Systron Donner TL8-3 Service manual

INSTRUCTION

ON
STABILIZED
TRIPLE POWER SUPPLY

MANUAL

TLS-3

SERIES

SVSTRON

DONNER

G M B H

INSTRUCTION MANUAL

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Note:

Address:

AC

MODEL

STABILIZED TRIPLE POWER

In

case

the

SYSTRON DONNER GMBH, 8 Munchen 60, BodenseestraBe
Telephone:

TL8-3

of

model and serial-No.

EG

and

technical questions

(0811)

87110

TL8-3

of

the

21

EG

OV

SUPPLY

or

spare part requests please specify

power

supply.

113

WARRANTY.

SYSTRON-DONNER

instruments

are

warranted during a period of
date of shipment to the original purchaser to
material
except as they are warranted
SYSTRON-DONNER
any
his expense during the
to mis-use,
accident.
to the existance
DONNER

This warranty
statutory,

upon

authorised

Every

working
as

soon

operate, a claim should immediately

and

workmanship.

under

instrument or

neglect,

this

component

improper

SYSTRON-DONNER

and

cause

be

liable

and

SYSTRON-DONNER

officer

SYSTRON-DONNER

order
as

it

for

collateral

is

in

lieu

no

agreement extending or modifying

unless

of

instrument

at

the time

is

received.

This warranty does not apply to

by

the tube manufacturer.

warranty

thereof

one

year period

is

limited to replacing or repairing

which

and

is

which

installations,

shall

of

of

it

the

company.

RECEIVING

of

have

the defect.

or

consequential

any

other

is

made

is

carefully

shipment.

If

the

unit

the

right

In

warranty, express, implied or

in writing

INSPECTION.

Each
is

damaged

be

filed

company.

one

be

free

from

defects in
vacuum

The

liability

returned

has

repair,

of

no

event

by
not
alteration

final

shall

the buyer,
been

determination as

damages.

it

and

signed

inspected

will

and

be

by

is

instrument should

in

any

way

with the

transportation

year

from

tubes,

at

subjected

or

SYSTRON-

binding

a duly

in

perfect

be

checked

or

fails

of

to

Whenever a SYSTRON-DONNER
SYSTRON-DONNER

representative
will provide immediate
to the factory

Please specify both

if

necessary.

model

instrument requires

service

and

concerning claims for warranty
SYSTRON-DONNER

Telephone:

i i

GMBH., 8 MONCHEN

(0811)

871

10

21.

REPAIRS.

service,

should

be

contacted. All representatives

or arrange the return

serial

repair.

60,

number

in

Address

all

all

BODENSEESTRASSE

the near

of

the in

est

str

correspondence

enquiries to
113,

TL

ument

8-3/2-73

TABLE

OF

CONTENTS

.

SECTION

1

2

3

4

5

DESCRIPTION

1.1 Introduction

......

1.2 General Features

1.3

1.4 Specification

Precautionary

Measures
Data

OPERATION

2.1

2.2

2. 3 Operation

THEORY

3.

1

Electrical

Controls

OF

OPERATION

Genera

1 .

Connections

..

. ...............

.........

....

..............

3.2 Optional Features

3.3

Block

Dfagram

. . . .. .

MAINTENANCE

4.

1

Genera

4.2 loads

1 . .

and

.•.••

Interconnection s

4.3 Troubleshooting

CALIBRATION

5. 1

5.2 Test

5.3

Genera

1

•..•

Equipment

.•.••.••..••.••..

Required .

Calibration Procedure . . ....

..............

.. ......

.....

Sheet .

..................

..

..........

..

......

.........

. ••

•...•

. . • . .

............

....

. . . . . ....

....

. . .......... . .

....

.....

......

..

..

....

. .

. . .

.

......

...

. . .

........

.........

•.•..•...•.•.•

.........

. ..

...

. .

..•.•...

.....

..........

.............

....

...

......

.....

...

...

..

.

....

....

.

.••.

. .
..
. .

. .

. .

PAG

E

.
.

1-1

1-1

1-2

.

.
.
.

1-3

2-1
2-1

2-2

3-1
3-2

3-3

4-1

.

4-1
4-1

5-1
5-1

.

5-1

TL

8-3/2-73

APPENDICES

Troubleshooting
Component
C

omponent

Schematic

Part Plan
Part Plan
Diagram

Guide

0001
0002

. .

