Campbell 21X Návod k obsluze stáhnout pdf (Strana 175)

The 21X

has

and

three

ho

chips

and

as

APPENDIX

E. CHANGING

RAM

OR

PROM

CHIPS

sockets

for

memory

chips.

Five sockets

hotd

8K

Random

Access

Memory

(An@

9lttps

prigi^^"firc

neid

Onty

tttemory

FROM)

chips.

Older

21Xs

may

have

two

PROM

'ew

as

two

RAM chiPs.

2.

Lay

the micrologger

face

down

on

a

padded

surface.

Remove

the

four Phillips

head

screws

from

the

corners

of the

aluminum

back

plate.

Lift the

back

plate

up and

away

to expose

the

21X

CPU

board.

Figure

E-l

shows

the

CPU

card;

the memory

chips

are

in

the

lower

right

hand

corner.

The

locations

numbered

1-5

hold

RAM

chips.

Locations

8, 7, and

6

hold PROM

chiPs.

E.l

DISASSETI'IBLY

OF

21X

1.

Turn

pourcr

off,

remove

the

two

Phillips

head

scr4ws

located

near

the

edges

of the

front

pan$l

of

the micrologger.

Carefully

lift

the

microfogger

up and

away

from

the

battery

P{ck

and

disconnect

the

plastic

power

cofnector.

6

i:1

|

:r-

51

t

llc

,!3

I

P

t:ta

N

l.d

".;

hN

l':-.(

E

i.:,JO

l4al

l-

-.-

(

F}

il

FIGURE

E-1.

Memory

Sockets

on

CPU

Card

E,2

INSTALLING

NEW

RAM CHIPS

The standard

21X

has the

maximum

memory

allowable.

In

the

unlikely

event

that

a

RAM

chip

fails, the

21X

can

detect

the bad

chip

during

its

power-up

mernory

check

(Section 1.5).

As a

iesult

of this

OhecktheZlXdisplays

the status

of the

memoil

chips

as

a sequence

of

1s

and

0s,

each

reprfsenting

a chip

with the

status

of

chip

1 on

the

feft

and

8

on

the

right;

0

indicates

a bad

chip.

flor

example,

11011111

indicates

that

chip

3

(Flgure

E-l)

is bad.

To

replace

a

RAM

chip

carefully

pry

the

old

chip

with

a smallflat

blade

screwdriver,

start

at

one

end

and

then

loosen

the other,

alternating

until

the

chip

is free.

The

new

chip should

be

installed

with the

notched

end

in

the same

direction

as

the

other

chips,

to the

right

side

of

the

card

in Figure

E-l.

Before

pushing

the

chips

into

the

socket,

make

certain

that

allpins

are conectly

seated.

After

installing

the

chip,

check

for

pins

that

may

be

bent

or

not firmly

seated

in

the

socket.

lf

there

is

a

bent

pin,

remove

the

chip,

caretully

straighten

the

pin

and

reinstall

the

chiP.

E-1

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