm 1% .125W 100PPM 1206 5322 117 10034 S

R244 RESISTOR 82 ohm 1% .125W 100PPM 1206 4822 051 10829 S

Pos Description Part No. P

R245 RESISTOR 3.90 kohm 1% .125W 100PPM 1206 4822 051 53902 S

R247 RESISTOR 820 ohm 1% .125W 100PPM 1206 5322 116 82264 S

R248 RESISTOR 680 ohm 1% .125W 100PPM 1206 4822 051 56801 S

R249 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R25 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R251 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R252 RESISTOR 100 ohm 1% .125W 100PPM 1206 4822 051 51001 S

R253 RESISTOR 560 ohm 1% 0.125W 100PPM 1206 4822 051 10561 S

R254 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R255 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R258 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R259 RESISTOR 680 ohm 1% .125W 100PPM 1206 4822 051 56801 S

R26 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R260 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R261 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R262 RESISTOR 10.0 ohm 1% 0.125W 100PPM 1206 4822 051 10109 S

R263 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R264 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R265 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R266 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R267 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R268 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R269 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R27 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R270 RESISTOR 8.20 kohm 1% .125W 100PPM 1206 4822 051 10822 S

R271 RESISTOR 820 ohm 1% .125W 100PPM 1206 5322 116 82264 S

R272 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R273 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R274 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R275 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R276 RESISTOR 33.0 kohm 1% .125W 100PPM 1206 4822 051 53303 S

R277 RESISTOR 33.0 kohm 1% .125W 100PPM 1206 4822 051 53303 S

R278 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R279 RESISTOR 8.20 kohm 1% .125W 100PPM 1206 4822 051 10822 S

R28 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R280 RESISTOR 820 ohm 1% .125W 100PPM 1206 5322 116 82264 S

R281 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R282 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R283 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R284 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R285 RESISTOR 33.0 kohm 1% .125W 100PPM 1206 4822 051 53303 S

R286 RESISTOR 33.0 kohm 1% .125W 100PPM 1206 4822 051 53303 S

R287 RESISTOR 0 ohm JUMPER RC-01 1206 4822 051 10008 S

R288 RESISTOR 68 ohm 1% .125W 100PPM 1206 4822 051 10689 S

R288 RESISTOR 33.0 ohm 1% .125W 100PPM 1206 4822 051 10339 S

R289 RESISTOR 220 ohm 1% 0.1W 100PPM 0805 4031 002 22010 S

R29 RESISTOR 22.0 kohm 1% .125W 100PPM 1206 4822 051 52203 S

R290 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R291 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R292 RESISTOR 0 ohm JUMPER RC-01 1206 4822 051 10008 S

R293 RESISTOR 330 ohm 1% .125W 100PPM 1206 4822 051 53301 S

R294 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

R295 RESISTOR 270 ohm 1% .125W 100PPM 1206 4822 051 10271 S

R296 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R297 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R298 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R3 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R30 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R300 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R301 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R302 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R303 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

R304 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R305 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

Replacement Parts, Main Board 7-9

Pos Description Part No. P

R306 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R307 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R309 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R31 POTENTIOMETER 100 kohm 3304X-1-104 5322 101 10841 S

R310 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

R311 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R312 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R313 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R314 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R315 RESISTOR 820 ohm 1% .125W 100PPM 1206 5322 116 82264 S

R316 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R317 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R318 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R319 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R32 RESISTOR 470 kohm 1% .125W 100PPM 1206 5322 116 80447 S

R320 RESISTOR 56 ohm 1% .125W 100PPM 1206 4822 051 10569 S

R321 RESISTOR 10.0 ohm 1% 0.125W 100PPM 1206 4822 051 10109 S

R322 RESISTOR 10.0 ohm 1% 0.125W 100PPM 1206 4822 051 10109 S

R323 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R325 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R326 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R327 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R328 RESISTOR 27 ohm 1% 0.1W 100PPM 0805 4031 002 27090 S

R329 RESISTOR 120 ohm 1% 0.1W 100PPM 0805 5322 117 12506 S

R33 POTENTIOMETER 10 kohm 3304X-1-103 5322 100 11143 S

R330 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R331 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R34 RESISTOR 18.0 kohm 1% .125W 100PPM 1206 5322 117 10034 S

R35 RESISTOR 470 ohm 1% .125W 100PPM 1206 4822 051 54701 S

R36 RESISTOR 470 ohm 1% .125W 100PPM 1206 4822 051 54701 S

R37 RESISTOR 1.50 kohm 1% 0.125W 100PPM 1206 4822 051 51502 S

R38 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R39 RESISTOR 10 MOHM 10% 0.25W RC-01 1206 4822 051 10106 S

R4 RESISTOR 220 kohm 1% .125W 100PPM 1206 4822 051 52204 S

R40 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R41 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R42 RESISTOR 15.0 ohm 1% .125W 100PPM 1206 4822 051 10159 S

R43 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R44 RESISTOR 47 ohm 1% .125W 100PPM 1206 5322 116 80448 S

R45 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R46 RESISTOR 150 ohm 1% 0.125W 100PPM 1206 4822 051 51501 S

R47 RESISTOR 150 ohm 1% 0.125W 100PPM 1206 4822 051 51501 S

R48 RESISTOR 82 ohm 1% .125W 100PPM 1206 4822 051 10829 S

R49 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R5 RESISTOR 220 kohm 1% .125W 100PPM 1206 4822 051 52204 S

R50 RESISTOR 8.2 ohm 10% 0.25W RC-01 1206 4822 051 10828 S

R51 RESISTOR 2.70 kohm 1% .125W 100PPM 1206 4822 051 52702 S

R53 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R54 RESISTOR 560 ohm 1% .125W 100PPM 1206 4822 051 10561 S

R55 RESISTOR 560 ohm 1% .125W 100PPM 1206 4822 051 10561 S

R56 RESISTOR 390 ohm 1% .125W 100PPM 1206 4822 051 53901 S

R57 RESISTOR 15.0 kohm 1% .125W 100PPM 1206 5322 116 82261 S

R58 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R6 RESISTOR 47 ohm 1% .125W 100PPM 1206 5322 116 80448 S

R60 RESISTOR 4.70 kohm 1% .125W 100PPM 1206 4822 051 54702 S

R61 RESISTOR 220.0 ohm 1% .125W 100PPM 1206 4822 051 52201 S

R63 RESISTOR 6.80 kohm 1% .125W 100PPM 1206 4822 051 10682 S

R64 RESISTOR 1.00 kohm 1% 0.125W 100PPM 1206 4822 051 51002 S

R65 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R66 RESISTOR 4.70 kohm 1% .125W 100PPM 1206 4822 051 54702 S

R67 RESISTOR 2.20 kohm 1% .125W 100PPM 1206 4822 051 52202 S

R69 POTENTIOMETER 100 kohm 3304X-1-104 5322 101 10841 S

R7 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R70 POTENTIOMETER 100 kohm 3304X-1-104 5322 101 10841 S

Pos Description Part No. P

R71 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R72 RESISTOR 100 kohm 1% 0.125W 100PPM 1206 4822 051 51004 S

R73 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R74 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R75 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R76 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R77 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R78 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R79 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R8 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R80 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R81 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R82 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R83 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R84 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R85 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R86 RESISTOR 10.0 kohm 1% 0.125W 100PPM 1206 4822 051 51003 S

R87 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R88 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R89 RESISTOR 68 ohm 1% .125W 100PPM 1206 4822 051 10689 S

R9 RESISTOR 120 ohm 1% 0.125W 100PPM 1206 4822 051 10121 S

R90 RESISTOR 68 ohm 1% .125W 100PPM 1206 4822 051 10689 S

R91 POTENTIOMETER 100ohm CVR-4A-101 5322 101 10989 S

R92 RESISTOR 8.20 kohm 1% .125W 100PPM 1206 4822 051 10822 S

R93 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R94 RESISTOR 47 ohm 1% 0.1W 100PPM 0805 5322 117 12505 S

