DATA PRECISION 1350 User Manual

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62-5008

MODEL

1350

5.3

ACCESS

TO

MODEL

1350

DMM

ASSEMBLIES

&

TEST

POINTS

WARNING:

Disconnect

line

power

before

removing

covers.

a.

Access

to

ttie

internal

assemblies

of

Model

1350

DMM

is

obtained

by

removing

tfie

top

and

bottom

covers.

Ttiis

is

accomplisfied

by

first

remov

ing

tfie

four

retaining

screws

in

tfie

rear

panel

(Items

1

and

6

in

Figure

2-3).

Tfien

lift

up

tfie

top

cover

and

slide

to

tfie

rear

to

disengage

tfie

front-dowel.

Remove

2

screws

fastening

tfie

PC-txiard

to

tfie

bottom

cover.

Remove

tfie

bottom

cover.

Tfie

major

assemblies

witfiin

tfie

instrument

are

identified

in

Figure

5-2.

Test

points

are

accessible

on

tfie

underside

of

tfie

PC-board.

Note

tfiat

tfie

display

assembly

is

mounted

on

a

flex

print

tfiat

is

fastened

to

tfie

front

panel

by

press-on

plastic

nuts,

wfiile

tfie

electrical

connections

are

made

by

solder

connec

tions

at

tfie

rear

of

tfie

main

PC-card

assembly.

To

obtain

access

to

some

test

points

beneatfi

tfie

connector

assembly,

carefully

remove

tfie

four

press-on

plastic

nuts

holding

the

display

flex

to

the

front

panel

assembly

(Figure

5-2)

and

lift

the

display

above

the

main

pac-card

to

allow

access

to

the

parts

and

component

test

nodes

on

the

card.

b.

Figure

5-3

indicates

the

location

of

the

test

points

provided

on

the

top

and

bottom

of

the

board

to

facilitate

the

trouble-shooting

process.

The

illustration

also

identifies

all

component

locations

as

well

as

the

circuit

nodes

that

are

useful

in

the

trouble-shooting

procedures

described

in

later

paragraphs.

c.

After

removing

the

DMM

top

and

bottom

covers

and

after

detaching

the

display

flex

assembly

from

the

front

panel

assembly,

examine

the

main

assembly

very

carefully.

Look

for

any

evidence

of

burned

or

charred

components

or

circuit

board

etch.

Look

for

any

signs

of

mechanical

damage

or

water

damage.

Clean

the

assembly

and

remove

any

dirt

or

dust.

5.4

OPEN-CASE

TROUBLE

SHOOTING

PROCEDURES

WARNING

High

voltages

are

present

near

the

transformer

and

fuses

when

the

power

is

connected.

Use

caution

when

performing

any

trouble-shooting

diagnoses

when

power

is

applied.

Power

should

be

removed

at

the

source

before

replacing

any

components.

'CopyriBht

1977.

Data

Pracision

Corporation.

All

right

5-3

Table of Contents

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DATA PRECISION 1350 Specifications

General

Brand	DATA PRECISION
Model	1350
Category	Multimeter
Language	English