Radio Shack Hardware Manual PC 6 Service 19xx Tandy Text

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Page Count: 27

Catalog Number: 26-3672

CUSTOM MANUFACTURED FOR RADIO SHACK, ADIVISION OF TANDY CORPORATION

CONTENTS

PAGE

SPECIFICATIONS 3

How To Open Upper Case ..3

THEORY OF OPERATION 4

Block Diagram 4

LSI 5

Ram Map 5

Buzzer Control Circuit 6

Interrupt Circuit 6

Keyboard 6

Power Supply 7

LSI (Pin Functions) 8

DISPLAY 9

TROUBLESHOOTING GUIDE 10

Test Programs 11

Operation Check 14

PCB ASSEMBLY VIEWS 19

PARTS LIST 20

Electrical Parts 20

Mechanical Parts 21

EXPLODED VIEW/DISASSEMBLY INSTRUCTIONS 23

SCHEMATIC DIAGRAM 24

Main Block m24

Keyboard .25

Display 26

SPECIFICATIONS

Display Method

Display

Calculation Range

Program System

Program Language

Number of Variables

RAM Capacity

Program Areas

Number of Stacks

Subroutine

FOR-v NEXT

LOOP

Operators

Power Supply

Power Consumption

Battery Life

Memory

protection

battery

Auto Power-off

Ambient Temperature

Dimensions

Weight

5x7 dot-matrix crystal

24-digit, dot-matrix liquid-crystal display

±10" -v ±9.999999999 x10"

Stored System

BASIC

26 fixed variables, exclusive character variable and array variables

7520 bytes (system area: 672 bytes)

Maximum of 10 (P0 through P9)

8levels

4levels

12 levels

2lithium batteries (CR-2032) for main frame

1lithium battery (CR-1220) for memory backup

Maximum 0.07W

1) Continuous program execution: approximately 85 hours

2) Continuous display of 5555555555 at 68° F(20°C): approximately 200

hours or 5.5 months when unit is used 1hour per day

NOTE: 1hour includes 10 minutes of condition 1) and 50 minutes of con-

dition 2)

Approximately 2years (with main batteries installed)

Approximately 6minutes

32°Fto104°F (0°Cto40°C)

3/4"H x5-5/8"W x2-3/4"D (18 mm x142 mm x71 mm)

5.8 oz (165 g), including batteries

How To Open Upper Case

Tweezers

Insert the tweezers into the back of the upper case.

2. Move tweezers gently in the direction indicated by the

arrow in the figure below.

THEORY OF OPERATION

Block Diagram

ayva12, d7^cl12

b7M)12, 67^12

07^012, R(rvR14

DOT-MATRIX DISPLAY

5x7 dots, 24 digits

KEYBOARD

Ks2'VKs10

ts: JI7S

CPU IC2

HD61747B25

aTva6, d1^d6

bl^be, el'Vee

Km1^Km12

CPU IC1 A

HD61747B20\r

D1-D8,OP,CE,C1,C2

KEYBOARD

I—\GATE ARRAY

)IC4

—/MB64H193

/\RAM IC3

\/HM6264ALFP

AD0-AD12

CS3-CS6

IO0-IO7

OPTIONS 7\26-3671

26-3651

CMT 26-3652

26-3671

26-3652

NOTE: Only one of 2options can be connected at atime.

-4

LSI

Main CPU

HD61747B20

Sub CPU

HD61747B25

BASIC control, Key signal input/output (lower keyboard), 1st to 6th digits and

13th to 18th digits display control.

Calculation, I/O control, key signal input/output (upper keyboard), 7th to

12th digits and 19th to 24th digits display control.

Gate Array

MB64H193 Interface between CPU and RAM, buzzer control.

RAM

HM6264ALFP-50, Stores data and program. RAM has 8K bytes (64K bits) capacity and contains

aself-control circuit.