R95 RESISTOR 3.30 kohm 1% .125W 100PPM 1206 4822 051 53302 S

R96 RESISTOR 1.80 kohm 1% .125W 100PPM 1206 4822 051 10182 S

R98 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

R99 RESISTOR 100 ohm 1% 0.1W 100PPM 0805 5322 117 12497 S

U1 IC-OP AMP CA3140AM CA3140 AM BIMOS SO8 9322 114 39682 R

U10 IC-ANA TL7705BCD SMD LOW VOLT DETECT 5322 209 90426 R

U11 IC MICROP N80C196KB10 5322 209 52203 R

U12 IC-PROM 24LC16B 16kBIT I2C SMD SO8 9322 186 14682 P

U13 IC PC74HC574T SO20 4822 209 60451 S

U14 IC PC74HC573T SO20 5322 209 60424 S

U15 IC PC74HC02T SO-14 5322 209 71563 S

U16 IC PC74HC573T SO20 5322 209 60424 S

U17 IC PC74HC573T SO20 5322 209 60424 S

U18 IC PC74HC21T SO14 5322 209 60437 S

U19 IC PC74HC00T SO14 5322 209 71802 S

U2 IC PC74HC574T SO20 4822 209 60451 S

U20 IC PC74HC138T SO16 5322 209 73178 S

U21 IC NE532D DUAL SO-8 5322 209 71553 R

U22 IC-SRAM TC55257DFL-85L SOP28 32Kx8 9322 106 65682 R

U23 IC-PROM PM6685 27C512 5322 209 31776 P

U23 IC SOCKET 32 POL P/N 213-032-602 5322 255 41141 S

U24 IC PC74HC32T SO14 4822 209 63475 S

U25 IC PC74HC32T SO14 4822 209 63475 S

U26 IC-CMOS 74HC10 SO14 SO-14 9337 142 80653 S

U27 IC-DIG ECL 100331QC 3XDFLIP-FLOP PCC28 5322 209 33604 S

U28 IC-BUS TRANSCEIV 75ALS176D SO-8 SMD 5322 209 33171 R

U29 IC-ASIC 5322 209 90513 R

U3 IC PC74HC4353T SO20 4822 209 62805 S

U30 IC PC74HC00T SO14 5322 209 71802 S

U31 IC-OMV ADC 10BIT ADC1061C1WM SO20 9322 187 55682 R

U32 IC PC74HC573T SO20 5322 209 60424 S

U34 IC PC74HC00T SO14 5322 209 71802 S

U35 IC-OMV ADC 10BIT ADC1061C1WM SO20 9322 187 55682 R

U36 IC PC74HC573T SO20 5322 209 60424 S

U38 IC NE532D DUAL SO-8 5322 209 71553 S

U39 POWER MODULE 5322 693 22828 R

U4 IC 8 BIT PM7528HPC PLCC20 4822 209 62803 S

U40 IC HEF4013BT SO14 5322 209 14477 S

7-10 Replacement Parts, Main Board

Pos Description Part No. P

U41 INSULAT.PLATEP TO220 CLIP Sil-Pad 400AC 5322 466 61813 P

U41 CLAMP TO220 5322 401 11257 P

U41 IC 12V LM2940CT-12 TO220 4822 209 62085 S

U43 INSULAT.PLATEP TO220 CLIP Sil-Pad 400AC 5322 466 61813 S

U43 CLAMP TO220 5322 401 11257 P

U43 IC 1.50 A LM337T TO-220 5322 209 81236 S

U44 IC-CMOS 74HC125 SMD SO14 9337 569 90701 S

U5 IC NE532D DUAL SO-8 5322 209 71553 S

U50 IC-COMP MAX961 SO8 4.5ns 9322 194 34682 R

U6 IC NE532D DUAL SO-8 5322 209 71553 S

U7 IC NE532D DUAL SO-8 5322 209 71553 S

U8 IC-COMP AD96687BP PLCC20 4822 201 62795 R

U9 IC-DIG ECLIPS MC10E104 4822 209 31775 R

Replacement Parts, Main Board 7-11

Front Board

Pos Description Part Number P

5 Connector row, SG0.25x100x6.0x3.0 5322 267 70294 R
7 LCD Display 5322 214 91033 R

10 LCD bezel 4031 100 62820 R
11 Backlight-LED 5322 130 82201 R
14 Window LCD 5322 381 11136 P
16 LED spacer, LEDS1E-3-01 for led 5322 255 41228 P
20 Rubber keypad 4031 100 62720 R

32 Screw, RX-PT Z 2-28X8 FZB 4822 502 30081 P
C201 Capacitor 10 nF 20% 50V X7R, 0805 5322 122 34098 S
C202 Capacitor 10 nF 20% 50V X7R, 0805 5322 122 34098 S
D201 LED 3 mm HLMP-1300 red 5322 130 81921 R

Pos Description Part Number P

D202 LED 3mm Yellow 590nm

4-8MCD/10mA
P204 Connector 40 POL TMH-120-01-L-DW 5322 265 51295 P
R201 Resistor 220 k 1% .125W 100PPM

1206
R204 Resistor, 10.0 W 1% 0.125W 1206 4822 051 10109 S
R205 Resistor, 10.0 W 1% 0.125W 1206 4822 051 10109 S

R206 Resistor, 10.0 W 1% 0.125W 1206 4822 051 10109 S
R207 Resistor, 10.0 W 1% 0.125W 1206 4822 051 10109 S
U201 IC, PCF8576T, VSO56 5322 209 11129 R
U202 IC, PCF8576T, VSO56 5322 209 11129 R

TORQU E 3 Nc m

TIGHTEN THIS SCREW FIRST TO GUIDE LCD HOLDER

4822 130 30953 R

4822 051 52204 S

ORIENTATION MARK FOR LCD

7-12 Replacement Parts, Front Board

GPIB Interface (PM9626B)

Pos Description Part Number P

Connector, KC-79-35 5322 267 10004 S
IC-Socket, 40pin, DIL 5322 255 44217 S
Lock Washer, YT3.2 ST FZ DIN6798A 4822 530 80082 P
Screw, MRT-KOMBI 3X08, STFZ 5322 502 21489 P

Screw, MRT-KOMBI 3X10, STFZ 5322 502 21644 P
Spring Washer, KBA 3.2 ST FZ

DIN137
BU101 Cable Assy 5322 321 61341 P
BU103 Connector 24pin

57LE-20240-77OOD35G
C101 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C102 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C103 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C104 Capacitor 220 pF 5% 50V NP0 0805 4822 122 33575 S

C105 Capacitor 100 nF 10% 63V X7R 1206 4822 122 33496 S
C106 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C107 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C108 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C109 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C110 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C111 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C112 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C113 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C114 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S

C115 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C116 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C117 Capacitor 10 nF 20% 50V X7R 0805 5322 122 34098 S
C118 Capacitor 68 mF 20% 6.3V SOLID AL 5322 124 10455 S
IC101 IC PC74HC32T SO14 4822 209 63475 S
IC103 IC NE532D DUAL SO-8 5322 209 71553 R

IC106 IC PC74HC00T SO14 5322 209 71802 S
IC107 IC PC74HC573T SO20 5322 209 60424 S
IC108 IC PC74HC573T SO20 5322 209 60424 S
IC109 IC socket 32pin P/N 213-032-602 5322 255 41141 S
IC109 IC-PROM PM9626B 5322 209 51853 R

IC111 IC-SRAM TC55257DFL-85L SOP28

32Kx8

IC113 IC-DIG UPD7210D IEC BUS GPIB

CONTROLLER
IC114 IC SN75160AN 5322 209 81807 R

IC115 IC SN75161AN 5322 209 81842 R
IC116 IC PC74HC573T SO20 5322 209 60424 S
IC117 IC PC74HC86T SO-14 5322 209 71562 S
R101 Resistor 47 k 1% 1/8W 100PPM 1206 5322 116 80446 S
R102 Resistor 47 k 1% 1/8W 100PPM 1206 5322 116 80446 S

R103 Resistor 4.7 k 1% 1/8W 100PPM 1206 4822 051 54702 S
R104 Potentiometer 1k 3304X-1-102E 5322 101 11095 S
R105 Resistor 10 k 1% 1/8W 100PPM 1206 4822 051 51003 S
R106 Resistor 330 1% 1/8W 100PPM 1206 4822 051 53301 S
R107 Potentiometer 10 k 25% 0.1W

3304X-1-103
R108 Resistor 3.3 k 1% 1/8W 100PPM 1206 4822 051 53302 S

R109 Resistor 100 1% 1/8W 100PPM 1206 4822 051 51001 S
R110 Resistor 100 1% 1/8W 100PPM 1206 4822 051 51001 S
R111 Resistor1k1%1/8W 100PPM 1206 4822 051 51002 S
R112 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S
R113 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S

4822 530 80173 P

5322 267 60148 P

9322 106 65682 R

9322 023 60682 R

5322 100 11143 S

Pos Description Part Number P

R114 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S
R115 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S
R116 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S
R117 Resistor 100 k 1% 1/8W 100PPM 1206 4822 051 51004 S

SK101 DIP switch 6-p 206-6 RAST 5322 277 21125 R

Replacement Parts, GPIB Interface (PM9626B) 7-13

This page is intentionally left blank.

7-14 Replacement Parts, GPIB Interface (PM9626B)

Chapter 8

Drawings & Diagrams

How to read the diagrams

Inside the symbol, at the top is an abbreviated description of the cir
cuit’s function.

-

This chapter contains circuit diagrams and component layout.

Each diagram has been completed with lists of the ICs used in the
unit. This list indicates the connections that are not shown in the dia
gram, such as GND and supply voltages.

Signals

The signals in these units are named after what they do, e.g.,
LEAD-EDGE isused ascontrol currentto the leading edge circuits.

Two different types of arrows are used to mark references for contin
ued connection somewhere else in the diagram.

This arrowis usedif thereference isdirected toa point
located on the same page.

A1

This arrowis usedif thereference isdirected toa point

/1.A1

located on another page. The example means that the
point is on sheet 1, coordinate A1.

Circuit symbols

The circuit diagrams are computer drawn. The symbols conform to
the IEC standards. These symbols are designed to be logical and easy
to read.

Pin numbers are written outside the symbol and, if it is a complex cir
cuit, the pin functions are written inside.

-

A small circle on a pin indicates that the input/output inverts the sig
nal.

The component name is written below the symbol.

The signal flow through the circuit is always from left to right.

-

-

Resistors, capacitors, diodes, transistors

-

and other components.

These components are similar to the old fashioned, hand-drawn sym
bols.

They have their component number above and their value or compo
nent name below.

A resistor contained in a resistor network has a frame drawn around it
and one of the pin numbers is written to the left or below it.

-

-

Component numbers

“R305" is a typical component number. The ”R" indicates that it is a
resistor,"3" that it is positioned on the “unit 3", and 05 that it is the
fifth resistor in the component list for that unit.

The component number is written above the symbol.

Drawings & Diagrams 8-2

This page is intentionally left blank.

