Tandy PC-6 Service Manual

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I

TANDY®

•

ervlce

POCKET SCIENTIFIC COMPUTER

PC-6

Catalog Number:26-3672

CUSTOM

MANUFACTURED

FOR

RADIO

SHACK,ADIVISIONOFTANDY

CORPORATION

CONTENTS

PAGE

SPECIFICATIONS

HowToOpen Upper

THEORY OF OPERATION

Block Diagram

•.............................

LSI
Ram

Map
Buzzer Control Circu
Interrupt Circuit 6
Keyboard
Power Supply

LSI (Pin Functions)
DISPLAY
TROUBLESHOOTING GUIDE

Test Programs
Operation Check

PCB

ASSEMBLY VIEWS

PARTS LIST

•..............•..........................................••.........

•....••..•..•...........•.........•...•....•..•.•........•.•..

Case

....................................•............••..

...........•......................•.......••..........

...•..•••..••••...•.•..........•..•.........•.•.....•.....•••.

·

......................•.......•.........

...••.....•••..........•...........•........•.......•.............

it

•..........................................•...........

.•.................................................•.........•...

........•.....................................................

.....•.....•...•.............................................

.......•...........................................

........................................•...•.•.•.....•....

.......••..........•..•.......•........................

...........•..•...........................•......................

3
3
4
4
5
5
6

6
7
8

9
10
11
14
19
20

Electrical
Mechanical Parts

EXPLODED VIEW/DISASSEMBLY INSTRUCTIONS 23

SCHEMATIC

Main Block
Keyboard
Display

Parts

DIAGRAM

.........•.•..••..••.....•.•.......•..••..........................

.........•.................•.........•......................

..................•........................................

...•...•...........•....................................

..............••........•..•.....•.............................

.•....•.••.............••........••..•..........................

, 20

21

24
24
25
26

SPECI

FICATIONS

Display Method
Display
Calculation

Range
Program System
Program

Language

NumberofVariables

RAM Capacity

Program

Areas

NumberofStacks

Subroutine

'V

FOR

NEXT

LOOP

Operators

Power Supply

Power Consumption

Battery Life

Memory
protection
battery

Auto

Power-off

Ambient Temperature

Dimensions

Weight

5 x 7 dot-matrix crystal
24-digit, dot-matrix liquid-crystal display

99

±

10-

'V

±9.999999999 x 10

99

Stored System

BASIC

26 fixed variables, exclusive character variable

7520 bytes (system
Maximum

8

levels

4

levels

12

levels

2

lithium
lithium

1

of10(PO

batteries (CR-2032)
battery (CR-1220)

area:

through

672 bytes)

P9)

for

main frame

for

memory backup

and

array variables

Maximum 0.07W

1)

Continuous program execution: approximately 85 hours

2) Continuous display
or

hours

5.5 months when

NOTE: 1 hour includes 10 minutes

dition

2)

Approximately 2

of

5555555555 at 68° F (20°C): approximately 200

unitisused

of

years

(with main batteries installed)

1 hour per day

condition1)and

Approximately 6 minutes

to

32° F

104°F

3/4"Hx5-5/8"Wx2-3/4"D

(O°Cto40°C)

(18 mm x 142 mm x71mm)

5.8 oz (165 g), including batteries

50 minutesofcon-

HowToOpen Upper

Tweezers

Case

1.

Insert the tweezers

2.

Move tweezers gently in the direction indicatedbythe

into

the backofthe upper

arrow in the figure below.

-3-

case.

Block Diagram

THEORY OF OPERATION

a7"Va12, d7"Vd12
b7"Vb12, e7"Ve12
c7"Vc12, RD"VR14

DOT-MATRIX

5 x 7 dots,24digits

D1-D8,OP,

CE, C1,

DISPLAY

C2

a1"Va6, d1"Vd6
b1"Vb6, e1
c1

"Vc6,

Km1"VKm12

GATE

ARRAY
IC4
MB64H193

"Ve6

RD"V

R14

KEYBOARD

RAM

IC3

HM6264ALFP

OPTIONS

NOTE:

26-3651

CMT

Only

26-3652

oneof2 options

26-3671

26-3652

canbeconnectedata

time.

-4-

LSI

Main

CPU

HD61747B20

Sub

CPU

HD61747B25

Gate

Array

MB64H193

RAM

HM6264ALFP-5Q,

BASIC
13thto18th

Calculation,
12th digits and 19thto24th

Interface between

control,

Key signal

digits display control.

I/O

control, key signal

CPU

input/output

digits display control.

and RAM, buzzer control.