. . . .

/ 2 .

/ 3 . . . .

...........

.......

..........

......

......

.

......

. .

A-1

t o

A-5

.

.

; i i

The

specifications
readily
proper
is
calibration
terminals
is
terminals will

attained

method

that

the highly

section

and

that

the voltage drop between the load terminals

MEASUREMENT

cited

on

of

measurement

stable

not the load terminals.

yield

herein

every

test

an

inacurate regulation

OF

REGULATION

for

SYSTRON-DONNER

is

employed.

meter

procedures,

and

oscilloscope,

AND

regulation

power

The

must

The

be

connected to the sensing

reason

ripple

RIPPLE

and

ripple
supply, provided the
major consideration

specified
for

and
measurement.

can

this

sensing

be

in the

precaution

i i i i

TL

8-3/2-73

SECTION

1

DESCRIPTION

1.1

INTRODUCTION

The
flexible
a

variety

production

and

dependable sources of

of needs.

testing,

The
suited
power

of

for use as basic laboratory

packaged in

most

systems

All

Half
subjected to

Rack

units are of the highest

100%

Each

has

been

quoted

ing ten

temperature

(10) years.

aged

metically sealed
ture

1.2

stabilized.

GENERAL

TL

8-3 Triple Output

These

to laboratory

wide

range

minimum

and

laboratory requirements.

components

incoming

electrolytic

by

the manufacturer

All

to provide high

silicon

needs

may

bench

of

outputs availab l e

space with high

used in the construction of the

inspection.

filter

silicon

transistors
reliability.

units,

and

FEATURES

Lab

Series

D.C.

power,

range in scope

testing

power

sources.

reliability

quality

available,

capacitor

as

having a

have

all

zener diodes

power

which

supplies

can

from

and

systems

makes

The

these

ability

meets

and

is

of

computer grade,

life

expectancy exceed-

been 11derated

All

rectifiers

have

are

be

used

to

inspection

applications.
units

well

to provide

the

demands

Medium

have

been

11

and

are her-

been

tempera-

meet

and

Power

and

Independent metering for each output allows simultaneous

of

monitoring

voltages
overload condition
controls for

Constant Voltage

each

Mode

A constant voltage

at

any

preset

load does not

value

draw

output permit precise

on

any

from

more

and

current.

of

the three outputs. Coarse

A

front

panel

lamp

indicates

and

adjustability.

is

maintained across the output terminals

zero to rated voltage output, provided

than the rated output

current.

an

fine output

that

Automatic Current Limiting

Short
Limiting
conditions.

circuit

The
approximately
the event of a

will return to

TL

8-3/2-73 1-1

which

point

110%

short

its

circuit

of

circuit,

protection

limits

at

which

the

maximum

the

maximum

automatic

rated current output of the

the output voltage will drop to zero,

previous level only

is

provided

upon

output
current

removal

by

the Automatic Current

current

limiting

under al l load

occurs

is

unit.

of

the short ci

rcuit.

the

at

In

and

Automatic Overvoltage Protection (Optional Feature, "

A"

output only)

Automatic

from

voltage

exceeding the

adjusted through

1.3

Wire

Size

PRECAUTIONARY

To

prevent severe

distortions

Overvoltage

programmed

an

access

slot

MEASURES

assure proper regulation under

of

the

(OV)

in the cover.

AC

line
to take into consideration the physical
bilities
increase in
lines.
input should not exceed

Voltage Regulator

power
nature,
serious loss
filtering
peak

of the input

ripple

The

maximum

source.

and

if

used

of the

rectified

power

may

result

AC

impedance

0.75

and

Inverter

Do

not use voltage

The

outputs

used

as

the

of

regulation

for

semiconductor

AC

line.

of
AC
of

wave

Serious losses in regulation

from

underrated or overloaded

from

ohms.

Inputs

regulators

these devices are usual
source
the

for

power

power

which

non-sinusoidal

provide.

protection prevents the output

voltage

size

the

the

and

all

voltage,

and

current

breaker

or

inverters as

power

can

be

internally

load conditions,
it

is

very important

handling capa-

and

AC

input

box

to the

power

a primary

ly

not sinusoidal in

supply,

may

cause

and

an

supply

supply output. Capacitive input

supplies requires charging to the

AC

sources

may

not

to

Systems

supply input
order to
keep

AC

Considerations

In

systems applications

power

m1n1m1ze

the

AC

ripple

cross coupling

input cables should not

cables.

line

be

run

separately

and

in the output to a

be

run in close proximity to the output load

it

is

recommended

to the

interaction

minimum, it

that

AC

distribution

each

powe

box, in

between equipment.

is

recommended

that

r

To

the

1-2

TL

8-3/2-73

.