Drawings & Diagrams 8-3

Main PCB, Component layout

8-4 Drawings & Diagrams

Top View

Control Logic, PCB 1, sheet 1(5)

+5CPU

R160

390

TMH-108- 01-L-DW

TO PRESCALER

LO BATT

BACKLIGHT

TO DISPLAY/

KEYBOARD

+12VREG /BATT

R179

Con40

U+12V

10K

J19

J17

-5.2V

+7V

8
7
2

C88

2.2uF-6.3V

J30

1

1
2
3
4

5
6
7
8
9
10
11
12
13
14
15
16

+5V

R172
10K

1
2
3
4
5
6
7
8
9
10
11

12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

27
28
29
30
31
32
33
34
35
36
37
38
39
40

R159

10K

U10

RESET

VCC
SENSE

RESET
RESIN
CT3GND

TL7705B

3

2

TEST

R201

10K

+5V

C
+12V

BURST

-5.2V

R199

10K

+5V

R170

R171

2.2K

2.2K

+5V

+5V

U+12V

ON

STANDBY

+5V

5
6
1

REF

4

+5V

R200
10K

R169
100K

-5.2V

+7V

U+12V

+12VREG /BATT

R173
10K

1
2

3
4
5
6
7
8

9
10
11
12
13
14
15
16

17
18
19
20
21
22
23
24
25
26
27
28
29
30

31
32
33
34
35
36
37
38
39
40

J18

Con40

12MHZ

GET

TO GPI B

AR[0-7]

AD[0-15]

ALE

RD

WRL

DISABLE STANDBY

ENA-EXT-REF

A8

CSRLY

DACMUX

CSIB

CSIA

CSDAC

CSASIC

+5V

R195

C89

U15D

HC02

R205

56

100p

9

A0
A1
A2
A3
A4
A5
A6

A7
A8
A9
A10
A11
A12

+5V

A0
A1
A2

A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14

U26A

12

&

HC10

L10

BLM21A102S

15uF-6.3V

10
11

10

9
8
7
6
5
4

3
25
24
21
23

2
26

1

22
27
20

11
10

9

8

7

6

5

4
29

28
24
27

3
30
31

2

23
25

1
2
13

C92

13

1

C101
100nF

R191

B1

+5CPU

1

R164
100K

VCC

U11

CPU

ADR

DATA

80C196KB

1

A0

2

A1
A23WP

5

SDA

6

SCL

R165
100K

C85
22p

U12A

24LC16B

EEPROM

C86

22p

C87100nF

+5V

+5V

+5V

+5V

FIN

+5V

Q15

BC857B

R175
10K

67
16

2

3
12
13

37
43

64

6

5

7

4
11
10

8

9

19
20

21
22
23
30
31
32

18
17
15
44
42
39
33
38

68
36

12MHz

XTAL1
RESET
EA
NMI
AGND
VREF

VPP
READY

BUSWIDTH

ACH0/P0.0
ACH1/P0.1
ACH2/P0.2
ACH3/P0.3
ACH4/P0.4
ACH5/P0.5
ACH6/P0.6
ACH7/P0.7

P1.0
P1.1

P1.2
P1.3
P1.4
P1.5
P1.6
P1.7

TDX/P2.0
RDX/P2.1
EXTINT/P2.2
T2CLK/P2.3
T2RST/P2.4
PWM/P2.5
P2.6
P2.7

VSS
VSS

GATE IND.

R174
330

R162
100K

R163
100K

R161
100K

+5V

R158

120

XTAL2

CLKOUT

WR/WRL

BHE/WRH

ALE/ADV

AD0/P3.0
AD1/P3.1
AD2/P3.2
AD3/P3.3
AD4/P3.4
AD5/P3.5
AD6/P3.6
AD7/P3.7
AD8/P4.0
AD9/P4.1

AD10/P4.2
AD11/P4.3
AD12/P4.4
AD13/P4.5
AD14/P4.6
AD15/P4.7

HSI.0

HSI.1
HSO.4/HSI.2
HSO.5/HSI.3

HSO.0
HSO.1
HSO.2

HSO.3

R166
100K

INST

7

56

66
65

40
41

61

RD

62

63

AD0

60

AD1

59

AD2

58

AD3

57

AD4

56

AD5

55

AD6

54

AD7

53

AD8

52

AD9

51

AD10

50

AD11

49

AD12

48

AD13

47

AD14

46

AD15

45

24
25
26
27

28
29
34

35

14

VSS

R167

R168
100K

100K

2

AD0

AR0

CARRY 2

J11

J12

TEST SIGN ALS

Q16

BC847B

+5V

C91

15uF-6.3V

1

J29

RESET

3

R182
56

J13

+12VREG/BATT

19
18
17
16
15

14
13
12

2
3
4

5
6
7
8
9

1

11

R181

56

AD1

R183
56

AR1

AD[0-15]

CARRY1

J14

STAND BY IND.

+5V

R202
10K

U13A

OE

C1

Q0

D0

Q1

D1

Q2

D2

Q3

D3

Q4

D4

Q5

D5

Q6

D6

Q7

D7

HC574

U14A

D0

Q0

D1

Q1
Q217D2

D3

Q3

D4

Q4

D5

Q5
Q6

D6

Q712D7

OE
C1

HC573

VCC20GND

10

R203
560

U16B
HC573

AD2

AR2

R204

2.2K

6MHz

R180

R178

56

R177

56

56

AD4

AD3

R185

AR3

AR0
AR1
AR2
AR3

C94
100nF

R186

56

56

AR4

AR[0-7]

AR0
AR1
AR2
AR3
AR4
AR5
AR6
AR7

CSKEYBO

U17B
HC573

VCC20GND

10

R184
56

1
11

2
3
4
5
6

7
8
9

19
18

16
15
14
13

WRL

RD

ALE

R176

INST

56

AD7

AD6

AD5

R187

R188
56

AR6

R193

56

CSKEYBOARDIN

28

GND14VCC

8

14

U22B
55257

R189
56

AR7

2

D0

3

D1

4
5

D3

6

D4

7

D5

8

D6

9

1

OE

11

C1

HC573

2

D0

3

D1

4
5

D3

6

D4

7

D5

8

D6

9

1

OE

11

C1

HC573

U12B
24LC16B

VCC

GND

4

U19E

HC00

VCC

GND

7

56

AR5

AD0
AD1
AD2
AD3
AD4
AD5
AD6

AD7

AD8 A8
AD9
AD10

AD11
AD12
AD13
AD14
AD15

WAITSTATE

+5V

20

U14B
HC573

VCC

GND

10

ARDOUT

C95
100nF

8

U16A

U17A

+5V

U15C

U19C

&

HC00

U19D

&

HC00

1
2
3

4
5
6

C99
10n

A[0-15]

U20A

A0
A1
A2

E1A
E2A

E3

HC138

8

1

9

HC02

CSROM

8

CSRAM

11

15

Y0

14

Y1

13

Y2

12

Y3

11

Y4

10

Y5

9

Y6

7

Y7

U15E
HC02

VCC14GND

7

U15A

2

1

3

HC02

AR[0-7]

A0

19

Q0
Q1
Q217D2
Q3
Q4
Q5
Q6
Q712D7

Q0
Q1
Q217D2
Q3
Q4
Q5
Q6
Q712D7

U18B

&

HC21

C96
10n

A1

18

A2
A3

16

A4

15

A5

14

A6

13

A7

19

A9

18

A10
A11

16

A12

15

A13

14

A14

13

A15

+5V

9
10

12
13

20

U13B
HC574

VCC

GND

10

14

U24E
HC32

VCC

GND

7

U23B
27C51

2-90

VCC32GND

16

R190

1

56

RAM/ROM

U19A

1

A14

+5V

A15

A14
A15

+5V

A13

A9
A10
A11

A13

U20B

C97

HC138

VCC16GND

10n

8

3

&

2

HC00

U19B

4

&

5

HC00

U18A

1
2

&

4
5

HC21

C98
10n

9

10

6

6

12

13

+5V

U18C
HC21

VCC14GND

7

10

BUSWIDTH

C100
100nF

11

12

CSGPIB

U26D
HC10

VCC14GND

7

R194
10K

U26C

&

HC10

U22A

A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12

A13
A14

OE
R/W
CE

55257

U23A

A0
A1
A2
A3
A4
A5
A6
A7
A8

A9
A10
A11
A12
A13
A14
A15

CE
OE/VPP

27C512-90JC

C93
100nF

8

11

I/O1

12

I/O2

13

I/O3

15

I/O4

16

I/O5

17

I/O6

18

I/O7

19

I/O8

13

O0

14

O1

15

O2

18

O3

19

O4

20

O5

21

O6

22

O7

CSKEYBOARD

C90

100p

+5CPU

RD

10K

+5V

-5.2V
+7V

AD15
AD14
AD13
AD12
AD11
AD10

AD9
AD8

AR7
AR6
AR5
AR4
AR3
AR2
AR1
AR0

+5V

AD0
AD1
AD2
AD3
AD4
AD5
AD6

AD7

A8

U24A

WRL

1

3

1

2

AD0
AD1
AD2

AD3
AD4
AD5
AD6
AD7

HC32
U15B

5

4

1

6

HC02
U24B

4

6

1

5

HC32
U24C

9

8

1

10

HC32
U24D

12

11

1

13

HC32
U25A

1

3

1

2

HC32

U26B

3
4

6

&

5

HC10

Drawings & Diagrams 8-5

Main PCB, Component layout

K1

K2

K3

K4

+

--

8-6 Drawings & Diagrams

Bottom View

Counter Circuits, PCB 1, sheet 2(5)

C

External
control
input
(rear panel)

ENA-EXT-REF

External
referenc e
input
(rear panel)

R330
47

R235
120

C123
47p

J26
BNC-Coax

J28
BNC-Coax

A

AN

-2ECL

C178

100nF

Q36
BSR12

R319
56

R321
10

R247

R252

100

C138

10n

-5ECL

820

+5ECL

R313
56

BSR12

C182
100nF

R261
100

C107

10n

Q24
BFG16A

Q27
BFG16A

+12VREG/BATT

R262
10

+5V

R52

Not used
R97

Not used

D15
BYD17G

R255

100

R258

100

D17
BYD17G

C124
100n

C133

J24

OPTIONAL OSCILLATOR

1
2
3
4
5
6
7
8
9

10

4030-10A

PXB
PXA
SXB
SXA

FIN

CARRY 1

CARRY2

AR[0-7]

AD[0-15]

