Sharp Pc-1285 Assembly instructions

Table of contents

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This document has been published to be

used for after sales service only.

The

contents are subject to change without

notice.

RAMcard

CE-21

OM

(2KB)

CE-211

M

(4KB)

CE-212M (8KB)

CE-2H16M (16KB)

CE-2H32M (32KB)

SHARP CORPORATION

CE-140F pocket

disk drive

CE-126Pprinter and

cassette

inter

f

ace

eg DODOO

DODOO

CJDCJD DODOO

DODD DODOO

•CJCJ ODDO

CE-124cassette

interface

,

..__I

_ ___.

PC-1285pocket computer

CE-120P

Printerwith

Cassette interface

Dot matrix liquid crystal display (2-line 24-

digits)

8-bit CMOS CPU

Calculation capacity: 12digits

Calculator functions: Add, subtract, multip-

ly, divide, constant, percentage, add-on,

discount, power raising, reciprocation,

memorycalculation, etc.

6VDC, lithium battery cells (CR2032x 2)

0.03W

Approx

.

120 hours of continuous use (with

CE-212M) under normal conditions

(based on

1

O

minutes of arithmetic opera-

tion or program execution and 50 minutes

of display per hour at a temperature of

2o·c).

Life may vary depending on the operating

conditions and the type of battery used.

o·cto4o·c

135(W) x

141

(D) x 9.6(H)mm (opened)

135(W) x 70.5(D) x 19.2(H)mm (closed)

1759 (batteries included)

(APPLICATIONONLY)

Weight:

Operating temperature:

Dimensions:

Powersupply:

Powerconsumption:

Battery life:

Math operations:

CPU:

Display:

POCKET COMPUTER

MODEL PC-1285

CODE: OOZPC1285SM/E

CE

-

127R microcassette

tape recorder

CE

-

152 cassette

tape recorder

System diagram

PC-1285

Model:

2. SPECIFICATIONS

The PC-1285

is

an application only version of the PC-1280which has

a

simila

r circuitries and functions as those of PC-1280.While the

PC

-

1280 has an internal 8KB RAM, the PC-1285

is

not and may not

operate without a RAM

card

.

An internal RAM backup battery and an

internal RAM protect switch are therefore not used

in

the PC-1285.

1.

INTRODUCTION

Keyboard layout

SERVICE

MANUAL

SHARP -

PC-1285

,..

.

-2-

E

O

co

o

8000

4000

2800

20

00

I

n

ternal

RO

M

BK

B

DI

SP

& port

I

S

ystem

RO

M

I I

1

6

K

BX

8

BANK

I I

BANK

R

O

~

R

I

-

I

R 7

0

------

0

-

-----

0

----

-

A

OO

~-------

--+

D3 D2 DI

DO

0 0 0

K

S

I

0

K

S

8

I

K

S

!

-

KS

8

0000

38

00

Po

rt

wri

t

e

C

E

3A

O O

Port

w

r

ite C

E

3

C

OO

Memory map

3EOO

Key stroke

w

r

ite

CE

4000

3600

RAM bank add

r

ess

ROM bank

C

E

3400

3 2

O O

Caution PON latch

wr

i

te

CE

3 0 0

O

Low batt

e

ry

l

atch

C

E

conv

e

rsion

2EOO

G

.

