2500_Users_Manual- - 第259页

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…

Repair

and

Replacement

Procedures

9.

When

the

contact

set

is

in

position,

insert

and

tighten

the

two

hex

screws

that

hold

it

in

place.

The

programming

block

consists

of

two

pieces:

a

top

and

a

base.

The

contact

set

screws

hold

the

top

and

base

together.

Keep

at

least

one

contact

set

installed

so

the

top

does

not

separate

from

the

base.

If

the

top

and

base

come

apart,

refer

to

page

7-38,

step

9

for

instructions

on

reassembling

the

programming

block.

10.

Replace

the

worn

contact

sets

on

the

remaining

three

sides.

Note:

Replace

all

four

contact

sets.

Mixing

new

sets

with

old

will

make

让

difficult

to

determine

which

of

the

sets

is

causing

a

problem.

11.

Turn

the

assembled

programming

block

upside-down

and

insert

the

device

ejector

pin

and

its

spring

into

the

programming

block.

CAUTION:

The

capacitor

configuration

blocks

should

not

be

installed

on

the

board

when

the

programming

block

is

being

inserted

on

the

programming

module

board.

Pins

on

one

of

the

contact

sets

might

力

oo

及

on

the

block

and

become

bent

or

damaged.

12.

Using

the

block

alignment

pins

as

guides,

carefully

slide

the

board

and

block

together.

13.

Install

the

two

hex

screws

mounting

the

block

to

the

board.

14.

Install

the

configuration

blocks

for

the

next

device

to

be

programmed.

Refer

to

page

4-7

for

more

information

on

configuring

the

module.

15.

Check

the

operation

of

the

programming

module

using

a

device

type

that

usually

gives

you

high

yields.

Replacing

Pins

on

a

SOIC

Programming

Module

Use

the

following

procedure

to

replace

the

spring-loaded

pins

on

any

of

the

SOIC

programming

modules.

CAUTION:

To

avoid

possible

damage

to

the

system

components,

this

procedure

should

be

performed

only

by

a

qualified

service

technician.

1.

Set

the

module

on

a

flat

surface

and

grasp

the

defective

pin

with

a

pair

of

needle

nose

pliers.

Pull

the

pin

straight

up

and

out

of

the

programming

block

(see

Figure

7-26).

7-34

ProMaster

2500

User

Manual

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