2.2uF-6.3V
C125

J27

C130

100nF

100n

BNC-Coax

2.2uF-6.3V
C132

Internal
reference
output
(rear panel)

STD

ALE

WRL

RD

-5.2V

-2.1V

C141
10n

Oscillator
selection

C131

100nF

+5ECL

C142
100nF

C117
100nF

OPT

3

4

5

9

10

BLM21A102S

BLM21A102S

2

+5M

R208
Not used

U25B

HC32

U25C

HC32

L22

L21

C143
100nF

J23

-5.2V

1

R209
560

C113
82p

R51

2.7K

6

1

8

1

C109

C115

3-10pF

R218
680

22p

R220
1K

R233

47

C186
15uF-6.3V

C185
15uF-6.3V

B2

10MHz

C122
680pF

+5M

Oscillator
selection

R217
100

C120

10p

12

13

C121
100nF

C184
100nF

C116
47p

U25D

HC32

C114
100p

R230

100

1

1

C119
10n

-5ECL

-2ECL

1

VCC

VEES8VEES15VEES

STD

OPT

J25

3

2

R211

-5.2V

21
25
24
23

18

1

VCC

COUNTER CIRCUIT

GND

R244
82

L13

4.7uH

C102
33pF

U27C

S

Q
Q

1D
C1
R

100331

C110
100 nF

26
27

1M

+5M

83

RTCX2

82

VBAT

46

X2

52

PH2

43

MTCXO

48

EXTREF

12MHZ

+5M

R219
330K

R222

+5M

180K

GET

BURST

11

2

12

MS

16

MR

VCCA

U27D
100331

VEE

22

14

-5ECL

29

MPCLK

41

V+REFO

39

V-RE FO

54

V+REFA

56

V-RE FA

58

V+REFB

60

V-RE FB

88

VREFAD

87

IRES

36

VCCN

47

VCCB

50

VCCC

57

VCCE

71

VCCD

85

VCCG

93

VCCA

38

GNDA

44

GNDB

53

GNDC

61

GNDE

67

GNDD3

69

GNDD2

73

GNDD1

75

GNDD4

86

GNDG

37

GET

72

A

74

A2

68

B2

70

B

66

SR

76

EXTC

65

P

64

BURST

27

CS

26

ALE

23

WRL

24

WRH

25

RD

99

HLDA

28

+5M

-5ECL

QDMA

-5ECL

U29

57370

+5V

L16

BLM21A102S

C128
82p

L11

BLM21A102S
C111
15uF-6.3V

OUTMUX

INTREF

RTCX1
ALARM

X1

PH1

OTRIM

VOUTA
VOUTB

INTP1
INTP2
INTS1
INTS2

FIN

MTIME

CY1
CY2

TRA
TRB

PG

C1
C2
C3

C4
S1
S2
S3
S4
S5

INT

HOLD

A16
A17
A18

A19

AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
AD8

AD9
AD10
AD11

AD12
AD13
AD14
AD15

L12

BLM21A102S

R250
Not used

C127

1n

+5V

84
81

45

51

49
42
40

55
59

89
90
91
92

94
96
97
98

62
63

30

80

79

78

77

31

32

33

34

35

95
100

19

20

21

22

2
3
4
5
6
7
8
9
10
11
12
13

14
15
16
17

R245

3.9K

R259
680

C134
10n

AR0
AR1
AR2
AR3
AR4
AR5
AR6

AR7
AD8
AD9
AD10
AD11
AD12
AD13
AD14
AD15

R254

10K

R251
1K

D18

BAV99

TP28

R249

47

R260

47

+5ECL

C175

100nF
R296
220

R298

47

R300

47

R302

R301

100

100

C177
100nF

BFS17

R314
120

R310
27

R327
100

-2ECL -2ECL

R306
220

Q35

+5ECL

C180

100nF
R317
220

R323

47

R325

47

C36
100nF

BLM21A102S

R264
220

R267

100

Q38

BFS17

BFS17

R329

120

R328
27

C183

100nF

-5ECL

L14

C144
Not Used

R307

R309

U27B

+5ECL

R305
220

Q34

47

47

U28

BFS17

C179

100nF

-5ECL

3

Q

4

Q

R326

100

-2ECL-2ECL

U50

1
2
3
4

8

EN

EN

+IN

-IN
SHDN
LE

3
4

2
1

MAX961

C77
10p

8

VCC

7

QN

6

Q

5

GND

R243

18K

U27A

11

6

S

Q

5

7

Q

1D

9

C1

10

R

100331

R312

R311

100

100

R315
820

D19
BAV99

D14
BAV99

R316

2.2K

D16
BAV99

-2ECL -2ECL

-5ECL

R268
1K

17

S

18

1D

19

C1

20

R

100331

+5V

R241
10K

R242

680

C135

10n

6
7

5

75ALS176D

+5ECL

+5ECL

R101

4.7k

R263

1K

R265

1K

C129

R331

47

C181
10n

R320
56

R322
10

R248

680

R253
560

6.8p

R266
1K

Q37

Q32
BFS17

C176

100nF

R318
220

Q39

+5V

BLM21A102S

-5ECL

R297
220

Q33

BFS17

R304
120

R303
27

CSASIC

+5V

L15

BLM21A102S

U25E

VCC14GND

HC32

7

L17

C139
15uF-6.3V

C140
10n

C136
15uF-6.3V

Drawings & Diagrams 8-7

This page is intentionally left blank.

8-8 Drawings & Diagrams

Input Amplifier & Trigger Level DACs, PCB 1, Sheet 3(5)

CSRLY

CSDAC

AR[0-7]

DACMUX

WRL

A8

J1

MiniCoax-3

DACMUX

J8

Not used

100K

Q11
BC817-25

U6C
NE532D

470K

+5

C7

R35

10n

470

C4

3.3pF

R36
470

-5.2

C5

R33

10K

10n

185

U1A

2

-

6

+

3

3140

R32

C25
10p

U6A

2

-

3

+

NE532D

C26
10p

U6B

6

-

5

+

NE532D

8

U7C

V+

NE532D

V-

4

D3
BAV99

C810n

D1
BAT18

C13

47p

D2
BAT18

C9
10n

D4
BAV99

R34

18K

-5.2

R37

1.5K

C6

R38

1K

1n

-5.2

+5

R69

100K

1

7

+5V

-5.2

R70

100K

20

U2B

VCC

HC574

GND

10

C2710n

+5

-5.2

C28
10n

R73

10K

R71

100K

R80

10K

R72

100K

C10
10n

R39
10M

R40
47

+7 +5

R42
15

Q1
BF513

R100

27

Q3
BFS17

R41
220

-5.2

R74

10K

R75

10K
R76

10K

R77

10K

R89
68

R81

10K

R82

10K

R83

10K

R84

10K

R90
68

+5

R43

C11

100

10n

Q2
BFR92A

C80
10n

R44

47

R105
1K

-5.2
R46
150

R45

47

D5

BAV99

C14

R47

10n

150

-5.2

R78

R79

10K

10K

U7A

2

-

1

3

+

NE532D

R85

R86

10K

10K

U7B

6

-

7

5

+

NE532D

11

VCC

-5.2L

Q13
BFG97

Q4
BFR93A

R87

100

R88

100

U9F

16

21

20

F1

VCC0

VCC0

19

F2

VEE

10E104

1

C16

C12

15uF-6.3V

10n

C20

1n

9

7

U8C
AD96687BP

-5.2

R50

8.2

L1

220uH

R49
100

C17

C18

10n

10n

25
26 15

10E104

C49

U9D

TP10

10n

14

&

+7V

K4B

8

R48

C15

82

10n

C29

100nF

C30
100nF

+5

14

VCC

GND

VEE8GND

4

18

2

4

C19
10n

TP11

R115
10K

R116
15K

L2

4S2 3.5X6MM

C37
100nF

TP26

TP27

U8A

5

LE

7

LE

10

2

+

OUT

3

9

-

OUT

AD96687BP

K4A

3

C31
10n

C32
10n

17

LE

15

LE

12

+

13

-

AD96687BP

R114

R106
100

J2

+5V

C55

100nF

U5B

6

-

7

5

+

NE532D

R117

47

-5.2

-5.2V

100nF

C38
10n

U8B

C40

OUT
OUT

C44
10n

R91
100

20

19

R107

100

L5

4S2 3.5X6MM

Q10
BC807-25

R118
47

L3

4S2 3.5X6MM

6.8u-16V

+5

R92

8.2K

R93
47

R94
47

R95

3.3K

R96

1.8K

-5.2

-2.1

C56
10n

C51
10n

+7

C39

-2.1

C33
10n

C34
10n

R109

R110

C41
10n

100

100

R108
100

27
28 13

10E104

-2.1

-2.1 -2.1-2.1

C59
10n

C52

10n

U9C

12

&

-2.1

R98
Not used

R111

C43
10n

100

R112
100

C53
10n

-2.1

2
3 10

4
5 8

C60
100nF

U9B

&

10E104

U9A

&

10E104

C54
10n

BLM21A102S

BLM21A102S

C46
10n

9

7

C61

15uF-6.3V

4S2 3.5X6MM

L4

L25

C45
100nF

U9E

23
24 18

&

10E104

R113

100

L24

BLM21A102S

L23

C126
10n

17

-2.1

BACKLIGHT

+5

+5D

-2.1V

-2.1

C50

2.2uF-6.3V

-5.2L

(U16)

C48
10n

-5.2D

-5.2

C47
15uF-6.3V

A

AN

R99
Not used

K2A

81
714

REED

C1

0.5-2pF

R13
120

R14
120

2613

R3

470K

R15
150

R16
150

C23

K1B

10n

REED

C24
10n

U2A

1

OE

11

C1

D0
D1
D2
D3
D4
D5
D6
D7

HC574

LE

S0
S1

S2

E2
E1

A0

A1
B0

B1
C0

C1

HC4353T

U3

VCC

GND

ACOM

BCOM

CCOM

19

Q0

18

Q1

17

Q2

16

Q3

15

Q4

14

Q5

13

Q6

12

Q7

AR[0:7]

