Sharp PC-1251, PC-1250 Service Manual

PC-1251

SHARP

SERVICE MANUAL

MODEL

CODE:

PC-12 PC

O

OZPC1251

-1250

///

E

51

1.

PRODUCTS

2. SPECIFICA

3. BLOCK DIAGRAM . . .

4. CPU

5. LCD DRI

6. SER VICE PR

7. SCHEMATICS 10

8. PARTS SIGNAL LAYOUT CHART

9. PARTS

*

Differen Program da

-t:<

CE-125 option Microcassette tape recorder thermal

ce

dot pr

INTERNAL BLOCK DIAGRAM AND PIN/SI

VE CIRCUIT

GUIDE AND PARTS LIST

between PC 1 2 ta

area

of the PC-1251 is

:

inter is in

OUTLIN

TIO

N

ECAUTIONS

50 and PC 1251:

is

available as an external me

corporate

d as the output

E

. . . . . . . . . . . . . . . . . . . . . . . .

AND TIMINGS . . . .

. . . . . . . . . . . . . . . . .

larger by 2048

bytes.

devi

. . . . . . . . . .

mory device and 2

ce.

. .

. . . . . . . .

GNAL DESC

. .

. . . .

. .

. . .

. .

3

RIPTION

. . . . . . . . . . .

. . . . . . . . . . . . . . . . 9

4-digit

. .

. . . 7

. .

4

11 1

2

SHARP

CORPORATION

1

.

iNTRODUCTiON TO

The

SHARP PC-1251

*

52-character keyboard.

*

24-character

*

Powerful BASIC in 24K ROM.

*

8 bit

CMOS processor.

*

4KB

RAM

*

Optional CE-125

system consists of:

display

.

Printer/Microcassette Recorder.

THE

2. SPECiFiCATiON

Model: PC-1251 Pocket Computer Processor: 8 Programming Memory Capacity:

Stack

:

Operators:

Numeric Precision: Editing Features: Memory Display: Keys:

Power Supply:

Power Consumption:

Operating Temperature: 0°C ~ 40°C (32°F ~ 104°F) Dimensions

Weight: Accessories Options

Language: BASIC

Protection

:

bit

CMOS CPU

ROM

RAM

System User

Fixed Memory Area

(A~ Z,

Reserve Area Program/Data Area

Sub-routine:

FOR-NEXT Function: Data

: Addition, inverse sion, square root, sign, absolute,

10 digits (mantissa) + 2 Cursor CMOS Battery backup 24 character 52 defined keys.

6.0 V DC Type: CR-

6.0 V

(Sufficient for

135 (W) x 70 (D) x 9. 5-5/16 Approximately Wallet, two

Printer/Micr

subtraction,

trigonometric functions, logarithmic and exponential functions, angle conver-

left

and right, line up and

keys: Alphabetic, numeric,

Lithium

2032

DC@0.03

11

(W) x 2-3/411(D)x3/8

ocassette Recorder

PC-1251

:

About

A$~

Z$)

10 stacks

:

liquid

lithium

5

stacks

16 stacks

8 stacks

multiplication,

digits (exponent)

crystal display

cells

W

approximately 300 hours

5 (H) mm

115 g (0.25 lbs) (with cells)

cells

(built-in), two

(RAM: 4 K)

integer, relational operators, logical

down, character insert, character

special

11

(H)

(CE-125)

24 K Bytes System

500 Bytes

208 Bytes

48 Bytes

3486 Bytes

division, exponentiation,

with

5 x 7 dot characters

symbols, and

usage

without

keyboard templates and instruction manual

functions. Numeric pad.

external power

trigonometric

operators

delete

.

supply

and

.

Use

r

. )

•KEY LAYOUT

Key board

Display

Reserve

/

Conditioning key

section

Power /Mode slide s

witch

.

•SYSTEM LAYOUT

O

PTiON CE-1

MiCRO C

ASS

ETTE REC

:cAssETT-E:

~ci~-~~i1:~--1

: Co

ntrol

ler

1

----

---

- - ----- REMOT

DIDO

OFF ON

UM-3 Type

NicdX4

11Pin

25

I

:

..