SV~TADN

FEATURES

~DONNER

TL8-3

TRIPLE OUTPUT

LAB

SERIES

e THREE OUTPUTS -
e AUTOMAT
e NO TURN

IC ELECTRON

ON

e THREE INDEPENDENT DUAL RANGE M
e OVE

RVOLTAGE

INDEPENDENTLY

IC

CURRENT LIMIT

/TURN OFF TRANSIENTS

PROTECTION OPTION

ADJUSTABLE

ET

ING

ERS

ELECTRICAL SPECIFICATIONS

Input: 220

Output

A)

0 to + 8 VDC, 3 ampere; rating reduces to 2 ampere at 0

B)

0 to + 32 VDC, 1 ampere; rating reduces to 0.5 ampere at
OVDC.

C)

0 to - 32 VDC at 1 ampere; rating reduces to 0.5 ampere at
OVDC.

All

outputs are referenced to a common return electrically

isolated from

Regulation, Line: 0.02% or 2 mV*, for 200 -240VAC line change,

at any output within specifications.

Regulation, Load: 0.02%

output within specifications.

Ripple: 500
Stab

Measured at constant line voltage, load and ambient
temperature.

Tem
Temperature Range: 0
Recove

output
full load)

Short Circuit Protection: Automatic Electronic Current
AC Power Input Protection: Fuse.
Voltage Adjustment Range: Continously adjustable vernier

controls.

*Whichever is greater.

(1)

At maximum line voltage condition, the total output current should not exceed
80%

VAC

± 10%; 4 7-65 Hz

:<1>

Triple Floating; isolated from ground, 300

chassis ground.

or

5 mV*, no load to full load, at any

pV

RMS

; 3

mV

p-p.

(10

MHz)

ili

ty: 0.05% or

perature Coefficient: (0.02% + 400 ,uVWC

ry

Time: 50 microseconds to within 0.05%

voltage, for 80% step change

of

total allowable current.

10

mV*, for 8 hours after warm-up.

oc

to + 40 °C. ·

in

rated load (.21oad to

VDC

or

15 mV* of

Li

max.

VDC

miting.

Output

Impedance*

DC-1

Amps

0-3
0-

1

0-

1

0 to
0

to

Oto

Volts

+8VDC
+32VDC

-32VDC

.

Model

TL8-3EG

• N

omi

nal

KHz

0.003

0.010

0.010

GENERAL AND PHYSICAL
SPECIRCATIONS

Operation Mode: Constant voltage with automatic current

limiting.

Controls:
Voltage:

lution 1

Input Power: Front panel switch and indicator,
Metering:

selector

Terminals:
Front Panel: Positive output

output

Overvoltage Protection: Inte

tion is

Size: 7
Weight: 16 lbs.

Coarse and Fine; 0 to rated output; front panel. Reso-

mV

on fine contr

(3)

Combination Volt/Ammeters with front panel

switch.

C,

common return, chassis ground.

available, as a factory option on output A (0 to + 8

7

/a"

W x 47/a" H x

ol.

A,

rn

12e/1e"

AC

ON.

Positive output

al

adjustable overvoltage protec-

D

B,

Negative

VDC)

SVSTRCN

rlf£?.:)

G M B H

CONNER

8 Mi.inchen
Telefon

87110

60,

BodenseestraBe 113

21

Telex

5-29615

Block Diagram

Series Pass

Amplifier

Therma l ­Fuse

Line-

AC-Line

Fuse

Differential­Amplifier

+

~-----4---4--~--4---------------------------------~------~o

Differential-

-Refere

ces

Current-

f-:.--

--~~--------------(0

Sensing

Option:
OV-

Protection

Common

- C -

•11-l--~@

GND

Output

AC

LINE

7

FEET

3

PRONG

MALE

CORD

LONG

MOLDED

PLUG

WITH

-

13'

'

I

)

cl

1

\:

v

2

3/8

''