APOB

2COO

D

o

~

o

PC-1470

U/

7

5

P

OB

~~~~~~~

I

P

C

-1280

A13sentonPOB

P

C

-1

285

D

I

SP

2

2A

O

Or--

-

--_,

P

O

I

P

0

2

P03

L===

:'..

P04

D

I

S

P

I

P05

P06

P07

~---

-

POB

2800~-

--

....,

5

.

MEMORY MAP

A

p

rog

ram

creat

e

d on the

p

ro

g

r

a

mma

ble

uni

t can be loaded

ont

o

the

PC-12

85 in

eit

her

o

f

th

e

fo

ll

ow

i

n

g

wa

y

s

:

(1)

U

s

ing

th

e

progr

a

m

st

o

r

ed

RA

M card

(

2

)

To

l

o

a

d

prog

r

a

m fr

o

m

t

he

c

assett

e

tap

e or

m

icr

o

c

a

ssette

tape

.

I

n

t

h

i

s

ca

se

,

the

foll

ow

i

ng

op

ti

on

G)

and

®

a

r

e

requ

ired

.

G)

C

E

-

126

P

p

rin

ter

/

cassette

i

n

t

erface

o

r

CE-1

24

cassett

e

i

n

ter

-

face

®

CE

-1

52

cassett

e

tape recorder

o

r

C

E

-

1

2

7

R

m

i

c

roc

as

sette

ta

pe

reco

r

der

(

3

)

To load

p

r

ogra

m

f

r

om the

2

.

5

"

pocket

d

isk.

I

n

thi

s

ca

s

e

,

t

he

fol

-

lowing option

i

s

requ

i

red

.

CE

-

140F (pocket

d

i

sk drive)

(4) To load program directly from another pocket

comput

er.

In

th

is

case

,

the following cable

opt

i

on

i

s

required.

EA

-

128C

NOTE:

Note the following when loading the RAM card

w

i

th the program

created or

ed

i

ted on the

PC

-

1280

.

(

1

)

Set the PC-1280

i

n

the

MEM$=

"

1

"

when creating or

ed

i

ting the

program

.

(Execute SETMEM "1"

I

ENTER

I

.)

(2) Erase reserve data by

PC

-

1280 before

load

i

ng to PC-1285.

Do the following operation to erase

.

ISHIFTI IBASICI

.

..

Set

in

the reserve mode (RSV symbol on)

[HJ~

&YI

IENTERI

...

Erasereserve

data

.

4.

L

OADING PROGRAM

The above values are at the room temperature of

2o

·

c

and may vary

depending on conditions.

(NOTE) Current

sh

ou

ld be measured

w

i

th a RAMcard loaded.

45µA max.

450µA

max

.

Cur

r

ent consumption when

PC

-

1285 OFF

Current consumption when

PC

-

1285 ON

(

w

i

t

h d

i

splay on)

Current consumption

Term

i

nal

voltage:

6

.

0V

Capacity

:

170mAH

PC-1285 power Lithium battery

supply CR-2032 x

2

pcs

3. BATTERY LIFE AND CURRENT

CONSUMPTION

..

PC

-

1285

8

XIN

I

n

Cassette signal

i

n

p

ut

9

XON In

ON

/

BRK key

input

,

normally

pu

ll

ed

down low.

10 XO

U

T Out

Cassett

e

signa

l

a

nd

buzzer

s

i

gna

l

o

u

tput

1 1

DIS

O

u

t

L

CD

d

ri

ver

con

t

ro

l

s

i

g

n

a

l,

high

du

rin

g

disp

l

ay

i

ng

1

2

HA

Ou

t LCD

dr

iv

er

sync

c

l

o

c

k

1

3

IA8

In/

Out Key

inpu

t/

key strobe

14 IA7

In

/

Out Key

inpu

t/

key

s

t

robe, low

d

uri

ng

I

I I

standby

I

20

IA1

In/Out Key

i

nput/key strobe, low

du

ri

ng

standby

21

IB8

-

Not used

22 IB7

-

Not used

23 IB6

-

Not used

24

I

B5

In

11

pin ACK

(acknowled

ge

o

n

1

i

nterface)

25

I

B4

I

n

t

-

pin DIN (data

i

nput on

t

-

i

nterface

)

26

183

In

t

-

pin DOUT (data

inpu

t on t

t

-

p

in

t

erface

)

27

I

B2

In

t

-

pin 102(data

i

np

u

t on t

t-

interf

a

ce)

28

IB1

In

t t-pl

n

101

(

d

ata input on

1

1-

in

te

rf

a

c

e

)

29

V

M

In

L

CD

d

riv

e

powe

r

30

V

A In

L

CD

d

rive power

31

GND

I

n

(

+

)

s

u

pp

ly

32

H