20

9

VEE

10

18

19

5

2
3
4
5
6
7
8
9

11

15
13

12

8
7

16

17

2

1
6

4

R1

47

817

K1A
REED

14

R7

R9

120

120

R8

R10

120

120

CSRLY

AR0
AR1
AR2

R2

100

R11
120

R12
120

R1727

C21

10n

C22
10n

AR0
AR1
AR2
AR3
AR4
AR5

AR6
AR7

+5D

R4

220K

2613

K2B
REED

R6

47

R5

220K

+5

-5.2D

C42
10n

2

3

R21

15

R22

220K
R18
68K

817

REED
K3A

14

R19
22K

R20

8.2K

2613

C66

10n

C67
10n

+5D

C58

10n

U5A

-

1

+

NE532D

K3B
REED

C2

2-18pF

R23

220K

C68

10n

WRL

A8

AR0
AR1
AR2
AR3
AR4
AR5

AR6
AR7

1

10

15
16

6

14
13
12
11
10

9
8
7

4

18

R24
470K

R25
470K

R26
470K

K4C

C69
10n

R119

1K

Not used

CS
WR
DACA/DACB

D0
D1
D2
D3
D4
D5
D6
D7

VREF A

VREF B

C3

22nF

R120

U4

PM7258

470K

AGND

RFB A

OUT A

RFB B

OUT B

R29
22K

R30

GND

R27
470K

R28
470K

R31

+5D

17

VCC

5

1

3

2
19

20

TRIG LEVEL DAC'S

DAC RANGE REFERENCE

+5

0.22V

R60

4.7K

R61
220

R57
15K

0.04V

R58

R59

120

R62
Not used

0.59V

R63

6.8K

1.6V

R65

R64

10K

1K

C57

R66

10n

4.7K

+5

7

8

U1B

V+

R68

R67

Not used

2.2K

V+

3140

V-

4

4

V-

U5C
NE532D

8

V+

V-

4

-5.2

Drawings & Diagrams 8-9

This page is intentionally left blank.

8-10 Drawings & Diagrams

Power Supply, PCB 1, sheet 4(5)

STAND BY

DISABLE STANDBY

EXT. DC
ON REAR
PAN EL

To Rubidium
Power

To Rubidium
Power

U+12V

TP23

+12V

J32

1
2

3
4
5
6
7
8
9

10

TO BATT

11

UNIT

12
13
14
15
16
17
18

19
20

Con20

LO BATT

+12VREG/BATT

U+12V

+12V

+5V

+5V

Q7
BC807-25

R121

10K

ON

R122

100K

J5

J6

J3

J9

J10

J4

F1

1.6AT

D9

C65

100n

2KBP08

R123
100K

Q12
BC847B

R148
16

R124

J22

100K

1

3

2

R125
100K

-+

C64
270uF

R126
1K

D12
BAV99

L6

10mH

2.2nF

C35

470n

SB140

SB140

SB140

C62

U40B

8

S

9

13

1D

11

12

C1

10

R

HEF4013BT

J16

1

U+12V

R127

1M

D7

D8

D10

U39

+

9

-

+

99

C63

2.2nF

1

4
5

POWER MODULE

+DCIN

-DCIN

-DCIN

-

+
+

-

-

PF

3

2

6
7

8
9

10
11

13
14

12

C70
10n

PF

SAFETY EARTH

R146
15K

U+12V

1

16

R1472.2K

C71
10n

K5C

Q14BC847B

D13
BAV99

D6

1N4003/200

C79

33uF-63V

TP17

L9

33uH

TP16

L7

10uH

TP15

L8

10uH

C72

C73

10n

10n

-7V

+15V

+5V

C74
68uF-6.3V

U+12V

C75
33uF-63V

U41

+

12V

U__

2

-

LM2940CT-12

13

C76
33uF-63V

3 2

J15

R155

330

OPTIONAL

FAN

U42

_

+

1.25V

_

U

-

LM317T

1

BZX79-B5V6

R154

220

D20

R153

DISCONNECT IF
BATTERY OPTION
INSTALLED

J21

1

3

2

C84
220uF-50V

R152

220

J31

Q5

BCP51

R156

R157

2.2K

6.81K

K5A

4

R149

R150

R151

220

220

220

220

R53

2.2K

8

6

SIGNAL GROUND

J7

TP21

+12V

R56
390

R55

560

R54
560

Q6
BC847B

C83
15uF-6.3V

-5.2V

+5V

6
5
3
4

U40A

S
1D
C1
R

HEF4013BT

R131

R130
220

+12V

R198

4.7K

U+12V

1
2

VCC14GND

7

U40C
HEF4013BT

+12V

R206

5.6K

8

U21C

V+

NE532D

V-

4

U21B

6

-

7

5

+

NE532D

C104

R207

10n

1K

U21A

2

-

3

+

NE532D

R197

1

120

C10310n

R196
120

Q17
BC817-25

C105

6.8u-16V

TP22

+7V

+7V

C106
10n

R132

220

R133

220

220

R134
220

R135
220

R136
220

U43

REG

In2Out

LM337T

R137
220

Adj

1.25V

R139

R140

R138220

220

R128

1.5K

R129
470

1

3

220

C82
15uF-6.3V

R141
220

13

R143

R144

-5.2V

R145
330

220

-5.2V

+7V

R142

220

220

TP20

K5B

11

9

Drawings & Diagrams 8-11

This page is intentionally left blank.

8-12 Drawings & Diagrams

Interpolators, PCB 1, sheet 5(5)

SXB

PXB

CSIA

SXA

PXA

CSIB

+12V

+5V

8

L18

BLM21A102S

U30A

1

3

&

R269
220

R278
220

2

HC00

C145
390pF

U30B

4

6

&

5

HC00

U34A

1

3

&

2

HC00

C150
390pF

U34B

4

6

&

5

HC00

+12J

C174
100nF

1

6

C157
15uF-6.3V

U34E
HC00

VCC14GND

7

U31B

VCC

ADC1061

+VCC

GND

10

U32B

C81

VCC20GND

10n

10

C158
100nF

+5ADC

C108
10n

R272

2.2K

R281

2.2K

VCC20GND

C159
100nF

10

U36B
HC573HC573

+12J

R270

R271

8.2K

820

R275

2.2K

R284

2.2K

C168
100nF

R273

47

R282

47

+5J

BFT92
Q28

C148

+12J

R279

8.2K

U35B
ADC1061

C112
10n

D23

BAV99

D25

BAV99

470pF

R280
820

BFT92
Q30

C153
470pF

C160
100nF

U44E
HC125

VCC14GND

7

D22
BAV99

+5J

D24
BAV99

+5J

1

6

VCC

+VCC

GND

10

C161
100nF

BFS17

BFS17

C118
10n

Q29

Q31

L19

BLM21A102S

R274
100

R283
100

R277
33K

R286

33K

C166
15uF-6.3V

C149

22p

C154

22p

R276

33K

R285

33K

C167
100nF

C147
Not Used

8

11

C152
Not Used

8

11

VREF-

VREF-

U30C

&

HC00

U30D

&

HC00

U34C

&

HC00

U34D

&

HC00

VREF+

9

10

12

13

VREF+

9

10

12

13

+5V

D21
BAV99

C146
10p

+5V

D26
BAV99

C151
10p

L20

BLM21A102S

U38C

V+

NE532D

V-

4

C156
15uF-6.3V

C78

U30E

VCC14GND

10n

HC00

7

U31A

20

DB0

19

DB1

8

9
7

4
3
5

8

9
7

4
3
5

VIN

VREF+
VREF-

RD
S/H
CS

VIN

VREF+
VREF-

RD
S/H

CS

ADC1061

U35A

ADC1061

18

DB2

17

DB3

16

DB4

15

DB5

14

DB6

13

DB7

12

DB8

11

DB9

2

INT

20

DB0

19

DB1

18

DB2

17

DB3

16

DB4

15

DB5

14

DB6

13

DB7

12

DB8

11

DB9

2

INT

C165
10n

C173
10n

+5V

+5V

+5J

R287
0

R288
33

R289
220

R291
47

R292
0

R293
330

R295
270

U32A

2

D0

3

D1

4
5

D3

6

D4

7

D5

8

D6

9

1

OE

11

C1

HC573

12 11

9 8

2 3

1

5 6

4

U36A

2

D0

3

D1

4
5

D3

6

D4

7

D5

8

D6

9

1

OE

11

C1

HC573

2

-

3

+

6

-

5

+

Q0
Q1
Q217D2
Q3
Q4
Q5
Q6
Q712D7

U44D

HC125

13

U44C

HC125

10

U44A

HC125

U44B

HC125

Q0
Q1
Q217D2
Q3
Q4
Q5
Q6

Q712D7

U38A

NE532D

U38B

NE532D

19
18

16
15
14
13

19
18

16
15
14
13

C155
10n

R290

1

100

C169
10n

R294

7

AR2
AR3
AR4

AR5
AR6

AR7
AD8
AD9

AD[0-15]

AR0

AR1

AR0

AR1

AR2

AR3

AR4

AR5

AR6

AR7
AD8
AD9

AD[0-15]

VREF+

C164

C163

C162

100nF

27

C170 C171

100nF 100nF

100nF

VREF-

2.2uF-6.3V

C172

2.2uF-6.3V

AR[0-7]

AD[0-15]

