2500_Users_Manual- - 第206页

2142-1 WAVEFORM BOARD 78-PIN CONNECTOR MASS STORAGE MODULE Preventive Maintenance 2. Check the 8 MHz programming electronics clock frequency by placing the ground probe of your scope (or frequency counter) on pin 1 (grou…

Preventive

Maintenance

Checking

the

Reference

Points

The

programming

electronics

(PE)

assembly

in

the

ProMaster

2500

has

no

service

calibration

potentiometers

that

need

to

be

adjusted.

The

procedure

described

below

explains

how

you

can

confirm

the

critical

reference

levels

that

must

be

present

for

the

programming

electronics

assembly

to

run

its

performance

verification

and

self-test

accurately.

If

any

of

the

checks

described

below

are

outside

the

specified

ranges,

contact

Data

I/O

Customer

Support

as

listed

in

the

Preface.

WARNING:

This

procedure

should

be

performed

only

by

trained

electronics

service

personnel.

When

servicing

the

ProMaster

2500,

there

is

significant

risk

of

electric

shock

and

injuiy

from

moving

parts

(mechanical

injury).

Do

not

attempt

this

procedure

unless

you

have

been

trained

and

are

qualified

to

do

so.

Note:

instruments

used

for

calibrating

the

ProMaster

2500

must

be

maintained

under

a

normal

calibration

validation

cycle.

You

will

need

the

following

tools

and

equipment:

•

Hex

wrench

set

•

Grounded

wrist

strap

•

Antistatic

workstation

•

Digital

multimeter,

accurate

to

two

decimal

places

•

Oscilloscope

or

frequency

counter

Note:

To

access

the

programming

electronics,

refer

to

the

“Programming

Electronics

Assembly

ReplaceInent,,

section

加

Chapter

7.

Follow

the

steps

below

to

check

the

mandatory

reference

elements

used

by

the

software

in

the

programming

electronics

assembly

during

its

performance

validation:

1.

Locate

the

78-pin

connector

on

the

mass

storage

module

(MSM)

board

(see

Figure

5-21).

Pins

1

and

78

are

located

on

the

lower

end

of

the

connector;

pins

39

and

40

are

at

the

high

end,

near

the

RS-

232c

connectors

on

the

controller

/waveform

board.

The

pins

that

you

will

be

checking

for

this

procedure

are

shown

in

Figure

5-21

and

are

listed

below:

•

Pin

1:

Ground

•

Pin

24:

+15V

input

supply

voltage

•

Pin

28:

8

MHz

programming

electronics

clock

•

Pin

78:

+10V

precision

reference

voltage

ProMaster

2500

User

Manual

5-51

2142-1

WAVEFORM BOARD

78-PIN CONNECTOR

MASS STORAGE

MODULE

Preventive

Maintenance

2.

Check

the

8

MHz

programming

electronics

clock

frequency

by

placing

the

ground

probe

of

your

scope

(or

frequency

counter)

on

pin

1

(ground)

and

the

input

probe

on

pin

28

(see

Figure

5-22).

The

clock

frequency

should

read

between

the

minimum

and

maximum

values

shown

below:

Minimum

Nominal

Maximum

7.999

MHz

8.000

MHz

8.001

MHz

3.

Check

the

+10V

precision

reference

by

reading

pin

78

(+10V)

using

your

digital

multimeter

(see

Figure

5-14).

The

+10V

signal

should

read

between

the

minimum

and

maximum

values

shown

below:

Minimum

Nominal

Maximum

+9.090V

10.000V

10.010V

Figure

5-21

Position

of

the

78-pin

Connector

on

the

Mass

Storage

Module

5-52

ProMaster

2500

User

Manual

178

3940

PIN 28 (8MHz)

PIN 24 (+15V)

PIN 1 (Ground)PIN 78 (+10V)

PIN 72 (Plugged)

2143-1

Preventive

Maintenance

4.

Check

the

+15

reference

by

reading

pin

24

(+15V)

on

the

connector

block

(see

Figure

5-14).

The

+15V

signal

should

read

between

the

minimum

and

maximum

values

shown

below:

Minimum

Nominal

Maximum

+14.25V

+15.00V

+15.75V

This

completes

the

performance

verification

for

the

programming

electronics

assembly.

If

any

of

the

measurements

described

above

are

outside

the

specified

ranges,

contact

Data

I/O

Customer

Support

as

listed

in

the

Preface.

You

cannot

access

the

self-test

command

from

TaskLink's

operator

mode.

To

perform

a

self-test

you

must

be

in

TaskLink's

administrator

mode.

To

start

this

self-test,

perform

the

following

steps:

1.

From

the

DOS

prompt,

start

TaskLink

in

administrator

mode

by

entering

tl

a

on

your

PC

keyboard

at

the

DOS

prompt.

If

you

are

already

running

TaskLink,

exit

TaskLink

and

restart

it

in

administrator

mode.

2.

Select

Programmer

Interface

from

the

Utilities

menu.

3.

Check

the

programming

module

to

verify

that

no

device

is

installed.

Figure

5-22

Test

Points

on

the

MSM

78-p

加

Connector

Running

the

Self-test

ProMaster

2500

User

Manual

5-53