1

O

ut

L

CD

b

ack

p

l

a

t

e

signal, 4-level pulse

I I

I

d

ur

in

g

di

splay

i

ng

(1

/

14 duty)

I

45 H14 Out LCD

backp

l

ate

signal

,

4-level pulse

du

r

ing displaying

(1

/

14 duty)

46,47

H

1

5

,H16

-

N

o

t used (because

o

f

1

/14 duty)

48 VB

In

LCD

dr

i

ve

p

ower

,

hi

gh

d

uring

standby

49 VD

I

S

In

LCD drive

power

,

h

i

gh during

standby

50

vcc

I

n

LCD

d

ri

ve

p

ower

,

h

i

gh

du

r

i

ng

standby

51

voe

Ou

t LCD

dr

i

v

e

power

,

hi

gh

durin

g

standby

52

V

GG

In

(-)s

upp

l

y

53

08

In/

Out Databus

07

,

norma

ll

y

h

i

gh

I

i

mpedance

I

60

0

1

In

/

O

ut

Dat

a bus

DO

,

no

rm

a

lly high

im

peda

nc

e

6

1

F0

5

O

u

t

Ga

te

a

rr

ay

ch

i

p

enable (CF)

62

F

0

4

Ou

t

R

OM

c

h

ip

enab

l

e

6

3

F

03

O

ut

R

AM

ca

r

d

bank

se

l

ect

(

BA

)

6

4 F02

-

Not

u

se

d

6

5

F

0

1

O

ut

Lo

w battery

d

et

ect

,

h

i

gh

im

p

e

danc

e

d

ur

i

ng

s

t

andby

66

B08

Ou

t

Add

r

e

ss

bus A

15

,

h

i

g

h

durin

g

I I I

st

a

n

dby

I

7

3

B0

1

O

u

t Address bus A

15

,

high

duri

n

g

sta

n

dby

7

4

A08

O

ut Addressbus A

15

,

highduring

I I I

standby

I

80

A02

Out Address bus A1, highduring standby

-

PC-12

85

-3

-

Pin Signal

I

n/

O

ut Description

(

Standby-power off)

No

.

name

1

A01

O

u

t

Address

bu

s

A

O,

h

i

g

h

du

ri

ng

st

andby

2

Rfiii

O

u

t

Wr

i

t

e

c

l

ock

,

no

r

ma

ll

y

h

i

gh

3

cp

AL Out Address

la

t

ch

.

C

l

oc

k

u

sed

t

o

la

tc

h

t

he

a

ddress of the LCD

d

ri

v

e

r.

4

T

ES

I

n

Test pin, normally

l

ow

5

cp1

In Oscillator input

6

cpo

Out Oscillator output

7 RES

I

n

Reset

input

,

resetwith a high

sta

t

e

of

s

i

gnal.

7

-

1

.

CPU (SC61860A38)

7. LSI SIGNAL DESCRIPTION

[Fi

g

.

3

]

Q

b.._

_

L_

_

~

L_ _

___L_.,

_

Act

i

on

o

f the

vo

l

tage

de

te

ct

IC

[Fi

g.2]

~

Cl)

_

CAU

sig

n

a

l

lev

e

l

Ol

~

-+

- -

--

STO

Ps

i

g

n

a

l

;:,

S

ymbol ON

le

vel

a.

Cl.

L__ _

::J

(J)

2

.

0V

-

O<-

-~-~~-

---t--+

-'P

OUT

(

V

)

GA

CA

U

------'

(N-chopen)

R2

CPU

F

Oi

(P

-

ch

open)'!--

---

~

RI

[Fi

g

.1]

D

I

!

As

t

he

PC

-

1285

i

s

p

r

ovid

e

d with a low battery detect circuit

li

k

e

t

he

PC

-1

280

,

t

hi

s

sec

ti

o

n

de

s

c

ri

b

e

s about

it

s

f

u

n

ctio

n.

(

Note that the parts

l

ocat

i

on num

be

rs do

no

t always

co

i

ncide with

th

o

se

in

th

e

ac

tu

a

l

c

ircu

i

t

d

i

agram

.)

A

s shown

i

n

t

he

figur

e

be

l

ow

,

t

he

output from the low

batte

ry

de

t

ect

IC

,

LB

I

C (MN1280)turns

h

i

gh when the input voltage VIN

r

i

ses above

the detect

vol

t

age level VD, or turns to

l

ow when VIN drops below

VD.

For

bo

t

h

s

i

gnal

le

v

e

l

s of CAU and STOP are

mo

n

itored by a single

IC

,

LBIC

(MN1280

),

the

p

i

n

2 input

i

s divided by

R1

and

R2

,

and R2

is

tu

rned on and off with

ga

t

e

array CAU

.

As

F

i

g.3

shows

,

when

t

he

supp

l

y voltage goes below

t

he

l

eve

l

of the

CAU

s

i

gnal

,

the BATT symbol

i

s

se

t

act

i

ve

.

When

i

t goes

fu

rt