E

ROLL PAP

24 Dig it THERMAL

OFF

0

: 2/4 K

: By

..

R

AM

PRINTER

PRiNTER

llilI[J

:

te

:

_

P C-1250I

ER

I

ON

24 DiG L

System

: 16K : Byte

1251

CD

ROM CPU

: :

NOTE:

Standard cassette tape recorder can

Recording

to

the standard cassette tape

SP

Lithium cel

/

s:

<,

I

..

__

'

X2

,,..

ls

'

only

AC

Adaptor

STANDARD C

be

used

to write

is

not

possible

.

data

ASS

ETTE RECORDE

to

the computer via the CE-

R

125

.

2

3.

PC-1250 / PC-1251

SYSTEM

BLOCK DiAGRAM

~-G ...

T ..

. . . ....

~~

~

V

GG

,KEY M

(

51 KE

B

UZZ

. .

....

N_D

+

z~

-

V

CJ

~

-

--.

.....--1A1

Slide Switch

ER

.

.L

.r,

dT

....

(OPTiON) CE-125

V

GG

3'

!

__ vcc v

oc

GG

SC61860

SC618

TEST RES

ET

- KON

I

r+ IA

s

I

B1

ATR

iX

Y+ ON KEY

c:::i

Y.~:0

Vots

C.P.U.

o

60 A02LD

-IB4 Xo

)

IY

1

Vs VM

A02

r

Xi

• . .

VA

H

D

R/W~---

¢AL>-------+.-...._--+l--~------t--

01-0s •

AO 1-3 B01-1~=

I

IBs IB1 FOu IB5 IB

Se SeiZ Din Dou

L':::::

3

11 V\cK BUSY

.

1')..

.

4

~

' ~

~

VGG-

A

IS

...__ _ __._..,DiS

LCD 24Dig +

VA

Vs

Vrns

SC43536LD

-

HA

C

BOs

SC

E

PAL R/

J

4 3 5

or

I

?symbols

36

W

01-

s

--+--+-_._--1-1---------,,.........----~

-

---~

DATA BUS

l

~=====l==::::;::;:=:#:======t===n=fj=~=

B03,F01

====

t

====

-3

=l==;:;:il:=:#:======t==n::::fl=fj=~

=:!==l:l:::li==J~====;==r=t==fAF~:::>~

F0

5

ROM

16KBYte

LH532916

.

F03 I

'

~

C

E

R/W

CE RAM

2KBy

HM61 1

or

CTC5517)

RAM 2Kbyte

PC1251 Only

Ao-

10.

01-8

te

6

I

)

ADDRESS BUS

CHiP E

NABL

E

'

MiCRO CASS

MiCRO CASSETTE

tape recorde

CiRCUi

M

-13H

ETTE

T

remot

e

THER

r

PCU

SC6858

MAL PRi

MTP 201-24BA

NTE

R

3

4. C.P.U.iNTERNAL

BLOCK DiAGRAM

TERMiNAL DESCRiPTiONS

&

• C.P.U.

(SC61860A02) ········· 8 Bits C-MOS C.P.U.

ROM (

BK Byte)

I

,

1

DO

07

Hg-15

I

B

•

!

•CPU pin No.

Pin Signal No.

10 11 12

name

1

A01 OUT

2

3 4

5

6

7

8

R/W OUT 0AL TES

01

00

RES

Xin

9 ON IN

Xout

Dis

HA

xLh:~.

¢

AL

R/W F01 F01 F03 F04 FO;

Addre

ss

Latch

and si

I

N/OUT

Address Write clock, normally

OUT

Low order bits address latch, normally hi

address signal on the data bus line

Test pin, normally

IN

Oscillator input

IN

.

CCE)(CEJCCE)

F01 · 11F

Out

Por

F02 : !IF

FOi .

RAM FO, F

O; . PROGRAM ROM CE

gnal description

t

Out Port

Basic

RAM

GRAOEUP

RAM

bus, high during standby

low

.

s

Description (Standby = power

.

high

.

gh. The clock used

when a larae caoacltv ROM is

.

to

off)

latch

used.

