Tektronix ps280, ps283 schematic

TEK

Part No. 070-8356-00
Product Group 3M

&

PS283

WARNING

The following servicing instructions
are for use by qualified service
personnel only. To avoid personal
injury, do not perform any servicing
unless you are qualified to do so.
Refer to the Safety Summary prior

to performing any service.

Please check for CHANGE INFORMATION
at the rear of this manual.

I

LABORATORY DC

POWER SUPPLY

Service Reference

First Printing JUL 1991
Revised AUG 1991

Tektronix

COMMTTCD

TO

EXEa_LB\CE

Copyright©
publication may not be reproduced in any form without the written
permission of Tektronix, Inc.

1991

Tektronix, Inc. All rights

reserved.

Contents of this

Products of
and foreign patents issued and pending.

TEKTRONIX, TEK, SCOPE-MOBILE, and W2S are registered
trademarks of Tektronix, Inc.

Printed in

reserved.

Tektronix,

U.S.A.

Inc., and its subsidiaries are covered by U.S.

Specification and price change privileges are

INSTRUMENT SERIAL NUMBERS

Each instrument
stamped on the chassis. The first two digits designate the country of
manufacture. The last five digits
each instrument. The country of manufacture is identified as follows:

B000000 Tektronix, Inc., Beaverton, Oregon,
E200000 Tektronix United Kingdom, Ltd., Marlow

has a

serial number

of

the serial number are unique

on a

panel insert,

U.S.A.

tag, or

to

G100000 Tektronix Guernsey, Ltd., Channel Islands
HKOOOOO Hong Kong
H700000 Tektronix Holland, NV, Heerenveen,

The Netherlands

JPOOOOO Sony/Tektronix, Japan

TWOOOOO Taiwan

WBWtfitiAnnnrinn contents

Specifications

Operating Information

Operators and Service Safety Summary

Symbols and Terms
Specific Precautions

Product Description

General

Specifications

General Operating Instructions

Front Panel

Rear Panel

- -|_i

2-1
The Variable Power Supplies
The Fixed Voltage Power Supply

2-4

xi

xii

1.1

1_2

2-1

2-2

X

2-3

i

Theory

of

Operation

Theory

of

Operation
General
Circuit Description

3.1

Master Voltage Output
Slave Voltage Output

5 V Fixed Voltage Output

3.1

3-1

3-1

3-2

3-4

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG 1991

Performance Verification

Adjustment

Preparation 4-1

Requirements for Performance 4-1

Warm-up Period 4-1
Access 4-1
Test Equipment 4-1

Equipment Required 4-2

Performance Tests 4-3

Constant Current Load Regulation 4-3
Constant Current Ripple and Noise 4-5
Constant Voltage Regulation 4-7

Preparation 5-1

Requirements for Performance 5-1

Personnel 5-1
Warm-up Period 5-1
Access 5-1
Test Equipment 5-1

Maintenance

Adjustment Procedures 5-3

Independent Mode 5-3
Series Tracking Mode . «. 5-5
Parallel Tracking Mode 5-6

5 V Fixed 5-7

Information 6-1

Helpful Procedures 6-1
Preventing ESD 6-1

Inspection and Cleaning 6-5

General Care 6-5
Inspection and Cleaning Procedures 6-5

Inspect Exterior 6-5
Cleaning Procedure - Exterior 6-6
Inspect Interior 6-6
Cleaning Procedure — Interior 6-7
Lubrication 6-8

REV AUG

1991

Contents

Options

Removal and Installation Procedures 6-9

Preparation - Please Read 6-9

List of Modules 6-9
General Instructions 6-10

Top Cover Removal 6-10

Slave Circuit Board Removal 6-12
Fuse Circuit Board Removal 6-13

AC Selector Circuit Board Removal 6-14

Master Circuit Board Removal 6-16
Front Panel Display Circuit Boards Assembly Removal 6-17
Front Panel Controls Circuit Board Removal 6-19
Output Connectors Circuit Board Removal 6-21
Power Transistor Circuit Boards Removal 6-23

Options and Accessories 7-1

Power Cord Options 7-1
Standard Accessories 7-1
Optional Accessories 7-1

Parts List

Diagrams

Index

Parts List 8-1

Parts Ordering Information 8-1
Module Replacement 8-1
Using the Parts List 8-2

Item Names 8-2
Indentation System 8-2

Abbreviations 8-2

Diagrams and Circuit Board Illustrations 9.1

Component Values g_1

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REVAUG 1991

WM§$XfX¥\rUlJ List of Illustrations

Figure

2-1:

PS280 or PS283 Front Panel 2-1

Figure 2-2: Variable Power Supply Controls 2-2
Figure 2-3: Fixed Power Supply Controls 2-3
Figure 2-4: PS280 or PS283 Rear Panel 2-4

Figure

3-1:

PS280 or PS283 Variable Outputs Block Diagram 3-3

Figure 3-2: PS280 or PS283 5 V Block Diagram 3-4

Figure

4-1:

Constant Current Test Setup 4-3

Figure 4-2: Constant Current Ripple and Noise Test Setup 4-5

Figure 4-3: Constant Voltage Test Setup 4-7

Figure

5-1:

Master Circuit Board Adjustment Locations 5-8

Figure 5-2: Display Assembly Circuit Board Adjustment Locations ... 5-9
Figure 5-3: Front Panel Controls Circuit Board Adjustment Locations . 5-9

Figure

6-1:

Top Cover Removal 6-11
Figure 6-2: Slave and Fuse Circuit Board Removal 6-13
Figure 6r3: AC Selector and Master Circuit Board Removal 6-15
Figure 6^4: Front Panel Display Assembly Removal 6-18
Figure 6-5: Front Panel Controls Assembly 6-20
Figure 6-6: Output Connectors Circuit Board

and Power Switch Location 6-22

Figure 6-7: Power Transistor Circuit Boards Location 6-23

PS280 & PS283

Laboratory

DC

Power Supply

Figure

8-1:

Exploded View A 8-8
Figure 8-2: Exploded View B 8-16

Module-Level Service Manual REV AUG 1991

vii

WMMfflfWinnnnj ust

Table 1-1: Operational Characteristics 1-2
Table 1-2: Physical Characteristics 1.3
Table 1-3: Environmental Characteristics 1-3

Table 1-4: Electrical Characteristics 1-3

Table

4-1:

Test Equipment 4-2
Table 4-2: Load Resistor Values for Current Checks 4-4
Table 4-3: Load Resistor Values for Ripple Checks 4-6
Table 4-4: Load Resistor Values for Voltage Checks 4-8

Table

6-1:

Relative Susceptibility to Static-Discharge Damage 6-3
Table 6-2: External Inspection Check List 6-6
Table 6-3: Internal Inspection Check List 6-7
Table 6-4: Tools Required for Module Removal 6-10

of Tables

PS280 & PS2S3 Laboratory DC Power Supply Module-Level Service Manual ;

x

Operators and Service Safety Summary

Please take a moment to review these safety precautions. They are provided

for your protection and to prevent damage to the power supply. This safety

information applies to all operators and service personnel.

Symbols and Terms

These two terms

• l^°!L\ statements identify conditions or practices that could result in
damage to the equipment or other property.

ttwwws

•

I

personal injury or loss of life.

These two terms appear on equipment:

•

CAUTION

one reads the marking, or a hazard to property including the equipment

•

DANGER

reads the marking.

This symbol appears in manuals:

appear

* statements identify conditions or practices that could result in

indicates a personal injury hazard not immediately accessible as

indicates a personal injury hazard immediately accessible as one

in

manuals:

®

Static-Sensitive Devices

These symbols appear on equipment:

DANGER

High Voltage

PS280 & F32S3 Laboratory DC Power Supply Module-Level Service Manual xl

Protective

ground (earth)

terminal

ATTENTION

manual

Specific Precautions

Observe all of the following precautions to ensure your personal safety and to
prevent damage to either the PS280 or PS283Laboratory DC Power Supply or
equipment connected to it.

Do Not Perform Service While Alone

Do not perform internal service or adjustment of this product unless another

person capable of rendering first aid and resuscitation is present.

Use Care When Servicing With Power On

Dangerous voltages exist at several points in this product. To avoid personal
injury, do not touch exposed connections or components while power is on.
Disconnect power before removing protective panels, soldering, or replacing
components.

Power Source

The PS280 or PS283 Laboratory DC Power Supply is intended to operate from

a power source that will not apply more than 250 V rms between the supply
conductors or between either supply conductor and ground. A protective
ground connection, through the grounding conductor in the power
essential for safe system operation.

cord,

is

Grounding the power supply

The PS280 or PS283 Laboratory DC Power Supply is grounded through the
power

cord.

To avoid electric shock, plug the power cord into a properly wired

receptacle where earth ground has been verified by a qualified service person.

Do this before making connections to the output terminals of the Laboratory DC
Power Supply. -

Without the protective ground connection, all parts of the PS280 or PS283

Laboratory DC Power Supply are potential shock hazards. This includes knobs
and controls that may appear to be insulators.

Use the Proper Power Cord

Use only the power cord and connector specified for your product. Use only a
power cord that is in good condition.

Use the Proper Fuse

To avoid fire hazard, use only the fuse specified in the parts list for your
uct, and which is identical in type, voltage rating, and current rating.

prod-

REV AUG 1991

Operators and Service Safety Summary

Do Not Remove Covers or Panels

To avoid personal injury, do not operate the PS280 or PS283 Laboratory DC

Power Supply without the panels or covers.

Do Not Operate in Explosive Atmospheres

ThePS280 or PS283 Laboratory DC Power Supply provides no explosion
protection from static discharges or arcing components. Do not operate in an
atmosphere of explosive gasses.

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

xll!

BmMfJWnr Specifications

#%f%M_rLTLn Product Description

This subsection begins with a general description of the PS280 or PS283

Power Supply. The Specifications subsection immediately follows.

General

The Tektronix PS280 or PS283 Laboratory DC Power Supply is a multifunction

bench or portable instrument. This regulated power supply provides a fixed 5 V
output for powering logic circuits and two variable outputs for a wide variety of
test and experimental uses. The PS280 or PS283 can be used in any applica­tion where three independent power supplies housed in a single package
represent a convenience.

The PS280 or PS283 contains two identical, independently adjustable DC
power supplies that you can vary from 0 to 30

variable power supplies varies from 0 to 2 A. The current on the PS283

able power supplies varies from 0 to 1 A. In all other respects the instruments
are identical. Unless otherwise noted, descriptions and procedures in this
manual apply to both instruments.

Front panel switches select one of three modes of operation: independent,
series, or parallel. In the independent mode, the output voltage and current of
each supply can be controlled independently. In the two tracking modes, the

variable outputs are connected either in series or in parallel. Under these
circumstances, the controls of the master power supply adjust the voltages or
current of both power supplies. Series mode allows the power supplies to be

varied from 0 to 60 V at 0 to 2 A for the PS280, or 0 to 1 A for the PS283.

Parallel mode allows the power supplies to be varied from 0 to 4 A for the
PS280 at 0 to 30

V,

or from 0 to 2 A at 0 to 30 V for the PS283.

V.

The current on the PS280

vari-

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV

AUG 1991

f-f

Product Description

Specifications

Table 1-1: Operational Characteristics

Characteristic
Outputs
Voltage (5 V)

Voltage (0-30 V)

Line regulation (5 V)
Line regulation (CV)

Line regulation (CC)
Load regulation (5 V)
Load regulation (CV)

Load regulation (CC)
Ripple/noise (5 V)
Ripple/noise (CV)
Ripple (CC)

Measurement

Two 0 to 30

5.0 ±0.25 VDC at 3.0 A maximum foldback current limited
0-30 constant VDC at 2.0 constant A maximum (PS280) or 1.0

constant A maximum (PS283)
<5mV

<0.01%
<0.01%

<0.2%
<0.2%
<0.01 % + 3 mV (rating current <3 A)

<0.01 % +5 mV (rating current >3 A) PS280
<300 mV (0-60 V single series tracking supply)

<0.2%
<2 mV rms
<1 mV
<3 mA rms

VDC,

one 5 VDC

+3mVPS280
+ 5 mV PS283

+3mA

+3mA

rms,

5 Hz-1 MHz

Temperature coefficient (CV)
Recovery time (CV)

Tracking error (slave)
Indicator
Meter indicators

Insulation (chassis to terminals)
Insulation (chassis to AC cord)

<300 ppm/ °C
<100 p.s (time to recover after a 50% load change with 0.5 A

minimum)
<0.5%

-f-10 mV of the master supply

Two 31/2 digits 0.5 in. LED panel display meter

0-30 VDC ±(0.5% of RDG + 2 digits)

0-2 A ±(0.5% of RDG + 2 digits)
>20 MH at DC 500 V
>30 MXl at DC 500 V

REVAUG 1991

Specifications

Table 1-2: Physical Characteristics

Product Description

Dimension
Width
Height

Depth

Weight

Characteristic
Storage
Operating

Characteristic
Line voltage

Power consumption

Measurement
255 mm (10.0 in)
145 mm (5.7 in)

335 mm (13.2 in)

11.5 kg (25.4 Ib) PS280 9.0 kg (19.9 Ib) PS283

Table 1-3: Environmental Characteristics

Temperature Relative Humidity

-10°Cto+70°C 70%
0°C to 40 °C 80%

Table 1-4: Electrical Characteristics

Measurement
90 to 110

108 to 132
198 to 242

216 to 250, all VAC at 50-60 Hz
348 VA, 250 W maximum (PS280)

254 VA, 172 W maximum (PS283)

PS2S0 & P5283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

IHF LTOperating Information

WWXtX General Operating Instructions

Front Panel

This section describes the controls on the front and rear panels of the PS280

or PS283 Laboratory DC Power Supply.

Figure

2-1

shows the front panel of the instrument.

LABORATORY

1.

The power switch turns on the instrument when pressed. When you press

it again, the instrument is turned off.

DC POWER SUPPLY

Figure

2-1:

PS280 or PS283 Front Panel

//// TWCmniX

PS 280

CC POWER

SUPPLY/

2.

The switches labeled TRACKING determine the test mode of the instru-

ment. The PS280 or PS283 features two tracking modes: series and
parallel.
able power supplies operate independently. If the left switch is pushed in,

the instrument operates in series mode. If both switches are pushed in, the

instrument operates in parallel mode.
In series mode, the master power supply controls the voltage for both

power supplies, which can then range from 0 to 60 V.
In parallel mode, the master power supply controls both the voltage and

the current for both power supplies. The current can then range from 0 to
4A(0to2AforthePS283).

PS2S0 & PS283 Laboratory DC Power Supply Module-Level Service Manual

If both push-button switches are disengaged (out), the two

REV AUG

vari-

1991

General Operating Instructions

3. These controls affect the right variable power supply. If the instrument is in
a tracking mode, the right power supply is the master. In a tracking mode,
either or both of the control knobs can affect both variable power supplies.