Stores data and program. RAM
a self-control circuit.

has

8K

(lower keyboard), 1stto6th

input/output

bytes

(upper keyboard),

(64K

bits) capacity and contains

digits and

7th

to

Ram Map

PH
P5T
P9T
OP

READ#No.

LSI

CPU

(Main)
HD61747B20
CPU

(Sub)
HD61747B25
RAM
HM6264ALFP-50

TOTAL

I

nput

Buffer

Code Buffer

POT

P4T

P8T
RAM

DATA#P

GOSUB STACK

Variable

DATA

MFT
P3T
P7T

I

B

P#X

P

Address

~

ST
P2T

P6T
P9B

IN-

KEY

ROM

113024 bits

113024 bits

226056 bits 69328 bits

000

I

P#

P#

l~aria-..1

ble

No.

PASS

DEFM IMODEI

080

Communication Buffer

P#

Variable check

RAM

1896 bits

1896 bits

65536 bits

I~aria-)j

ble

No

PRT I

I

I

Address k

Users

j i

Area

100

180

I

DISP Buffer

xD
yD

STEP

P#

P#

I~aria-

ble

No.

Address

Varia-

ble

$

FF I

FOR

No

NEXT

-5-

Buzzer Control Circuit

There

are

3 waystooperate the buzzer:

Key

input,

BEEP

0, and

BEEP

1

Mode

Frequency

Time

Interrupt

•

Interrupt

1.

When

2.

PG2

3.

When

PG2.

•

Interrupt

1.

When

VDD2

2.

3.

When

rationofthe RAM and options.

BEEPO

0.9 kHz
110

msec.

BEEP 1

4.55 kHz
110

msec.

Circuit

circuit

the powerison,

for

the clock pulse when

VDD2is"L"

through the IC and 26th pinofthe

VDD2

HD61747825

circuit

the powerison,

for

VDD2

drops, the

PG1

for

the voltageofthe Gate Array and options when

Gate Array and

drops,

outputofthe IC becomes

f---

VDD2

VDD2

and

SWis"L"

VDD4isalso

VDD2

for

Gate Array

Key

Input

4.55 kHz
11

msec.

VDD2

level.

CPU

PG2

"L"

drops.

receive

level.

level.

and

M864H193

PG2.

"GND"

VDD4

82 t----=1..-
81

level and the

becomes

A

..,.,....,

----

8

VDD2

"GND"

A

---.fLJLJL

8LSlSlJ

CPU

does

not

and

SW

drop.

level and stops the op-

receive

VDD2(from
VDD2(from

sw~

IC 4)
IC 2)

Keyboard
HD61747B25 controls the upper keyboard.

HD6174782

HD61747B20 controls the lower keyboard.

HD6174782

Ks2

Ks3'VKs8

Ks9, Ks10

Km1'VKm4

Km5'VKm10

Km11, Km12

-6-

~

VDD4

Upper
KeYboard

Lower
Keyboard

Power Supply
VSSl

VRAM
VlrvV5
VDDl
VDD2

Power supply voltage
Memory

LCD drive voltages. Voltage
Power supply
Stays

usedtokeep the voltage

for

VDDl

at power-on.

the

for

TC4071 BF.

CPU,

for

the RAM.

is

generatedbyconnecting the external resistortoVDD2.

RAM and options.

GoestoGND at power-off or APO (auto power-off).

-7-

IC1

I HD61747B20

IC2

HD61747B25

,

LSI

(Pin

Functions)

~

~:e:

01
02
04

08

INT

KM

K12
K11
K10

Kg

K8

K7
K6
K5
K4

K3
K2

K1

SW

V5

V4

V3

V2

V1

N

.....

~~a:~~

8 0 w

o 0 U

> >

LO

~ ~b:~0:~ii~ ~

U<:J

O

.....

NM<::t

o:o:o:a:a:~~<g:g~~

~

Pin No. Signal Name

1'\,,4

a1
b1

c1
d1
e1

a2
b2
c2

d2

e2

a3
b3

c3
d3
e3
a4
b4
c4

6'\,,18 KM'\"K1

20'\,,24

25,26

27'\,,72 R15'\"R7

76

77

78,

80

D1,2,4,8

5 INT

19

SW

V5'\"V1

PG2,PG1

73
74

75

GND In GND

CE2

CE1
VDD1
VDD2

79

1/)1,1/)2

OP

In/Out
In/Out

In/Out
In/Out

Data

in/out

In

Interrupt
Key signal

Switch signal. GNDatswitch
"OFF"

"ON".

Out

Display voltage. Divided vol­tage from VDD1.

Out,

In

CPU internal clock

Out

Display signal

In/Out

Chip designating signal.

Select RAM

In/Out

Select RAMorother

In Power source

Out

VDD1
VDD1

GND switch
In/Out
In/Out

Clock pulse

Operation

Function

(D1, D2, D3, D4)

signal from

for

keyboard

and

VDD1atswitch

or

other

output

from

at

switch

"OFF".

signal

the

"ON"

RAM

devices
devices

LSI.

and

IC4

MB64H193

,

12

100
106

ADO

107

AD1

VSS
AD2
AD10
AD3

DE

AD4
AD11

13

LD

0

« «

Pin No. Signal

1,2

37

36

02
03

04

E

S1

VSS

S2
B2
B1

CSO

CS1

(J)

coco

0

00

««

N

r--

0 0

0

«

«

0

>

en

co

(fJ (fJ

s

a:

U

U

(fJ (fJ

""

U U

CS2

M

25

24

3
4
5
6

7,8,9

10

11'V18

19

20
22'V24
25'V27

28,29

30 52

31

32

33
34'V37

38

39,40

41

42
43

44'V48 103'V105

Name

100,106

ADO

107

ADl

V55

AD2,

10,3

OE

AD4'VAD12

VDD

RW
CS6'VCS3
C52'VC50

Bl,

B2

V55

51

E

D4'VDl

OP

C2,Cl

VDD2

CE

VDD

In/Out
In/Out

Out

In/Out

Out

In
Out
Out

In/Out

In GND
Out
Out

-

Out

In

In

In

-

In/Out

In Operation

In

In

In Chip enable

In GND

In/Out

Function

Data

in/out

Address

signal

Data

in/out

Address

signal
Power source
Address signal
Output

enable

Address

signal

Read/write
Chipenable
NC
Buzzer signal
GND
V55
GND
NC
Data

in/out

signal
Clock pulse
Power

sou

rce

Data

in/out

signal

signal

-8-

IC3, HM6264ALFB-50

GND 14

Numbers and characters are displayed

is

Following

an explanationofa dot-matrix

in

5 x 7 dots.

Pin No. Signal Name

1

2'V10 A12'VAO

11'V13 1/01'V1/03

14

15'V19

20
21
22

23'V25

26
27
28

DISPLAY

LCD.

In/Out

NC

In/Out

GND In VSS terminal

1/04'V1/08

CE1

A10

OE

A11,9,8

CE2

RIW

VDD

In/Out

In/Out

Out

In/Out

NC

-

In Address signal

Data signal

Data signal

In Chip enable

Address signal
Output
Address signal

In

GND

In Read/write signal

GND

In

Function

enable

e12

c12

a12

60606
00000
00000
00000-----------00000
00000
00000

0

9

b12

0

09

d12

R8-o0000

R9--D0000

RIO

-00000

Rl1--Q0000---

R12-o0000

R13

-aoooa

1"14

-00000

"----------"Vr---------

e1

d1c1b1

+++-t+-I-+++-++-+__- R0

--+++++++++-If+t-I+t--R1

--+++-++++++-1++-+++-R2

--+++-+++t+t-tt++H-

--+++-+++-I+t-t+++H-RL.

-+++-+f++f++t+-t++--

-++++H-++-H+t-H+--

a1

Lower electrode

Upper electrode

Left-half 12 digits

On

----00000

the
are applied horizontally while
vertically

In

R3

RS

R6

the

tage difference exists between signals

play signals
CPU

HD61747B2D

play, while HD61747B25 controls

e1

60606
00000
00000

00000
00000

0909

d1

00000
00000
00000

00000
00000
00000

upper

left figure,

electrodeofthe

on

the

to

the

c1

a1

e12 c12 a12

~O~O~

00000 00000

0

b1

00000
00000--­00000
00000 00000

O?O?O

d12

b12

00000
00000
00000
00000--­00000
00000
00000

"--------

LCD,

other

Lower electrode

Upper electrode

Right-half 12 digits

common

signals

----00000

__

"V_-------~

signals

al'Vel

---OoOOcr-R3

RD'V

to

a12'Ve12 are applied

lower electrodes as shown in above figures.

the

upper-right

LCD

display.

controls

cornerofthe

the

1stto6th

the

RD

and

al.

and

7thto12th

dotisdisplayed when a vol-

The

CPU

13thto18th

and

19thto24th

e1

c1

do~o~

00000
00000

090?0

d1

b1

OOOOo-RO
OOOOD--RI
0000D-R2

0000~R4

OOOOo--RS
0000CJ-R6

R6 and

outputs

R8'V

digitsofdis-

a1

the

digits.

R14

dis-

-----~-----------------------------------------

-9-

TROUBLESHOOTING GUIDE

Symptom

No

displayatall. Weak batteris Replace

Cause Solution

Poor battery

contact

Peeled heat seal

Broken heat seal

LCD

(CA51-TS)

LSI

(HD61747B)

A certain segment(s)

Peeled heat seal

cannot be displayed.

Broken heat seal Replace

LCD

(CA51-TS)

LSI

(HD61747B)

Calculation impossible.

LSI

(HD61747B)

the

batteries.

Clean

the

battery and

Lift

the battery spring.

Replace the heat seal.

the

the

heat seal.

LCD.

LSI.

Replace

Replace the

Replace

Replace the heat seal.

the

heat seal.

Replace

Replace

Replace

the

the

the

LCD.

LSI.

LSI.

contact

spring.

A certain

function.

button

does

not

Poor key

Broken

contact

PC

line

Peeled heat seal

LSI

(HD61747B)

Celan the
key

contact

contact

Connect the

Replace

Replace

the

the

pad on the

rubber.

PC

line.

heat seal.

LSI.

PCB

and

the

-----------~--

-10-

-----------

Test Program

Notes:

1. After typing

2.

Memory
memory capacity.

and

in

the

programs below, save

printer check programs

the

programstoa cassette

cannot

be executedatthe

tape

for future use.

same time becauseofa limited

Memory check program

Ready

p0

LIST

10

CLEAR

20

C=904

25

DEFM

30

FOR

40

D(B)=B

50

NEXT

60

$="ABCDEFGHIJKL

C

B=l

B

TO

MNOPQRSTUVWXYZ"
70
80

90

Ready

BEEP

PRINT

*".

GOTO

PI

,

1:

BEEP 1

"INPUT

#1

LIST

5 A=0
7 A=A+1

10

FOR

B=l

TO

20

IF

D(B)~B

100
30
40

NEXT

IF

B

$="ABCDEFGHI
JKLMNOPQRSTUVWX
YZ"

THEN

50

IF

A=5

THEN

60

100

101
110

PRINT

7

PRINT

G**";:

BEEP
PRINT
PRINT
K**";:

A;:

"CHECK**N

BEEP

0:

"A=";A;
"CHECK**O

BEEP

BEEP 1

III

PRINT

"A=";A;:

END

C

C

THEN

100

GOTO

GOTO

OK

110

1:

III

1:

Printer check program

Ready

PI

LIST

10
20

MODE

PRINT"

7

6 CHECK**

30

PRINT

IJKLMNOPQRSTUVW

XYZ";

40

PRINT

ijklmnopqrstuvw

xyz";

50

PRINT

789";

60

PRINT

+-+oo

...

x-;-."·

-l:SiJJYo";

70

PRINT

>~t()*/+-Err";

FOR

80

90
100
110

A=l

PRINT

NEXT

A

PRINT "

END-

120

MODE

8

*

*PC-

";

"ABCDEFGH

"abcdefgh

"0.123456

"%'@¥[]

"!#$?\«~

TO

...

"I·

28

&+

o

"8";

"

-11

-

Program SAVE,

System:

IpC61

Operation:
(1)

PW

SW

LOAD

ON

+

and

MEMORY

26-3651

or

PC-5

cable

(26-3671 )

+

ICMTI

(2) CMT
(3)

[§J

[L~ADI

(4)

PW

SW

PW

(5)

(6) [II [!]

SW

PLAY

END

OFF
ON

MODE

IEXE!

LOAD

BUZZER RUN DEG

out

INPUT

P0

the 26-3651

P0

OK*

OK*l

OK*

1 2

OK*

1 2 3

DEG

DEG

DEG

+ CMT

DEFM

DEFM

DEFM

Ready

Take

BUZZER RUN
Ready

BUZZER RUN DEG
INPUT

BUZZER RUN

BUZZER RUN DEG DEFM

INPUT

BUZZER RUN

INPUT

(Buzzer sound)

(7) IBRKI

DEG

BUZZER RUN

INPUT

BUZZER RUN DEG DEFM

INPUT

BUZZER RUN DEG DEFM
INPUT

OK*

1 2 3 4

OK*

1 2 3

OK*

CHECK**NG**

DEFM

4CHECK**OK**

-12-

A=l

A=5 (Buzzer sound) OK

(Buzzer sound)

NG

Printer check

System:

I

pC-61

+

26-3651

or

PC-5

cable

(26-3671 )

+

26-3652

PC-4 Printer

(1) PC-6

(2) S 2

Print sample:

PW

SW

ON.