Ram Map

LSI ROM RAM

CPU (Main)

HD61747B20 113024 bits 1896 bits

CPU (Sub)

HD61747B25 113024 bits 1896 bits

RAM

HM6264ALFP-50 65536 bits

TOTAL 226056 bits 69328 bits

Input Buffer

Code Buffer

P1T POT MFT ST

P5T P4T P3T P2T

P9T P8T P7T P6T

OP RAM Variable BP9B

READ#No. DATA#P DATA PP#X IN-

KEY

Address P#

GOSUB STAC K

DISP Buffer

P# Varia-

ble No.

STEP

P# Varia-

ble No. Address

000

080

P# ble No

P# Varia-

ble No.

PASS

DEFM MODE

PRT

Address kj

Users Area

Communication Buffer

Variable check

FOR NEXT

100

180

-5-

Buzzer Control Circuit

There are 3ways to operate the buzzer:

Key input, BEEP 0, and BEEP 1

Mode BEEPO BEEP 1Key Input

Frequency 0.9 kHz 4.55 kHz 4.55 kHz

Time 110 msec. 110 msec. 11msec.

MB64H193 BB-uinr

Interrupt Circuit

•Interrupt circuit for the clock pulse when VDD2 drops.

When the power is on, VDD2 is "L" level.

2. PG2 through the IC and 26th pin of the CPU receive PG2.

3. When VDD2 drops, the output of the IC becomes "GND" level and the CPU does not receive

PG2.

PG1

HD61747B25

-J^Kk PG2

VDD2

Interrupt circuit for the voltage of the Gate Array and options when VDD2 and SW drop.

1. When the power is on, VDD2 and SW is "L" level.

2. VDD2 for Gate Array and VOD4 is also "L" level.

3. When VDD2 drops, VDD2 for Gate Array and VDD4 becomes "GND" level and stops the op-

ration of the RAM and options.

VDD2(fromlC4)

VDD2(fromlC2)

Keyboard

HD61747B25 controls the upper keyboard.

VDD4

HD61747B25*

HD61747B20 controls the lower keyboard.

HD61747B20^

Ks2

Ks3^Ks8

Ks9, KslO

Km1^Km4

Km5^Km10

Km11, Km12

Upper

Keyboard

Lower

Keyboard

Power Supply

VSS1 Power supply voltage for TC4071BF.

VRAM Memory used to keep the voltage for the RAM.

VKV5 LCD drive voltages. Voltage is generated by connecting the external resistor to VDD2.

VDD1 Power supply for the CPU, RAM and options.

VDD2 Stays VDD1 at power-on. Goes to GND at power-off or APO (auto power-off).

-7-

LSI (Pin Functions)

IC1,HD61747B20

IC2, HD61747B25

!is|S|K{SiiS}S{Sls|dg|SjS|:

11 ] i11 11AAAAA

1_U_

24 -<

INT

K12

K11

K10

cm r- ,_ (mq r^ o

^.^ Q O LU UJ2 CC CC

r- CN CO ^t LD CD

CC DC CC CC CC DC

CN <- LD

(J d^CO OT

q_ q_ DC CC CC

O*- CN CO <*

DC CC DC DC CC

LD cd r-. CO

Cslj CNJ CM ICN

iMsWalsIsWfiWslsl

,64

,62

,60

,56

,55

^54

,53

,52

r51

r50

349

,46

:45

r44

_43

Pin No. Signal Name In/Out Function

Tv4 01,2,4,8 In/Out Data in/out (D1, D2, D3, D4)

5INT In Interrupt signal from RAM

6^18 KM'VKI In/Out Key signal for keyboard

19 SW In/Out Switch signal. GND at switch

"OFF" and VDD1 at switch

"ON".

2CV24 V5M/1 Out Display voltage. Divided vol-

tage from VDD1.

25,26 PG2, PG1 Out, In CPU internal clock

27V72 R15'\>R7 Out Display signal

73 GND In GND

74 CE2 In/Out Chip designating signal.

Select RAM or other devices

75 CE1 In/Out Select RAM or other devices

76 VDD1 In Power source

77 VDD2 Out VDD1 output from the LSI.

VDD1 at switch "ON" and

GND switch "OFF".