he

r

down below the

leve

l

of the

signa

l

STOP

,

the symbol

i

s turned

off

.

To

chec

k the level of the signal CAU,

t

he state of

th

e

line LB is

i

nter

-

r

oga

t

ed by

sett

i

ng CAU

l

ow (active

).

I

f LB

i

s

a

t a low level, the

s

y

mbo

l

is

act

i

vated

.

After sensing the CAN level, the CAN line is set off

(h

i

g

h

impedance)

.

When CAU is turned

off

,

the output changes from low to

high as the voltage on pin 2

i

ncreases as there is no more

r

es

i

stance

d

i

v

i

s

i

on. As LB is interrogated again,

t

he levelof STOP

i

s

sensed

.

In

the standby mode,

F01

of

t

he CPU and CAU of the gate array are

set high impedance.

011

is employed to compensate for a battery

voltage drop between the standby and

ope

r

ating

.

Upon detection of

the STOP

level

,

bo

th the

ON/

B

RK key and the

RES

E

T switch are

dis

-

abled.

6. LOW BATTERY

D

ETECT CIRCUIT

1.

A

s s

h

ow

n

i

n

the

fi

gu

r

e

above

,

i

nsert

yo

u

r

na

il

i

n

t

he clearance

be

-

tween CAB-A and

CAB

-

C near the

h

inge and push

i

t down

i

n

the

a

r

row dire

c

tion to disengage the latch C at two locations

(Fig

.

2

).

1

.

Eng

a

ge

t

he

la

t

ch

A

,

Fig

.

2

,

as shown

i

n

Fig.

1

G)

2. Engage the latch

B,

Fig.2.

3

.

Engag

e

the latch

C

,

F

i

g

.

2

,

as shown

i

n

Fig.1®

How

to

remove CAB-A

[

F

i

g.2]

L

at

ch

B

[F

i

g

.1

]

®

/~=::::::::::::::=::::::::::::::~~

~==~~~~~

=

~

I

C

AB-B

CAB-A

8-1.Rem

o

val

an

d

in

stallati

on

of

C

A

B-

A

Hintsto

latch CAB-A

with

CA

B

-

B

CA

B

-

A

C

AB-D

Each

cab

i

net

i

s

calle

d as

follows

:

D

isplay

sid

e

bottom

c

ab

inet:

C

A

B

-

A

Displaysidetop

c

a

b

in

e

t: CA

B

-B

Keyboardside bottom

c

ab

in

e

t:

CA

B-C

Keyb

o

ard

s

ide top

c

ab

i

n

et:

C

A

B-

D

8. SERVICE PRECAUTIONS

-

4-

P

i

n

S

i

gna

l

In/

Ou

t

D

escri

p

t

io

n

No

.

n

ame

1

BA

In

Ban

k

selec

t

2 CE

I

n

C

h

ip enable

3

D

C

O

In

D

a

ta bus

I

I I

I

6

D03 In

D

ata bus

(

7

GND In

(

-

)supply

8

P

0

1

Out 11-pin

101

(P-channe

l

open output)

9

P02

Out

11

-

pin 102

(P-channe

l

open output)

10

P

0

3 Out 11-pin DOUT (P-channel

op

en

output)

11

P04

Out

11

-

pin DIN

(P

-

channel open output)

1

2

P05

Out 11-pin BUSY

(

P-

channel open

output)

13

N

C

-

Not used

14 SLTB Out

N

o

t used

15 AS3B Out Not used

16 AS1

O

u

t System ROMA14 and RAM A

11

17 AS2 Out System ROMA15 and RAM A12

18 AS3 Out System ROMA16 and RAMA13

19 AF15 Out RAMcard slot

A

1

5

20 AF16 Out RAMcard A16

2

1

SLT1

O

ut RAMcard

s

l

ot chip

ena

ble

22 SLT2 Out InternalRAM chip

enab

l

e

23 DSP1 Out DISPCHIP1chip

en

able

24 DSP2 Out

DISPCH

I

P2 chip enab

l

e

25 RESO Out Resetoutput

t

o

CPU RESET

li

ne

,

normally low

26 KON

O

ut

ON

/

BRK

ou

t

pu

t

o

C

PU KON

l

in

e

,

n

orma

lly

l

ow

27 LB

In

Low

b

att

e

ry

de

tec

t,

l

ow at low

batte

ry

28 RES1

I

n

Reset

input

,

normally pulled down

29 BRK

In

ON

/

BR

K

k

ey

i

nput

,

normally pulled

down

30 Voo

In

(

+)s

u

pply

3

1

GND In

(-)supp

l

y

32 CAU Out Low battery symbol

act

i

vat

i

ng

voltage

det

e

ct