U

181

-B

110 PORT

1-4

KEY

5-8 for

low

order 8 bits

j

OUT TERMINAL INTER FACE

OUT Oscillator output.

Reset input, active high.

IN IN Input (MT in)

of

microcassette signal from the CE-125 option.

Normally, pulled down to low level.

ON (BREAK) key input, normally pulled down to low level. OUT Output (MT out OUT

LCD dri

ver

1)

of mi

crocassette signal to the CE-125 option and the buzzer.

control signal.

OUT LCD driver clock, low during standby and in 2 kHz oscillation during display.

of

16-bit

4

No

1

3

14

.

Si

gna

l

name

i

A8

i

A7 IN

IN/OUT IN/OUT

/OU

T

Key input/strobe signal, l Key

input/strobe signal, l

Description (

Standby = power ow during standby and key-in ow during st

andby and key-in pulse

off

)

pulse

is

genera

ted when

is

generated when

low low

.

. 15 16 iA5 17 18

IN/

i

A6

IN/OUT IN/OUT Key input

i

A4 i

A3

IN/OUT

OUT

Key input/strobe si Key input

Key input/strobe

/strobe /strobe si

gnal, low during standby and

signal , l

ow during

gnal

, l

ow duri

signal, low duri

19 iA2 IN/OUT Key input/strobe signal, low

20 iA1 21 22 23 iB6 24 25 26 iB3 27 28 29 VM IN 30

31

GND IN

32

33 H2

3

4 H3 OUT 35 36 37 38 H7 OUT 39

40 41 42 43 44 45 46 H15 47

48 49

VD i

50

IN/OUT Key input/strobe sig iB8 IN i

B7 IN

OUT

i

B5 OUT

iB4

OU

iB

2

OUT

iB

1

OUT

ACK Data in SEL2 output, P-type open drain. S

EL 1 output, P-type open

I

N

S

lide switch input.

Key strobe output,

T

Key strobe Key strobe LCD power supply L

VA

IN

CD

Powe

H1

OUT O

H4 H

OUT

5

OUT

H6 OUT

H8 OUT

H9 H10 H 11 H12 H13 H14

OU OU O OUT OU OU

--

H16

Vs

Vee

-

s

LC

L

UT

CD

LCD

T

LCD

T

LC

LCD

T

LCD

T

LCD

Not used. (D

-

Not used. (Display

L

I

N IN IN

CD power

LCD pow

LCD power supply,

D

nal, low duri

signal

that en

ables the CPU

(Din). Ser

ial data input fr

low output, low outpu

t,

low during standby and

during during standb

.

powe

r supply

.

r supply.

back

plate

bac

kplate sign

b

ackp

late

bac

kplate

b

ackplate si

backpla

te signal,

backplate signal,

backplate

backplate backplate signal backplate backplate signal, high impedance

backplate

isplay

signal

al, signal signal,

gnal

signal, signal, signal

signal

high

,

hi high

,

high high

,

high high high high high

,

hi

,

high

,

high

,

of this

gh

of this unit opera

supply, high during

er supply, high du

normally

key-in pulse

standby and key

ng

standby and key-in pulse

ng standby and -key-in pulse is

during standby and

ng

standby and key-in pulse

to re

ad

data through

om PCU

drain

.

standby and

key-in

(bit

by

bit serial handshake).

key-in pulse

y and key-in pulse

key-in pulse

i

mpedance

i

mpedance impedance impedance i

mpedan i

mpedance imp

edance during standby and 4-l impedance impedanc impedance impedanc impedanc

impedance du

unit op

ring stan

duri

ng standby 'and 4-

during

standby during standby and during standby

ce during

e

erat

tes in 1/

standby a

standby and duri

ng

sta

duri

ng

standby during standby and during

standby and 4-l

during standby

during

stand

during

sta

ring

standby

es in 1/14

14

nd low when the high level clock

dby and low when the

low

.

ndby

by and 4-level pulse

ndby and 4-le

duty. duty.)

is generate

-in pulse

is

ge nerated when

is

generat genera

pulse

is

ge n

era

is

generated w

1/0 port

(

PCU).

is

gen

erated is generated when is generated when

level pulse

and 4-level

and 4-l

and 4-level

pulse dur

4-level pulse during display

puls

e

4-level pulse

evel pulse evel pulse evel pulse du

4-level pulse du

evel pulse evel pulse

vel pulse

pulse during

)

high level cloc

d when low

low

ed wh

en low.

ted when low.

ted when low

hen low.

when

low

.

low

.

low

.

during display

ing

dis

play

during dis during display during display during di

duri during during during displa

ring ring

ng

display. display dis dis display

display.

stops

play

spla

play play.