READY

**PC-6

ABCDEFGHIJKLMNOPQRST

UVWXYZabcdefghijklmn
opqrstuvwxyz0.123456

789%'@¥[]&+~+ODAX~

••

~I·O

>~t()*7+-~TI88888888

8888888888888888888

CHECK**

••

EQUy6!#$?\«~

-END-

P0

-13-

Operation Check

1.

When mis-operation occurs, returntothe

the

2. When connecting

printer and cassette interface, be suretoturn

nearest * mark and operate from

off

the

the

* mark.

power switch.

/RESETl

*IMODEI

*IMODEj

QWERTYUIOP

*!BRKj

Operation

1

~

ASDFGHJKL

Read

Out

EXT

RUN DEG

WRT DEG

RUN DEG

RUN

'..l..'

,

I'

RUN

DEG

=,~,

,

I'

7520

DEG

BUZZER

Ready P0

BUZZER
P:,¢,-123456789

BUZZER
Ready

P0

BUZZER
QWERTYUIOP

=

~

BUZZER
ASDFGHJKL

*IBRKI

[§J-

[§J-

ICLS

ZXCVBNM;

I

: ,

IspcI

-14-

BUZZER

lxcvbnm'

BUZZER

-

~<.

xcvbnm;

BUZZER

lxcvbnm;

BUZZER

• I /

-

'I'

EXT

:

, I

EXT

EXT

: ,

EXT

'-2..:'

I'

: ,

RUN

RUN

RUN

,I,

-

'I'

DEG

DEG

DEG

RUN DEG

Operation

*!BRK!

0.123+456-789*9/3

IEXEI

Read

BUZZER EXT

-1910.877

Out

RUN

DEG

*IBRKI

IE

( ) t

~

......

*!BRK]

lM!Jlhypl~

Icoslltanl

~~IEXpl

o M [DEGdJANS!

00

*IBRKI

1.2 ISTATI

*IBRKI

x

110

l

BUZZER EXT

(Check

that

E(

)t'~

E(

, "

)~

'I'

BUZZER EXT

UR

DEG

BUZZER EXT

STAT1.2,0

BUZZER EXT

RUN

DEG

the cursor moves.)

RUN

DEG

(-1910.877 t 2 t

RUN

DEG

RUN

DEG

310t:

~~

[ill~

[TI!EXE I

*~IEXTI

A=B*C[llij

-15-

90

BUZZER EXT
90 E 00

BUZZER

" ,

'I'

RUN

RUN

DEG

DEG

Operation

Read

Out

ICALCI

1231EXEI

456!EXE!

IOUTI

*[MODE!0

BUZZER
B ?

BUZZER

C?

BUZZER
A = 56088

BUZZER
A=B*C

BUZZER

Ready

P0

RUN DEG

RUN DEG

RUN DEG

RUN DEG

DEG

RUN

STOP

STOP

*IMODE!

*!MODE!

IMODEl 2

*!MODEI

!MODEI 5

*!MODE!

•
Ready

P0

•

3

6

BUZZER

Ready P0

BUZZER
Ready P0

BUZZER

Ready

P0

RUN DEG

RUN DEG

RUN RAD

GRA

RUN

TRACEON

-16

-

._--._------------

---_.--_.

Operation

Read

Out

*!MODE

*]MODE

]MODE

QW

..

]INS[

E

[§]

[ 7 BUZZER

Ready

18

19

!EXEI

•

IINSI

BUZZER

, I ,

-

, , "

BUZZER

" ,

Q-W-

, "

" ,

-

, I ,

BUZZER

Q,

"W

-

, , "

BUZZER
QE"

/1

RUN GRA

P0

GRA

GRA

GRA

GRA

1/

-

'

PRT

!MEMOlm

MEMO

!

IL1

EDIT

!MEMOIITNl

- IEDITI

1f0lMQ]

llliJ

IEDITI

ON

1

1

1

IEXE I

IMEMOj

!Asmbl[

*!BRK!

GRA

QE

BUZZER

", /

-

/ I "

BUZZER
Asmbl/Source/ca1

BUZZER
Ready

P0

GRA

IASMBLI

RUN GRA

IMEMOI[&]BUZZER

[MfMQ]

llliJ

1

2

----

-----------

-17

-

Operation

Read

Out

~

IMEMOI

9

..

~~

!EXE!