li

ne, high

i

mpedance

after

ac

ti

vation of

symbo

l.

33

KS

1

Out Key strobe

(

P

-

channel open

outpu

t)

I I I I

40 KS8 Out Key strobe

(

P-channel open

output

)

41

R/W

In

Write clock

42 A9

In

Add

r

ess

b

u

s

I

I I

48 A15 In

A

ddress bus

7

-2. Gate array (LZ92K41)

~

PC

-

1285

(Fig

.

3)

(5) Insta

ll

the

memo

r

y PWB unit

,

Fig

.

2

,

over the keysheet and insert

t

he FPC

term

i

na

l

onto the

gu

i

de

p

in

s on CAB-B.

NOTE

:

Do

no

t install the memory PWB

o

n

to the

g

u

ide pins

yet.

(

6) Install the mask

sheet

,

then the

fix

i

ng rubber on the

f

ace of the

cabine

t,

after which

fo

l

d back the ear of the FPC to fit it on

th

e

guide pin

(Fig

.

3

.

)

(7)

P

osi

tion the sealing

a

n

g

l

e

t

o the guide

pi

n

s

o

n

CAB-B

a

nd

secur

e

i

t

w

it

h

fou

r

sc

rews

.

N

OT

E:

Tig

ht

en the

t

w

o

in

ner

s

crew

s

fi

r

st,

t

h

en

tw

o

t

h

er

scre

w

s

.

G

uid

e

/

(Fig.2)

FPC

(Fi

g

.

1)

C

A

B

-

D

(

ke

y

b

oa

r

d

s

i

de

t

op

c

ab

inet)

Lower

h

alf

ke

y

sh

e

et

M

as

k sheet

..

PC

-

1285

-5-

8-4.

In

sta

llin

g

PWB

,

keysheet

,

etc

.

(1)

A

ss

em

b

l

e

t

he

ma

s

k sheet,

t

h

en

t

h

e

ma

i

n

PWBonto CAB

-

B

.

(2)

Inse

r

t the

ru

b

ber key in

C

A

B

-D

,

t

hen

inst

a

ll

t

he

upp

er

h

al

f

o

f the

ke

y

s

hee

t.

Pos

i

tio

n

t

h

e

s

hee

t onto the

gu

i

de

p

in

s and key

s

heet

ho

l

d

in

g

s

.

(3)

In

s

ert the key spacer by

pos

i

t

i

oning it to the guide pins.

(

4

)

Fold back the

low

e

r

half of the key sheet and fit the terminal onto

t

he guide

p

i

ns on

CAB

-B

.

NOTE:

A

t

th

i

s

point

,

the lower half of the key sheet should notyet be

on the guide pins or holding pins, and the fold line should be

left

loose

.

Knob

(?1 ll

Contact

Q;Y'

*

For the contact

is

secured on the knob at two

l

ocations, it has to be

i

nstalled on the location as in the

figure

.

8

-

3.

Ins

ta

lli

ng

t

h

e

c

ont

a

ct

to the

L

OCK s

w

i

t

ch

knob

o

nC

AB

-

D

~

/

/,?

(k

e

yboa

r

d

si

de

to

p

CAB

-

c

/

{(

c

abi

net)

/

H

ole

i

n

CAB

-

C

(key

boar

d

side

bott

o

m

c

abinet)

*

The

p

i

n

m

u

st be proper

l

y

a

n

d

firml

y

e

n

g

aged in the hole.

l

t

~J

Latch

~[

[

L

at

c

h

I

8-2.

Installing

CAB-C

*

Makesure that

t

h

e

p

i

n

i

s properly engaged

i

n

the hole.

*

W

he

n

l

atc

hi

ng

CAB

-

C

w

i

th CAB

-

D

,

pus

h

CAB

-

C

all

t

he way in

th

e

arr

owhead A to achieve

fi

rm engageme

n

t.

Us

e

the spec

i

al

tool to

tight

enthe

screws

.

2.

D

o the reverse sequence to remove the latches.

CAUTI

ON: When

r

emoving CAB

-

A

,

be

c

areful not to separate

t

he

sta

ti

c

t

ape.

8-10

.

Display

test

Items

req

ui

red for disp

l

ay

c

h

eck

:

•

PC-12

8

0

(for

p

r

ogram

entry

)

•

Half

-

size RAMcard (fortest)

•

PC-

1

285 to be tested

Th

e

contents of

bo

t

h

PC-1280 and the RAM card will be

l

os

t during

t

he

t

est.

(1)

Set

t

he RAM card in the PC-1280 and do ALL RESET.

(

2) Enter SETMEM"1"

[:;;D

.

8

-

9. Displayside cabinet and keyboard side

cabinet