.

k stops.

.

. .

y.

.

y.

5

Pin Signal

No

51 52 53 54 55 56 57 58 59

name

.

Voe VGG

08

07

06 05 04 03

02 60 01 61 62 63

Fo5 OUT Fo4 OUT Fo3 OUT

IN/OUT

OUT

IN

IN/OUT IN/OUT IN/OUT IN/OUT IN/OUT IN/OUT IN/OUT IN/OUT

Description (Standby = power

LCD power supply, high during st

andby and low when the high Power supply normally low. Data

bus, normally high

impedance

. Data bus, normally high impedance. Data bus, normally high Data bus, normally high

impedance impedance

.

. Data bus, normally high impedance. Data

bus, normally high Data bus, normally hi Data bus, normally high

impedance

gh

impedance. impedance

.

. External system ROM chip enable (CE1). Expansion RAM Basic RAM

(PC· 1251 RAM) chip enable

(PC-1250, PC-125

1)

chip enable (CE3).

(CE2)

off)

level

clock

stops

.

64

Fo2 OUT Data out

65 Fo1 OUT

66 67

Bo8 OUT

Bo7 OUT 68 Bo6 OUT 69 Bo5 OUT 70 Bo4 OUT 71

72

73

Bo3 OUT

Bo2 OUT

Bo1 OUT AS. 74 Ao8 OUT 75 Ao7 OUT 76 Ao6 OUT 77 Ao5 OUT 78 Ao4 OUT 79 Ao3 OUT 80

Ao2 OUT

(Dout), data

BUSH l/F output

output port

port output.

LCD driver LSI chip enable (CE4).

A 14.

Address bus, hi A13. Address A 12.

Address bus, hi A 11.

Address A 10.

Address bus, high

Address

A9.

Address

A7

.

Address bus, high

A6

.

Address

A5

.

Address bus, high

A4

.

Address

A3

.

Address

A2

.

Address bus, high during standby.

A

1.

gh

during st

bus, high

duri

ng

gh

during standby

standby

bus, high during standby.

during

standby bus, high bus, high bus, high during

bus, high

during duri

ng

during during during

standby

standby.

standby

standby.

standby bus, high during standby. bus, high dur

ing standby.

to per

andby

ipheral.

.

6

5.

LCD

DRiVE

CiRCUiT

AND

TiMiNGS

•LCD

Driver LSi

GND

1·-

- --- -9---?-

:

¢AL

~-

-

--·-

- - - -

V

GG

~-

l--

--

-

. .

(SC4353

DIS HA

6)

~

----'

--~

64 by

te

) (00-3F

)

.

-

-- --

64 byte

DISPLAY

S63

------------

M M

(40-7F

(

RAM FOR

-+--(-S6~2)---i-~S6~1_____, (S63

Read/Write

· -

--·---

-

LCD display screen of 24 digits

Vtns

V

A

.

~

:

Qj ):

0

:

~

.

)

c

•

<l)

•

E

:

)

Ol

<l)

~

- -

-·

80P

in

sections,

signal from the first are used for the teenth

L

CD

H 1 - H 7

digit

to the twenty-fourth

is

operated

in

are used for the backplate

to

twelveth digits. H8 - H

backplate si

1/14

duty.

is

divided into two

gnal from

digit.

Thus, the

the

thir

14

-

• LCD timing ch a rt

Disp

lay out

bis

HA

GND-VAH

VMH-

VBH

-

f

V

DiS

l

/

I

3

-

5\

DiS

Vot;s/5

*

VAL

-

t

vo.

s

~v .