Description

The

TLB-3 Triple Output Lab

output unit specifically designed

IC

utilizing

provided to
a typical
simultaneously,
for typical auxiliary circuitry .
may be independen

circuitry. Independent

IC

9

l/2"

allow simultaneous
(digital

or

analog) breadbord circuit, as well as

two

additional independent

tl

y monitored

power

for

output

power

Output

-,

_j

t-

\_

~

supply is a multiple

laboratory applications

voltages are

to be supplied to

power

sources

voltage

and currents

(4)

RUBBER

U0-32

/

FEff

THREAD':D

OPTIONALOVS
MODULES

(REMOVABLE)

MOUNTING)

A

variety
providing
Th
convenience

The Triple Lab
tors permitting operation
rating without derating.

of

voltage and

unexcelled operational versatility and flexibility.

is output flexibility permits the

in

filling

Power

current

laboratory

Supply utilizes silicon

at

outputs

user

power

its maximum temperature

are available

to have complete

requirements.

semiconduc-

SECTION

2

OPERATION

2.1.
Input,

ELECTRICAL

Power

A

heavy

CONNECTIONS

duty 3 wire

prong provides a path for input

The

power

to

the
regulation
insufficient
from

the breaker

exceed

0.75

tightened,
arm

of a

variable

power

li~e

and

substantial

power

ohms.

and

any

box

handling

cord

must

be

increases in

handling capacity

to

the

power

All

AC

power

movable

electric

transformer) should

producing oxide coatings.

for

the

guide in

Care should

AC

input

making

lines.

this

be

exercised in

The

selection.

TABLE

2-1 -

figures

line

cord

and

power

ability

to the

of the

considered, as

ripple

of

these

molded

unit.

AC
serious

can

lines.

plug with grounding

power

lines

losses in

occur as a

The

AC

supply input connector should not

line

connections

contact surface (such

be

kept

selecting

listed

AC

INPUT

WIRE

must

be

securely

as

clear

of impedance

the proper wire

in Table 2-1 will serve

SIZE

feeding

result

AC

of

impedance

the wiper

size

as

a

Length of

10

feet

10

feet
feet

20

feet

50

Run

or

to
to
to

(Single

less

20
50

100

Output, Front Panel

Five bindung post terminals

output

and

ground connections.

feet
feet
feet

Lead)

Wire

Size

mounted

(AWG

on

the

Standards)

12
10

8
6

front

panel provide

TL

8-3/2-7 3

2-1

2.2

Front Panel

CONTROLS

FRONT

PANEL

CONTROLS

Name

AC

POWER

VOLTAGE

(Coarse)

VOLTAGE

(Fine)

METER

V,

(

Internal

require
necessary
caused

of

by

this

2.3

ADJUST

ADJUST

SELECT

I ) ( 2

All

internal

no

additional

to

adjust

component

instruction

any
aging or replacement,

manual

OPERATION

Function

Toggle switch,

Potentiometer,

Potentiometer,

controls

adjusts

adjusts

input

voltage output

voltage output

Rotary switch, controls function

pos.)

control

adjusting.

of

the

settings

internal

output meters

However,

controls

have

if

refer

been factory

it

should
due

to the

.

power

of

preset,

become

to

circuit

calibration

and

changes

section

Control

meter

select

Grounding

may

be

used in a

Power

power

On

switch SlOl to

Warm-up

However,

stability.

Settings

Set

switch

Either

Connect the

No

warm-up

a

30

minute

all

coarse
to

side

floating

AC-ON,

warm-up

and

V.

of

either

condition.

power

and

time

is

period

fine

output controls

output

supply

observe

necessary

is

may

be

to a nominal

that

pilot

to

place the

recommended

fully

CCW

and

set

the

grounded or the outputs

AC

power

lamp

unit

to reach

source.

DSlOl

into

rated

Set

glows

.

operation.

2-2

TL

8-3/2-

73

SECTION

3

THEORY

3.1.

supplies
stable
major

and

circuits.

GENERAL
The

purpose

is

to transform

adjustable

As

DC

each

of

the

and

rectify
output.
circuit

to the schematic diagram in the
Primary Input

rectifier

capacitors

DSlOl
is

glows,

immediate·ly

Input

diode

C3,

When
and

power

sets

ClO

AC

AC

(CRl,

and

power

pqwer

available

is

obtained through transformer TlOl

CRlO),

Cl7

.

switch SlOl

is

applied to TlOl. Regulated

.

Reference Supplies

The

C3

voltage appears across

reference

across

supplies~

CR25,

CR5

and

These reference voltages

CR6,

respectively.

OF

OPERATION

TL

8-3

Triple

the

AC

The

following paragraphs describe the

is

described, reference should

rear

of

this

(CR2,

CRll),

is

Output

input a well

manual.

(CR19,

set

to

AC-ON,

the

+12V

are,

Lab

and

in

Series

regulated,

CR20)

AC

DC

and

pilot

output

(+lOV,

turn,

developed

power

be

full

filter

lamp

+6.2V)

made

wave

power

The

ClO

voltage appears across the

reference supplies . These reference voltages

across

CR26,

CR14

and

CR15,

respectively.

-12V

are,

in

and

(-lOV, -6.2V)

turn,

developed

Series Regulator

The
rectifier
pass

transistors.

controlled

resistors.

of the

which

power

is,

rectified

sections

are

The

by

independent

Their overall

supply to increase

in

Each
turn,

pass

controlled

and

filtered

directed

conduction

circuitry

resistance

transistor

by

voltages

from

the

three

through each of the respective

of

each of these

which

or

decrease the output voltage.

is

causes

varies

in accordance with the

controlled

the corresponding voltage

transistors

them

to

act

by a driver

transistor

(error)

input

series

is

as

variable

amplifier.

Voltage

is

identical.
reference (see Reference Supplies)
the

(error)

amplifier.

Amplifier

The

theory

of

operation

for

A sample of the output voltage

at

the base of the input stage of

An

unbalance caused

by

a voltage change

all

three

is

compared

voltage amplifiers

with a

at

either

stable

the

output terminals or across the output control pots will appear as a

at

the

voltage change

collector

of

the

first

stage.

For

example,

an

need

TL

8-3/2-73

3-1

increase in output causes the
second
driver
output voltage to decrease.

transistor,
transistor.

turning

This causes the pass

off

first

the

stage

third

to

turn
transistor
to

be

turned

off,

and

turning

turning

off

and

on

off

the

the

the

Current Limit

In

drop

is

sensed across a small

As

current
on a transistor
stage
effect

3.2

Overvoltage

by
SCR

"fire"

output

transistor.

of

the

driver.

increases,

the voltage

of independently

OPTIONAL

(OV)

If

OV

pot, the

This applies a signal

and

place a "crowbar" across the output. This

and

activates

Circuit

the case

in

its

Protection

the

output voltage should use

OV

of

all

this

voltage drop

current

amplifier

shutting

FEATURES

sensing

the

current

three

resistance

limit

for

down

transistor

current

circuit

this

this

to

the gate of the

limit

limit

in

series

increases,

which

output. This

output.

above

will turnon, turning

circuit

which

circuits,

with each output.

eventually turning
turns

has

the threshold

SCR

short

turns

a voltage

off

the

first

the overall

on

the

causing

circuits

off

the pass

set
it

to
the

3-2

TL

8-3/2-73

CD

-

0

0

....

(C

+8-0utput

0

3

0

.....

-f

r

0

A'

0

(X)

'

m

G>

w

common

Output
C-

GND

(O)+A-Output

t t

1-Q-I

Current -Sensing

I

'l.,1

Series Pass

V-Adjust

I

6

T

::!r-

t

Protection
OV-

Option:

t

al-

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Amplifier

Different

~

I

V-Adjust

11

1:

.

J

1-D-1

Current-Sensing

I

T

6

v

Series Pass

•

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t-:-i

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..

Amplifier

Oif

(oJ

-

f.

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Amplifier

Differential

Adjust
V-

l

T

\l

(c))

(2)-

•II

•

Sensing

-

1-D-1

Current

7'\

I I

Series Pass

Amplit~

Amplifier

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(..)

........

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(..)

r

(X)

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Li-

Current-

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Fuse

Thermal-

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(..)

SECTION

4

MAINTENANCE

------------------------~----------

- W A R N I N G -

4.1.

strongly

GENERAL
This

power

recommended

High

that

Voltages

supply

Use

is

Are

Present

Caution

a prec1s1on inst rument . It

only experienced troubleshooting
perform troubleshooting operations or attempt
the

power

procedure

4.2

supply appears to
is

recommended

LOADS

1. Disconnect
unit

Connect a

2.
terminal.
the

AND

INTERCONNECTIONS

all

is

normally connected.

separate

This load should

unit

to operate

be

malfunctioning

for

isolating

interconnections

resistive

at

its

possible

dummy

be

maximum

voltage output.