These two cabinets are held together

wi

t

h

a spring

.

To replace

ei

ther

o

n

e only, it

may

be

po

s

sible to scrape the cabinet with

t

he

cut

-

te

r

a

nd

t

o

r

emove

t

he spring pin

w

it

h

a

pa

i

r of pliers

,

but the

,

once

pulle

d

out

,

cannot be

re-used

.

Le

n

gth PWB

un

it

J1

140

Ma

i

n

PWB

J2 105

J3

12

7

Mem

ory PWB

•

Pro

v

i

di

ng

j

umpe

r

~

I

.

8

~I

w

•

Pr

o

vide

t

he

f

o

ll

ow

i

ng

1

O O

Q

r

esisto

r.

• The capacitor

i

nserted to the 11-pin

connect

o

r must be installed in

the following

m

a

nner.

8-8

.

Hin

t

s and

tips

• Any

p

arts must be closely

a

ttached on the PWB with

so

l

de

r.

• When replacing

LSls

,

use the ALUMIT KR19RAM

solder

.

(See

Service

In

formation PS-009.)

• See the figure below for the

i

nstallation of a

0

.

1uF

in

sert

ed across

v

-

the KON (pin 26) of

th

e

ga

te

a

rray and the VGG

s

ide

o

f a

0

.

0

33uF.

-

6

-

The contents of the memory will be erased

w

i

th the

follow

i

ng proce-

dure.

(1) Insertthe RAM

ca

r

d

.

(2) Pressthe RESETsw

i

tch

.

(3) Pressthe YES key.

(Normally

,

the YES key may not be

pressed

,

but

t

he YES key ON prompt

may

appear depend

i

ng on

t

he

con

-

tents of the RAM

card

.

)

(4) Key in

[[)Gill:JGJ

.

(5)

Th

e display will show

0.5

5

555555555.

(

6

)

After leav

i

ng

th

e

un

i

t

in the above state for more than 14

m

i

nutes, check

th

a

t the power has been out.

8-7. Internal RAM

capacity

and auto-power

off

functionalchecks

8-6. Ground

continuity

check

Check that the resistance between the display side

cosmet

i

c

pane

l

and

t

he RAM card lid is not morethan 5 ohms

.

8-5.

R

e

plac

i

ng the

static

ta

p

e

The static

tape

,

once

sepa

rated from the

a

l

uminum

panel

,

should not

be used again. A new one must be

used

.

Wipe residual glue off the

pan

el before attaching a new static

tap

e

.

After the

replacement

,

check ground continuity in accordance with

8

-

6

.

(Fi

g

.

6

)

(

F

i

g

.

5

)

(8)

Sol

d

er the

bu

zze

r

l

ea

ds to the

dis

p

lay

-

side bottom cabinet (CAB-

A) as shown in Fig.4.

fasten the

term

i

nal lug of the

stat

i

c

t

ape with a tapping

s

crew

.

A

lso

s

c

rew the other

one

.

(Fig

.

5)

(9)

Latc

h

CA

B-

A

w

ith

CAB-

B

.

(10) Close the unit halfway (Fig.6)and install the lower

hal

f key sheet

and the memory PWB on CAB-D.

(11) InstallCAB-C.

(F

ig

.4)

-

PC

-

1285

Menu

(

RAM2

)

(

????H

-????H

IS

CHECKED)

I

ENTER

I

ERROR OCCURED AT

???

?

H

IENTERI

(RAM2)

XWAl'f'#.

(

RAM2

)

B:4K D:16K

A=2K c:aK J:32K

K:PASS

rxi

rm

17'1

IT'\!

rn

Refer to

lllh

W

h ~.

1.1.!1• l.SLJ

NOTE 3

.

(

RAMl)

(????H-????H

IS CHECHED)

IENTERI

NOTE 3: For PC-1285

,

enter

[IS]

to pass the test item

AM2.

NOTE 4: The RAM contents will be erased during the test. (To

preservethe

content

s

,

enter

[R]

to pass.

NOl

(

RAMI

)

ERROR

O

C

U

RED AT ????H

11·

QI

T

e

:

~

I

ENTER

I

(

RAM!)

X

WAl'f'#.

IA],

IB],

[CJ.

ID!

.

Q]

NO

(

2

)

D

:16K

C:

S

K

J:32K

K:PASS

[I]

M

e

n

u

Refer

to

NOTE

3

,

4

Details of test

item

s

(1) RAMtest

-

7-

NOTE

1

:

Power can

b

e

turne

d

o

ff only when the