Drawings & Diagrams 8-13

Display & Keyboard PCB, Component layout

8-14 Drawings & Diagrams

MAIN BOARD

STAND-

BY IND

GATE

IND

SCL

SDA

U+12V

STAND-

BY

LOCAL/

PRESET

BACK­LIGHT

TEMP
COMP

+5V

GND

H0

H1

H2

ON

NC

3

P204

5

P204

7

P204

28

P204

32

P204

36

P204

35

P204

22

P204

24

P204

26

P204

38

P204

18

P204

20

P204

37

P204

21039

P204

1 4 6 12 14 16 30

P204

89111315173034

P204

V0

19 P204

EXT REF

LOCAL/PRESET

S201

ON

S222

STAND-BY

S223

S224

MAIN BOARD

V1 V2 V3 V4 V5 V6 V7

21 P204

CHECK

S202

MEAS RESTART

23 P204 25 P204

S209

FILTER

S203

DISP HOLD

S210

<FUNCTION

S216

NULL/OFFSET

FUNCTION>

27 P204 29 P204

IMP

S204

S211

S217

TRIG LVL

S205

BLANK DIGITS

S212

MEAS TIME

S218

D201

HLMP-K150

D202

CQV13-6

AUTO

S206

DATA ENTRYUP

S213

MENU

S219

RED

YELLOW

31 P204

<SENS

S207

DATAENTRY DN

AUX MENU

S220

S214

+5V

R204
10

R20510R206

R207

10

10

BACKLIGHT

D203

DL100

+5V

IC TYPE

U201 PCF8576

PCF8576

U202

11,7,8,9 5,10

GND

+5V

511,7,8,9,10

33 P204

SENS>

S208

ENTER

S215

SINGLE

S221

+5V +5V

C202

10n

C201

10n

+5V

+5V

R201

220k

Display & Keyboard, PCB 2

U201

DISPDR

12

VLCD

4

CLK

3

SYNC

6

OSC

2

SCL

1

SDA

10

SA0

7

A0

8

A1

9

A2

PCF8576

DISPDR

12

VLCD

4

CLK

3

SYNC

6

OSC

2

SCL

1

SDA

10

SA0

7

A0

8

A1

9

A2

PCF8576

U202

13

BP0

15

BP1

14

BP2

16

BP3

17

S0

18

S1

19

S2

20

S3

21

S4

22

S5

23

S6

24

S7

25

S8

26

S9

27

S10

28

S11

29

S12

30

S13

31

S14

32

S15

33

S16

34

S17

35

S18

36

S19

37

S20

38

S21

39

S22

40

S23

41

S24

42

S25

43

S26

44

S27

45

S28

46

S29

47

S30

48

S31

49

S32

50

S33

51

S34

52

S35

53

S36

54

S37

55

S38

56

S39

82 78 74 70 66 60 58 55 52 49 46 4443

454748505153545657596162636465676869717273757677798081

E201

71013141822 27 323639403837353433313029282625242321201917161512119865432141 42

13

BP0

15

BP1

14

BP2

16

BP3

17

S0

18

S1

19

S2

20

S3

21

S4

22

S5

23

S6

24

S7

25

S8

26

S9

27

S10

28

S11

29

S12

30

S13

31

S14

32

S15

33

S16

34

S17

35

S18

36

S19

37

S20

38

S21

39

S22

40

S23

41

S24

42

S25

43

S26

44

S27

45

S28

46

S29

47

S30

48

S31

49

S32

50

S33

51

S34

52

S35

53

S36

54

S37

55

S38

56

S39

Drawings & Diagrams 8-15

GPIB Unit, PM9626B, Component layout

8-16 Drawings & Diagrams

GPIB Unit, PM9626B

Drawings & Diagrams 8-17

This page is intentionally left blank.

8-18 Drawings & Diagrams

Chapter 9

Appendix

How to Replace Surface
Mounted Devices

Most of the components in this instrument are mounted on the sur
face of the board instead of through holes in the board. These compo
nents are not hard to replace but they require another technique. If
you do not have special SMD desoldering equipment, follow the in
structions below:

Fig. 9-1 Heat the leads and push a thin aluminum sheet

between the leads and the PC-board.

-

-

-

Fig 9-4 Attach the IC to the pad with the solder.

Fig. 9-5 Solder all leads with plenty of solder; don’t worry

about short-circuits at this stage.

Fig. 9-2 When removed, clean the pads with desoldering

braid.

Fig. 9-3 Place solder on the pad.

9-2 How to Replace Surface Mounted Devices

Fig. 9-6 Remove excessive solder with desoldering braid.

Fig. 9-7 Use a strong magnifying glass to make sure there

are no short-circuits or unsoldered leads.

Electrostatic discharge

Almost all modern components have extremely thin conductors and
metal oxide layers. If these layers are exposed to electrostatic dis
charge they will break down or perhaps even worse, be damaged in a
way that inevitably will cause a breakdown later on. The lectro-tatic
Discharge, (ESD) sensitivity of MOS and CMOS semiconductors
have been known quite a while, but nowadays bipolar semiconduc
tors and even precision resistors are ESD sensitive. Consider

therefoe all components, pc boards and sub assemblies as sensi
tive toelectrostatic discharge. The text below explains how you can

minimize the risk of damage or destroying these devices by being
aware of the problems, and learning how to handle these compo
nents.

ESD sensitive options are packed in conductive containers

marked with the symbol to the leftl.

Never open the container unless you are at an ESD protected

work station.

Use a wrist strap grounded via a high resistance.
Use a grounded work mat on your work-bench.

Never let your clothes come in contact with ESD sensitive

equipment even when you are wearing a grounded
wrist strap.

Never touch the component leads.

-

-

-

Never touch open connectors.
Use ESD-safe packing materials.

Use the packing material only once.
Keep paper and non conductive plastics etc. away from your

work-bench. These may block the discharge path to
ground.

-

Electrostatic discharge 9-3

Glossary

A

ASIC Application Specific Integrated Circuit

C

Calibration Adjust
ments

CSA Canadian Standards Association safety stan

G

GaAs A technique to make very fast IC’s using

GPIB General Purpose Instrumentation Bus used for

I

I2C-bus An internal address- and data bus for communi

IEC 1010-1 International Electrical Commission safety

How to restore an instrument to perform in

­agreement with its specifications

dard.

Gallium Arsenide substrate.

interconnecting several measuring instruments
to a common controller.

cation between microcontroller, measuring
logic, and options.

standard.

-

-

L

LSI Large Scale Integrated circuit

O

OCXO Oven-Controlled X-tal Oscillator

P

PCA Printed Circuit Assembly
PCB Printed Circuit Board
Performance Check A procedure to check that the instrument is

functionally operational and performs to its
specification. Must not require opening of cabi

net. If the instrument passes the check it is con
sidered as calibrate.

PWM Pulse Width Modulation

T

TCXO Temperature-Controlled X-tal Oscillator

-

-

9-4 Glossary

Power Supply Switchmode Module

Circuit Descriptions

Primary Circuits

n

For primary circuits outside the power supply module, see Chapter 4,
Circuit Descriptions, Power Supply.

The power supply module generates three DC voltages to the sec
ondary circuits.

R24-R27, R31, and R32 give the start-up voltage to the control cir
cuit U03.U03 outputs a frequency of 120 kHz on OUT (pin 10) to the
switch transistor V01. When the switch transistor has started, U03
will besupplied fromthe transformerT01 pin 3 via the diodes D09.

Every switch pulse causes a voltage drop over the resistors R35-R37
and R55. This voltage feeds the SENSE input (pin 5) of the control
circuit U03. When the voltage has reached the internal reference
level in U03, the switch transistor V01 is turned off.

P01 pin 1

P01
pin 4 & 5

-

-

T01

V05 is a blanking transistor that will compensate for high transients
generated by the transformer T01.

The internal sawtooth generator RC (pin 7) in U03 is connected to
the SENSE input via V03, to compensate for low load.

The regulated +5 V is sensed by U01 and adjusted by R50. The out
put of U03 is connected to the VF input (pin 3) of U03 via the
optocoupler U02.

The VREF pin (pin 14) outputs a reference voltage of 5 V DC.

Secondary circuits

n

For secondary circuits see Chapter 4, Circuit Descriptions, Power
Supply.

P02 pin 2

D01

P02 pin 7

D04

-

R24-R27,

R31-R32

SENSE

RC

VF

V05

Fig. 9-8 Power supply module primary circuits.

D09

OUT

U0 3

V03

V01

VR EF

U02

T0 1

D02

P02pin5&6

U01

R50

P02
pin1,4,8,& 9

P02 pin 3

D03

Circuit Descriptions 9-5

Repair

Troubleshooting

n

Primary circuits

CAUTION: If you adjust the +5 V trimmer you have to

adjust the complete instrument.

Required Test Equipment

n

To be able to test the instrument properly using this manual you will
need the equipment listed in Table 9-1. The list contains specifica
tions for the critical parameters.

Type Performance

DMM 3.5 digits

Oscilloscope 50 MHz 2-channel

Table 9-1 Required test equipment.

Operating Conditions

n

Power voltage must be in the range of 90 to 260 VAC.

WARNING: Live parts and accessible terminals which

can be dangerous to life are always exposed inside
the unit when it is connected to the line power. Use
extreme caution when handling, testing or adjusting
the counter.

1

P0 1

»+5.0V

U03

+10 to 13.5V

C

E

D

»+10mV

A

V0 1

B

J16

16

U02

T01

127

»+8.2V

+5Vadjust

»+4.4V

U01

P0 2

1

TP17

TP15

TP16

To verify the power supply proceed as follows:

If the primary fuse is broken, there is a short circuit in the pri

–

-

mary circuits. Use a DMM and try to locate the fault by resis
tance measurements.

Remove the cover from the power supply.

–

Disconnect the power module from the main PCA and check

–

the resistance between pin 1 and 4 on the transformer T01, see
Fig. 9-9. If the DMM shows a short circuit, the fault is
proabably a broken transistor V01. Put the power module back.

Connect the counter to the line power via an insulating trans

–

former with separate windings.