3.

Apply

normal
indicate

nominal

AC

operation.

that

any

input

power

to

Satisfactory

malfunction previously

external in nature. All interconnections and lo

used in conjunction with

carefully

checked

for

electrical

this

power

personnel
to
at

and

repair

all,

defect

loads

the

unit.
the fol lowi
s.

to

which

load across each output

of su

fficie

nt value

rated current

the

unit

and

check

operati

on

at

this

encounter

ads

supply should then

defects.

is

If

ng

t he

to

allow

and

for
time would
ed,

is

normally

be

4.3

TL

8-3/2-73 4-1

TROUBLESHOOTING

1. Set

VOLTAGE

Using

check

listed

ADJUST

a 20,000

the

voltages across the various

in the

TROUBLESHOOTING

and

ohms

before the schematic diagram

The

manual.

if

the

load

on

which

tested

The

Schematic

unit

any

is

or

sample voltages

is

operating

output unless otherwise

grossly

the

incorrect

one

immediately preceding it, i s

Diagram

VOLTAGE

per

volt

at

and

VERNIER

voltmeter or

GUID

E, located

at

the

rear

listed

its

in this guide app

nom

inal AC input ,

specified

indicates

appropriate

controls ful

oscil

ly

loscope,

circuit components

immediately

of

this

instructi

and

. Any reading

that

the stage being

defect

sectio

ns of the Theory

CW.

ly

only

has

ive.

on

no

of Operation will prove helpful in
work.
easily

If

2.
prescribed
point-to-point

diodes,

Proper

polarity

obtained

voltage checks

values,

resistance

resistors,

to

from

the Schematic Diagram.

show

no

disconnect
transistors,

any

be

observed

noticeable

AC

when

deviations

power

checks across

in

that

troubleshooting

testing

can

from

and

proceed with

pots,

switches,

order.

be

the

When

3.
regulation,

determine

the

trouble

ripple,

dynamic

is

of

an

intermittent

etc.,

the use of

changes will

an

be

necessary.

nature,

such as poor

oscilloscope

to

4-2

TL

8-3/2-73

SECTION

5

CALIBRATION

5.1

assure
SYSTRON-DONNER

5.2

5.3

GENERAL
The

following adjustments should

optimum

operating

power

TEST

(A)

Oscilloscope, Tektronix

(B)

Differential

(C)

Time

(D)

Differential

(E)

DC

EQUIPMENT REQUIRED

Base

Ammeter,

CALIBRATION

(A)

Maximum
and 11Fi
Adjust
and

Voltage-

ne

maximum

R94

for each

(B)

(0

to

+8V)

8.00

VAC ± 10

Rotate the current

external

current

put
counter-clockwise
output voltage.
for

max.

capable

of

characteristics

supply.

Amplifier Plug

Plug

In,

VTVM,

Weston

PROCEDURE

11

fully

voltage control

(0

to

+8V)

~utput.

Maximum

mv.

DC

current
to 3.3

current.

is

3.3

be

and

(or equivalent)

Type

Tektronix
Fluke
Model

set

front

561

In,

Type

Model

901

panel 11V

Tektronix

825A

counter-clockwise

R92

to obtain the

Current ­Monitor
adjust

meter

Amps.

directi~n

Check

The

Vout
pot
and a variable

±100ma.

the

setti

maximum

maximum

set

output voltage equal to

with a scope

(R59)

until

ng

current

Amps.

made

maximum

when

necessary to

efficiency of the

Type

63

67

11

ADJ

for a 11

(0

to

fully

clockwise,

three outputs.

+32V),

R93

rated output voltage

(10mv/cm

fully

Slowly

an

affect

by

clockwise.

load

adjust

rotate

is

R59

seen

adjusting the variable

the

until

should

(0

to -32V),

scale).

With

the out-

in

the

on

the

be

an

TL

8-3/2-73

(c)

Meter

Circuit

position.