78,79 01,02 In/Out Clock pulse

80 OP In/Out Operation signal

IC4, MB64H193

48 37

•^cncoCiujq<-cncl

OO O O O QU

_ _ _ >uU O Q

IO0

106

ADO

107

AD1

VSS

AD2

AD10

AD3

AD4

AD11

VSS

CS0

CS1

CS2

ID O) ©00

QQO Q

< < < <

>CC

CD LD -3" CO

CO CO CO CO

OOOCJ

13 24

Pin No. Signal Name In/Out Function

1, 2IO0, I06 In/Out Data in/out

3ADO Out Address signal

4I07 In/Out Data in/out

5AD1 Out Address signal

6VSS In Power source

7,8,9 AD2, 10,3 Out Address signal

10 OE Out Output enable

11M8 AD4'VAD12 In/Out Address signal

19 VDD In GND

20 RW Out Read/write signal

22^24 CS6^CS3 Out Chip enable signal

25^27 CS2^CS0 -NC

28,29 81, B2 Out Buzzer signal

30 S2 In GND

31 VSS In VSS

32 S1 In GND

33 E-NC

34^37 D4MD1 In/Out Data in/out

38 OP In Operation signal

39,40 C2,C1 In Clock pulse

41 VDD2 In Power source

42 CE In Chip enable

43 VDD In GND

44^48 103^105 In/Out Data in/out -

-8-

IC3, HM6264ALFB-50

NC |1

Ai2 [X

A7|3

A6r~4

A5|5

A4|6

A3|~T

A218

Aq|Tq

l/Oi| 11

i/o 2Q7

!/0 3[T3

gnd|

I14

28 |Vcc

27 |R/W

~26]cE2

25 |A8

24 |A9

23] An

22~[OE

21~[Aiq

~2o"|CE1

TFJi/Os

Tili/07

TT]i/06

jF]l/04

Pin No. Signal Name In/Out Function

1NC -NC

2M0 A12^A0 In Address signal

11M3 I/01M/03 In/Out Data signal

14 GND In VSS terminal

15^19 1/04^1/08 In/Out Data signal

20 CE1 In Chip enable

21 A10 In/Out Address signal

22 OE Out Output enable

23^25 A11,9,8 In/Out Address signal

26 CE2 In GND

27 R/W In Read/write signal

28 VDD In GND

DISPLAY

Numbers and characters are displayed in 5x7dots.

Following is an explanation of adot-matrix LCD.

e12 c12 a12

QODOQ

oaaaa

aaoaa

aaaoQ

—

oaaaa

aaaaa

acpacpa

d12 b12

R8—aaaaa

R9 —aaaaa

Rio —aaaaa

R11 —aaaaa—

r12 —aaaaa

R13 —aaaaa

pu. —aoaaa

Lower electrode

Upper electrode

e1 da1

aaaaa

-aaaaa

aaaaa

acparpa

d1 b1

aaaaa

-aaaaa

aaaaa

e12 c12 a12

iaaao

aaaaa

—

aaaaa

atpacpa

d12 b12

aaaaa

aaaaa-

aaaaa

Lower electrode

Upper electrode

e1 da1

rJiaAai

aaaaa

-aaaaa

aaaaa

atpacpa

d1 b1

aaaaa—ro

aaaaa

—

aaaaa—R2

-aaaaa—R3

aaaaa—rl

aaaaa

—

aaaaa—ns

Left-half 12 digits Right-half 12 digits

e1 dl cl bl a1

MHH3-B

£3-E3-G-E3-B

£3~EH3-E3-B

-RO

-RI

-R2

-R3

-R4

-R5

-R6

On the upper electrode of the LCD, common signals RCKR6 and RB'vRM

are applied horizontally while other signals a1^e1 to a12^e12 are applied

vertically on the lower electrodes as shown in above figures.