5

DIS

s

1

VM

VDis·VsL

-5-

L

- t

voi

- T

Power ott

(CPU standby)

Retains the oft . atate

~

'---

(Mote

)

vois

(EX

AMPLE

- av

- -1.4V

- -2.BV

-

-4.2

V

..,_ -5.6V

- -7.0V =7.0V

.)

.

Lt:

RES

ET ON

Display

on

-

5

-

·

-

VA

VM

VB

7

•LCD

r------

POWER

-

--l

SUPPLY

Vee

V

oe

L

VDiS

VGG (About

CD CONTRAST

6V)

CONTOL

S

1

CP

U

•COUNTER

H

A

DiS

RE

S

h 1CTR1)

h

2CTR2) -- - ----

h 3(TR3)

h 4(TR4

)

h

5(TR5)

--l

SECTiSN

------------------

- -------

Vs

LC

V

M

I

1

VA

&

- - ---

--

- -

---

- ---

----.

D

DRiVER

Segment

(

s

62

terminal

waveform

LJ

Segme

GND=

VAH

V

vrns=vsr

nt

Termi

-

MH -.-------------- -

_.

all OFF (DiS=L) D

isplay

Display OFF

nal

w

aveform

- - - - -----

-

a

l l

OFF

ON

B

ack plate (H1) wavefor

ON ON ON

ON OFF OFF OFF OFF OFF

h5=0

VAL V

BL

VAH

8

h5=1

V

BH VA VBH

OFF ON ON

H

ON ON ON ON

ON ON OFF

6. SERViCE PRECAUTiONS

1.

Since it you use shooting purposes

is

difficult to troubleshoot the

the

service tool

chassis (LCHSS1134CCZZ) which

only. When

unit

main PWB because of chassis

is

repaired, replace with original chassis.

mounted

smaller in size. Install this chassis

on

top

of it, it

is

suggested

for trouble-

that

2. When

3. If

4. Consumption

5. Checking display

the

memory module PWB could be installed slightly to the

play in

l

ead

to again and press resuming

the

lithum

with good electrical

flickering display or result.

o

Supply voltage: 5.8 V

o

Consumption 400 ON key). 45

µA

OFF key).

Be sure

before

meter

.

the

improper

operation.

battery

Be

sure

current

µA

max. when ON (after pushing of

max. when OFF (a

to

the

measurement

is

out of

alignment due

screw

holes. Since this could

operation, replace

the

ALL RESET switch befor

is

not

installed properly and

contact

damage

the battery

measurement

current

press

the

quality and adjusting

problems such as

to other

is

properly installed.

:

fter pushing of

ALL RESET swi

.

replaced it

the

PWB

parts could

the

tch

potentio

-

~'"''

e

:

Not

e

:

No

~

'

to

blur

at 30°.

irregular contrast

at 10°.

9

7

.

LF-

CiRCU

81256E

s

s1 s1s s l s l s sis slsls

3 4 5 u 12113114 15

iT

(

24

I

l

Di AGRAM

Dig 5X7

DOT

islslslsl

21

?.212312412513

MATR

iX

s sis

1

~1331343514

s

1

2j43~f45146

l s l s l

Bsvmbols )

s ] s

sls !s] s s

7\4

814

9150

sl

sls l s

51

52l53154J~56l57ffi

l sl

s s l s

js l s

sJslsls

1142141 35j

s l s

ls

l

s ] s s sis

34J33l3~12 2412

sis s sis

3221211514

I

l

I

"

1

I

<!

12

II

.......

1 I

,\

b

s

SISIH ",l"I"

2 I 14 13

3

00

I

s s

sis

5 4

13

12111

-

Addre

ss Bus

Data Bus

--l

•

Segment

ti--

t

-

----

-

,---

:::::::

,.--

,,.- 0

,.--

-

---F

--1

_~~~

_.';!

.'!_

~

c

~

1

~

(

:£<

F

-

'"F

-

l

+IGND

(

-) VGG

r---

--tt-----

~

----------- .....

------------ri

I I

I

I I

I

j

I I

I

'1

11'---

'------f

- ~

-

.E!_

1- ~ ~

I'--

r---

~

r--- Al

.__

T

I I

I

•

s

2K By

HM611

or

T

C5517

RA

6

te

M

A4

:T

5 20 ~{;

- F04 - F03 r---

"'AO

......