(Differential

each

meter

-32V

-Output

Place the meter
down
fully

one

with
output,
meter
calibrate

the 11C

indicate

11

- Place the meter

Adjust

VTVM,

by

adjusting the pot

and

R55a

select

output

adjust

the 11B

an

accurate

R16
the sa

at

11

meter with

each

output to

Fluke

for

switch in the

Model
m8V

-Output.

select

its

825A

R26a

switch in the volts

nominal

is

recommended).

for

Amps

voltage

+32V

-Output;

position,

±20mv.

then l

Calibrate

R51a

a time . Monitor the output current care-

DC

so

both the 11A

me

current.

meter

R54

by

.

current

adjusting

meter. For the 0 to

11

meter

For the 0 to

R50.

and

the reference

-32V

Finally,

+32V

output,
calibrate

for

oad

5-1

Symptom
Zero

output

voltage

Possible
Problem

AC

Area

Input Section

TROUBLESHOOTING

0 to

+32V

If

one

has
F101
S102

GUIDE

Output

the

AC

or

more

probably

open
open

Vin

·

~

No

load

otherwise

power

lamp

of the

failed.
circuit;
circuit.

220VAC

on

output unless

specified

(DS101)

components
S101

open

is

off,

listed

circuit;

Zero

or
small nega­tive

output
voltage

Zero

or
small pos­itive

out-

put voltage

Large

and
unregulated
output

volt-

age

Rectifier

Section

or

-6.2V·and

-10V

Reference Section

Pass

Series

and

Driver Section

Voltage Amplifier
Circuit

Current Limit
Circuit

Series Pass

and

Driver Section

or
Voltage Amplifier
Circuit

Measure

the voltages across the follow-

ing components.

measured

C3.,.~

Measure
base to

Q3

(across

sistor

with those indicated below.

26V;

CR14F-.'>·

the voltage drop across the
emitter

junction of

R9

and

junctions should

biased.

The

base to

Q5

and

in the forward

Q6

emitter

should

direction

transistor.

If

the voltage across

imately zero, then

and

CR7

reversed biased.

If

the voltage across
ficant,
in the supply.

are
Check

II

II
II

II

then there

The

probably shorted to

QlOl
Q3

Q20

05

Q6

for

collector

II II II

II
II
II

Check
lOV;

the levels

CR15~Y6.2V

QlOl

R6).

Both
be

forward

tran-

voltages of

be

about 0.6

for

that

R14

is

approx-

Q4

should

R14

is

current flowing

is

be

signi-

output terminals

common.

emitter short

II
II
II

II
II

11

and

Q20,

volts

cutoff

~

-~-

open

DC,

II

II
II

Output

does

not current
1 i mit

A-1

Voltage

Amp.

Ckt.

or

Current Limit Ckt.

or

-12V

Reference

Section

Probably
has

failed
Measure
level

is

Q4

has

failed

open

open.

the voltage across

approximately

12

and/or

CR26,

volts.

TL

CR7

the

8-3/2-73

Symptom

Possible
Problem

Area

Overload

lamp

does
not turn
when

current

limiting

Overload

lamp

always

on

on

Overload

Logic

Circuit

Overload

Logic

Circuit

Lamp

Lamp

Check

lamp.
limit

operation,

voltage

0.6

volts

Check

Q21

II

Ql

(Insure
current
Check

II

Q23

for

failure

With

of

the

Q21

in the forward

for

collector

II

that

no

1 i mit) .

Q24

for

collector

II

of

DS102

supply in

the base to

and

Ql

should

II II

other

output

II

overload

current

emitter

be

direction.

emitter

is

emit

ter

II II

about

short

II

in
short

TL

8-3/2-73

A-2

Symptom
Zero

or

sma

11

pos-

itive

out-

put voltage

TROUBLESHOOTING

0

to

Possible
Problem

Rectifier

Area

Section

or

-6.

2V

and

-lOV

Reference Section

GUIDE

-32V

Output

Measure

ing components.

the voltage across the follow-

Chec

k the

measured with indicated below.