Set the counter to STAND-BY mode.

–

Check that the voltage between J9 and J10 is in the range of

–

90 to 260 V

Check that the DC voltage between pin 1 and 4 on T01 is

–

about Ö2 times the input AC voltage. If not, use traditional
faultfinding techniques to locate the fault.

Disconnect the secondary load by moving the jumper J16 to its

–

alternative position.

Check the “STAND BY” voltages according to Table 9-2.

–

Test points Ground Voltage

U03 pin 11 & 12 U03 pin 8 +10 to +13.5 V

U03 pin 14 U03 pin 8 +5.0 V

V01 source U03 pin 8 +10 mV

U02 pin 1 Amplifier Screen +8.2 V
U01 pin 1 Amplifier Screen +4.4 V

TP15 Amplifier Screen +5.1 V
TP16 Amplifier Screen +14.8 V to +21 V
TP17 Amplifier Screen –12.5 V to –7.5 V
TP21 Amplifier Screen +12 V ±0.5 V

Table 9-2 Stand-by voltages.

Restore the jumper J16 to its normal position.

–

Check the waveforms in Fig. 9-10 at the corresponding

–

testpoints in Fig. 9-9 to verify the primary circuits. Use the
heat-sink of V01 as ground.

NOTE: U01 and U03 are located at the bottom side of the

PCA.

Secondary circuits

n

For secondary circuits see Chapter 5, Repair, Power Supply.

AC

.

-

-

-

Safety Inspection and Test After Repair

Fig. 9-9 Test points and voltages for the power supply.

9-6 Repair

General Directives

n

After repair in the primary circuits, make sure that you have not re
duced the creepage distances and clearances.

Before soldering, component pins must be bent on the solder side of
the board. Replace insulating guards and plates.

-

V

V01 Sourc e ( curre nt )

1.2

1.1

1.0

0.8

0.6

0.4

0.2

024 8610uS

V

12

10

8

6

4

2

V

3

2

1

U03 pin 10 OUT

U0 3 p in 7 R C

A

C

E

V0 1 G a te

024 8610uS

V01 dra in

024 8610uS024 8610uS

500

400

300

200

100

V

12
10

8

6

4

2

V

Switch on the counter.

B

–

Press PRESET, then press ENTER.

–

Power

D

Modu le

TP23

+5V adjust

024 8610uS

Fig. 9-10 Typical curves of the power supply.

Safety Components

Components in the primary circuits are important to the safety of the
instrument and may be replaced only by components obtained from
your local Fluke organization.

Check the Protective Ground Connection

Visually check the correct connection and condition and measure the
resistance between the protective lead at the plug and the cabinet.
The resistance must not be more than 0.5 W. During measurement,
the power cord should be moved. Any variations in resistance shows
a defect.

Calibration Adjustments

Required Test Equipment

Type Performance

DMM 3.5 digits

Table 9-3 Required Test Equipment.

TP17

TP16

J1 8

Fig. 9-11 Test points and trimmer for the power supply.

Adjustment

n

CAUTION: If you adjust the +5 V trimmer you have to

adjust the complete instrument.

Connect the DMM between TP23 and ground, see Fig. 9-11.

–

Adjust the +5 V trimmer potentiometer R50 in the power sup

–

ply through the nearest vent in the protective cover, until the
DMM reads +5.00 ± 0.01 V.

Check that the unregulated voltage from the power supply at

–

test point TP16=+15 is about +18 V.

Check that the unregulated voltage from the power supply at

–

test points TP17=–7 is about –8 V.

-

Preparation

WARNING: Live parts and accessible terminals which

can be dangerous to life are always exposed inside
the unit when it is connected to the line power. Use
extreme caution when handling, testing, or adjust
ing the counter.

Before beginning the calibration adjustments, power up the instru
ment andleave iton forat least60 minutesto letit reachnormal oper
ating temperature.

Setup

n

Connect the counter to the line power.

–

-

-

-

Calibration Adjustments 9-7

Replacement Parts

Pos Description Part Number P

Heat Sink 16°K/W TO220 5322 255 41313 P

Heat Sink 13.5°K/W TO220 5322 255 41314 P
C01 Capacitor 1 nF 5% 63V 4822 122 31746
C02 Capacitor 1 nF 5% 63V 4822 122 31746

C03 Capacitor 220 pF 20% 200V 5322 126 13129
C04 Capacitor 33 nF 10% 50V 4822 122 31981
C05 Capacitor 33 nF 10% 50V 4822 122 31981
C06 Capacitor 33 nF 10% 50V 4822 122 31981
C07 Capacitor 100 nF 10% 63V 4822 122 33496

C08 Capacitor 100 nF 10% 63V 4822 122 33496
C09 Capacitor 47 nF 10% 250V 4822 121 41676
C10 Capacitor 330 nF 20% 250V 5322 121 44222
C12 Capacitor 100 mF 20% 35V 5322 124 40852
C13 Capacitor 220 pF 20% 200V 5322 126 13129
C14 Capacitor 100 pF 5% 63V 4822 122 31765

C15 Capacitor 22 pF 5% 63V 4822 122 32482
C16 Capacitor 4.7nF 10% 63V 4822 122 31784
C17 Capacitor 4.7nF 10% 63V 4822 122 31784
C18 Capacitor 100 nF 10% 63V 4822 122 33496
C19 Capacitor 100 nF 10% 63V 4822 122 33496

C20 Capacitor 100 nF 10% 63V 4822 122 33496
C21 Capacitor 470 mF 20% 35V 2M 5322 126 13131
C22 Capacitor 470 mF 20% 35V 2M 5322 126 13131
C23 Capacitor 10000 mF 20% 6.3V 5322 124 80821
C24 Capacitor 1 nF 5% 63V 4822 122 31746

C25 Capacitor 100 nF 10% 63V 4822 122 33496
C26 Capacitor 100 nF 10% 63V 4822 122 33496
C27 Capacitor 100 nF 10% 63V 4822 122 33496
C28 Capacitor 220 pF 20% 200V 5322 126 13129
D01 Diode 7A BYW29/200 5322 130 32328

D02 Diode 7.5A MBR760 60V 5322 130 83602
D03 Diode 7A BYW29/200 5322 130 32328
D04 Diode 0.2A BAV23 200V 5322 130 33764
D06 Diode 0.35 W BZX84-C8V2 5322 130 80255
D07 Diode BYV26E DOD57 4822 130 60815
D08 Diode 0.35 W BZX84-C18 5322 130 80212

D09 Diode 0.2A BAV23 200V 5322 130 33764
D11 Diode 0.35 W BZX84-C18 5322 130 80212
D12 Diode 0.35 W BZX84-C18 5322 130 80212
D13 Diode 0.35 W BZX84-C8V2 5322 130 80255
D14 Diode 0.2A BAV23 200V 5322 130 33764

R01 Resistor 82 kW 1% .125W 4822 051 10829
R02 Resistor 82 kW 1% .125W 4822 051 10829
R03 Resistor 270 kW 1% .125W 4822 051 10271
R04 Resistor 10.0 kW 1% 0.125W 4822 051 51003
R06 Resistor 2.20 kW 1% .125W 5322 116 80434

R07 Resistor 1.00 kW 1% 0.125W 4822 051 51002
R08 Resistor 1.80 kW 1% .125W 4822 051 10182
R09 Resistor 3.90 kW 1% .125W 5322 116 80443
R10 Resistor 47 kW 1% .125W 5322 116 80446
R11 Resistor 220 kW 1% .125W 5322 116 80436

R12 Resistor 10.0 kW 1% 0.125W 4822 051 51003
R13 Resistor 10.0 kW 1% 0.125W 4822 051 51003
R14 Resistor 10.0 W 1% 0.125W 4822 051 51003
R15 Resistor 10.0 kW 1% 0.125W 4822 051 51003
R16 Resistor 10.0 kW 1% 0.125W 4822 051 51003

Pos Description Part Number P

R17 Resistor 10.0 kW 1% 0.125W 4822 051 51003
R18 Resistor 10.0 kW 1% 0.125W 4822 051 51003
R19 Resistor 10.0 kW 1% 0.125W 4822 051 51003
R20 Resistor 10.0 kW 1% 0.125W 4822 051 51003

R24 Resistor 100 kW 1% 0.125W 4822 051 51004
R25 Resistor 100 kW 1% 0.125W 4822 051 51004
R26 Resistor 100 kW 1% 0.125W 4822 051 51004
R27 Resistor 100 kW 1% 0.125W 4822 051 51004
R28 Resistor 10.0 kW 1% 0.125W 4822 051 51003

R29 Resistor 4.7 W 10% 0.25W 4833 051 10478
R30 Resistor 10.0 kW 1% 0.125W 4822 051 51003
R31 Resistor 100 kW 1% 0.125W 4822 051 51004
R32 Resistor 100 kW 1% 0.125W 4822 051 51004
R33 Resistor 10.0 W 1% 0.125W 4822 051 10109

R34 Resistor 1.00 kW 1% 0.125W 4822 051 51002
R35 Resistor 2.7 W 5% 0.25W 4822 051 10278
R36 Resistor 2.7 W 5% 0.25W 4822 051 10278
R37 Resistor 2.7 W 5% 0.25W 4822 051 10278
R38 Resistor 1.00 kW 1% 0.125W 4822 051 51002

R39 Resistor 10.0 W 1% 0.125W 4822 051 10109
R40 Resistor 100 W 1% 0.125W 5322 116 80426
R41 Resistor 100 W 1% 0.125W 5322 116 80426
R42 Resistor 1.00 kW 1% 0.125W 4822 051 51002
R43 Resistor 100 W 1% 0.125W 5322 116 80426

R44 Resistor 100 W 1% 0.125W 5322 116 80426
R45 Resistor 1.00 kW 1% 0.125W 4822 051 51002
R46 Varistor 95V 95VRMS4.1J 5322 116 21222 P
R47 Resistor 4.70 kW 1% .125W 5322 116 80445
R48 Resistor 10.0 kW 1% 0.125W 4822 051 51003