4.

These controls affect the left variable power supply. If the instrument is in a

tracking mode, the left power supply is the slave. In a tracking mode,
either or both of the control knobs have no effect.

5. These controls affect the fixed 5 V power supply.

The Variable Power Supplies

Figure 2-2 shows the controls for the master variable power supply.

CURRENT

VOLTAGE

Figure 2-2: Variable Power Supply Controls

1.

The output terminals for the power supply allow you to plug in the test

leads.

The red one on the right is the positive polarity output terminal. It is

indicated by a + sign above it.

The black one on the left is the negative polarity output terminal. It is
indicated by a - sign above it.

The green one in the middle is the earth and chassis ground.

2.

The voltage control knob allows you to set the output voltage for the

power supply.

REV AUG

1991

3. The current control knob allows you to set the output current for the power
supply.

4.

If the C.V. light is lighted, the power supply is producing a constant volt-

age.

If the C.C. light is lighted, the power supply is producing a constant

current.

Operating Information

General Operating Instructions

5. The LED display lights when the instrument is turned on. The numbers
indicate the voltage or current produced by the variable power supply.

6. The AMPS/VOLTS meter selection switch determines whether the LED

display shows the current or the voltage. If the switch is pushed to the left,
the display shows the current. If the switch is pushed to the right, the
display shows the voltage.

The meter selection switch is to the right of the corresponding display for the
slave variable power supply. All other controls are the same for both variable
power supplies.

The Fixed Voltage Power Supply

Figure 2-3 shows the controls for the fixed voltage power supply.

5V FIXED 3A

Figure 2-3: Fixed Power Supply Controls

1.

The output terminals for the power supply allow you to plug in the test

leads.

The red one on the right is the positive polarity output terminal. The

black one on the left is the negative polarity output terminal.

2.

The overload indicator lights when the current on the 5 V power supply

becomes too large.

PS280 & PS2S3 Laboratory DC Power Supply Module-Level Service Manual

REV

AUG 1991

2-3

General Operating Instructions

Rear Panel

Figure

2-4

shows the rear panel

of

the instrument.

Figure 2-4: PS280

1.

These two switches allow you

voltage. Push the top switch

100

to

120

V;

push

it to

the right

•gggss

1

^

S

TEOTRONKINC,

BEAVEHTON.,OH,U.SA

1UKXTAIWAMJI.0.C

or

PS283 Rear Panel

to

set the instrument for the correct line

to

the left

if

the line voltage

If

the line voltage

is in

^

A©

s

is in

the range

y

the range

of

220

of

to

The bottom switch determines whether the line voltage

high end
the low end
voltage

2.

This

holder to ensure that you are using the correct fuse. This
change the fuse.

3. This

of

the voltage range. Push

of

the range-100

is at

the high end

is

the fuse holder. Pull the middle tab down and out

is

the receptacle for the power

of

the

or

220

range

it to

V;

-120

cord.

the left

push

or

it to

is

In the low or the

if

your line voltage

the right

240 V.

if

to

open the fuse

is

also how you

is at

your line

Operating Information

BBSftXfTTheory of Operation

WMSPXfXVtTirL

Theory

of Operation

General

Circuit Description

The PS280 or PS283 Laboratory DC Power Supply consists of two variable

output supplies and one 5 V fixed output. The circuit elements and their func-

tions are described in the Circuit Description, using the Block Diagram as an
aid in following the circuit description.

The detailed circuit description uses the block diagram, Figure
for the circuit description. The Block Diagram contains both the circuit compo­nent reference designators and lists the appropriate schematic on which they
can be found.

3-1

as a guide

Master Voltage Output

Single phase input power is applied to transformer

The outputs from transformer
relays

RL101
required from the Series Regulator by providing varying voltages to the Main
Rectifier circuit, depending on the output requirements.

The Main Rectifier circuit consists of diodes D1011 through D1014 that form a
full wave bridge rectifier. The output from the bridge rectifier is filtered by
capacitor
circuit.

and RL102. The relay control circuit limits the power dissipation

C102.

The filtered output voltage is applied to the Series Regulator

TS101

are applied to the Main Rectifier circuit by

TS101

through the AC input

The Series Regulator circuit consists mainly of

a regulated voltage to the Laboratory DC Power Supply Master output.

The Auxiliary Rectifier circuit consists of diodes 01021 through D1024 that
form a full wave bridge rectifier. The bias voltage from the bridge rectifier is
filtered by capacitors C103 and C104. This bias voltage is then applied to the

Reference Voltage circuit.

The Reference Voltage circuit consists of

ence circuit provides a regulated +15 V and -15 V to be used by the Current
Comparator circuit and the Reference Voltage Amplifier circuit.

The Current Comparator circuit, consisting of U105, limits the output current of
the Series Regulator circuit through OR gate and Amplifier circuit consisting of

D107,

and Q103 and Q104. Master CURRENT control, VR105, sets the maxi-

mum output current level.

P3280 & PS263 Laboratory DC Power Supply Module-Level Service Manual

U101,

Q1071

Q101,

REV AUG

and

R1261,

and Q102. This Refer-

1991

that deliver

Theory of Operation

The Reference Voltage Amplifier circuit consists mainly of U103, and the
Voltage Comparator circuit consists mainly of U104. U104 compares the
voltage from the Reference Voltage Amplifier with feedback from the output
voltage and, through diode D105 and the amplifier circuit of Q103 and Q104,

provides a calibrated output voltage.

The Tracking Selector switches (S501A and S501B), along with the Tracking

Delay circuit (U501 and U502), Relay Control circuit
and the Tracking Relays

(RL501,

RL502, and RL503) set the configuration of

(Q501,

Q502, and Q503),

the Master and Slave outputs.
The TRACKING Mode Switches set the Laboratory DC Power Supply in one of

three modes: INDEPendent Mode, SERIES tracking mode, or PARALLEL
mode.

The on/off conditions of relays

RL501,

RL502, and RL503 are shown

below, according to the operating mode selected.

Tracking Operation
Series Tracking

Parallel Tracking
Independent O/P

Off
On

Off

On
On

Off

Off
On

Off

When in the SERIES Tracking mode, The Master negative output is shorted to
the Slave positive output. Also, the Master output voltage provides the voltage

reference for the Reference Voltage Amplifier circuit, U303.

When in the PARALLEL Tracking mode, both the negative and positive outputs
from the Master outputs are shorted to the negative and positive outputs of the

Slave outputs. A reference voltage for Current Comparator U305 is provided

through R1261 from the Master supply circuit.

U501 and U502 are used to protect the Laboratory DC Power Supply from
instant high voltage/current during the switching time of the relay contacts.

Slave Voltage Output

The Slave output circuitry performs the same as described for the Master
Voltage output. The circuits are the same except for the component names.

Refer to the block diagram for appropriate component names of the Slave
output circuit.

REV

3-2

AUG1991

Theory of Operation

AC Input

Theory

of

Operation

Reference

Voltage Source

<2>

Current Comparator

Reference Voltage

Amplifier

Tracking Selector

Auxiliary Rectifier

and Filter

D1021-D1024

C103-C104

D105,

D107

Voltage Comparator

Tracking Delay

U501-U502

u

Transformer

O

Amplifier

Q103-Q104

Relay Control
Q501-Q503

Relay Control

RL101-RL102

JJ

Main Rectifier and Filter

D1011-D1014

u

Series Regulator

Q1071.R1261

Tracking

O/P Control

RL501-RL503

Master Output

Reference

Voltage Source

Current Comparator

Reference Voltage

Amplifier

Figure

Auxiliary Rectifier

and Filter

D3021-D3024

C303-C304

Main Rectifier and Filter

0302.

D307

Amplifier

Q303-Q304

'

A """"A

Voltage Comparator

3-1:

PS280 or PS283 Variable Outputs Block Diagram

3_JJ.

<3>

Relay Control

RL301-RL302

u

D3011-D3014

Series Regulator

Q3071.

R3261

Slave Output

P3280 & PS283 Laboratory

uu

power supply Module-Level Service Manual

REV

AUG

1991

Theory of Operation

5 V Fixed Voltage Output

AC Input

u\

Transformer

•

Current Comparator

The 12 V output from transformer
The Rectifier circuit consists of diodes D4011 through D4014 that form a full

wave bridge rectifier. The output from the bridge rectifier is filtered by capacitor

C401.

The filtered output voltage is applied to the Series Regulator circuit.

The Series Regulator circuit consists mainly of Q402 and R407, that deliver a
regulated voltage to the Laboratory DC Power Supply 5 V Fixed output.

The Current Comparator circuit, consisting of
the Series Regulator circuit through Q401.

Rectifier and Filter

D4011-D4014

<>

Series Regulator

andC401

Q402,

R407

TS101

is applied to the Rectifier circuit.

U401,

limits the output current of

5 V Fixed

Output

>

<2>

Figure 3-2: PS280 or PS283 5 V Block Diagram

REVAUG 1991

Theory of Operation

SIB Performance Verification

WMiMrWinnnnTL Preparation

Purpose - Use this procedure to verify that the Laboratory DC Power Supply
is in conformance with its specifications as listed in Section 1, Specifications.
It can also be used for incoming inspection of the Laboratory DC Power

Supply.

Performance Verification Interval

performed whenever the accuracy or functions of the power supply are
question.
performing the adjustments in Section 5, Adjustments.

Requirements

Performance address the following requirements.

for

Before you perform these performance verification procedures, you need to

Warm-up Period
The Laboratory DC Power Supply requires a 20 minute warm-up time in

20°C to 30°C environment before a performance verification

A performance verification should be used to verify the need for

Access

Cabinet removal is not required to perform any of these procedures

Test Equipment

Table

4-1

lists all the test equipment required to perform both the Performance
Verification procedures and the Adjustment Procedures for the PS280
Laboratory DC Power Supply.

-A

performance verification should be

is

made.

in

a

or

PS283

PS2S0 & P32S3 Laboratory DC rower supply Module-Level Service Manual

REV

AUG 1991

4.7

Preparation

Equipment Required

Item Number and
Description

1 Adjustment Tool

2 Multimeter, Digital

3 Resistive Load,

Vari-

4 Oscilloscope

5 Fixed Resistive

Loads Set

Minimum Requirements

Less than % inch
diameter and over 2
inches long

35
Accuracy

0 to 2 n, 30 Watts

50 MHz, 3% vertical
deflection accuracy

20 a, 30 Watts

10 a, 30 Watts

2 fl, 5 Watts

1 a, 30 Watts

7 a, 140 Watts

0.5 a, 5 Watts
15X1,70 Watts

30 a, 140 Watts

7.511,140

1.7 n, 20 Watts

30 a, 40 Watts
60 a, 70 Watts

The test equipment required for both the performance verification procedures

and the adjustment procedures for the Laboratory DC Power Supply are listed

Table

4-1:

Test

Equipment

Example

Tektronix part number

Purpose

Adjustments

003-0675-00

V,

4 A, ±0.1%

TEKTRONIX DM252

Tektronix part number

Adjustments

Adjustments

311-2494-00
TEKTRONIX 2225

Tektronix part number

Performance Verification

Performance Verification

118-8751-00

Watts

6 Mechanical Switch 60 Watts

REV

AUG

1991

Tektronix part number

260-2570-00

Performance Verification

Performance Verification

WMMPXfXlftnnr

Performance Tests

Constant Current
Load Regulation

Equipment Required: Digital multimeter and load resistors

Figure

4-1:

Constant Current Test Setup

1.

Check the Master current regulation

a. Set up the equipment:

• Disengage both TRACKING mode switches (both switches out) so
that the power supply is in the INDEPendent operating mode.

(INDEPendent

mode):

•*-i

RL1

• Set the Master AMPS/VOLTS meter selection switch to AMPS.

• Set the digital multimeter to measure a DC voltage of +

• Connect the digital multimeter to the + and - terminals of the

MASTER output.

• Set the Laboratory DC Power Supply MASTER VOLTAGE control
until the multimeter reads +25 V.

• Disconnect the multimeter from the power supply.

• Set the digital multimeter to measure a DC current of at least 1
amp (PS280) or 0.5 amps (PS283).

• Connect the multimeter, load resistors, and test switch to the
+ and - terminals of the Master output as indicated in Figure

See Table 4-2 for the appropriate values of the load resistors.

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

25

volts.

4-1.

Performance Tests

b.

Verify

the current regulation:

• Check that the output current level changes less than 0.2%
±3 mA while switching load resistor

Table 4-2: Load Resistor Values for Current Checks

RL1

in and out of the circuit

PS280

oae

M

INDEP

PARALLEL

2.

Check the Slave current regulation

a. Set up the equipment:

• Set the Slave AMPS/VOLTS meter selection switch to AMPS.

• Set the digital multimeter to measure a DC voltage of + 25 volts.

• Connect the digital multimeter to the + and - terminals of the
Slave output.

• Set the Laboratory DC Power Supply SLAVE VOLTAGE control
until the multimeter reads +25 V.

• 'Disconnect the multimeter from the power supply.

• Set the digital multimeter to measure a DC current of at least 1
amp (PS280) or 0.5 amps (PS283).

a Connect the multimeter, load resistors, and test switch to the

+ and - terminals of the Slave output as indicated in Figure

See Table 4^2 for the appropriate values of the load resistors.

RL1

20

D.,

30

10 a, 30

W

w

RL2

,5W

2O

,30W

in

(INDEPendent

20

10

RL1

a 30

a

so

mode):

PS283

W

w

RL2

2fl.5W

1

a

30

w

4-1.

REV AUG

1991

b.

Verify

3. Check the Master current regulation
a. Set up the equipment:

the current regulation:

• Check that the output current level changes less than 0.2%
±3 mA while switching load resistor

• Engage both TRACKING mode switches (both switches in) so that

the power supply is in the PARALLEL operating mode.

• Set the digital multimeter to measure a DC voltage of +

• Connect the digital multimeter to the + and - terminals of the
MASTER output.

• Set the Laboratory DC Power Supply MASTER VOLTAGE control
until the multimeter reads +25 V.

• Disconnect the multimeter from the power supply.

RL1

(PARALLEL

in and out of the circuit

mode):

25

volts.

Performance Verification

Performance Tests

• Set the digital multimeter to measure a DC current of at least
1 amp (PS280) or 0.5 amps (PS283).

• Connect the multimeter, load resistors, and test switch to the

+ and - terminals of the Master output as indicated in Figure

See Table 4-2 for the appropriate values of the load resistors.

b.

Verify

the current regulation:

• Check that the output current level changes less than 0.2%
±5 mA while switching load resistor

RL1

in and out of the circuit

4-1.

Constant Current
Ripple and Noise

Equipment Required: Oscilloscope and load resistors

Figure 4-2: Constant Current Ripple and Noise Test Setup

1.

