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958-31

REV.

B

9.3

MEMORY

CLEAR

PROCEDURE

J;-*

NOTE

-:-*

Thrs

process

should

only

be

performed as

a

last

dltch

effort

to

correct

the controller

display

operation.

In normal

operation

the

replacemertt

of the

EPROM

will not

cause

any

problems.

The followrng

procedure

must

be

followed

in

order

to

correct

the

temporary

problem

caused

by

replacing

the EPROM

when

the

earller

program does

not

use

the

same

memol-y

locations

as

the new

EPROM.

A) Turn

on

the

control

Ier

confi-guration

number

on

the

Section

6.

)

B)

Enter

the

part

Number

change

code

so

that

the

cursor

1s

blinking

on

and

off

on

the first

changeable

dj-git

of

the

part

or

configuration

nunber'

C)

Change

the

blinking

dicit

using

the UP/YES

or D0tlN/NO

keys

to

zero

(Modei

2015

to

"G";

Models

2003

and 2004

to

"A").

Continue

through

each

digit

of

the

part.

or

confiEuration

number

to set

each

of the

rernaining

diglts

to zero '

D) At

this

point,

while in

the

CAL LOOP,

turn

off

the

AC

power

to the

unit

and

then

reapply

power.

The controller

will

now

lndicate

DATA

LOST,

PI-EASE

CAL

on

the

display.

The controller

memory

is

now

cleared.

E)

The controller

must

be RECONFIGURED

and RECALIBMTED

per

Section

6.

entered

bv the

user

in the

TUNE

LOOP

must

also

be reentered.)

(

Pararneters

and

follow

the

procedure

to

indicate

the

part or

di.splay

in

the

CONFIGURATION/CALIBMTION

L00P'

(See

9.4

F)

If the

above

procedure

does

not

MICROPROCESSOR

REPLACEMENT

(U1

_

CPU

correct

the

problem, contact

the

factory.

BOARD)

The mi-croprocessor

chip

(Ul

)

is

an

8

brt

conputer

chip

that

uti I

r zes

pro8ralrr

instructions

from

the EPR0M

(U2)

and data

stored

in the

RAM

integrated

circuit

(lll)

to

perform

all

control and

display

decisions.

The

microprocessor

device

(8011)

can

be

replaced

if a failure

should

occur

and

can

be

ordered

from

the factory

by

part

nurnber

2036-330.

Static

discharge

precautions

should

be taken

wherr handling

any

MOS

device.

Refer

to

thE MOS

STATIC DISCHARGE

HANDLING

PRECAUT]ONS

(SCC

SCCIiON

I.I3.

This

device is

socket

mounted

and

can

be rernoved

with

IC

extracti-on

tools.

Wherr

replacing

the

"yP"

be sure

that lt

is correctly

oriented

and

then

firmly

pressed into

its

socket.

The

controller

after

reinstallation

into

its

case

nay

have

to be

recalibrated

if

the

display

"DATA

LOST

-

PLEASE CAL"

appears,

but

normally

recalibration

ls

not

necessary

if

no other

devices

other

than U-1

were

rernoved.

LFE Instruments

Division

-90-