BEEP

0

1

1

10

!MODEI

*!MODEI

10

IEXEl

20~D

IEXE\ 20 GOTO 10

*!MODEI0

[§J0

BUZZER
Ready P0

BUZZER WRT
10

BEEP

BUZZER

BUZZER
(buzzer sound)

RUN

1

WRT GRA

RUN

GRA

GRA

GRA

7515

7509

!sTopl

POWER
Turn the contrast volume.

SW

OFF/ON Repeat 3 times.

GRA

BUZZER

Display must disappear.
Display should
The display contrast must

RUN

be

"Ready P0."

STOP

change.

-18-

PCB

ASSEMBLYVIEW

TOP

VIEW

TOP

VIEW

-19-

PARTS LIST

Electrical

Parts

Ref. No.

CAPACITORS

Cl'VC4

C5'VC10

Cll,

C13 Electrolytic, 1

Chip, Ceramic, 100pF, 25V, ±5%, CM21CH101J25V ACF-1466 28907311
Chip, Ceramic, O.lttF, 15V, +100%, CM21YV104P15V ACF-7347 71032167

C12

Electrolytic, 22ttF, 10V, ±20%, CE04C-1A220MS7

ICs

ICl
IC2
IC3
IC4
IC5

LSI,
LSI,
LSI, RAM, HM6264ALFP-50 MX-7275 20011149
LSI, MB64H193 MX-7276 20030453
IC, TC4071BF MX-4245

PRINTED

PCl
PC2

Assembly,
Assembly, PCB-G707-2

RESISTORS

CPU,

HD61747B20

CPU,

HD61747B25

CIRCUIT

PCB-G707-1

Description

OOttF,1OV,

±20%, CE04C-l A

BOARD ASSEMBLIES

101

!\liS

RS

Part No.

CE·226MCBA

CE-107MCBA 28041047

MX-7273
MX-7274

Mfr's Part No.

28047223

20018364
20018801

21004359

82636701
82636702

Rl'VR9

Rl0
Rll

R12
R13'VR16 Chip, Ruthenium, 3.9 Kohm, 1/8W, ±5%, CR32-108-392J-T-TP
R17'VR21

R22

R23

R24

Chip, Ruthenium, 3.3 Kohm, 1/8W, ±5%, CR32-108-332J-T-TP
Chip, Ruthenium, 12 Kohm, 1/8W, ±5%, CR32-108-123J-T-TP
Chip, Ruthenium, 68 Kohm, 1/8W, ±2%, CR32-108-683G-T-TP ND-0354CBN
Chip, Ruthenium, 220 ohm, 1/8W, ±10%, CR32-108-221K-T-TP

Chip, Ruthenium, 10 Kohm, 1/8W, ±2%, CR32-108-103G-T-TP
Chip, Ruthenium, 22 Kohm, 1/8W, ±5%, CR32-108-223J-T-TP ND-0311EBN
Chip, Ruthenium, 2.2 Mohm, 1/8W, ±5%, CR32-108-225J-T-TP
Chip, Ruthenium, 100 ohm, 1/8W, ±10%, CR32-108-101 K-T-TP

MISCELLANEOUS

D1'VD3 Diode, 1S1588, silicon

VRl

Volume,

for

contrast, 20 Kohm, EVL-AHAAOOB24

ND·0230EBN
ND-0288EBN

ND-0149FBN
ND-0237EBN
ND-0281CBN

ND-0454EBN
ND-0132FBN

DX-0273
AP-7004

27930620
27930638
27904530
27904734
27903835
27930603
27903740
27904761
27904629

23003031
27709486

-20-

Mechanical Parts

Ref. No.

1

2

3

4

5

6
7

8

9

Description

LCD, CA51-TS
Connector, 126D-019-12S04
Pspring, A33138A-1
Seal,

Heat, T-07-12

Seal,

Insulation,

Plate, Reinforcement,
Tape, Adhesive,
Tape,

Adhesive,
Connector, Non-direction, A46359-1
Sheet, Keyboard, C3473-5
Tape, Adhesive,
Plate, Reinforcement,
Assembly, Film, keyboard, C3769A-1
Film, Keyboard, C3768-1
Cush

ion,

Seal,

Heat, PCB-G707-1toPCB-G707-2, CAX-12-3

Seal,

Insulation,

Seal,

Insulation,

Seal,

Insulation,

Plate, Shield,

Seal,

Blind,

Seal,

Insulation,

Seal,

Insulation,

Buzzer, EFB-S55C41AV1

Tape, Adhesive,
Tape, Adhesive,

Holder,
Plate, Shield, C3500-1 63415930

Window (Tandy)
Tape, Adhesive,

Case,
Case,

Plate,

Knob, Slide, C3499A-1

Spring, Switch contact, A46683-1

Film, Common, C3480-1
Spacer, C3479-1
Set,

Upper,

Lower,
Name

Key

for

top

for

heat

seal.