Check the Master current ripple:

a. Set up the equipment:

• Disengage both TRACKING mode switches (both switches out) so
that the power supply is in the INDEPendent operating mode.

• Set the Master AMPS/VOLTS meter selection switch to VOLTS.

• Set the Laboratory DC Power Supply to+25 volts (using the

digital display).

• Connect the test oscilloscope and load resistors to the + and ­terminals of the Master output as indicated in Figure 4-2. See
Table 4-3 for the appropriate values of the load resistors.

b.

Verify

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

the current ripple:

• Check that the peak-to-peak ripple viewed with the test oscillo­scope is less than 2.5 mV.

REV AUG 1991

Performance Tests

c. Set up the

• Engage both TRACKING mode switches (both switches in) so that

d.

Verify

• Check that the peak-to-peak ripple viewed with the test oscillo-

e. Set up the

• Disengage the right TRACKING mode switch (switch out) so that

f.

Verify

• Check that the peak-to-peak ripple viewed with the test oscillo-

Table 4-3: Load Resistor Values for Ripple Checks

Mo,e
INDEP

equipment:

the power supply is in the PARALLEL operating mode.

the current ripple:

scope is less than 2.5 mV.

equipment:

the power supply is in the SERIES operating mode.

the current ripple:

scope is less than 5 mV.

15n,

RL

70W

PS280

0.5 n, 5 W

Rs

30

n, 40

PS283

RL

W

Rs

0.5 n,5W

PARALLEL

2.

Check the Slave current ripple:

7 a 140 W

a. Set up the equipment:

• Disengage both TRACKING mode switches (both switches out) so
that the power supply is in the INDEPendent operating mode.

• Set the Slave AMPS/VOLTS meter selection switch to VOLTS.

• Set the Laboratory DC Power Supply to +
digital display).

• Connect the test oscilloscope and load resistors to the + and -

terminals of the Slave output as indicated in Figure 4-2. See Table

4-3 for the appropriate values of the load resistors.

b.

Verify

the current ripple:

• Check that the peak-to-peak ripple viewed with the test oscillo­scope is less than 2.5 mV.

10n,

30w

15

a,70

25

volts (using the

W

0.5 fl,5W

REV AUG

1991

Performance Verification

Performance Tests

Constant Voltage
Regulation

Equipment Required: Digital multimeter and load resistors

Figure 4-3: Constant Voltage Test Setup

1.

Check the Master voltage regulation:

a. Set up the equipment:

• Disengage both TRACKING mode switches (both switches out) so

that the power supply is in the INDEPendent operating mode.

v

• Set the digital multimeter to measure a DC voltage of + 60 volts.

• Connect the digital multimeter and load resistors to the + and ­terminals of the Master output as indicated in Figure 4-3. See
Table 4-4 for the appropriate values of the load resistor.

b.

Verify

c. Set up the equipment:

d.

Verify

e. Set up the equipment:

the voltage output range:

• Check that the Laboratory DC Power Supply can be adjusted from
0 to 30 V.

• Engage the left TRACKING mode switch (switch in) and disen­gage the right TRACKING mode switch (switch out) so that the
power supply is in the SERIES operating mode.

the voltage output range:

• Check that the Laboratory DC Power Supply can be adjusted from

0 to 60 V.

• Engage both TRACKING mode switches (both switches in) so that

the power supply is in the PARALLEL operating mode.

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Performance Tests

f.

Verify

the voltage output range:

• Check that the Laboratory DC Power Supply can be adjusted from
0 to 30 V.

Table 4-4: Load Resistor Values for Voltage Checks

INDEP
SERIES

PARALLEL

5 V Fixed

2. Check the Slave voltage regulation:
a. Set up the equipment:

• Disengage both TRACKING mode switches (both switches out) so
that the power supply is in the INDEPendent operating mode.

• Set the digital multimeter to measure a DC voltage of +

• Connect the digital multimeter and load resistors to the + and ­terminals of the Slave output as indicated in Figure 4-3. See Table

•4-4

for the appropriate values of the load resistor.

b.

Verify

the voltage output range:

• Check that the Laboratory DC Power Supply can be adjusted from
0 to 30 V.

15 n,

30

a

7.5 n,

1.7 n,

PS280

RL

70 W
140 W

140 W
20 W

PS283

RL

30 n, 40 W
60 a, 70 W

15n, 70W

1.7 n, 20 W

30

volts.

REVAUG 1991

3. Check the 5 V Fixed voltage regulation:
a. Set up the equipment:

• Set the digital multimeter to measure a DC voltage of +5 volts.

• Connect the digital multimeter and load resistors to the 5 V FIXED
terminals. Use the test setup illustrated in Figure 4-3 and see
Table 4-4 for the appropriate values of the load resistor.

b.

Verify

the voltage output range:

• Check that the Laboratory DC Power Supply maintains an output

of5V, ± 0.25 V.

Performance Verification

WKSWXiAnnns Adjustment

WKSffiyWUinnnni Preparation

Requirements

Performance

This section contains information needed
Supply.

Description - The

• This general information about adjusting

• Written procedures

Purpose — This procedure
mance with
be used

Adjustment Interval - As a
performed every 2000 hours

for

ments

Before you perform this procedure, you need

Personnel

Adjustment Procedures

for

manually adjusting

is

its

specifications

to

optimize the performance

as

of

to

adjust your Laboratory DC Power

are

divided into

the

power supply.

the

power supply.

used

to

return

the

power supply

listed

in

Section 1, Specifications.

of

the power supply.

general rule, these adjustments should

operation

or

once a year

to

address the following require-

two

parts:

to

confor-

It

if

used infrequently.

can also

be

This procedure

is

only

to be

performed

by

trained service technicians.

Warm-up Period

This power supply requires a 20 minute warm-up time

environment before performing this adjustment procedure. Adjustments
formed before the operating temperature
adjustment.

has

stabilized may cause errors

in a

20°C

to

30°C

Access

Removal
Maintenance Section

of

the cover

is

required

for

instructions

to

adjust this power supply. Refer

on

how

to

remove the cover.

to the

Test Equipment

The test equipment required

Power Supply

is

listed in Table

to

adjust the PS280
4-1

on

page

4-2.

or

PS283 Laboratory

per-

in

DC

PS280 & PS283 Laboratory

DC

Power Supply Module-Level Service Manual

REV

AUG 1991

5-f

BK#%T%|7tr Adjustment Procedures

Independent Mode Equipment

See Figures 5-1 and 5-2 on pages 5-8 and 5-9 for adjustment locations used
in this procedure.

1.

Adjust the master voltage output:

a. Set up the equipment:

• Disengage both TRACKING mode switches {both switches out) so

• Set the Master AMPS/VOLTS meter selection switch to VOLTS.

• Set the digital multimeter to measure a DC voltage of ±16 mV.

• Set the Laboratory DC Power Supply MASTER VOLTAGE control

• Connect the digital multimeter to the + and - terminals of the

b.,, Make the zero volts adjustment:

• Adjust VR102 for a reading of-15 mV, within ± 15 mV on the

c. Set up the equipment:

Required:

that the power supply is in the INDEPendent operating mode.

to minimum (fully counterclockwise).

Master output.

multimeter.

Digital multimeter

• Set the digital multimeter to measure a DC voltage of ± 35 v.

• Set the MASTER VOLTAGE control to maximum (fully clockwise).

d.

Make the maximum volts adjustments:

• Adjust VR101 for a reading of 31.5 V on the multimeter.

• Adjust VR201 until the Laboratory DC Power Supply meter dis­plays 31.5 V.

2.

Adjust the slave voltage output:

a. Set up the equipment:

• Disengage both TRACKING mode switches (both switches out) so
that the power supply is in the INDEPendent operating mode.

• Set the Slave AMPS/VOLTS meter selection switch to VOLTS.

• Set the digital multimeter to measure a DC voltage of ±16 mV.

• Set the Laboratory DC Power Supply SLAVE VOLTAGE control to
minimum (fully counterclockwise).

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV

AUG 1991

5.3

Adjustment Procedures

• Connect the digital multimeter to the + and - terminals of the
Slave output.

b. Make the zero volts adjustment:

• Adjust VR302 for a reading of-15 mV, within ± 15 mV on the
multimeter.

c. Set up the equipment:

• Set the digital multimeter to measure a DC voltage of ± 35 V.

• Set the SLAVE VOLTAGE control to maximum (fully clockwise).

d.

Make the maximum volts adjustments:

• Adjust

• Adjust

VR301

VR601

for a reading of 31.5 V on the multimeter.
until the Laboratory DC Power Supply meter dis-

plays 31.5V.

3. Adjust the master current output:
a. Set up the equipment:

• Disengage both TRACKING mode switches (both switches out) so
that the power supply is in the INDEPendent operating mode.

• Set the Master AMPS/VOLTS meter selection switch to AMPS.

• Set the digital multimeter to measure a DC current of 2 A.

•, Connect the digital multimeter to the + and - terminals of the
Master output. .

• Set the MASTER CURRENT control to maximum (fully clockwise).

b. Make the current adjustments:

• Adjust VR103 for a reading of 1.05 A (PS283) or

the multimeter.

• Adjust VR202 until the Laboratory DC Power Supply meter dis-

plays 1.05 A (PS283) or

2.1

A (PS280).

2.1

A (PS280) on

5-4

REV AUG1991

4.

Adjust the slave current output:

a. Set up the equipment:

• Disengage both TRACKING mode switches (both switches out) so

that the power supply is in the INDEPendent operating mode.

• Set the Slave AMPS/VOLTS meter selection switch to AMPS.

• Set the digital multimeter to measure a DC current of 2 A.

• Connect the digital multimeter to the + and - terminals of the

Slave output.

• Set the SLAVE CURRENT control to maximum (fully clockwise).

Adjustment

b. Make the current adjustments:

Adjustment Procedures

Series Tracking

Mode

• Adjust VR303 for a reading of 1.05 A (PS283) or
the multimeter.

• Adjust VR602 until the Laboratory DC Power Supply meter dis­plays 1.05 A (PS283) or

Disconnect the test setup.

Equipment Required: Digital multimeter
See Figures

in this procedure.

1.

Adjust the series tracking Mode:

a. Set up the equipment:

5-1

and 5-3 on pages 5-8 and 5-9 for adjustment locations used

• Engage the left TRACKING mode switch (switch in) and disen­gage the right TRACKING mode switch (switch out) so that the
power supply is in the SERIES operating mode.

• Set the SLAVE CURRENT control to midrange.

• Set the MASTER VOLTAGE control to minimum (fully
counterclockwise).

2.1

A (PS280).

2.1

A (PS280) on

«. • Set the digital multimeter to measure a DC voltage of ±16 mV.

• Connect the digital multimeter to the + and - terminals of the
Master output and note the reading obtained.

• Connect the digital multimeter to the + and - terminals of the

Slave output.

b. Make the zero voltage tracking adjustment:

• Adjust VR306 until the voltage output of the SLAVE output matches
the reading obtained from the MASTER output.

c. Set up the equipment:

• Set the MASTER VOLTAGE control to maximum (fully clockwise).

• Set the digital multimeter to measure a DC voltage of ± 35 V.

• Connect the digital multimeter to the + and - terminals of the
Master output and note the reading obtained.

• Connect the digital multimeter to the + and - terminals of the

Slave output.

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Adjustment Procedures

d.

Make the maximum voltage tracking adjustment:

• Adjust

Recheck the value of the Master output compared to the value of

the Slave output. Readjust

Disconnect the test setup.

Parallel Tracking Equipment

ModG See Figure

1.

Adjust the parallel tracking Mode:

a. Set up the

• Disengage both TRACKING mode switches (both switches out) so

• Set the MASTER VOLTAGE and CURRENT controls to minimum

VR501

the reading obtained from the Master output.

until the voltage output of the Slave output matches

wore

VR501

Required:

5-1

on page 5-8 for adjustment locations used in this procedure.

that the power supply is in the INDEPendent operating mode.

(fully counterclockwise).

Digital multimeter

equipment:

if the outputs do not match.

• v Set the digital multimeter to measure a DC current of 4 A.

• Connect the digital multimeter to the + and - terminals of the
Master output.

• Set the MASTER VOLTAGE control to midrange and adjust the
MASTER CURRENT control until a reading of 1 A (PS283) or 2 A
(PS280) is displayed on the multimeter.

NOTE

Do not readjust the
of this procedure.

• Engage both TRACKING switches (both switches in) so that the

power supply is in the PARALLEL operating mode.

• Set the SLAVE CURRENT control to maximum (fully clockwise)
and set the SLAVE VOLTAGE control to midrange.

b. Make the parallel tracking adjustment:

• Adjust VR502 until a reading of 2 A (PS283) or 4 A (PS280) is

displayed on the multimeter.

CURRENT

control setting through the remainder

5-6

REV AUG1991

Disconnect the test setup.

Adjustment

5 V

Fixed Equipment

See Figure 5-1 on page 5-8 for adjustment locations used in this procedure.

1.

Adjustment Procedures

Required:

Adjust the 5 V fixed output:

a. Setup the equipment:

• Set the digital multimeter to measure a DC voltage of + 5.25 V.

• Connect the digital multimeter to the terminals of the 5 V Fixed
output.

b. Make the 5 V adjustment:

Digital multimeter

and

variable resistive load

• Adjust

c. Set up the equipment:

• Disconnect the multimeter from the Laboratory DC Power Supply.

• Set the digital multimeter to measure a DC current of 3.25 A.

• Adjust VR403 fully counterclockwise.

• Connect a variable load and the multimeter in series to the termi-

• Adjust the variable load until the multimeter displays 3.25 A.

• Disconnect the multimeter from the power supply and reconnect
the 5 V Fixed output.

• Set the digital multimeter to measure a DC voltage of + 5.25 V.

• Connect the digital multimeter to the terminals of the 5 V Fixed

d.

Make the current limit adjustment:

• Slowly adjust VR403 clockwise until the multimeter display shows
a voltage drop of 5 to 6 mV.

e. Set up the equipment:

VR401

nals of the 5 V Fixed output.

the variable load (without changing the setting) to the terminals of

output.

until the multimeter displays 5.00 V (± 0.25 V).

• Disconnect the digital multimeter and the variable load from the
power supply.

• Set the digital multimeter to measure a DC current of 3.25 A.

• Connect a variable load and the multimeter in series to the termi­nals of the 5 V Fixed output.

• Adjust the variable load until the multimeter displays 3.10 A.

f. Make the overload adjustment:

• Adjust VR402 until the OVERLOAD 5V3A indicator starts to light on
the Laboratory DC Power Supply.

Disconnect the test setup.

P32S0 & PS2S3 Laboratory DC Power Supply Module-Level Service Manual

REV

AUG 1991

5.7

Adjustment Procedures

Master

Maximum

Master

Maximum

a'iiliM!!