In the left figure, the upper-right corner of the dot is displayed when avol-

tage difference exists between signals RO and a1. The CPU outputs the dis-

play signals to the LCD display.

CPU HD61747B20 controls the 1st to 6th and 13th to 18th digits of dis-

play, while HD61747B25 controls the 7th to 12th and 19th to 24th digits.

-9-

TROUBLESHOOTING GUIDE

Symptom

No display at all.

Acertain segment(s)

cannot be displayed.

Acertain button does not

function.

Cause

Weak batteris

Poor battery contact

Peeled heat seal

Broken heat seal

LCD(CA51-TS)

LSI (HD61747B)

Calculation impossible.

Peeled heat seal

Broken heat seal

LCD (CA51-TS)

LSI (HD61747B)

Poor key contact

Broken PC line

Peeled heat seal

LSI (HD61747B)

Solution

Replace the batteries.

Clean the battery and contact spring.

Lift the battery spring.

Replace the heat seal.

Replace the LCD.

Replace the LSI.

Replace the heat seal.

Replace the LCD.

Replace the LSI.

Celan the contact pad on the PCB and the

key contact rubber.

Connect the PC line.

Replace the heat seal.

Replace the LSI.

-10-

Test Program

Notes:

After typing in the programs below, save the programs to acassette tape for future use.

2. Memory and printer check programs cannot be executed at the same time because of alimited

memory capacity.

Memory check program

Ready P0

LIST

CLEAR

C=904

DEFM C

FOR B=l TO C

D(B)=B

NEXT B

$="ABCDEFGHIJKL

MNOPQRSTUVWXYZ"

BEEP 1: BEEP 1

PRINT "INPUT OK

90 GOTO #1

A=0

A=A+1

FOR B=l TO C

IF D(B)#B THEN

100

NEXT B

IF $="ABCDEFGHI

JKLMNOPQRSTUVWX

YZ" THEN 100

IF A=5 THEN 110

PRINT A; :GOTO

PRINT "CHECK* *N

G**"; :BEEP 1:

BEEP 0: GOTO 111

PRINT "A=";A;

PRINT "CHECK**0

K**" ;:BEEP 1:

BEEP 1

PRINT "A=";A;

END

Ready

LIST

100

101

110

111

Printer check program

Ready PI

LIST

10 MODE 7

20 PRINT "**PC-

6CHECK**

30 PRINT "ABCDEFGH

IJKLMNOPQRSTUVW

XYZ";

40 PRINT "abcdefgh

ijklmnopqrstuvw

xyz" ;

50 PRINT "0.123456

789";

60 PRINT "%' @¥[] &+-

4<->-0 o*x ^**** :: *'°

-EfiUY<5 n

;

70 PRINT "!#$?\<<>

>^t () */+- £^»;

80 FOR A=l TO 28

90 PRINT "8";

100 NEXT A

110 PRINT "

END-

120 MODE 8

-11 -

Program SAVE, LOAD and MEMORY

System:

PC6 +

26-3651

or PC-5

cable

(26-3671)

+CMT

Operation:

(1) PW ,

(2) CMT

SW ON

PLAY MODE

LOAD

(3) SEXE LOAD

END BUZZER RUN DEG

Ready P0

(4) PW SW OFF

(5) PW SW ON

(6) S

Take out the 26-3651 +CMT

BUZZER RUN DEG

Ready P0

BUZZER RUN DEG DEFM

INPUT OK* (Buzzer sound)

BUZZER RUN DEG DEFM

INPUT OK*1

BUZZER RUN DEG DEFM

INPUT OK* 12

BUZZER RUN DEG DEFM

INPUT OK* 123

BUZZER RUN DEG DEFM

INPUT OK* 12 34

BUZZER RUN DEG DEFM

INPUT OK* 1234CHECK**OK**A=5 (Buzzer sound) OK

BUZZER RUN DEG DEFM

INPUT OK* CHECK**NG**A=1 (Buzzer sound) NG

(7) IBRK

-12-

Printer check

System:

26-3651

or PC-5

cable

(26-3671)

PC-6 +26-3652

PC-4 Printer

(1) PC-6 F

(2) S2

>W SW N.