A47070-8

for

LCD, C46480-1

for

LCD. A43613-5

for

LCD reinforcement plate, A45344-8

for

PCB

reinforcement plate

for

PCB-G707-1, C3474A-1

for

LCD, C41409-1

for

heat

sealofPCB

for

upper keyboard

for

lower keyboard

for

volume

for

Pspring, C41076-1

for

battery (non-repairable)

for

RAM pack (non-repairable)

for

buzzer, A45381-1 63304750

for

keyboard sheet, A44646-1 63275120

PCB-G707-1, C2373-1 63470730

for

window, C4586A-1 63415891

for

display unit, C1141-5

for

display

(Tandy) (non-repairable)

(Tandy)

unit

film

film

(Tandy), C1142-1

RS

Part No.

AL-1020
AJ-7306
ARB-7642
AHC-0107

AHC-0344 63416110

Aj-4025
AHC-0346

AHC-0345
AK-0518
AHC-0347

AHC-0348
AHC-0349
AHC-0350
AHC-0351
ART-0278

AB-7002

AZ-0109

RB-6256
AHC-0111
AHC-0352
AHC-0353

Mfr's Part No.

33310552
35113639
63258131
56005846

63478850
63415920
63375130
63354990
82636721
63424150
63415991
63471021
63471030
63505660
56006320
63471010
63470990
63471000
63458880
63471050

32401627

82637403

63470460
82636704

63416351
63353610
63415950
63415960
82636705

-21-

Ref. No. Description

RS

Part No.

Mfr's Part No.

10 Holder, Battery,

Spring, Battery contact
Spring, Battery contact
Seal,

Insulation,
11
12

13

14

15

16

17
18

19

Holder,

Holder, Battery,
Spring, Battery contact
Spring, Battery contact
Spring, Battery contact
Seal,
Seal,
Plate, Shield,
Cap,

Pin, Spring, 2.5 mm x 12 mm

Label,
Tape, Lead, C4957-1
Seal,
Spacer,
Tape, Adhesive,
Plate, Reinforcement,
Plate, Reinforcement,
Tape, Adhesive,
Tape, Adhesive,
Seal,
Spring, Ground,
Spring, Ground,
Spring, Ground,
Screw, Tapping,

A45491-13,

Screw, Tapping,

A45491-11,
Screw, Tapping,

A44793-13,
Screw, Machine,

A45919-7,
Case,
Case,

Hardware

Screw, Machine,
A45919-8

Battery, Lighium, CR2032

Battery, Lighium,

for

PCB-G707-2, C1251-1

Insulation,
Insulation,

for

Connector, C4615-1

Change

Blind,

for

for

lead

Insulation,

for

for

for

for

Upper,

for

Lower,

for

Kit

for

CR1220, A35803-1

H,

for

CR1220, A35801-1

(+1.

CR1220, A35800-1

for

battery (CR12201. A46472-1

for

CR2032, A35802-1

H,

for

CR2032

(+,

-),

for

CR2032

(+1.

for

CR2032

for

battery (CR-20321. A45154-1

for

battery holder, A46473-1

connector, C4609-1

for

battery, (non-repairable)

PCB

holder, C4991-1 AHC-0355

tape, C41003·1 AHC-0354

for

volume shield plate, A45344-14

for

PCB

holder, PCB-G707-2

for

PCB

holder, PCB-G707-1

for

PCB-G707-1 reinforcement

for

PCB-G707-2 reinforcement

for

volume shield plate, C4639-1

for

keyboard

for

keyboard

for

PCB

flat

head

PCB

holder

flat

head, (+), 2 mm x 3 mm

connector shield plate

flat

head

battery (CR-1220)

pan

head,

battery (CR-2032)

keyboard

keyboard

pan

head, (+), 1.7 mm x 5.4 mm x 3

(for

case,

A47157-7

film,

C4988-1

holder, C4737-1 ARB-5046

(+),2

mm x 3.5 mm

(+1.

2 mm x 5 mm

(+1.