O

O^

-• 8 = ~

0 I Ill+lfl

oo

+

Master

Minimum

Parallel

5 V Overload

Mi+0+riiJS^

VR303 VR301 VR306 VR302

Slave Slave Serial Slave

Maximum Maximum Minimum Volts Minimum

Amps Volts Volts

Figure

5-1:

Master Circuit Board Adjustment Locations

5V Amps

REV AUG

1991

Adjustment

Adjustment Procedures

| J2021 | | J2041

1 1

T

T

-\-

Display Maximum Maximum

Voltage Amps Amps

Tracking

Voltage

J207 J205

L

J20B^-^J206

nup

11

o

1 ^111

1 1

-

t

'

\\\\

VR601 VR602 VR202

Slave Slave Master

Figure 5-2: Display Assembly Circuit Board Adjustment Locations

T T

I T ^r

o

+

L

/-O

Display
Voltage

U

* oo • *r

Figure 5-3: Front Panel Controls Circuit Board Adjustment Locations

1

1

1

1

u-ir-

1

^

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

5-9

#%F%M_n_nj Maintenance

IHBllWXFlnnnJirL Information

Helpful Procedures

This section contains the information
nance on the Laboratory DC Power Supply. This section of the manual con­tains information on static-sensitive components, preventive maintenance,
removal and installation procedures.

The following sections contain information/procedures that may be related
doing maintenance.

• Section 2, Operating Information, covers instructions useful when operat­ing the oscilloscope in order to troubleshoot it.

strategy and lists options for obtaining maintenance service and for re­placing failed modules.

• Section 3, Theory
ule,

or block level.

• Section 4, Performance Verification, contains procedures that may
useful

in

isolating problems to modules by testing power supply perform-

• Section 5, Adjustment Procedures, addresses after repair adjustment and

thevinterval between periodic adjustments.
adjusting the internal circuits of this power supply.

of

Operation, contains a circuit description at the mod-

to do

periodic and corrective mainte-

It

also details the service

It

contains a procedure for

and

to

be

Preventing ESD

• Section 9, Diagrams, contains the schematics of the individual circuit
boards.

• Section 8, Replaceable
number and contains the exploded views of the power supply.

The following precautions apply when performing any maintenance involving

internal access to the instrument.

Static discharge can damage any semiconductor component in this

instrument.

This instrument contains electrical components that are susceptible to dam­age from static discharge. Table 6-1 lists the relative susceptibility of various
classes
unprotected environments.

of

semiconductors. Static voltages

Parts,

lists all field replaceable modules by part

of 1 kV to 30 kV are common

in

PS28Q & PS2S3 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

6-1

Information

When performing maintenance, observe the following precautions to avoid

component damage:

1.

Minimize handling of static-sensitive components.

2.

Transport and store static-sensitive components or assemblies in their

original containers or on a metal
static-sensitive components or modules.

3. Discharge the static voltage from your body by wearing a grounded
antistatic wrist strap while handling these components. Servicing static­sensitive components or assemblies should be performed only at a
static-free work station by qualified service personnel.

4.

Nothing capable of generating or holding a static charge off the work

station surface.

5. Keep the component leads shorted together whenever possible.

6. Pick up components or modules by their bodies, never by their leads.

7. Do not slide the components or modules over any surface.

8. Avoid handling components or modules in areas that have a floor or

work-surface covering capable of generating a static charge.

rail.

Label any package that contains

9. Use a soldering iron that is connected to earth ground.

10.

Use only approved antistatic, vacuum-type desoldering tools for compo-

nent removal.

G-2 Maintenance

Table

6-1:

Relative Susceptibility to Static-discharge Damage

Information

Semiconductor Classes

MOS or CMOS microcircuits or discretes, or linear
microcircuits with MOS inputs (Most Sensitive)

ECL
Schottky signal diodes

Schottky TTL

High-frequency bipolar transistors

JFET

Linear microcircuits

Low-power Schottky TTL

TTL (Least Sensitive)

1

Voltage equivalent for levels (voltage discharged from a 100 pF capacitor through resis-

tance of 100 fl):

1 =

100

to 500 V 6 =
2 = 200 to 500 V 7 =
3 = 250 V 8 =

4 = 500 V 9 = 1200

5 = 400 to 600

V

600
400

900 V

to

800 V

to

1000 V

V

(est)

Relative

Susceptibility

Levels

1

1

2

3
4
5

6
7
8

9

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual REVAUG 1991

WMMPXlWU~ Inspection and Cleaning

Inspection and Cleaning describes how to inspect for dirt and damage on,

and how to clean the exterior and interior of, the Laboratory DC Power Supply.
Such inspection and cleaning are performed as preventative maintenance.
Preventive maintenance, when performed regularly, may prevent instrument
malfunction and enhance reliability.

Preventive maintenance consists of visually inspecting and cleaning the power

supply and using general care when operating it.
The severity of the environment in which the power supply is used determines

the required frequency of maintenance. An appropriate time to perform preven-

tive maintenance is just before power supply adjustment.

General Care

Inspection
Cleaning Procedures

and The Laboratory DC Power Supply should be visually inspected and cleaned

The cabinet minimizes accumulation of dust inside the Laboratory DC Power
Supply and should normally be in place when operating the power supply.

as Ofte" as

supply can cause overheating and component breakdown. Dirt on compo­nents acts as an insulating blanket, preventing efficient heat dissipation. It
also provides an electrical conduction path that could result in instrument
failure,

especially under high-humidity conditions.

Avoid the use of chemical cleaning agents which might damage the
plastics used in this power

cleaning the front
cieaner and rinse with deionized
of

cleaner,

eratin

°P

consult your

9 conditions require. Accumulation of dirt in the power

panel.

supply.

Use a 75% isopropyl alcohol solution as a

Tektronix

Use only deionized water when

water.

Before using any other type

Service Center or representative.

Inspect Exterior

Inspection - Inspect the outside of the power supply for damage, wear, and
missing parts, using Table 6-2 as a guide. Instruments that appear to have
been dropped or otherwise abused should be checked thoroughly to verify
correct operation and performance. Immediately repair deficiencies that could

cause personal injury or lead to further damage to the power supply.

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REVAUG 1991

Inspection and Cleaning

To

prevent getting moisture Inside the power supply during external

cleaning, use only enough liquid to dampen the cloth or

Table 6-2: External Inspection Check List

applicator.

Inspect For

Cabinet and Front

Front-panel Knobs Missing, damaged, or loose knobs.

Connectors

Accessories

Cracks, scratches, deformations,
damaged hardware.

Broken shells, cracked insulation, and
deformed contacts. Dirt in connectors.

Missing items or parts of items, broken or
frayed cables, and damaged connectors.

Cleaning Procedure — Exterior

1.

Remove loose dust on the outside of the power supply with a lint free

2.

Remove remaining dirt with a lint free cloth dampened in a general pur-

pose detergent-and-water solution. Do not use abrasive cleaners.

3. Clean the digital display with a lint-free cloth dampened with either isopro­pyl alcohol or, preferably, a gentle, general purpose detergent-and-water
solution.

Repair Action
Replace defective module.

Repair or replace missing or defective

knobs.

Replace defective modules. Clear or wash

out dirt.
Replace damaged or missing items, frayed

cables, and defective modules.

REV AUG

1991

Inspect Interior

To access the inside of the power supply for inspection and cleaning, refer to
the Removal and Installation Procedures in this section.

Inspect the internal portions of the power supply for damage and wear, using

Table 6-3 as a guide. Deficiencies found should be repaired immediately.

If any electrical module is replaced, the performance verification procedures
should be used to see If it is necessary to adjust the power supply.

To

prevent damage from electrical arcing, ensure that circuit boards

and components are dry before applying power to the power

supply.

Maintenance

Table 6-3: Internal Inspection Check List

Inspection and Cleaning

Inspect For

Circuit Boards

Loose,

broken, or corroded solder
connections. Burned circuit boards.
Burned,

broken, or cracked

circuit-run plating.

Resistors

Burned,

cracked, broken, blistered.

Solder Connections Cold solder or rosin joints.

Capacitors Damaged or leaking cases.

Corroded solder on leads or
terminals.

Semiconductors Loosely inserted in sockets.

Distorted pins.

Wiring and Cables

Chassis

Loose plugs or connectors. Burned,

broken,

or frayed wiring.

Dents, deformations, and damaged
hardware.

Repair Action

Remove failed module and replace with a

fresh module.

Replace failed module and replace with a

fresh module.
Resolder joint and clean with isopropyl

alcohol.
Remove damaged module and replace with a

fresh module from the factory.

Firmly seat loose semiconductors. Remove
devices having distorted pins. Carefully

straighten pins (as required to fit the socket),
using long-nose pliers, and reinsert firmly.
Ensure that straightening action does not
crack pins, causing them to break off.

Firmly seat connectors. Repair or replace
modules with defective wires or cables.

Straighten,

repair,

or replace defective

hardware.

Cleaning Procedure - Interior

If, after doing steps 1 and 2, a module is clean upon inspection, skip

I|J

the remaining steps.

1.

Blow off dust with dry, low-pressure, deionized air (approximately 9 psi).

2.

Remove any remaining dust with a lint free cloth dampened in a 75%

isopropyl alcohol solution and rinse with a warm deionized
cotton-tipped applicator is useful for cleaning in narrow spaces and on

circuit boards.)

3. If steps 1 and 2 do not remove all the dust or dirt, the power supply may
be spray washed using a solution of 75% isopropyl alcohol by doing
steps 4 through 8.

4.

Gain access to the parts to be cleaned by removing easily accessible

shields and panels (see Removal and Installation Procedure).

water.

(A

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

6-7

Inspection and Cleaning

5. Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for
the majority of the alcohol to evaporate.

6. Use hot (120°F to 140°F) deionized water to thoroughly rinse them.

7. Dry all parts with low-pressure, deionized air.

8. Dry all components and assemblies in an oven or drying compartment
using low-temperature (125°Fto 150°F) circulating air.

Lubrication

There is no periodic lubrication required for this power supply.

6"8

Maintenance

IHH1 Removal and Installation Procedures

The procedures in this subsection provide instructions on how to remove the
replaceable circuit board modules in the PS280 or PS283Laboratory DC Power
Supply for either cleaning or replacement of a failed module. Replacement
part numbers of each circuit board module can be found In the section 8, Parts

Preparation - , .
Please Read 1

Before performing this or any other procedure in this manual, read
the

Safety
prevent possible injury to service personnel or damage to this
power supplies's components, read Preventing ESD in this section.

This subsection contains the following:

Summary found at the beginning of this manual. Also, to

WARNING

|

• This preparatory information that you need to properly perform the
procedures that follow.

• List of Equipment required to remove and disassemble all modules.

• Disassembly procedures for removal of all the major modules from the
power supply at one time and for reassembly of those modules into the
power supply. Such a complete disassembly is normally only done when
completely cleaning the power supply. (Instructions for doing the actual
cleaning are found under Inspection and Cleaning at the beginning of this
section.)

• Module locator diagrams for finding all the modules in this power supply.

WARNING

Before performing any procedure in this subsection, disconnect the
power cord from the line voltage source. Failure to do so could

cause serious injury or death.

u

List of Modules

Section 8 lists all modules.

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual 6-9

Removal and Installation Procedures

General Instructions

READ THESE GENERAL INSTRUCTIONS BEFORE REMOVING A

MODULE.

The removal of any internal module first requires the removal of the
top cover. Instructions for the removal of the top cover can be found

on page 6-10.

When unplugging connectors from any circuit board, always label

each one as you unplug them. This will ensure that each connector is

returned to its proper location and avoid damage to the Laboratory DC

Power Supply.

Equipment Required - The modules in this power supply can be removed
with a standard Phillips-head screwdriver. This and other items that are need­ed for complete disassembly of the instrument are listed in Table 6-4.

Top Cover Removal

Table 6-4: Tools Required for

Name

Module Removal

Description

No"

1
2
3

4

Phillips-head screwdriver

Flat-blade screwdriver

,. Soldering Iron

Solder Wick

Standard tool
Standard tool
Standard tool
Standard tool

The top cover needs to be removed to gain access to all replaceable modules

in the PS280 or PS283 Laboratory DC Power Supply. See Figure 6-1 illustrating

the removal of the top cover.

1.

Remove the two screws attaching the handle to the cover and remove the

handle.

2.

Remove the two screws on the left side and the three screws on the right

side of the power supply.

3. Slide the cover slightly back from the front panel and lift off.

REV

AUG

1991

Maintenance

Removal and Installation Procedures

Figure

6-1:

Top Cover Removal

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Removal and Installation Procedures

Slave Circuit Board
Removal

The Slave Circuit board is located on the left side of the power supply when
viewed from the front. See Figure 6-2 for the location of the Slave circuit board.
To aid in locating the connectors referred to in this procedure, see Figure 9-2

in the Diagrams section.The removal of other circuit boards is not necessary

to perform this procedure.

NOTE

Remember to label each connector as you disconnect them.

1.

Unplug J301 from the Slave circuit board.

2.

Unplug J3023 and J1023 from the Slave circuit board.

3. Unplug J1111 from the Slave circuit board.

4.

Unplug J1033 from the Slave circuit board.

5. Unplug J101 from the Slave circuit board.

6. Unplug

7. Remove the two screws, lock washers, and flat washers securing the
circuit board.

8. Tilt the Slave circuit board out slightly and unsolder the two individual

wires at locations

J1101

from the Slave circuit board.

S1

and S2.

9. Tilt thevSlave circuit board further out and unsolder the two individual wires
at locations

10.

Remove the circuit board by lifting it up and out of the bottom chassis

board slots.

11.

Installation of the Slave circuit board is done in the reverse order noting

the following items:
a. Make certain not to pinch any wires underneath the circuit board.
b. The wires from

through the cut-out in the bottom of the board.

c. Make certain that the circuit board is sitting in the circuit board slots in

the bottom chassis.

M1

and M2.

J101

at the bottom of the circuit board should pass

REV AUG

1991

Maintenance

Removal and Installation Procedures

Fuse Circuit Board
Removal

PS280 & PS283 Laboratory

DC

Figure 6-2: Slave and Fuse Circuit Board Removal

The Fuse circuit board is located at the left rear of the power supply. See

Figure 6-2 for the location of the Fuse circuit board. To aid in locating the
connectors referred to in this procedure, see Figure 9-7 in the Diagrams sec-

tion.

The removal of other circuit boards is not necessary to perform this

procedure.

NOTE

Remember to label each connector as you disconnect them.

Power Supply Module-Level Service Manual

REV AUG

1991

Removal and Installation Procedures

1.

Unplug all connectors from the Fuse circuit board.

2.

Remove the two screws, lock washers, and flat washers securing the top

of the circuit board.

3. Remove the screw, lock washer, and flat washer securing the right bottom
comer of the circuit board. See note below.

wore

Removal of the screw in step 3 may be difficult. Removing the

appropriate screw from the rear of the power

stand-off post between the circuit board and

4.