R49 Resistor 22.0 kW 1% .125W 5322 116 80435
R50 Potentiometer 1 kW 20% 4822 101 10792
R51 Resistor 3.30 kW 1% .125W 4822 051 53302
R52 Resistor 8.20 kW 1% .125W 4822 051 10822

R53 Resistor 470 kW 1% .125W 5322 116 80447
R54 Resistor 470 kW 1% .125W 5322 116 80447
R55 Resistor 2.7 W 5% 0.25W 4822 051 10278
R56 Resistor 100 W 1% 0.125W 5322 116 80426
R57

Resistor 47 W 1% .125W

R58 Resistor 270 W 1% .125W 4822 051 10271
T01 Transformer 5322 148 20035 P
U01 IC-ref 2.5V TL431I-D SO8 5322 209 62422
U02 Optocoupler CNX82A 4822 130 10025
V02 Transistor 0.50 A BC807-25 5322 130 60845

V03 Transistor 0.50 A BC817-25 4822 130 42804
V04 Transistor 0.50 A BC817-25 4822 130 42804
V05 Transistor 0.50 A BC817-25 4822 130 42804
V06 Transistor 0.50 A BC817-25 4822 130 42804
V07 Transistor 0.50 A BC817-25 4822 130 42804

V08 Transistor 0.50 A BC807-25 5322 130 60845

5322 116 80448

9-8 Replacement Parts

This page is intentionally left blank.

Replacement Parts 9-9

Power Supply, Component layout

TOP SIDE

BOTTOM SIDE

9-10 Replacement Parts

Power Supply

2

3

4

5

C1 9

R5 8

C28

D03

BYW2 9F -20 0

27 0

R0 3

220P

C03

163

10 0N

C22

470U-35V

D02

R0 2

27 0

C02

220P

12109

11

4

C13

C0 9

4 7N- 250 V

R4 6

R1 7

10K

R1 8

10K

R16

10K

R19

10K

R15

10K

R20

10K

R53

470 K

R54

R2 4

100K

R2 5

C2 0

10 0N

C21

470U-35V

D01

BYW2 9F -20 0

82

R0 1

C01

1N

8

7

T0 1

P02

6

MBR760

82

1N

R33

22 0P

R1 2

R13

R14

470 K

100K

8

9

7

C1 8

10 0N

R05

C23

C06

33 N

10 000 U-6 . 3V

R04

10K

C0 5

33N

D04

BAV2 3

C0 4

33N

D04

BAV2 3

D09

BAV2 3

D09

10

BAV2 3

D07

BYV2 6E

10K

V01

10K

BUK446

10K

R3 2

100K

10K

6

A

U0 1

K

REF

1

R09

3.9K

R06

2. 2K

D0 6

C0 7

V08

BC807

R57

100

R29

4.7

C26

R55

10

R3 5

2.7

R3 6

2. 7

R37

2.7

R28

10 K

D08

BZX84C18

C25

V0 6

D11

BZX8 4C18

C12

R3 0

10K

8

C0 8

BZX84C 8V2

10 0N

C2 4

R49

100 N

100N

BC8 17

100 U-3 5V

R1 0

R0 8

1. 8K

R07

1K

1

2

U02

CNX82A

5

4

1N

1K

R3 4

22 K

1473

11, 12

VRE F

U03

OUT

10

R5 6

100

R38

R3 9

V07

BC81 7

R51

TL43 1I

10 0N

47K

VF

RC

5

R44

1K

10

3. 3K

13

2

1K

R5 0

R1 1

220 K

R52

8. 2K

R4 8

10 K

1

8, 9

CO MP

SENSE

100

V03

BC81 7

UC38 42 A

R47

4. 7K

R43

100

C1 4

1 00P

V02

BC80 7

R4 1

C27

10 0N

1K

R4 5

C17

4. 7N

C1 6

4.7N

V05

BC8 17

R42

1K

D1 4

BAV23

C15

22 P

10 0

D14

R31

R26

100K

R27

4 1

5

1

C10

33 0N

P01

100K

100K

D12

D13

BZX84 C18

BZX84C8 V2

V04

BAV2 3

BC81 7

R40

100

Replacement Parts 9-11

PM6685R

Introduction

A Rubidium timebase is now available for the PM6685 Frequency
counter. This oscillator cannot be retrofitted in the standard version
of the PM6685. Due to the size of the timebase and its power require
ments, a larger cabinet must be used.

A fan is needed to keep the temperature to an acceptable level.

This version is called PM6685R, where “R” stands for Rubidium.

J3

J4

Supply

Main

Powe r

J31

J24

1

Aux Power

P3

Rubidium
Timebase

1

P1

Supply

P2

1

Fan

Performance Check

Required Test Equipment

-

Type Performance Model

10 MHz reference £1x10

Table 9-4 Required test equipment

NOTE: To fully test the accuracy of the PM6685R, access to

an extremely high stability reference signal is needed,
for example a Cesium atomic reference or a transmit
ted signal from a nationally or internationally traceable
source. Additionally the instrument has to be stabilized
for a period of one month.

The PM6685R is equipped with an LED labelled “UNLOCKED”.
When the LED is lit the Rubidium time base is still in its warm-up
phase and is not yet stabilized.

-10

Calibrated Rubidium
oscillator or Cesium
atomic standard

Test procedure

Connect the counter to the line power.

–

Check that the UNLOCK LED is lit.

–

Check that the UNLOCK LED is switched off within £ 6

–

minutes after connection to line power.

Connect a 10 MHz reference signal to input A of the counter.

–

Select FREQUENCY A measurement.

–

Select 1 s measuring time.

–

Check that the displayed frequency is 10.00000000 MHz

–

±1 LSD < 6 minutes after connection to line power.

-

Freq. Adj .

Fig. 9-12 Location of the Rubidium Timebase and its power

supply.

9-12 Introduction

Functional Description

The oscillator is supplied with 24 V from the extra power supply.

The oscillator generates a stable 10 MHz output frequency from a
20 MHz Voltage Controlled Crystal Oscillator (VCXO), whose fre

-

quency is locked to the atomic-standard “resonance frequency” of

9
2

the rubidium atom, see Fig. 9-14.

Frequency multiplier/

Sy nt hesi zer

20 MH z Volt age t una ble

Quartz Oscillator

(VCXO)

6.8 GHz

DC correction

voltage

Rub idium

lamp

Detector

R ubi dium

cell

DC-error

si gn a l

Feedback

electronics

(Servo)

por to an increased extent causing a decrease in the photo detector
current. This “darkening” effect is used to generate an error signal
which permits continuous regulation of the quartz crystal oscillator
output frequency, thereby locking it to the frequency of the atomic
standard .

Calibration Adjustments

NOTE: Before Calibration Adjustment, the Rubidium time

base must have been in operation for more than 24
hours.

Required Test Equipment

10 MHz output

Fig. 9-14 Block diagram showing the principle of a Rubidium

Atomic Standard.

Type Performance Model

10 MHz reference £1x10

-10

Calibrated Rubidium
oscillator or Cesium

atomic standard

Table 9-5 Required test equipment.

A microwave signal that is derived from the VCXO tunable oscillator

is applied to rubidium vapor contained within a heated glass cell.

Light from a rubidium lamp is passed through the cell and

illluminates a photo detector causing current to flow in the detector.

As the applied microwave signal approaches the frequency that cor

responds tothe ultrastable rubidiumatomic resonancefrequency,the

rubidium light entering the glass cell is absorbed by the rubidium va

-

-

Setup

Connect the counter to the line power.

–

Press PRESET, then ENTER.

–

Press AUX.

–

UNIT 1J9

0to
60v

LINE
FILTER

CNT-85R REAR

PM6685R REAR

PA NEL

PANEL

SUPPLY

P1

L

31N

J3

J10

J4

REAR VIEW

OF P3

2

1

SAFETYEARTH

A1AUXPOWER

P2

0V

2

3

0V

4

+24V

5

+24V

10

J24

5

10 MHz

3

L1- L3

9

P3

1
2

3
4

5

6
7

8
9

10

RUBIDIUM

OSCILLA TO R

TYPE LPRO

A2

D1 UNLOCKED

FREQ.

1

ADJ US T

R1

2

1k

2

3

R2

3.83k

1

3

Fig. 9-13 Wiring diagram showing the interconnections between the Rubidium timebase, its power supply, and the main PCA.

Calibration Adjustments 9-13

Select NULL by pressing s or t.

–

Press ENTER twice.

–

Set the measuring time to 10 s.

–

Connect the 10 MHz reference to the input A of the counter.

–

Adjustment procedure

Remove the seal from the front panel.

–

Adjust the potentiometer beyond the seal until the display

–

reads 0.5

Check that the value is stable over time, (more than 30 min

–

utes).

Cover the “CALIBRATION ADJUSTMENT” hole on the front

–

panel with a relevant seal if necessary.

-3

Hz or less.

-

Replacement Parts

Pos Description Part Number P

Cover, (incl. front part). 5322 447 92194 P
Fan 2822 031 01327 R
Text plate kit 4031 100 62440 R

Rear plate 4031 100 53930 P
A1 Power supply 5322 214 91268 P
D1 LED, HLMP-1300, red 5322 130 81921

L1 Toroid 5322 526 10545
L2 Toroid 5322 526 10545
L3 Toroid 5322 526 10545
P1-P3 Cable kit 4031 100 61530 P
R1 Potentiometer, 1 kW 5322 101 11298
R2 Resistor 3.83 kW, 1% 0.5 W MRS25 4822 050 23832

NOTE: The rubidium time base (unit A2) must be sent to a

Fluke service center for repair. Follow the exchange
procedure.

9-14 Replacement Parts