RE/

Print sample:

**PC-6 CHECK**

ABCDEFGHIJKLMNOPQRST

UVWXYZabcdefghijklmn

opqrstuvwxyz0. 123456

789% ,@¥[]&^+ooaXt**

>M ()*/+-£TT88888888

8888888888888888888

-END-

-13-

Operation Check

1. When mis-operation occurs, return to the nearest* mark and operate from the *mark

2. When connecting the printer and cassette interface, be sure to turn off the power switch.

Operation Read Out

BUZZER RUN DEG

Ready P0

(RESET

BUZZER WRJ DEG 7520

P^: 123456789

*|MODEj 1

BUZZER RUN DEG

Ready P0

*|MODEl

QWERTYUIOP BUZZER RUN DEG

QWERTYUIOP )~[

*FbRK] ASDFGHJKL- [EXT] BUZZER EXT RUN DEG

ASDFGHJKL =-'

*[BRK] ZXCVBNM;:, (SPCl BUZZER EXT RUN DEG

zxcvbnm; :—'

[s> BUZZER EXTRUN DEG

-z-xcvbnm; :,

®- BUZZER EXT RUN DEG

zxcvbnm; :,"-L'

BUZZER EXTRUN DEG

't\

|CLSJ

-14-

Operation

•iBRKl

0.123+456-789*9/3

•BRK

E( )t

•BRK

|&F^ [hypl[sinl[cosl [tan

tog)[in|[EXP

5j [Vj 1deg(1 |ans

x2x310*

•BRK

1.2 STAT

•BRIO

ISllsinlllllEXEl

ENG

•IbrkIIextI

a=b*c[jn]

Read Out

BUZZER EXT RUN DEG

-1910.877

BUZZER EXTRUN DEG

(Check that the cursor moves.

e( )t;-r{

BUZZER EXTRUN DEG

UR DEG (-1910.877 t2t310f

BUZZER EXT RUISi DEG

STAT 1.2,0

BUZZER EXT RUN DEG

BUZZER EXTRUN DEG

90 E00

BUZZER RUN DEG

15-

Operation

ICALCl

123 EXE

456 EXE

WJT

•ImodeI o

•WIODE •

•IMODEl •

iMODEl 2

•IMODEl 3

iMODEl 5

•MODE] 6

Read Out

BUZZER

RUN DEG

BUZZER RUN DEG

BUZZER RUN DEG STOP

A=56088

BUZZER RUN DEG STOP

A=B*C

BUZZER RUN DEG

Ready P0

RUN DEG

Ready P0

BUZZER

Ready P0

RUN DEG TRACEON

BUZZER RUN RAD

Ready P0

BUZZER RUN GRA

Ready P0

Operation Read Out

BUZZER RUN GRA PRT ON

Ready P0

•MODE 7

iitKiT

•MODE 8BUZZER GRA |MEMO|^ 1

•1"^

(MODE 9

QW|EXE| BUZZER GRA IMEMOI™^ 1

Q-W-

s1^

INS

BUZZER GRA iMEMOl^^ 1

E|SI||NS| BUZZER GRA [MEMOl^^ y

QE m/

|EXE| BUZZER GRA |MEMO|^ 1

BUZZER GRA iMEMOl^ 2

/1^

|MEMO|

Asmbl BUZZER |ASMBL1

Asmbl /Source /ca1

BUZZER RUN GRA

Ready P0

•BRK

-17

Operation

IMODE1 9

IMEMOI

[is] [bsI

1EXE1

JMODEl

•iMODEl 1

10 BEEP 1

EXE

20[|]D 10

IEXEI

•IMODEl

[Sj

ISTOPI

POWER SW OFF/ON Repeat 3times.