With a pair of pliers, pinch the board retainer, located at the bottom left, so

that the circuit board can be pulled loose.

supply,

heatsink,

securing the

Is

easier.

AC Selector Circuit
Board Removal

Returning the connectors to Improper locations may damage the
Laboratory DC Power Supply when power is applied.

5. Installation of the Fuse circuit board is done in the reverse order.

The AC Selector circuit board is located at the left rear of the power supply
behind the Fuse circuit board. See Figure 6-3 for the location of the AC Selec­tor circuit board. To aid in locating the connectors referred to In this procedure,
see Figure 9-8 in the Diagrams section. The removal of the Fuse circuit board
is necessary before proceeding with this procedure.

NOTE

Remember to label each wire as you disconnect them.

1.

Remove the four self-tapping screws from the rear panel securing the AC

selector circuit board.

NOTE

REV AUG

1991

The next two steps involve unsoldering eight
colors of the wires are duplicated but are NOT interchangeable.
Make certain that each wire is returned to its proper location. The
colors of the wires mentioned in this procedure are subject to
change due to vendor component manufacturing.

wires.

Some of the

Maintenance

Removal and Installation Procedures

2.

Unsolder the four wires located at the top of the circuit board.

• The black wire is soldered to "0"

-AC

Selector Circuit Board

• The gray wire is soldered to "

100"

• The orange wire is soldered to "120"

• The white wire is soldered to "N"

3. Unsolder the four wires located at the bottom of the circuit board.

• The black wire Is soldered to "0"

• The gray wire is soldered to "100"

• The orange wire is soldered to "120"

• The black wire from the power switch is soldered to "TO J601"

4.

Installation of the AC Selector circuit board is done in the reverse order.

Figure 6-3: AC Selector and Master Circuit Board Removal

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

Master Circuit Board

1991

Removal and Installation Procedures

Master Circuit Board
Removal

The Master circuit board is located on the right side of the power supply. See

Figure 6-3 for the location of the Master circuit board. To aid in locating the

connectors referred to in this procedure, see Figures
Diagrams section. The removal of other circuit boards is not necessary to
perform this procedure.

NOTE

Remember to label each connector

1.

Unplug J1082 and J3082 from the Front Panel Controls circuit board.

2.

Unplug J3052 and J1102 from the Master circuit board.

3. Unplug

4.

Unplug J106 and J402 from the Master circuit board.

5. Unplug J403 from the Master circuit board.

6. Unplug

7. Unplug J206 and J208 from the Front Panel Display circuit board.

8. Cut the cable ties attached to the wires from
Master circuit board.

J1071,

J1111

J1052,

from the Slave circuit board.

J4041,

and J306 from the Master circuit board.

as

you disconnect them.

9-1,

J1081

9-2, and 9-5 in the

and

J3081

on the

9. Remove the two screws, lock washers, and flat washers securing the top

of the circuit board.

10.

Remove the circuit board by lifting it up and out of the bottom chassis

board slots.

11.

Installation of the Master circuit board is done in the reverse order noting

the following items;
a. Make certain not to pinch any wires underneath the circuit board.
b. Make certain that the circuit board is sitting in the circuit board slots in

the bottom chassis.

REVAUG 1991

Maintenance

Removal and Installation Procedures

Front Panel Display
Circuit Boards

Assembly Removal

The Front Panel Display circuit boards assembly consists of two boards
removed as a unit. These are located at the front of the power supply, just
behind the digital display. See Figure 6-4 for the location of the Front Panel
Display circuit boards. To aid in locating the connectors referred to in this
procedure, see Figure 9-5 in the Diagrams section. The removal of the Master
circuit board and the Slave circuit boards make for easier access to the Front
Panel assembly but is not required. Removal of the top center and top right
chassis rails also make for easier access to the Front Panel Display assembly

but is not required.

wore

Remember to label each connector as you unplug them.

1.

Unplug J1044 and J1043 from the Front Panel assembly.

2.

Unplug J207, J205, J208, and J206 from the Front Panel assembly.

3. With a pair of pliers, squeeze the tabs on the 5 plastic circuit board fasten­ers to release the outer circuit board.

4.

Remove the six thread forming screws securing the inner circuit board to

the front panel of the power supply.

5. Lift out the two circuit boards as a unit.

6. Install the Front Panel Display assembly in the reverse order.

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

Removal and Installation Procedures

REV AUG

Figure 6-4: Front Panel Display Assembly Removal

1991

Maintenance

Removal and Installation Procedures

Front Panel Controls
Circuit Board
Removal

The Front Panel Controls circuit board Is located at the front of the power
supply. See Figure 6-5 for the location of the Front Panel Controls circuit
board.

To aid in locating the connectors referred to in this procedure, see
Figure 9-5 in the Diagrams section. The removal of other circuit boards is not
necessary to perform this procedure.

NOTE

Remember to label each connector as you disconnect them.

1.

Unplug connectors J3082, J5012, J1082, and J4043 from the Front Panel

Controls circuit board.

2.

Remove the CURRENT and VOLTAGE control knobs of both the MASTER

and SLAVE outputs by pulling them straight out.

3. Remove the nuts and washers from each of the four shafts.

4.

Slide the circuit board back, and lift out of the power supply.

5. Installation of the Front Panel Controls circuit board is done in the reverse

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Removal and Installation Procedures

REV AUG

1991

Figure 6-5: Front Panel Controls Assembly

Maintenance

Removal and Installation Procedures

Output Connectors
Circuit Board
Removal

The Output Connectors circuit board is located at the front of the power sup-

ply. See Figure 6-6 for the location of the Output Connectors circuit board. To

aid in locating the connectors referred to in this procedure, see Figure 9-1 in

the Diagrams section. The removal of other circuit boards is not necessary to

perform this procedure.

wore

Remember to label each connector as you disconnect them.

1.

Unplug connectors J106,

2.

Pull off the plastic cover over the power switch, located at the bottom left

of the front panel. This can be done by carefully prying the power switch
cover off with a small flat-blade screwdriver.

3. Remove the two screws securing the power switch.

4.

Remove the two screws that secure the entire front panel to the bottom

chassis of the power supply.

5. Slide the front panel forward, away from the bottom chassis.

6. Unplug the green ground wire from the chassis connector.

J4041,

J402, and J306 from the Master circuit

7. Remove the six tread forming screws securing the circuit board to the front

8. Installation of the Output Connectors circuit board is done in the reverse

PS280

& PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Removal and Installation Procedures

Figure 6-6: Output Connectors Circuit Board and Power Switch Location

REV AUG

1991

Maintenance

Removal and Installation Procedures

Power Transistor
Circuit Boards
Removal

The Power Transistor circuit boards are attached to the heat sink at the rear of
the instrument. See Figure 6-7 for the location of the Power Transistor circuit

boards. To aid in locating the connectors referred to in this procedure, see
Figure 9-6 in the Diagrams section. The removal of other circuit boards is not

necessary to perform this procedure.

1.

Unplug connector

circuit board you are removing.

2.

Remove the two screws securing each power transistor to the heat sink

and circuit board.

3. Unsolder the leads of the power transistors from the circuit board.

4.

Remove the power transistors from the power supply.

5. Remove the circuit board from the power supply.

6. Installation of the Power Transistor circuit board is done in the reverse

J1051

or

J3051,

depending on which Power Transistor

Slave Power

Transistor

Circuit Board

Figure 6-7: Power Transistor Circuit Boards Location

PS280

& PS283 Laboratory DC Power Supply Module-Level Service Manual

Master Power

Circuit Board

REV AUG

Transistor

1991

•nW^WnnrLnn Options

^.-

fMXlWUl. Options and Accessories

Power Cord Options

Some accessories are included with the PS280 or PS283. If you wish to pur­chase additional accessories, either optional or standard, see a Tektronix
products catalog, contact your local Tektronix field representative, or, in the
U. S., call the Tektronix National Marketing Center toll-free at 1-800-426-2200.

Option

AO

North American 120 V/6 A, 60 Hz, Tektronix part number

161-0248-00.
Option

A1

universal European 220 V/6 A, 50 Hz, Tektronix part number

161-0104-06.
Option A2 United Kingdom 240 V/6 A, 50 Hz, Tektronix part number

161-0104-07.
Option A3 Australian 120 V/6 A, 50 Hz, Tektronix part number 161-0104-05.
Option A4 North American 220 V/10 A, 60 Hz, Tektronix part number

161-0104-08.

Option A5 Switzerland 240 V/6 A, 50 Hz, Tektronix part number

161-0167-00.

Standard

Accessories

Optional Accessories "

The

PS280

(Tektronix part number 070-8355-00) is this manual.
Power cord Option A0 North American 120 V/6 A, 60 Hz (Tektronix part

number 1610248-00). See the section below for other power cords, which
can be ordered optionally.

three pairs of black and red test leads (Tektronix part number

196-3201-00).

The PS280 or

nix part number 070-8356-00) provides service information for maintenance
and repair of the PS280 or PS283 Laboratory DC Power Supply.

Any additional power cords for other countries.

or

PS283

PS283

Laboratory DC Power Supply Operator Manual

Laboratory DC Power Supply Service Manual (Tektro-

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

B^SmXJAnnnn. Parts List

mSSMJffinruinjTr

pans

ust

This section contains the list
or PS283 Laboratory DC Power Supply. These modules
tion

of

mechanical and electrical subparts.
identify and order replacement parts. Figures 8-1 and
ploded view

Parts Ordering Replacement parts are available from or
Information service center

Changes

improved components as they become available and
of the latest circuit improvements. Therefore, when ordering parts,

tant

to

• Part number

• Instrument type

• Instrument serial number

• Instrument modification number,

If a part you order has been replaced with a different
local Tektronix service center

change

of

all replaceable components.

or representative.

to

Tektronix instruments

include the following information

or

in

the part number.

of

replaceable modules that make up the PS280

are

model number

or

representative will contact you concerning

sometimes made

if

applicable

are

often a combina-

As

described below, use this list

8-2

provides

through

in

your local Tektronix,

to

your order:

or

to

accommodate

give you the benefit

improved part, your

an ex-

Inc.,

it is

impor-

to

any

PS280 & PS283 Laboratory

Module Replacement

The PS280

new, replacement modules

DC

Power Supply Module-Level Service Manual REVAUG

or

PS283

is

serviced

by

module replacement. You may purchase

in

the same way

as

other replacement parts.

1991

8-7

Parts List

Using the Parts List

The

tabular information in the Parts List is arranged for quick
standing the structure and features of the list will help you find the all the
information you need for ordering replacement parts.

retrieval.

Item Names

Because
incomplete. For further Item Name identification, use the U.S. Federal Catalog-

ing Handbook

of

space limitations,

H6-1,

where available.

an

Item Name may sometimes appear

Indentation System

Indentation in this parts list shows the relationship between items. The follow­ing

is

an example

12

3 4 5

Assembly and/or Component

Attaching parts for Assembly and/or Component

Detail Part of Assembly and/or Component
Attaching parts

Parts
Attaching parts

of

the indentation system used in the Description column:

Name & Description

(END ATTACHING PARTS)

for

Detail Part

(END ATTACHING PARTS)

of

Detail Part

for

Parts

of

Detail Part

(END ATTACHING PARTS)

Under-

as

Attaching parts always appear

while the detail parts

included
separately, unless otherwise specified.

with,

the next higher indentation. Attaching parts must

are

at

indented

the same indentation as the item

to

the right. Indented items are part

Abbreviations

Abbreviations conform

dard

Y1.1.

to

American National Standards Institute (ANSI)

it

mounts,

be

purchased

of, and

stan-

8-2

REV AUG1991

Parts

Ust

Parts List

Index Tektronix
No.

Part No.

8-1-1 200-3999-00

-2 367-0441-00

-3 211-0452-00

-4 211-0428-00

-5 213-0717-00

-6 118-8707-00
118-8749-00

148-0251-00
148-0251-00
148-0251-00

210-1025-00
210-0577-00
366-2172-00
211-0452-00
213-0119-00
118-8708-00

150-0154-00
150-0155-00
150-0154-00
150-0155-00
150-0154-00

Serial/Assembly No.

Effective Dscont

Qty. Name & Description

1 COVER.TOP
1 HANDLE W/END CAPS
5 SCREW,MACHINE,M3 X 0.5
2 SCREW.ASSEM WSHR.M3 X 0.5
6 SCREW,4-20.0.312,PNH THREAD FORMING
1 OUTPUT CIRCUIT BOARD

(PS280)
OUTPUT CIRCUIT BOARD
(PS283)

(ATTACHING PARTS)
.C405 CSE1 25V, 100UF
.C1151 CSE1 50V.100UF
.C1152 CSE1 50V.100UF

X 6

MM

X 6

L

MM

L

(PS280)

.C3151 CSE1 50V, 100UF
.C3152 CSE1 50V. 100UF

(PS280)

.D111 Diode 1N5402,

Diode 1N4004,

.0311 Diode 1N5402,

.0404 Diode 1N5402,
.JP59 JUMP WIRE
.JP60 JUMP WIRE

.J113 WIRE

V J1072 WIRE C. JD-0104-0014

.J4042 WIRE

.J5011 WIRE
.RL501 RELAY DC24V,
.RL502 RELAY DC24V,
.RL503 RELAY DC24V,

WASHER.FLAT.0.312 ID X 0.469

NUXPLAIN.HEX.0.281-32 X 0.375

CURRENT/VOLTAGE KNOB
SCREW.MACHINE.M3 X 0.5
SCREW.PNH.THREAD FORMING
FRONT PANEL CONTROL CIRCUIT BOARD

.C501 CSC 5OV 22UF

.C502 CSC 50V, 1000PF
.0503 CSC 50V,
.C504 CSM 50V.
.C505 CSC 50V,

0112 LED RED. LT6411G, 6*6M/M, LEDTECH
.D113 LED GREEN
.D312 LED RED,
.D313 LED GREEN
.D403 LED RED,

D501 Diode 1N4148, TOSH.HT

.0502 Diode 1N4148, TOSH.HT
.D503 Diode 1N4148, TOSH.HT
.D504 Diode 1N4148, TOSH.HT
.0505 Diode 1N4148, TOSH.HT

0506 Diode 1N4148. TOSH.HT

(PS280)

Diode 1N4004,

C.

0.
C.

(END ATTACHING PARTS)

(ATTACHING PARTS)

G.I.

G.I.
G.I.
G.I.
G.I.

0.6

0.6

JD-0104-0016

JD-0104-0015
JD-0105-5338

10A
10A
10A

X 6

0.01

UF

0.22UF

0.1

UF

LT6421,

6*6M/M, LEDTECH

LT6411

G.6*6M/M,

LT6421,

6*6M/M, LEDTECH

LT6411

G.6-6M/M.

OD X 0.031

MM

L

LEDTECH

LEDTECH

Mfr. Part No.

200-3999-00
367-0441-00
211-0452-00
211-0428-00
213-0717-00
118-8707-00

118-8749-00

2241-25107Z0
2241-5010720
2241-5010720

2241-5010720
2241-5010720

2501-N540200
2501-N400400

2501-N540200
2501-N400400
2501-N540200

4270-06D0000
4270-0600000

40WCJ1040016
40WCJ1040014
40WCJ1040015
40WCJ1055338
3312-2410140
3312-2410140

3312-2410140

210-1025-00
210-0577-00
366-2172-00
211-0452-00
213-0119-00
118-8708-00

2201-5022620
2201-5010220
2201-5010320
2221-50224J0
2201-5010420

3110-12D2060
3110-1502070
3110-1202060
3110-1502070
3110-1202060
2502-N4148T0
2502-N4148T0

2502-N4148T0
2502-N4148T0
2502-N4148T0
2502-N4148T0

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Parts List

Index Tektronix
No.

Part No.

311-2404-00
311-2493-00

Serial/Assembly No.
Effective Dscont

Qty. Name

-Q501

v

& Description

Diode 1N4148.TOSH.HT
Diode 1N4148.TOSH.HT
Diode 1N4148.TOSH.HT

Zener VsW, 14.5V, HZ15-2, HITACHI
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6

WAFER B8B-XH-A
WAFER BOB-XH-A
WAFER B2B-XH-A
WAFER B5B-XH-A
TR 2SC 1815GR. TOSH
TR 2SA 1015GR, TOSH
TR2SC1815GR,'TOSH
RC%W. 47RJ. HT
RC6W. 47RJ, HT
RC%W, 22MJ, HT
RC'AW, 20KJ. HT
RC%W, 20KJ, HT
RC%W, 20KJ. HT

RCVHW,

20KJ,

HT

RC%W,82KJ.

HT
RCAW, 12KJ. HT
RCV.W. 4.7KJ. HT
RCy.W. 82KJ. HT
RC'AW. 33KJ. HT
RC'AW. 100RJ, HT
RC/.W, 30KJ. HT
RCy.W. 2.2MJ. HT
RC'/iW, 220KJ, HT
RC'AW, 10KJ, HT

RC'AW, 20KJ. HT
RM'AW. 30.1KF, HT
SW PUSH. SPUE22AE30
IC NE555R TEXAS
IC MC4N33. MOTO, (4N33, TFK)
(4N33.

GE)

VR10KB, 16A. RK163111R691

(RKDA10R691)

VR. 1KB. 16A, RK163111R717

(RK16110R19D)

Code Mfr. Part No.

2502-N4148T0
2502-N4148T0
2502-N4148T0
2503-1500051
4270-0600000
4270-O6D00O0

4270-0600000
4270-0600000
4270-06D0000
4270-0600000
4270-06DOOOO
4270-06D0000
4270-0600000
4270-0600000
4270-0600000
4270-0600000
4270-0600000
4270-06D0000
4270-06D0000
4270-0600000
4270-0600000
4270-0600000
4270-0600000
40WA-B8BXHA0
40WA-B9BXHA0
40WA-B2BXHA0
40WA-B5BXHA0

2602-1815GR0
2600-1015GR0
2602-1815GR0
2002-47B0JT0
2002-47B0JT0
2002-22B6JT0
2002-20B3JT0
2002-20B3JTO
2002-20B3JT0
2002-20B3JTO
2002-82B3JT0

2002-12B3JT0

2002-47B2JT0
2002-82B3JT0
2002-33B3JT0
2002-10B1JT0
2002-30B3JT0
2002-22B5JT0
2002-22B4JT0
2002-10B3JT0
2002-20B3JT0
2012-3012FT0
3202-1240610
2711-555P-00
2703-4N33-00

2110-103BC04
2110-102BC06

REV

AUG

1991

Parts Ust

Parts List

Index Tektronix
No.

Part No.

311-2404-00

311-2493-00

260-2567-00
118-8711-00

118-8747-00

Serial/Assembly No.
Effective Dscont

Qty. Name & Description

.VR304 VR10KB, 16A, RK163111R691
.VR305 VR, 1 KB,
.VR501 SVR 10-M, 2KB, H, ± 100PM

1 S101 POWER SWITCH.4A.250 VAC

1 DISPLAY CIRCUIT BOARDS ASSEMBLY
1 DISPLAY CIRCUIT BOARDS ASSEMBLY

.C201 CSD 630V,
.C202 CSD 100V,
.C203 CSN 50V, 100PJ

.C204 CSD 100V.
.C205 CSK100V.0.47UJ
.C206 CSE1 16V.1000UZ

.C207 CSE1 16V.100U2
.C601 CSD 630V, 0.01 UJ

C602 CSD 100V, 0.1UJ
.C603 CSN 50V, 100PJ
.C6O4 CSD 100V.
.C605 CSK 100V,
.C606 CSE1 16V, 1000UZ
.C607 CSE1 16V, 100UZ
.0201 Diode 1N4004, G.I. HT
.0202 Diode 1N4004, G.I. HT
.0203 Diode 1N4004, G.I. HT

.D204 Diode 1N4004, G.I. HT

0205 DISPLAY RED GAP

.0206 DISPLAY RED GAP LTS546A1-NB, 0.5"

(RKDA10R691)

(RK16110R19D)

(PS280)

(PS283)

16A, RK163111R717

(END ATTACHING PARTS)

(ATTACHING PARTS)

0.01

UJ

0.1

UJ

0.22UJ

0.11UJ

0.47UJ

LTS546A1

-NB,

0.5"

Code Mfr. Part No.

2110-103BC04
2110-102BC06

2100-202BMOO

3202-1120710

118-8711-00

118-8747-00

2271-6A103J0

2271-1A104J0
2211-50101JO
2271-1A224J0
2291-1A474J0
2241-16108Z0
2241-16107Z0
2271-6A103J0
2271-1A104J0
2211-50101JO
2271-1A224J0
2291-1A474J0
2241-16108Z0
2241-16107Z0
2501-N4004T0
2501-N4004T0
2501-N4004T0
2501-N4O04T0

3131-12A5020
3131-12A5020

0207 DISPLAY RED GAP LTS546A1-NB, 0.5"
0208 DISPLAY RED GAP LTS546A1-NB, 0.5"

.0601 Diode 1N4004, G.I. HT
.0602 Diode 1N4004, G.I. HT
.0603 Diode 1N4004, G.I. HT
.0604 Diode 1N4004. G.I. HT

0605 DISPLAY RED GAP

.0608 DISPLAY RED GAP LTS546A1-NB. 0.5"
.0607 DISPLAY RED GAP LTS546A1-NB, 0.5"
.0608 DISPLAY RED GAP LTS546A1-NB, 0.5"

150-0161-00
150-0161-00
150-0161-00

150-0161-00

.0609 LED RED GAR LT9511G. 5, LEDTECH

0610 LED RED GAR LT9511G, 5. LEDTECH

D611 LED RED GAP, LT9511G, 5, LEDTECH
0612 LED RED GAR LT9511G.5. LEDTECH
JP1 JUMP WIRE 0.6
JP2 JUMP WIRE 0.6

.JP3 JUMP WIRE 0.6
.JP4 JUMP WIRE 0.6

(PS283 ONLY)

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

LTS546A1

-NB.

0.5"

REV AUG

3131-12A5020
3131-12A5020

2501-N4004T0
2501-N4004T0
2501-N4O04T0
2501-N4004TO

3131-12A5020
3131-12A5020
3131-12A5020
3131-12A5020
3111-0200130

3111-0200130
3111-0200130

3111-0200130

4270-06DO0O0
4270-06DOOOO
4270-0600000
4270-0600000

1991

Parts List

Index Tektronix
No.

Part No.

Serial/Assembly No.
Effective Dscont

Qty. Name & Description

JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6

(PS283 ONLY)
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6

JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6

JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6 '

JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6
JUMP WIRE 0.6

(PS283 ONLY)

JUMP WIRE 0.6
WAFER B2B-XH-A
WAFER B2B-XH-A
WAFER B2B-XH-A
WAFER B2B-XH-A
RMV«W, 1KF, HT
RM'/iW, 1MF
RM'/«W. 267RF. HT
RM%W. 4.99KF, HT
RM%W. 267RF. HT
RC'AW, 47KJ, HT
RM'AW, 100KF, HT
RC/.W. 470RJ, HT
RC%W. 470RJ. HT
RM'AW. 27 KF, HT

(TEST SELECTED)
RM%W. 27
RM%W.

1KF,
RM'/aW, 1MF
RM%W. 267RF, HT

RM%W. 4.99KF, HT

KF.

HT

HT

Mfr. Part No.

4270-06DOOOO
4270-O6D0OO0
4270-06DOO0O
4270-0600000

4270-06DOOOO
4270-O6D0O0O
4270-O6DO0OO
4270-0600000
4270-06DOOOO
4270-06DOOOO
4270-0600000
4270-O6D00O0
4270-06D0000

4270-O6DOO0O
4270-O6D0O0O
4270-0600000
4270-O6D0OO0
4270-O6DO000
4270-0600000
4270-06DOOOO
4270-O6D0OO0
4270-0600000
4270-06DOOOO

4270-0600000
4270-O6D0000
4270-0600000
4270-0600000
4270-06DOOOO
4270-06DOOOO
4270-06DOOOO
4270-0600000
4270-0600000
4270-06DOOOO
4270-06D0000
4270-06DOOOO

4270-06DOOOO
40WA-B2BXHA0
40WA-B2BXHA0
40WA-B2BXHAO
40WA-B2BXHA0
2012-1001FTO
2013-1004FOO

2012-2670FT0
2012-4991FTO
2012-2670FT0

2002-47B3JTO
2012-1003FT0
2002-47B1JTO
2002-47B1JTO
2012-2702FT0

2012-2702FT0
2012-1001FTO
2013-1004F00
2012-2670FT0
2012-4991FTO

REV AUG

1991

Parts List

Parts List

Index Tektronix
No.

Part No.

260-2568-00
260-2568-00

156-1435-00

-15 213-0717-00

-16 211-0785-00

-17 211-0785-00

Serial/Assembly No.
Effective Dscont Qty. Name & Description

.R608 RM%W, 267RF, HT
.R609 RC'AW, 47KJ, HT
.R610 RM'/4W, 100KF. HT
.R611 RCV.W, 47ORJ, HT
.R612 RCV.W. 47ORJ, HT
.R613 RM'AW, 27 KF, HT

(TEST SELECTED)
.R614 RM'AW, 27 KF, HT
.R2011 RM'/aW.SOOKF
.R2012 RM%W, 500KF
.R6011 RM'/aW, 500KF
.R6012 RM'AW, 500KF
.S201 SW SILDE SSS342NB4-GW, O.1A

S202 SW SILDE SSS342NB4-GW, O.1A

.U201 IC ICL7107CPL (ICL7107SCPL).

INTERSIL (TSC7107CPL)

U202 IC UA431AWC, FAIR, NS

.U203 IC UA7805UC, FAIRCHILD (LM7805CT,

.U601 IC ICL7107CPL (ICL7107SCPL),
.U602 IC UA431AWC, FAIR, NS

.U6O3 IC UA7805UC, FAIRCHILD (LM7805CT,

.VR201 SVR 1O-M,
.VR202 SVR 1O-C, 1OKB, H

VR601 SVR 10-M,

.VR602 SVR 10-C, 10KB, H

.XU201 IS40RD, N

.XU203 HS HS-GSP-13A, MB-210
.XU601 IS40P, D, N
.XU603 HS HS-GSP-13A, MB-210

SCREW.4-20 X
SCREW.MACHINE.M3 X 6 MM

SCREW.MACHINE.M3 X 6 MM

NS) (AN7805 MATS)
INTERSIL (TSC7107CPL)

NS) (AN7805 MATS)

(PS280)
SVR 10-C, 470RB. H

SVR 10-C. 470RB. H

(END ATTACHING PARTS)

0.312.PNH.THREAD

2KB.

2KB,

± 1O0PPM

± 100PPM

FORMING

Mfr. Part No.

2012-2670FT0
2002-47B3JTO
2012-1003FT0

2002-47B1JTO
2002-47B1JT0
2012-2702FT0

2012-2702FT0
2013-5003F00
2013-5003F00
2013-5O03F0O
2013-5003F00

3204-0240170
3204-0240170
2712-7107CPL

2711 -431CPLZ
2701-7805UCZ

2712-7107CPL

2711-431
2701-7805UCZ

2100-202BM01
2100-103BC01

2100-471BC01

2100-202BM01
2100-103BC01

2100-471BC01
3612-40D000N

5207-AF000210
3612-40DOOON

2701-7805UCZ

213-0717-00
211-0785-00
211-0785-00

CPLZ

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Parts List

REV AUG

1991

Figure

8-1:

Exploded View A

Parts List

Parts List

Index Tektronix
No.

Part

8-2-1

-2 118-8709-00

-10 211-0498-00

-11 211-0728-00

No.

118-8706-00

118-8748-00

159-0339-00
159-0191-00

159-0338-00
159-0338-00
159-0339-00

159-0191-00

159-0338-00
159-0338-00
159-0339-00
159-0312-00
159-0312-00

129-1414-00

129-1412-00
211-0784-00
213-0717-00
118-8712-00

220-0085-00
118-8710-00

Serial/Assembly

Effective Dscont

No.

Qty.

Name & Description

FUSE CIRCUIT BOARD

(PS280)
FUSE CIRCUIT BOARD
(PS283)

(ATTACHING PARTS)

.F102 FUSE.5

.F102 FUSE.5

.F103 FUSE.5
.F104 FUSE.5

.F105 FUSE.5

.F105 FUSE.5X20MM.2A.250V
.F106 FUSE.5

.F107 FUSE.5
.F108 FUSE.5
.F109 FUSE.5
.F110 FUSE.5

J113 WIRE
.J313 WIRE
J1041 WAFER B2B-XH-A
.J1042 WAFER B2B-XH-A

AC SELECTOR CIRCUIT BOARD

.S102 SW SLIDE SDKGA4, F7422070M

.8103 SW SLIDE SDKGA4, F7422070M

SPACER.POST.32.5 MM
SPACER.POST.30 MM
SCREW.MACHINE.M3
SCREW.SELF TAPPING.4-20

TRANSISTOR CIRCUIT BOARD.SLAVE

.J1051 WAFER B4P-VH
.Q3071

TR 2N

.Q3072

TR

NUT.PLAIN.HEX.M3 X5.5

TRANSISTOR CIRCUIT BOARD.MASTER

J3051 WAFER B8P-VH
.Q402

TR

.Q1071

TR 2N

.01072

TR

SCREW.MACHINE.M3
SCREW.MACHINE.M3

X 20

MM.5A.250V

(PS280)

X 20

MM.2A.250V

(PS283)

X 20

MM.0.315A.250V

X 20

MM.0.315A.250V

X 20

MM.5A.250V

(PS280)

X 20

MM.0.315A.250V

X 20

MM.0.315A.250V

X 20

MM.5A.250V

X 20

MM.0.25A.250V

X 20

MM.0.25A.250V

C.