..i

Oi

~

10

~

G

ND 12

1-'i

: I

I I ~

-

-~C_!_2~1_9~

'=._Y

24.YQ.Q_

t--

A9

l----+--~1--+--v

E

l.

..IT_

0

:2L

1

5~

o

s

13 04

..........

-+-it--

I

I I

I

1

I

ii

j

-..

---------

.....

-------

---4

...+.-t----+--it---..-------

11

- ~ -

·--

g_

I

~

-~-~

~

-----

----- ~~

--------~

..___

~

_

l

2K Byte

~

5

HM6116 1<.b,_CEE"t-.,.:.:~+--

~

~ 10

TC5517

~

..§.!!_Q

12

rrt, ..-J- - ........... --.- ...........................

or

24

...Y.QQ.

~ r++ur,

~

t----+--+-il-

~ ~

E'!!.

-

20

ffo-

RAM

-

0

Q?

i----+---1111

15~

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H532916

5

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6 ~ ~ ~

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V

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SC61860A02

( SC6 I 860A02LD)

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t SW IOO

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B5

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signal name

Side

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V

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Busy

0 in

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MT

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OPTION INTERFACE

11PIN CONNECTOR

10

8. PARTS

&

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11

12

13

P

ART

R

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B

c

B

c

B B

c c c

c

c c

B

B B

c

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c c c

c

c c

E E

c

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RESET

F.P.C

TERMiNAL FOR

UZZ

ER

C

APACiTOR (CHiP)

CAPACiTOR (CHiP) 1

C

APACiTOR (C CAPACiTOR 0. 1µF 12V C

APACi

TOR 1 µF 6.3V

C

APACiTOR

PARTS NEME

SWiTCH

HiP) 0.01

3

.3µF 1 O

X'tal

VARi

ABLE TRAN RE

SiS CAPACiTOR C

APACiTO

DE 1 S1

Z

ENER Di LSi LSi (OR VHiSC6186

RESiSTOR (CHiP) 1 OOKD RESiSTOR (CHiP) 1 MD

RESiSTOR (CHiP) 22!1 RE

SiS

RESiSTOR (CHiP) 56K!1

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MEMORY MOD

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si

L

si

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(L5,L6)

81

2

V

iT FOR PC1251

NE

No.

43 QCNW-1236CCZZ

-

~

66

-

'---

~

PARTS CODE QCNCW1306CC1B QCNTM1051CCZZ

QTANZ1289CCZZ

RALMB1030CCZZ RC-CZ1021CCN1 RC-CZ1035CCN1 RC-CZ1037CCN1

RC-CZlOOOQCZZ

RC-SZ1007CCZZ

RC-SZ1021CCZZ

RCRSZ1046CCZZ RVR-Z2400QCZZ RH-i

X1012CCNl

RR-KZ1050CCN1

VCKYPU1HB101K VCTYPU1EX333M VHDDS1588L2

VHERD 6. 2E8 /-1 VHiSC43536

VH i SC6 l 860A02 VRS-TP2BD104J VRS-TP2BD105J

VRS-TP2BD220J

VRS-TP2BD472J VRS-TP2BD563J VVLLF8126E

DUNTK6915CCZZ DUNTK6917CCZZ MSPRC1207CCZZ

VHiLH532916

VHiTC5517AF

/-

1

/-

-

PRiC RANK

AK AB

A

C

A

B

AD

AB

A A AB

AF AC A A A AA

AA

AB

-

1

A

D AC A

X

BE

AA

AA A

A

l

A

Y

AB

l

-

AZ

1

BE

W

E

MARK

N

B B

N

E

N

F C

N N

N N N

-g'D

OvtvTk

- 'q

1

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15

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p

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l l-

c; 0 ..4

•PARTS GUDE

16

SHARP CORPORATION

Industrial Instruments Group Reliability & Quality Control

Yamatokoriyama, Nara

December. 1982

639-11,

Printed

Department

Japan

in

Japan

(Y)

Sharp PC-1251, PC-1250 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual