Milwaukee 6184-01 Operations Instructions download pdf (Page 55)

Maintenance--7[387

9

.

Use

a

soldering

iron

that

is

connected

to

earth

ground

.

10

.

Use

only

special

anti-static

suction

type

or

wick

type

desoldering

tools

.

TROUBLESHOOTING

EQUIPMENT

The

following

equipment,

in

addition to that

listed

in

the

Performance

Check

and

Adjustment

section,

is

useful

for

troubleshooting

.

Transistor

Tester

Description

:

Dynamic-type

tester

.

Purpose

:

Test

semiconductors

.

Recommended

Tektronix

types

:

576

Curve

Tracer,

577/177

Curve

bracer

system,

7CT1

N

Curve

Tracer

unit

and

a

7000-series

oscilloscope

system,

or

a

5CT1

N

Curve

Tracer

unit

and

a

5000-series

oscilloscope

.

Multimeter

Description

:

Voltmeter,

10

megohm

input

impedance

and

a

range

from

0

to

at

least

50

volts

dc

;

accuracy,

within

0

.1%

.

Ohmmeter,

0

to

20

megohms

.

Test

probes should be

insulated

to

prevent

accidental

shorting

.

Purpose

:

Check

voltage

and

resistance

.

Test

Oscilloscope

Description

:

Frequency

response,

do

to

100

megahertz

minimum

;

deflection

factor,

5

millivolts

to

5

volts/division

.

A

10X, 10

megohm

voltage

probe

should be used

to

reduce

circuit

loading

.

Purpose

:

Check

operating

waveforms

.

TROUBLESHOOTING

TECHNIQUES

The

following

troubleshooting

procedure

is

arranged

to

check

the

simple

trouble

possibilities

before

proceeding

with

extensive troubleshooting

.

The

first

few

checks

ensure

proper

connection,

operation,

and

adjustment

.

If

the

trouble

is

not

located

by

these

checks,

the

remaining

steps

aid

in

locating

the

defective

component

.

When

the

defective

component

is

located,

it

should

be

replaced

using

the

replacement

procedure

given

under

Corrective

Maintenance

.

TROUBLESHOOTING

PROCEDURE

1

.

CHECK

CONTROL

SETTINGS

.

Incorrect control

settings

can

indicate

a

trouble

that

does

not

exist

.

If

there

is

any

question

about

the

correct

function

or

operation

of

any

control,

see

Operating

Instructions,

Section

2

.

2

.

CHECK

ASSOCIATED

EQUIPMENT

.

Before

troubleshooting,

check

that

the

equipment

used with

this

instrument

is

operating

correctly

.

Check

that

the

signal

is

properly

connected

and

that

the

interconnecting

cables

are

not defective

.

Also,

check

the

power

source

.

If

the

trouble

persists,

the

time-base

unit

is

probably

at

fault

.

3

.

VISUAL

CHECK

.

Visually

check

the

portion

of

the

instrument

in

which

the

trouble

is

located

.

Many

troubles

can

be

located

by

visible

indications

such

as

unsoldered

connections,

broken

wires,

damaged

circuit

boards,

damaged

components,

etc

.

4

.

CHECK

INSTRUMENT

ADJUSTMENT

.

Check

the

adjustment

of

this

instrument,

or

the

affected

circuit

if

the

trouble

appears

in

one

circuit

.

The

apparent

trouble

may

be

the

result

of

misadjustment

.

Complete

adjustment

instructions

are

given

in

the

Performance

Check

and

Adjustment,

Section 5

.

5

.

ISOLATE

TROUBLE

TO

A

CIRCUIT

.

To

isolate

trouble

to

a

circuit,

note

the

trouble

symptom

.

The

symptom

often

identifies

the

circuit

in

which

the

trouble

is

located

.

When

trouble

symptoms

appear

in

more

than

one

circuit,

check

the

affected

circuits

by

taking

voltage

and

waveform

readings

.

Incorrect

operation

of

all

circuits

often

indicates

trouble

in

the

power

supply

.

Check

first

for

correct

voltages

of

the

individual

supplies

.

However,

a

defective

component

elsewhere

in

the instrument

can

appear

as a

power-supply

trouble

and

may

also

affect

the

operation

of

other

circuits

.

Figure

4-6

provides

a guide

for

locating

a

defective

circuit

.

Start

at

the

top

of

the

chart

and

perform the

checks

given

on

the

left

side

of

the

page

until

a

step

is

found

that

does

not

produce

the

indicated results

.

Further

checks,

or

the

circuit

in

which

the

trouble

is

probably

located,

are

listed

to

the

right

of

the

step

.

The

shaded

blocks

on the Troubleshooting Chart

indicate

circuit(s)

that

may

cause

instrument malfunction

.

The

circuit(s)

listed

in

shaded

blocks are

discussed

in detail in

the

Theory

of

Operation

section

of

this

manual

.

This

chart

does

not

include

checks

for

all

possible

defects

;

use

steps

6

and

7

in

such

cases

.

After

the

defective

circuit

has

been

located,

proceed with

steps

6

and

7

to locate

the

defective

component(s)

.

6

.

CHECK

VOLTAGES

AND

WAVEFORMS

.

Often the

defective

component

can

be

located

by

checking

for

the

correct

voltages

andwaveforms

in

the

circuit

.

Refer

to

the

diagrams

section

at

the

rear

of

the

manual

for

typical

voltages

and

waveforms

.

Voltages

and

waveforms

given on

the

diagrams

are not

absolute

and

may

vary

slightly

between

instruments

.

To

obtain

operating

conditions

similar

to

those

used

to

take

these

readings,

see

the

voltage

and

waveforms

page

adjacent

to

each

schematic

diagram

.

Note

the

recommended

test

equipment,

front-panel

control

settings,

voltage

and

waveform

conditions,

and

test

equipment

cable

connection

instructions

.

NOTE

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