1.7 mm x 5 mm

unit

(Tandy)

unit

(Tandy)

pieces

Memory back up) CR1220

AB-0623
AB-0621
AB-0622
AHC-0354

B-0058
ARB-7639
ARB-7640 63297630
ARB-7641
AHC-2114 63297660
AB-0624 63349720
ART-0279 63415940
AHC-0112 63416410

ART-0280 52100356

ARB-5025

ARB-5045

AHD-2723

AHD-3002

AHD-3003

AHD-2012

AZ·0110

AHW-2603672
AHD-2013

ACS-0031
ACS-0030

63349650
63349890
63349900
63349910
63470550
63349640
63297621

63297640

63459150
63470840
63449540
63393830

63500830
63500840
63497930

63500850
63417130

63416020

63470830

63424160

63330000

63319760

63292930

63391680

63470445

82636723
82636709

63426830

CR2032
CR1220

-22-

~--~---~-~--~~~~~~~~

EXPLODED VIEW/DISASSEMBLY

INSTRUCTIONS

1.

Remove 3 screws

2. Lift up the lower

G)

from the lower case.

case

@and(D.

-23-

3.

4.

Remove

from the

Remove

9 screws

PCB

hOlder@and®.

the

PCB

holder and 2 batteries.

G.

1

screw.

and 1 screw e

Main Block

SCHEMATIC DIAGRAM

41

dll-

dS

c11_

c5

bll_

bS

.11--e

85

~lg::::

~

.10-

..

blO-

1>4

.10-

...

~-

.3

d9_

d3

09-

c3

bS-

b3

09-

.3

_S----

.2

d!!-

d2

~-

.2

bS_

b2

.e-

,2

-1-

.1

d!--<

dl

~Z::::

~1

.7

--<

.1

IC2

HD61747B25

C2

~PF

c:

o~

cc~

C3

IC5

3 1

64

65

01 Y.

151588 O.ljlF

1l111l11

C5

80

Cl

'lJ~

IC5

TC40718F

1

151588

Cll

vss

100
'03

105

'02
'06

'01
'07

AOO

'DB
AD1
AD2

AD10

AD3

AD4

A.D11

ADS

AD9
AD6

ADB
AD7

A012

VDD

RIW

DE

eS3

CS2

eSl

~~

220 n GND

R13'"

R16

3.9Knx4

VDDI

eE2
eEl

VDD4

I

2

OP

.01

02

03

D4

S

'0.

N

-

~

g

c
c

o

(J

c

Buzzer

a

24

!-.

H+t-tt-t1H+tt-t-l1

:!

C4

O.ljlF

(-

E

-

Soldering Pads:

Notes:

(11
(21

All
All

Short

A

- Open

B

-

Short

C

- Open

D

-

E

Short

- Open

F

resistance values are indicated
capacitance values are indicated

(K=10

(P=10-

3

n

in

"n"

in

"IlF"

,

6

M=10

II Fl.

6

nl.

A

-24-

)

)

")

N

U'1

Km12
Km11

Km10
Km9

Km8

Km7
Km6
KmS

Km4
Km3

Km2
Kml

ME

Normal

R

V

T
G
B
Y

N
U

J

M

I

K

:

P

=

SPC
EXT

Asmbl

MODE

,

Normal

BRK

CLS

BS

c;

I

I

I

EXE

STAT

10t

n

+2
ANS

DEGl

rliR

SOR

!

!

LOG

SIN

HYP

&H

ENG
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TAN

tOt;

CAl

OUT

IN

np

t

)

(

9

/

*

6

5

4

R

7

-

+

3
2

1

t

0

LN

(

Shlft

EOX
EOY

FACT

RND(

P9

n r r

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Ph
PS
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REC
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PL

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MID

LEN

DMS$
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Arc:;

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rc

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~

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DIM

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TO
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f

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=

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0----

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-

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-

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0---

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Ks10

Ks9
Ks8
Ks7
Ks6
KsS
Ks4

Ks3
Ks2

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<

C"

o

III

...

c..

RESET

INS

DEL

-+

L

.-

S

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np

0--

~

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RADIO SHACK, A DIVISION OF

TANDY

CORPORATION

7A6

AUSTRALIA

91

KURRAJONG

MOUNT

DRUm,

AYENUE

N.S.W.2110

U.S.A.: FORT WORTH,

TEXAS

CANADA: BARRIE, ONTARIO

TANDY

BELGIUM

RUE

DES

PIEOS

5140

NANINNE<NAMUR)

O'ALOUETTE.

CORPORATION

FRANCE

BP

CERGY

147-95022

PONTOISE

39

76102

L4M

CEOEl

4W5

BILSTON
WEST

U.K.

ROAD

WEONESBURY

MIDLANDSWS101

PRINTED

IN

IN JAPAN @