Turn the contrast volume.

Read Out

BUZZER RUN GRA

Ready P0

BUZZER WRT GRA

10 BEEP 1

BUZZER WRT GRA

20 GOTO 10

BUZZER RUN GRA

(buzzer sound)

7515

7509

BUZZER RUN GRA STOP

Display must disappear.

Display should be "Ready P0."

The display contrast must change.

-18-

PCB ASSEMBLY VIEW

TOP VIEW

-19-

PARTS LIST

Electrical Parts

Ref. No. Description RSPart No. Mfr's Part No.

CAPACITORS

CTVC4 Chip, Ceramic, 100pF, 25V, ±5%, CM21CH101J25V ACF-1466 28907311

C5^C10 Chip, Ceramic, O.ljuF, 15V, +100%, CM21YV104P15V ACF-7347 71032167

C11,C12 Electrolytic, 22juF, 10V, ±20%, CE04C-1 A220MS7 CE-226MCBA 28047223

C13 Electrolytic, 100juF, 10V, ±20%, CE04C-1A1 01 MS CE-107MCBA 28041047

ICs

IC1 LSI, CPU, HD61747B20 MX-7273 20018364

IC2 LSI, CPU, HD61747B25 MX-7274 20018801

IC3 LSI, RAM, HM6264ALFP-50 MX-7275 20011149

IC4 LSI, MB64H193 MX-7276 20030453

IC5 IC, TC4071BF MX-4245 21004359

PRIN-FED CIRCUIT BOARD ASSEMBLIES

PC1 Assembly, PCB-G707-1 82636701

PC2 Assembly, PCB-G707-2 82636702

RESISTORS

RT\/R9 Chip, Ruthenium, 3.3 Kohm, 1/8W, ±5%, CR32-108-332J-T-TP ND-0230EBN 27930620

R10 Chip, Ruthenium, 12 Kohm, 1/8W, ±5%, CR32-108-123J-T-TP ND-0288EBN 27930638

R11 Chip, Ruthenium, 68 Kohm, 1/8W, ±2%, CR32-108-683G-T-TP ND-0354CBN 27904530

R12 Chip, Ruthenium, 220 ohm, 1/8W, ±10%, CR32-1 08-221 K-T-TP ND-0149FBN 27904734

R13^R16 Chip, Ruthenium, 3.9 Kohm, 1/8W, ±5%, CR32-108-392J-T-TP ND-0237EBN 27903835

R17^R21 Chip, Ruthenium, 10 Kohm, 1/8W, ±2%, CR32-108-103G-T-TP ND-0281CBN 27930603

R22 Chip, Ruthenium, 22 Kohm, 1/8W, ±5%, CR32-108-223J-T-TP ND-0311EBN 27903740

R23 Chip, Ruthenium, 2.2 Mohm, 1/8W, ±5%, CR32-108-225J-T-TP ND-0454EBN 27904761

R24 Chip, Ruthenium, 100 ohm, 1/8W, ±10%, CR32-108-101 K-T-TP ND-0132FBN 27904629

MISCELLANEOUS

D1^D3 Diode, 1S1 588, silicon DX-0273 23003031

VR1 Volume, for contrast, 20 Kohm, EVL-AHAA00B24 AP-7004 27709486

-20-

Mechanical Parts

Ret. No. Description RS Part No. Mfr's Part No.