C10~26V;

CR5~10V;

CR6~6.2V

levels

Zero or

small neg-

ative

out-

put voltage

Large

and
unregulated
output
voltage

Series Pass

and

Driver Section

Voltage Amplifier
Circuit

Voltage Amplifier
Circuit

or
Current Limit
Circuit

Current Limit
Circuit

Series

Pass

and

Driver Section

or
Voltage Amplifier
Circuit

Measure

base
Q8
sistor

the voltage drop across the

to

emitter

(across

junctions

R32

junction

and

R33).

should

biased.
The

base to

Qll

and

DC,

in the forward

transistor

If

the voltage across

imately
off

and

If

the voltage across
ficant,
in the supply.

emitter

Q12

should

.

zero,
CR16

then

be
direction

then

QlO

reversed biased.

there

is

The

are probably shorted
Check

Q102

II

Q8

II

Q9
Q12

II
II

Qll

for

II
II
II
II

collector

II
II II II
II II II
II

of

Q102

Both

be

forward

voltages of

about 0.6

R47

is

should

R47

is

current

and

tran-

Q9,

volts

for

that

approx-

be

cut-

signi-

flo

wing

output terminals

to

common.

emitter

short

II

II

open

II

Output
does

not
current
limit

Overload

lamp

does
not turn

when

current
limiting

A-3

Voltage Amplifier
Circuit

Current Limit
Circuit

+12V

Reference

Section

Overload

Logic

Circuit

on

or

or

Lamp

Measure

is

approximately

Possibly

CR16

Check

lamp. With
operation,
of

Q21

the voltage across

QlO

has

failed

for

failure

the supply in

the base to

and

Q24

in the forward

12

has

failed

open.

of

should
direction.

volts

DS102

emitter

be

CR25,

.

open

and/or

overload

current

volt

about 0.6

TL

8-3/2-73

this

limit

age
volts

TROUBLESHOOTING

GUIDE

Symptom

Zero

or

small neg-

ative

out-

put voltage

Zero

or

small pos-

itive

out-

put voltage

0 to

Possible
Problem

Rectifier

Area

Section

or

-6.2V

and

-lOV

Reference Section

Series Pass

and

Driver Section

Voltage Amplifier

Circuit

Current Limit
Circuit

+8V

Output

Measure

ing components.

the voltage across the follow-

Check

the levels

measured with those indicated

(at

no

load) .

CR15~6.2V.

Measure

base to
Q13

sistor

the voltage drop across the

emitter

(across

junctions should

Cl7~17.5V,

junction of

R57

and

R56).

be

biased.
The

base to

Ql6

and

DC,

in the forward

Q17

emitter
should

voltage of

be

about 0.6

direction

transistor.

If

the voltage across

R65

approximately zero, then
should
junction

be

cut-off.

of

Q23

The

should

base to

be

biased.

below

CR14;~10V,

Ql03

Both

and

tran-

forward

Q15,

volts

for

that

and

R98

is

Q14

and

Q23

emitter

reversed

Large

and
unregulated
output
voltage

Current Limit
Circuit

or
Overvoltage
Circuit

Overvoltage
Circuit

And

Series pass

and

Driver Section

or

Vo

ltage

Amplifier

Circuit

If

the voltage across

significant,

flowing

in
terminals
together,

then

the supply.

are

possibly

probably shorted

R65

there

is

The

by

the overvoltage

circuit.

Set

R74

fully

The

and

base
Ql9

to

should
forward biased.
be

equal to the observed output.

Check

Ql03

II

Ql3

II

Q15

II

Q17

II

Ql6

CW.

emitter

be

for

collector

II

II

II
II

voltages

approximately

Ql9

collector

II
II

II
II

and

R98

current

output

of

should

emitter

II
II II
II II
II

is

Q18

0.6V

short

II

open

TL

8-3/2-73

A-4

I

I

0

Possible

Symptom

Problem

Area

Overvoltage
triggers,
even

though
output
normal
R74
fully

Output does
not
limit

Overload

lamp

not
during
current

limiting

is

and

is

set

CCW

current

does

light

Overvoltage
Circuit

or

-12V

Section

Current Limit Ckt.

+12V
Section

-12V

Section

Overload

logic

Reference

or
Reference

or
Reference

lamp

circuit

Check
Measure

the level should

Q14
Measure
ing components.
measured with those indicated
CR251?'l'l2V;

Check
lamp).
limit
voltage

0.6V

Ql8

II

failed

forward biased.

for

Ql9

for
operation,

II

the voltage across

open

the voltage across the follow-

CR26 ~ 12V.

failure

With
of

the supply in

Q21

collector

II II

be

12

or

CR23

Check

of

DS102

the base

and

Ql

should

emitter

CR26;

volts.

failed

the

levels

(overload

current

to

short

II

open.

below

emitter

be

about

.

0

@

J

A-5

TL 8-3/2-73

~

l

(

c