abo

ve

men

u

is

on

the display.

N

O

TE

2:

If

the

t

e

st

p

r

o

gram fails

t

o st

art

,

checkthe

keybo

ar

d

first.

Pow

er

off

'-----

-+

(

P

ow

er

O

FF)

(

3

)

15-

p

in

t

est

(n

o

t

ne

c

e

ssary

f

o

r

P

C

-12

85

)

Enter

~

,_______

(

2

)

1

1-

p

i

n

test

Enter

[g)

Enter

[TI

,___

(1)

R

AM

t

e

st

I

(

MENU>

l

:

RAM

2

:;;

3

:

15PIN

IBllRJ

IIDITI

Turn power on while holding down the

following three keyssimultaneously.

(PowerOFF

A test program

is

contained in the ROM.

Test items

(

1)

RAM card read after write test

(

2)

11

-

p

i

n

connector 1/0 line test

(3) 15-pinconnector 1/0 line test

NOTE: The

i

tem (3)

is

not used for

PC

-

1285.

Tool required

The

PC

-

1360 special tool UKOGC3020CSZZ (price rank:

BC

)

is

u

sed

fo

r (2) and

(

3).

Description

The RAM contents will be erased in the progress of the test item

(1

)

.

N

ecessary program and data must be saved on on tape or other

dev

i

ce before starting the test.

9. CHECKING WITH THE TEST PROGRAM

10

:

"A"

2

0

:

WAIT20

30

:

BEEPl

3

5

:

IF INKEY$="0"THEN60

40:

P

RI

NT"8-8";

50

:

IF

INKEY$<

>

"0"THEN30

6

0

:

POKE&237c, 255,

2

55

7

0

:

P

O

KE&283c, 255, 255

80

:

GO

TO

80

(4) Turn power off the PC-1280

a

n

d

s

et

th

e

RAM card in the PC-

1285.

(5) Turn power on and press the

[Al

key

.

(6) Check

th

at the figure

"

8"

is

displayed in every digit on the first

row and the second row. Make

su

re

t

hat "8" on the

s

e

cond row

begin to disappear one by one.

(7) Pressthe

[Q]

key

.

(About

1

second)

(

8) Press the

I

ON

I

key

.

(9) PressthelOFFI key.

(

3

)

Enter the following

program

.

(

On the line 40

,

enter 23

d

i

g

its

o

f

"

8

".)

I

,

S56

-

S5

7

S58

S59

S60

10. LCDWIRING SCHEMATICS

-

PC

-

1285

-8-

NOTE2: No error will be found

i

f

the

r

e was a

sho

rt between

s

i

gna

l

lines

i

n

s

i

de

th

e

u

nit.

CD

XOUT-+XIN

®

101-+102

@

102-+101

©

DOUT-+DIN

@

DIN-+DOUT

<ID

BUSY-+ACK

U

C

N

C

M

I

3

0

7

CC

!

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Test tool t

t

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co

nnector

circuit

diag

ram

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p

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BU

S

Y

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N

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ll

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A

CK

10

2

1

0

1

NOTE

1:

The

te

s

t pins and the

te

s

t

seq

u

ence are shown next.

jENTERj

Menu

(

llPIN

)

CHECKED

jENTERi

(

llPIN

)

XOUT:HIGH

XIN

:

LOW

(

llPIN

)

"lf.W

AI

T"lf.

Me

n

u

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(2

)

11-pintest

F

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11

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p

i

n

connector of the

te

s

t

too

l,

with

t

he parts

s

i

de

f

ac

e

up

,

to the

t

t-

p

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connec

t

or on

t

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PC

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Sharp PC-1285 Assembly instructions

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