LCD,CA51-TS

Connector, 126D-019-12S04

Pspring, A33138A-1

Seal, Heat, T-07-12

Seal, Insulation, for heat seal, A47070-8

Plate, Reinforcement, for LCD, C46480-1

Tape, Adhesive, for LCD, A43613-5

Tape, Adhesive, for LCD reinforcement plate, A45344-8

Connector, Non-direction, A46359-1

Sheet, Keyboard, C3473-5

Tape, Adhesive, for PCB reinforcement plate

Plate, Reinforcement, for PCB-G707-1 ,C3474A-1

Assembly, Film, keyboard, C3769A-1

Film, Keyboard, C3768-1

Cushion, for LCD,C41409-1

Seal, Heat, PCB-G7Q7-1 to PCB-G707-2, CAX-12-3

Seal, Insulation, for heat seal of PCB

Seal, Insulation, for upper keyboard film

Seal, Insulation, for lower keyboard film

Plate, Shield, for volume

Seal, Blind, for Pspring, C41 076-1

Seal, Insulation, for battery (non-repairable)

Seal, Insulation, for RAM pack (non-repairable)

Buzzer, EFB-S55C41AV1

Tape, Adhesive, for buzzer, A45381-1

Tape, Adhesive, for keyboard sheet, A44646-1

Holder, for PCB-G707-1, C2373-1

Plate, Shield, C3500-1

Window (Tandy)

Tape, Adhesive, for window, C4586A-1

Case, Upper, for display unit, C1 141-5

Case, Lower, for display unit (Tandy), C1 142-1

Plate, Name (Tandy) (non-repairable)

Knob, Slide, C3499A-1

Spring, Switch contact, A46683-1

Film, Common, C3480-1

Spacer, C3479-1

Set, Keytop (Tandy)

AL-1020

AJ-7306

ARB-7642

AHC-0107

AHC-0344

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

33310552

35113639

63258131

56005846

63416110

63478850

63415920

63375130

63354990

82636721

63424150

63415991

63471021

63471030

63505660

56006320

63471010

63470990

63471000

63458880

63471050

32401627

63304750

63275120

63470730

63415930

82637403

63415891

63470460

82636704

63416351

63353610

63415950

63415960

82636705

-21-

Ref. No. Description

Holder, Battery, for CR1220, A35803-1

Spring, Battery contact (-), for CR1220, A35801-1

Spring, Battery contact (+), CR1220, A35800-1

Seal, Insulation, for battery (CR1220), A46472-1

Holder, for PCB-G707-2, C1251-1

Holder, Battery, for CR2032, A35802-1

Spring, Battery contact (-), for CR2032

Spring, Battery contact (+, -), for CR2032

Spring, Battery contact (+), for CR2032

Seal, Insulation, for battery (CR-2032), A45154-1

Seal, Insulation, for battery holder, A46473-1

Plate, Shield, for connector, C4609-1

Cap, Connector, C4615-1

Pin, Spring, 2.5 mm x12 mm

Label, Change for battery, (non-repairable)

Tape, Lead, C4957-1

Seal, Blind, for PCB holder, C4991 -1

Spacer, for lead tape, C41 003-1

Tape, Adhesive, for volume shield plate, A45344-14

Plate, Reinforcement, for PCB holder, PCB-G707-2

Plate, Reinforcement, for PCB holder, PCB-G707-1

Tape, Adhesive, for PCB-G707-1 reinforcement

Tape, Adhesive, for PCB-G707-2 reinforcement

Seal, Insulation, for volume shield plate, C4639-1

Spring, Ground, for keyboard case, A47 157-7

Spring, Ground, for keyboard film, C4988-1

Spring, Ground, for PCB holder, C4737-1

Screw, Tapping, flat head (+), 2mm x3.5 mm

A45491 -1 3, for PCB holder

Screw, Tapping, flat head, (+), 2mm x3mm

A45491-1 1,for connector shield plate

Screw, Tapping, flat head (+), 2mm x5mm

A44793-1 3, for battery (CR-1220)

Screw, Machine, pan head, (+), 1.7 mm x 5 mm

A45919-7, for battery (CR-2032)

Case, Upper, for keyboard unit (Tandy)

Case, Lower, for keyboard unit (Tandy)

Hardware Kit

Screw, Machine, pan head, (+), 1.7 mm x5.4 mm x3pieces

A45919-8

Battery, Lighium, CR2032

Battery, Lighium, (for Memory back up) CR1220

RS Part No.

