DATA PRECISION 5740 - Maintenance; General Maintenance Information; Technician Qualification Requirements; Trouble-Shooting Strategy

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72-1002

Model

5740

COUNTER

4.1

GENERAL

CAUTION

The

Model

5740

Multi-Function

Counter

is

covered

by

a

one-year

warranty,

and

the

instrument

should

be

referred

to

the

factory

for

maintenance

if

required

within

the

warranty

period.

(All

shipping

charges

are

paid

by

the

purchaser).

Attempts

to

make

any

extensive

re

pairs

within

the

warranty

period

may

invalidate

the

warranty.

If

repairs

are

needed

after

the

war

ranty

period,

only

qualified

tech

nicians

should

attempt

to

effect

such

repairs

and

should

use

test

instruments

and

standards

cali

brated

within

the

accuracy

and

tolerance

of

the

specifications.

4.1.1

Technician

Qualifications

A

complete

understanding

of

the theo

ry

of

operation

of

Model

5740

is

a

pre

requisite

for

efficient

trouble-shoot

ing,

repair,

and

recalibration

of

the

instrument.

Technical

training

and

ex

perience

necessary

to

master

the

tech

nical

material

in

Chapter

3,

along

with

MAINTENANCE

hands-on

experience

with

the

operation

of

test

equipment

specified

in

Para

graph

4.2

are

considered

minimal.

4.2

TROUBLE-SHOOTING

STRATEGY

4.2.1

Overall

Flow

Diagram

Model

5740

functional

circuit

grouping

and

the

provision

of

(carefully)

selected

test-points

greatly

simplify

the

isolation

of

trouble

to

major

circuitry

blocks.

Fault

isolation

within

each

major

block

is

facilitated

by

the

simplified

schematics

of

Chapter

3,

and

by

point-to-point

mea

surements

made

with

reference

to

the

fold-

in

schematic

at

the

back

of

the

book.

Re

placement

parts

should

be

ordered

in

ac

cordance

with

the

lists

in

Chapter

5.

Figure

4-1

is

a

block

flow

diagram

of

a

Trouble-Shooting

decision

tree

that

il

lustrates

the

sequence

followed

and

iden

tifies

the

paragraphs

for

the

detailed

in

structions

that

follow.

It

should

be

noted

that

a

general,

over-all

performance

check

is

suggested

to

determine

instrument

operational

readiness,

and

that

a

sequence

of

closed-case

operating

checks

with

an

external

signal

is

suggested

to

verify

op

erational

readiness

of

the

major

count

ing/measuring

functions.

CLOSED

UNIT\

ok

VISUAL

DISPLAY

ANALYSIS

R/R

DISPLAY

OVERALL

OPERATIONAL

NG

POWER

OK

TIME

BASE

OK

COUNTER-

OK

INPUT

PERF

CHECK

CHECK

CHECK

DISPLAY

CONDIT'

OK

GD

IE

ATTEN.

TRIG

SENSITIVITY

CHECK

~^D

:GE);

PROGRAMM.

DIVIDER

CHECK

INTERCYCLE

OSCILLATOR

CHECK

-(E)

Fig.

4-1.

Overall

Trouble-Shooting

Flow

Diagram

COPYRIGHT

1976

OATA

PRECISION

CORPORATION.

PRINTED

IN

THE

4-1