JD-0104-0016

C.

JD-0104-0016

(END ATTACHING PARTS)

(ATTACHING PARTS)

(SDKGA4274A)

(SDKGA4274A)
(END ATTACHING PARTS)

L
L
X 8 MM

(ATTACHING PARTS)

3055, TOSH

2N 3055. TOSH

(END ATTACHING PARTS)

(ATTACHING PARTS)

2N 3055, TOSH

3055. TOSH

2N 3055, TOSH

(END ATTACHING PARTS)

(2N
(2N

MM

(2N
(2N
(2N

X 12 MM
X 0.5 X 16 MM

X 0.312

3055,
3055,

3055.
3055,
3055,

ST)
ST)

ST)
ST)
ST)

Mfr.

Part

No.

118-8706-00
118-8748-00

37FT-1124502
37FT-1124502
37FT-1124311

37FT-1124311

37FT-1124502
37FT-1124502
37FT-1124311

37FT-1124311

37FT-1124311
37FT-1124251
37FT-1124251
40WCJ1040016
40WCJ1040016
40WA-B2BXHA0
40WA-B2BXHA0

118-8709-00

3204-0220180

3204-0220180

129-1414-00

129-1412-00
211-0784-00
213-0717-00
118-8712-00

40WA-B4PVH00
2610-3055-00
2610-3055-00

220-0085-00
118-8710-00

40WA-B8PVH00
2610-3055-00
2610-3055-00
2610-3055-00

211-0498-00
211-0728-00

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

8-9

Parts List

Index Tektronix
No.

Part No.

-12 118-8705-00
118-8746-00

Serial/Assembly No.
Effective Dscont

Qty. Name & Description

MASTER CIRCUIT BOARD
(PS280)

MASTER CIRCUIT BOARD

(PS283)

(ATTACHING PARTS)

.C102 CSE1 4700UF.63V

.C109 CSE1 25V, 47UZ, 8@
.C110 CSD 630V.

.C111 CSD 100V. 0.1UJ, 13*9*4
.C112 CSC50V, 500PJ
.0113 CSN 50V, 33PJ. 6@

.C302 CSE1 4700UR63V

.C309 CSE1 25V, 47UZ, 8@
.C310 CSD 630V,
.C311 CSD 100V.0.1UJ. 13*9*4
.0312 CSC 50V, 500PJ
.0313 CSN 50V.33PJ, 6@
.0403 CSC 50V, 1000PK
.C404 CSC50V, 1000PK
.01141 CSE1 50V,
.01142 CSE1 50V. 4.7UZ
.C3141 CSE1 50V, 4.7UZ

. .03142 CSE1 50V. 4.7UZ

.DL1 Wire C.
.DL2 Wire C. JD-2101-2564

0103 Zener %W.

.D104 Zener %W.11.9V-12.4V, HZ12A2.

.D105 Diode 1N4148, TOSHfTFK, PHIL, FAIR),HT

010B Zener V2W,

0107 Diode 1N4148, TOSHfTFK, PHIL, FAIRJ.HT
.D108 Diode 1N4148, TOSHfTFK, PHIL, FAIRJ.HT
.0109 Zener %W,

.0110 Diode 1N5402. G.I.
.D116 Diode 1N4148, TOSHCTFK, PHIL, FAIRJ.HT
.D303 Zener %W.

.D304 Zener '/2W,11.9V-12.4V, HZ12A2,

.D305 Diode 1N4148, TOSHfTFK. PHIL. FAIR),HT
.0306 Zener VaW,

0307 Diode 1N4148. TOSHfTFK, PHIL. FAIR).HT
.D308 Diode 1N4148. TOSHCTFK, PHIL. FAIR),HT
.D309 Zener'/aW,

.0310 Diode 1N5402, G.I.

.0316 Diode 1N4148, TOSH
.0402 Diode 1N4148. TOSH
.JP1 JUMP WIRE 0.6

(PS280)

CSE1 2200UF.63V

0.01 UJ,

(PS280)

CSE1 2200UF.63V

0.01 UJ.

4.7U2

JD-2101

5.0V-5.2V,

Hitachi Only

Hitachi Only

8.89V-9.29V,

NEC Only

8.89V-9.29V,

NEC Only

5.0V-5.2V.

Hitachi Only

Hitachi Only

8.89V-9.29V.

NEC Only

8.89V-9.29V.

NEC Only

13*4*9

13*4*9

-2564

HZ5C2.

RD9.1

RD9.1

HZ5C2.

RD9.1

RD9.1EB3.

EB3.

EB3.

EB3,

Mfr. Part No.
118-8705-00

118-8746-00

2241-63478Z0
2241-63228Z0
2241-25476Z0

2271-6A103J0
2271-1A104J0
2201-50501JO
2211-50330J0

2241-63478Z0
2241-63228Z0
2241-25476Z0

2271-6A103J0
2271-1A104J0
2201-50501 JO
2211-50330J0

2201-50102K0
2201-50102K0

2241-50475ZO

2241-50475Z0
2241-50475Z0
2241-5O475Z0
40WCJ7012564
40WCJ7012564

2503-0510050

2503-1200050
2502-N4148T0

2503-0910050
2502-N148T0

2502-N148T0
2503-0910050

2501-N540200
2502-N4148T0
2503-0510050

2503-1200050

2502-N4148T0
2503-0910050

2502-N4148T0
2502-N4148T0
2503-0910050

2501-N540200
2502-N4148T0
2502-N4148T0
4270-06D0000

REV AUG

1991

Parts Ust

Parts List

Index Tektronix
No.

Part No.

Serial/Assembly No.
Effective Dscont

Qty. Name & Description

JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE

JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE

WAFER B2P-VH
WAFER JD-PI-5002
WAFER B2P-VH
WAFER JD-PI-5002
WAFER B2P-VH
WAFER B3P-VH
WAFER B8P-VH
WAFER B4P-VH
WAFER B4B-XH-A
WIRE

C.JD-0110-0017
WAFER B6P-VH
WAFER B4P-VH
WIRE

C.

JD-0111-0001
WAFER B4B-XH-A
TR 2SC 1815GR, TOSH
TR 2SD 880Y, TOSH
TR 2SC 1815GR, TOSH

TR 2SA 1015GR, TOSH
TR 2SC 1815GR. TOSH
TR 2SD 880Y TOSH
TR 2SC 1815GR, TOSH
TR 2SA 1015GR, TOSH
TR 2SD 880Y TOSH

RM%W.

2KF.
RM'AW. 10K,
RC'/iW, 150KJ.
RC%W. 68RJ,
RCV,W,

1.5KJ,
RCV«W, 1KJ.
RC'/,W,

1.5KJ,
RC'AW, 13KF,
RM'/iW,

30.1 KF,

RCVHW,

4.7MJ, HT

RC'/iW. 10MJ.HT

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

0.6

HT

HT

HT

HT

HT

HT

HT

HT

HT

Mfr. Part No.

4270-O6D00O0
4270-06D0000
4270-06D0000
4270-0600000
4270-0600000
4270-06D0000
4270-0600000

4270-06D0000

4270-06DOOOO
4270-06D0000
4270-06DOOOO

4270-0600000
4270-0600000

4270-06D0000
4270-0600000
4270-0600000
4270-0600000
4270-0600000

4270-0600000
4270-O6D00O0

4270-06DOOOO

4270-0600000
4270-0600000

40WA-B2PVH00
40WAJ500P020
40WA-B2PVH00
40WAJ500P020
40WA-B2PVH0O
40WA-B3PVH00
40WA-B8PVH00
40WA-B4PVH00
40WA-B4BXHA0
40WCJ1100017
40WA-B6PVH00
40WA-B4PVH00
40WCJ1110001
40WA-B4BXHA0
2602-1815GR0

2603-880Y-00

2602-1815GR0

2600-1015GR0
2602-1815GR0
2603-880Y-00
2602-1815GR0
2600-1015GR0
2603-880Y-00
2012-2001FTO
2012-1002FTO
2002-15B4JT0
2002-68BOJTO
2002-15B2JT0
2002-10B2JT0
2002-15B2JT0
2012-1302FTO
2012-3012FT0
2002-47B5JT0
2002-10B6JT0

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Parts List

Index Tektronix
No.

Part

No.

Serial/Assembly
Effective Dscont

No.

Qty.

Name & Description

RC'AW,
RC'AW,
RC'AW,
RC'AW,
RC'AW,

JUMP WIRE

RC'AW,
RO
RC'AW.

RC'AW,
RR2W.150RJ
RM%W.
RMV«W,
RC'AW,
RC'AW,
RC'AW.
RC'AW,
RC'AW,
RM'AW,
RM'AW,
RC'AW,
RC'AW,
RC'AW,
RC'AW.
RC'AW.
RC'AW.
RC'AW.

JUMP WIRE

RC'AW.
R0
RC'AW.

RC'AW,
RC'AW,

RR 2W,

RC'AW,
RC'AW.
RC'AW.
RC'AW.
RC'AW.
RR5W,
RC'AW.
RC'AW,
RC'AW,
RC'AW,
RC'AW,
RC'AW.
RR5W,

(PS280)
RR5W.

(PS283)
RC'AW,
RC'AW.
RC'AW,
RC'AW,
RC'AW,
RC'AW.

RC'AW,

2W,

2W.

2.7KJ. HT

1KJ, HT
180RJ, HT
1OKJ. HT
51

ORJ.

0.6@, HT
51ORJ, HT
1KJ

3.3KJ, HT
150KJ, HT

2KF,

HT

10KF. HT
150KJ. HT
68RJ, HT

1.5KJ,

HT

1KJ. HT

1.5KJ,

HT
13KF, HT
3O.1KF, HT

4.7MJ, HT
10MJ. HT

2.7KJ, HT
1KJ, HT
180RJ. HT
19KJ. HT
51

ORJ,

0.6@, HT

51

ORJ,

1KJ

3.3KJ. HT
150KJ, HT

4.7MJ, HT

150RJ

3.6KJ. HT
3KJ. HT

1.2KJ.

HT

2.7KJ, HT
1KJ, HT

0.3RJ.

+100PPM
19KJ. HT
19KJ. HT

1.2KJ,

HT

1.5KJ.HT

2.4KJ, HT

2.4KJ, HT

0.3RJ,

±100PPM

0.5RJ,

+100PPM

1KJ. HT
1KJ, HT
47RJ. HT
47RJ, HT

4.7KJ, HT

4.7KJ, HT

4.7KJ, HT

HT

HT

HT

Mfr.

Part

No.

2002-27B2JT0
2002-10B2JT0
2002-18B1JY0
2002-10B3JT0
2002-51B1JT0
4270-06D0000
2002-51B1JT0
2075-10B2J00
2002-33B2JT0
2002-15B4JT0
2035-1500JOO
2012-2001FTO
2012-1002FT0
2002-15B4JT0
2002-68B0JT0
2002-15B2JT0

2002-10B2JT0
2002-15B2JT0
2012-1302FT0
2012-3012FT0
2002-47B5JTO
2002-10B6JT0
2002-27B2JTO
2002-10B2JT0
2002-18B1JT0
2002-10B3JT0
2002-51B1JT0
4270-O6D0000
2002-51B1JT0
2075-10B2JO0
2002-33B2JT0
2002-15B4JT0
2002-47B5JT0
2035-1500J00
2002-36B2JT0
2002-30B2JT0
2002-12B2JT0
2002-27B2JT0
2002-10B2JT0
2037-3BBDJ00
2002-10B3JT0
2002-10B3JT0
2002-12B2JT0
2002-15B2JT0
2002-24B2JT0
2002-24B2JT0
2037-3BBDJ00

2037-5BBDJ00
2002-10B2JT0

2002-10B2JT0
2002-47B0JT0
2002-47BOJTO
2O02-47B2JT0
2002-47B2JT0
2002-47B2JT0

REV AUG

1991

Parts

Ust

Parts Ust

Index Tektronix
No.

Part No.

Serial/Assembly No.
Effective Dscont

Qty. Name & Description

RC'AW, 4.7KJ, HT
RC/.W, 2.4KJ, HT

RC'AW, 2.4KJ, HT
RC'/.W, 1KJ. HT
RC%W,

1KJ.
RC'AW, 47RJ, HT
RCV«W, 47RJ, HT

RC%W, 4.7KJ, HT
RC'/«W, 4.7KJ, HT
RC'/dW, 4.7KJ, HT
RC%W, 4.7KJ, HT
RR5W, 0.3RJ, +100PPM

(PS280)
RR5W. 0.5RJ, +100PPM

IC UA431AWC, FAIR, NS

IC UA741CR TEXAS (UA741TC. FAIR)
IC LM301AR TEXAS
IC UA741CR TEXAS (UA741TC, FAIR)
IC UA431AWC. FAIR, NS
IC UA741CR TEXAS (UA741TC, FAIR)
IC LM301AR TEXAS
IC UA741CR TEXAS (UA741TC, FAIR)
IC UA723CN, TEXAS (SIGNETICS)
IC UA741CR TEXAS (UA741TC, FAIR)

HT

Code Mfr. Part No.

2002-47B2JT0
2002-24B2JT0

2002-24B2JT0
2002-10B2JT0
2002-10B2JT0
2002-47B0JT0

. 2002-47B0JT0

2002-47B2JT0
2002-47B2JT0
2002-47B2JT0
2O02-47B2JT0
2037-3BBDJO0

2037-5BBDJOO

2711-431CLPZ

2711-741CP-0
2711-301AP-0
2711-741CP-0
2711-431CLPZ
2711-741CP-0
2711-301AP-0
2711-301AP-0
2711-723CN-0
2711-301 AP-0

-13 211-0428-00

-14 213-1037-00

-15 210-0011-00

-16 200-3998-00

-17 120-5007-00

120-5006-00

-18 211-0751-00

-19 118-8704-00
118-8750-00

SVR 10-M, 2KB. H. ± 100PM
SVR 10-C, 2.2KB, H
SVR 10-C, 3.3KB, H
SVR 10-M, 2KB. H, ± 100PM
SVR 10-C, 2.2KB, H
SVR 10-C, 3.3KB, H
SVR 10-C, 22KB, H
SVR 10-C, 1KB. H
SVR 10-C. 1KB, H
SVR 10-C, 1KB. H
SVR 10-C. 10KB. H

(END ATTACHING PARTS)
2 SCREW.ASSEM WSHR.M3 X 0.5 X 6 MM L
4 SCREW.MACHINE.M5X12
4 WASHER.LOCK.0.25 ID.0.025 THK
1 COVER.BOTTOM

RANSFCRMER

TS101 TRANSFORMER

(PS283)

2 SCREW.ASSEMWSHR.M3X8

SLAVE CIRCUIT BOARD
(PS280)

SLAVE CIRCUIT BOARD

(PS283)

(ATTACHING PARTS)
CSE1 35V, 470UZ
CSE1 35V, 470UZ

CSE1 25V, 100UZ
CSE1 25V, 1O0UZ

CSM

50V,

0.01 UJ

2100-202BM00
2100-222BC01
2100-332BCOO
2100-202BM00
2100-222BC01
2100-332BCO0
2100-223BCO0
2100-102BCOO
2100-102BCOO
2100-102BCOO

2100-103BC01

211-0428-00
213-1037-00
211-0011-00
200-3998-00

120-5007-00
120-5006-00
211-0751-00

118-8704-00
118-8750-00

2241-35477Z0
2241-35477Z0

2241-25107Z0
2241-25107Z0
2221-50103J0

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Parts List

Index Tektronix
No.

