2500_Users_Manual- - 第260页

2280-2 PIN INSULATION BLOCK PROGRAMMING BLOCK CIRCUIT BOARD FRONT OF HANDLER DEVICE Repair and Replacement Procedures The pin insulation block is symmetrical so no specific polarity orientation is required; it may be ins…

1930-1

PRINTED

CIRCUIT

BOARD

Repair

and

Replacement

Procedures

Figure

7-26

Replacing

the

Defective

Pins

2.

Using

the

needle

nose

pliers,

insert

the

replacement

pin

in

the

same

hole

in

the

block.

3.

To

ensure

that

the

pin

is

seated

correctly,

use

the

pliers

(or

flat

end

of

a

flat-blade

screwdriver)

to

press

down

on

the

spring-loaded

pin

until

it

is

flush

with

the

block.

Do

not

use

any

object

to

push

the

pin

farther

down

the

hole.

4.

Continue

replacing

any

other

questionable

pins,

and

then

test

the

module

by

running

a

device-related

operation

on

the

system.

Replacing

the

Pin

Insulation

Block

After

a

high

number

of

device

insertions

in

the

programming

module,

the

holes

in

the

pin

insulation

block

may

become

enlarged

or

elongated.

This

increase

in

hole

size

may

eventually

allow

too

much

movement

of

the

module

pins

while

a

device

is

being

inserted,

resulting

in

a

higher

number

of

continuity

test

and

device

programming

errors.

If

you

experience

a

gradual

increase

in

these

failures,

examine

the

insulation

block

for

enlarged

pin

holes.

If

you

determine

that

the

pin

insulation

block

needs

to

be

replaced,

perform

the

following

steps.

1.

Remove

all

module

pins

(gold

spring-loaded

pins)

from

both

pin

insulating

blocks.

2.

Turn

the

module

upside-down

and

remove

the

two

recessed

Phillips

screws

that

hold

the

programming

block

to

the

circuit

board.

After

the

screws

have

been

removed,

the

programming

block

will

still

be

held

to

the

board

by

the

physical

tension

caused

by

the

two

alignment

pins.

3.

Pull

the

board

straight

up

and

away

from

the

block.

4.

Remove

both

pin

insulation

blocks

from

the

programming

block

with

a

pair

of

needle-nose

pliers.

5.

Insert

two

new

pin

insulation

blocks.

ProMaster

2500

User

Manual

7-35

2280-2

PIN INSULATION

BLOCK

PROGRAMMING

BLOCK

CIRCUIT BOARD

FRONT

OF

HANDLER

DEVICE

Repair

and

Replacement

Procedures

The

pin

insulation

block

is

symmetrical

so

no

specific

polarity

orientation

is

required;

it

may

be

inserted

into

the

programming

block

either

way.

6.

Carefully

plug

the

programming

block

onto

the

circuit

board

using

the

block's

alignment

pins

as

guides.

The

programming

block

is

symmetrical

so

no

specific

polarity

orientation

is

required;

the

block

may

be

inserted

on

the

circuit

board

either

way.

The

block

is

seated

on

the

board

correctly

when

rests

against

the

board

on

all

sides

without

a

gap.

If

a

gap

exists,

remove

and

reseat

the

block.

7.

Turn

the

module

upside

down

and

reinsert

the

two

Phillips

screws

on

the

bottom

of

the

circuit

board.

8.

Reinsert

the

spring-loaded

module

pins

in

the

insulation

block.

Note:

One

end

of

the

module's

gold

contact

pin

is

spring-loaded

a/id

telescopes

when

pressed.

Reinsert

the

module

pin

into

the

new

insulation

block

with

the

telescoping

end

up

so

that

end

contacts

the

device

lead

during

programming.

Most

SOIC

programming

modules

ship

without

some

pins

in

the

pin

insulation

block

at

the

narrow

end

of

the

module

board.

Start

reinserting

pins

in

the

block

holes

nearest

the

wide

end

of

the

circuit

board

and

work

toward

the

narrow

end.

Fill

both

insulation

blocks

with

an

equal

number

of

module

contact

pins.

Figure

7-27

shows

a

device

over

the

pins

at

the

wide

end

of

the

board.

Figure

7-27

Pin

Insulation

Block

in

the

Programming

Module

)

,

°

J

J

9.

To

ensure

that

the

contact

pin

is

seated

correctly,

use

the

pliers

to

press

down

on

each

pin

until

it

is

flush

with

the

module's

top

surface.

Do

not

use

any

object

to

push

the

pin

farther

down

the

hole.

7-36

ProMaster

2500

User

Manual

Repair

and

Replacement

Procedures

10.

Test

the

module

by

running

a

device-related

operation

using

the

module.

Replacing

the

Programming

Block

on

a

PLCC

Module

After

a

period

of

time,

the

protective

coating

on

the

programming

block

(see

Figure

7-28)

may

wear

to

the

point

that

you

begin

to

see

a

higher

number

of

device-related

errors.

If

you

have

a

second

module

of

the

same

pin

count,

you

can

confirm

that

wear

is

the

source

of

these

problems

by

programming

the

same

type

of

device

on

the

second

module

and

comparing

the

yields.

CAUTION:

To

avoid

possible

damage

to

the

system

components,

this

procedure

should

be

performed

only

by

a

qualified

service

technician.

ProMaster

2500

User

Manual

7-37