Part

No.

Serial/Assembly
Effective Dscont

No.

Qty. Name & Description

CSM 50V.0.01UJ
(PS280 ONLY)

CSE1 35V, 470UZ
CSE1 35V. 470UZ
CSE1 25V, 100UZ
CSE1 25V, 100UZ
CSM 50V.0.01UJ
CSM 50V.0.01UJ

(PS280 ONLY)
CSE1 25V, 6800UZ
Diode 1N4148, TOSH.
Diode 1N4148, TOSH,
Diode 1N4148, TOSH,

Diode 1N5402,

Diode 1N5402,
Diode 1N5402,
Diode 1N5402,
Diode 1N4004, G.I.
Diode 1N4004, G.I.
Diode 1N4004. G.I.
Diode 1N4004. G.I.
DIODE 1N5402,
DIODE 1N5402.
DIODE 1N5402,
DIODE 1N5402,
DIODE 1N5402,
DIODE 1N5402,
DIODE 1N5402,

DIODE 1N5402
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE

JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE
JUMP WIRE

WAFER JD-PI-5004
WAFER JD-PI-5004
WAFER B2P-VH
WAFER B6P-VH
WAFER B12B-XH-A
TR2SA 1015GR, TOSH
TR2SA715C, HITACHI
TR 2SC 1815GR, TOSH

(PS280 ONLY)

TR2SC1815GR.TOSH

(PS280 ONLY)

G.I.
G.I.
G.I.
G.I.

G.I.
G.I.
G.I.
G.I.
G. I.
G. I.
G. I.

;

HT
HT
HT
HT

HT
HT
HT

Mfr. Part

2221-50103J0
2241-35477Z0

2241-35477Z0
2241-25107Z0
2241-25107Z0
2221-50103J0
2221-50103J0

2241-25688Z0
2502-N4148T0
2502-N4148T0
2502-N4148T0

2501-N540200

No.

2501-N540200

2501-N540200
2501-N540200
2501-N4004TO
2501-N4004T0
2501-N4004T0

2501-N4004TO

2501-N540200

2501-N540200
2501-N540200
2501-N540200

2501-N54D200
2501-N54D200
2501-N54D200
2501-N54D200
427O-O6D00O0

4270-06D0000
4270-06DOOOO
4270-06DOOOO
427O-O6DO0O0
4270-O6DO0O0

4270-06D0000

427O-06DOOO0
427O-06DO000
427O-O6D0O00
4270-0800000
4270-O6DO000
4270-06DOOOO
4270-06D0000
4270-06DOOOO
4270-06D0000

4270-06D0000

40WAJ500P040
40WAJ500P040

40WA-B2PVH00
40WA-B6PVH0O

40WAB1BXHAO

2600-1015GR0
2600-715C-00
2602-1815GR0

2602-1815GR0

REV AUG

1991

Parts List

Parts List

Index Tektronix

No.

Part No.

148-0251-00

148-0251-00
148-0251-00

148-0251-00

-20 211-0751-00

159-0233-00

159-0226-00

Serial/Assembly No.
Effective Dscont Qty. Name & Description

.0110 TR2SA1015GR.TOSH

.0111 TR2SC1815GR.TOSH
.Q112 TR 2SC 1815GR, TOSH
.0301 TR 2SA 1015GR, TOSH
.0302 TR 2SA715C, TOSH

.0308 TR 2SC 1815GR, TOSH
.0309 TR 2SC 1815GR, TOSH
.0310 TR 2SA 1015GR, TOSH

.0311 TR 2SC 1815GR, TOSH
.0312 TR 2SC 1B15GR. TOSH
.RL101 RELAY DC24V, 10A

.RL102 RELAY DC24V, 10A
.RL301 RELAY DC24V. 10A

.RL302 RELAY DC24V. 10A
.R102 RC'AW, 10KJ, HT
.R103 RM'AW. 11.3KF, HT
.R104 RM'AW, 10.5KF, HT
.R133 RC'AW. 4.7KJ, HT
.R134 RC'AW, 15KJ. HT

.R135 RC'AW, 10KJ, HT
.R136 RC'AW, 4.7KJ, HT
.R137 RC'AW, 27KJ. HT
.R138 RC'AW, 15RJ, HT
.R139 RC'AW.ISKJ.HT
.R140 RC'AW. 15RJ, HT
.R141 RC'AW. 30KJ, HT
.R142 RC'AW.
.R301
.R302 RC'AW, 10KJ, HT
.R303 RM'AW, 11.3KF, HT

.R304 RM'AW, 10.5KF, HT
.R333 RC'AW. 4.7KJ, HT
.R334 RC'AW, 15KJ, HT
.R335 RC'AW, 19KJ, HT
.R336 RC'AW. 4.7KJ, HT
.R337 RC'AW, 27KJ, HT
.R338 RC'AW, 15RJ, HT

R339 RC'AW, 15KJ, HT

.R340 RC'AW, 15RJ, HT
.R341 RC'AW. 30KJ, HT
.R342 RC'AW,
.R401 RC 1W, 470RJ

U101 IC UA7815UC, FAIR (AN7815, MATS)

U301 IC UA7815UC, FAIR (AN7815, MATS)

3 SCREW.ASSEM WSHR.M3 X 8

1 F101 FUSE, 4A.250V.FAST

1 F101 FUSE. 2.5A.250V.FAST

(PS280 ONLY)

(PS280 ONLY)
(PS280 ONLY)

(PS280 ONLY)

(PS280 ONLY)

(PS280 ONLY)

9.1 KJ,

RO

3W,

4.7KJ

9.1 KJ,

(L7815CV ST)

(L7815CVST)
(END ATTACHING PARTS)

POWER SOCKET RECEPTACLE

(PS280)

(PS283)

HT

HT

Mfr. Part No.

2600-1015GRO
2602-1815GR0

2602-1815GR0
260O-1015GR0
2600-715C-00

2602-1815GR0
2602-1815GR0
2600-1015GR0
2602-1815GR0

2602-1815GR0
3312-2410140

3312-2410140
3312-2410140

3312-2410140
2002-10B3JT0
2012-1132FT0
2012-1052FT0
2002-47B2JT0
2002-15B3JT0
2002-10B3JT0
2002-47B2JT0
2002-27B3JT0
2002-15B0JT0
2002-15B3JT0
2002-15BOJT0
2002-30B3JT0
2002-91B2JT0
2076-47B2J00

2002-10B3JT0
2012-1132FT0
2012-1052FT0
2002-47B2JT0
2002-15B3JT0
2002-10B3JT0
2002-47B2JT0
2002-27B3JT0
2002-15B0JT0
2002-15B3JT0
2002-15B0JT0
2002-30B3JT0
2002-91B2JT0
2004-47B1J00
2701-7815UCZ

2701-7815UCZ

211-0751-00

3610-0060030

159-0233-00

159-0226-00

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

REV AUG

1991

Parts List

REV AUG

1991

Figure 8-2: Exploded View B

Parts List

Parts List

Index Tektronix
No.

Part No.

070-8355-00

161-0248-00
196-3201-00

070-8356-00
161-0104-06

161-0104-07

161-0104-05
161-0104-08

161-0167-00

Serial/Assembly No.
Effective Dscont

Qty. Name & Description

Standard Accessories
1 PS280 & PS283 Operators Manual
1 Power Cord, Option AO.North American,

120 V/6 A.60HZ
1 Test Lead, Set of 3 Pairs

Optional Accessories

PS280 & PS283 Service Manual

Power Cord, Option

220 V/6 A.SOHz
Power Cord, Option A2,United Kingdom,
240 V/6 A,50Hz
Power Cord, Option A3,Australian, 120 V/6 A,50Hz
Power Cord, Option A4,North American,
220 V10 A.60HZ
Power Cord, Option A5,Switzerland, 240 V6 A.SOHz

A1

.Universal European,

Mfr. Part No.

070-8355-00
161-0248-00

196-3201-00

070-8356-00
161-0104-06

161-0104-07
161-0104-05

161-0104-08
161-0167-00

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

BBiimmnnnri Diagrams

w

fSJDiagrams

and Circuit Board Illustrations

This section contains the circuit board illustrations and schematic diagrams
this power supply.

Component Values Electrical components shown on the diagrams are in the following units unless

noted otherwise:
Capacitors: Values one

one are in microfarads

Resistors: Values are

or

greater are in picofarads (pF). Values less than

(JJ.F).

in

Ohms (Q).

for

PS280

& PS283 Laboratory DC Power Supply

Module-Level

Service Manual

9-7

JP03

o

1

I

C112

Hf

QP

s

0304

J4041

t

I

I

I VR403

s

)

PS280 & PS283 Laboratory

DC

Power Supply Module-Level Service Manual

Figure

9-1:

Master Circuit Board

s %

Figure 9-2: Slave Circuit Board

PS280 & PS283 Laboratory

DC

Power Supply Module-Level Service Manual

o

o

Decs

I

D6°7

O2.5

JP37

j

7p3

P38

5

o

o

J2022

J2042

J2092

J2112

J2102

|

J2122

o

;l

SiSlSlSlgT

J2021

l}l{

J2041

J207 J205

1

u

il

g

IT

S

Figure 9-3: Display Assembly Circuit Boards

J2091

J2111

J2101

J2121

i

g

s

s

PS280 & PS283 Laboratory

DC

Power Supply Module-Level Service Manual

o

O O QO

\ /

C3251-2

8

Figure 9-4: Output Connectors Circuit Board

s

ft

•f-

s s s

o

T

o

1

s

2

I

rv\

o o

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

A

r~r^\

U

- U

Figure 9-5: Front Panel Controls Circuit Board

ll

r^\

/

J1082

4Sh-

/

// \

o o

o

O Q3072

o

o

o

J1041

J1042

:

F110

°

no.

0

o

s

o

o

o

o

c

o

o

o

o

o

o

Master

o

P109

P103

P104

J1022 J3022

F102

P105

P107

Pica

J113

J313

o

J3021

o

Figure 9-6: Power Transistors Circuit Boards

PS280 & PS283 Laboratory DC Power Supply Module-Level Service Manual

Figure 9-7: Fuse Circuit Board

Figure 9-8: AC Selector Circuit Board

A

2

DVM

P101

a

( TO

JiDi

5

B

JSOO

IS

PART

O

O O S1D3

n?i

6

O O

sia-a

LIN^VOLTASE

SIDE

BOARD

%f%

u

c

J

HUJdd

P

31

GL".

jp

P1033

TO J1O23
512-2 BOARD

TO J3OS3
512-2 BOARD

512-2 BOARD

D

REV AUG 1331

FROM PI13

512-2 BOARD t~

JX

^1

ft

FROM P313

512-2 BOARD ^J

r

AC INPUT. TRANSFORMER

GPC-577 BOARD

TD J1043
PM-515 BOARD

TO J1044

2 , PM-515 BOARD

w REFERENCE DESIGNATORS

&

FUSE BOARD

PARENTHESES ARE SILK SCREENED
ON THE BOARD.

IN

P1D1 FROM
MAIN POWER
TRANSFORMER

A

FROM P1023

B

TO FUSE F102

o

GPC-512-1

P3O1 FROM
MAIN POWER
TRANSFORMER

FROM P3O23

D

FROM J1D33 -1

GPC-512-1

I I BPC-S1S-1

REV AUG 133i

MAIN/AUXILIAF:Y RECTIFIER S FILTER

A

B

lAf%

D

REV AUS 1991

TO J1DB1

VOLTAGE/CURRENT CONTROL S TRACKING CONTROL

A

FROM JSO1H

(RL5O3) *

3i!

(JPSO)

» (RL5O2) x

WSO

KSOS

If3"!

B

FROM P1Q71

FROM PHOS
PM-S15 [20]

FROM PSO7
PM-51S [EDI

FROM J-4O2 v_i I +F

[5C] <^ y2_

(RLSDi) *

^.

iioli

V

u

r

T '#

1

^x

1

^^

1

_2_,

SV FIXED 3A

1 , FROM JiDB

a , [EA] <§>

1 ( FROM J3DB

[BA] <B>

D

REV AUG LSSi

TO P4041

512-5 BOARD

NOTE:

H REFERENCE DESIGNATORS IN

PARENTHESES ARE SILK SCREENED
ON THE BOARD.

OUTPUTS MASTER. SLAVE S 5 VOLT 3 AMP

^>

&r%

NOTE: « REFERENCE DESIGNATORS IN

i

REV AUG 1331

PARENTHESES ARE SILK SCREENED
ON THE BOARD.

PARTIA._ 512-1 BO

MASTER VOLTAGE/CURRENT

FROM JliOl

A

B

D

REV AUB 1SS1

SLAVE VOLTAGE/CURRENT

A

FROM JliDl x A

mm

<|> ^a

5

B

FROM J4O42-1

FROM J4O42-2

g^T^Eo

^ -

I

r

PARTIAL

512-S

BO

+5 VOLT FIXED

m:

(0206)

(0208)

*

/LSOIO

/LED11

13

Tg

/LEO1G

10

*

A

B

(VRSO1]

R201

*

RHDS

1

(UNITS)

(MINUS)

10

LE010/

1-4

LE012/

It

2O

LED22/

1

U2112

J

f-J

LED

(O.

.S31

(JPO4)

IS

r

(JP1O4)

(JP1OS)

«

*

7=r

M

TT

(0B03)

mis—Q\

T?

*t

D

FROM

J113

VOLTAGE
ACCURACY

BP/GND

u

PM-S15 PARTIAL CONTROL BOARD

PM-513 PARTIAL DISPLAY BOARD

#

CURRENT
ACCRURACY

FROM

J10B1

REV

AUE 1331

REFERENCE DESIGNATORS
PARENTHESES
ON

THE

ARE

BOARD.

MASTER DIGITAL METER

IN

SILK SCREENED