AB-0623

AB-0621

AB-0622

AHC-0354

B-0058

ARB-7639

ARB-7640

ARB-7641

AHC-2114

AB-0624

ART-0279

AHC-0112

ART-0280

AHC-0355

AHC-0354

ARB-5025

ARB-5045

ARB-5046

AHD-2723

AHD-3002

Mfr's Part No.

63349650

63349890

63349900

63349910

63470550

63349640

63297621

63297630

63297640

63297660

63349720

63415940

63416410

52100356

63459150

63470840

63449540

63393830

63500830

63500840

63497930

63500850

63417130

63416020

63470830

63424160

63330000

63319760

AHD-3003 63292930

AHD-2012 63391680

AZ-0110 63470445

82636723

AHW-2603672 82636709

AHD-2013 63426830

ACS-0031 CR2032

ACS-0030 CR1220

-22-

EXPLODED VIEW/DISASSEMBLY

INSTRUCTIONS

Remove 3screws ^from the lower case.

2. Lift up the lower case @and(Y).

from the PCB holder (fj) and(5).

4. Remove the PCB holder and 2batteries.

-23-

SCHEMATIC DIAGRAM

1C5

3^1

><£

Main Block 40 1IJlllllJllllIil25

b11-

•10-

d10-

c10-

blO-

ilO-

•9-

d9-

c9-

b9-

•8-

b8-

•8-

•7-

d7-

cocectctr <to.o.

IC2

HD61747B25

*-*VW*- K»2 k,3

oNraa

toto*oo*T-or>.ZujuiQO &

OC EC CC 0C 0C OC (C OC OO»•- NO

ffffVfff

TC4071BF

I—vi

f—V2

*—V3

t—V4 R1^R9

«—V5 3.3Knx9

**VSAA*K«4

K5 *-WW*»Kj5

K6 *-fr>/VV-»Kt6

K7 <-^w\^»Ki7

K8 «_»*W^K»8

K9 «-*W^ K*9

kio #-*'s/\Nfc*> k«io

K12

INT

TfTTTTTT

100pF

103 <-

105 <-

102 "*-

106 *-

101 *-

107 -*-

ADO <-

108 <-

AD1

AD2 **-

AD10 *-

AD3 *-

0£ <-

ADA *-

AD11 <~

AD5 <-

A09 <-

AD6 <-

AD8<-

CS1 -*

NC *

IC3 HM6264ALFP-50

i|||5|8js58i|j

~t tit t

100pF

5SaSououuoa

IC4 £

vss

MB64H193 »

SSSSSSosSSSS

yyyyuu lyyyvjy

ummmml 25

OCBCOCCCOC

IC1

HD61747B20

KIO

K11

K12

INT

-Kml

*Km2

"Km3

•Kn>4.

*Km5

*Km6

"Km7

"Km8

Km9

*Km10

*Km11 Km12

6MUUllUM[m 80

D1 L

1SI 588 0.1m F

-if-

100pF

*.. R17^ R21

10 Kn x5

^VR1

20 Kn

Slide SW

O.VF

IC5

TC4071BF

*&i

R22D2

-AAAr>M

:22Kn 1S1588

R12

220 n

±C11

22jiF10V

—*.cei

—>VDD4

-^1

-* 2

->-OP

—>D1

R13^ R16

3.9 Kn x4

-<V

Buzzer

_JT

Soldering Pads: A-Short

B—Open

C-Short

D—Open

E-Short

F—Open

Notes: (1) Ail resistance values are indicated in "n" (K=103a, M=106a)

(2) Ail capacitance values are indicated in '>F" (P=10~6pF).

-24

Keyboard

WW (0 (fl (fl (fl ifl 10 LO

000006606000000660000600066000666060

000 00 00000000000000 00 99999999999999

oJ=tti—

oVAJT

E E EEEEEE EEEE

1—

.— .•

«,

—

.—j

—

—i

—

-E

t_ a:

—

1—

)(

pc;

1—

!) d

C£

CTi

—

}—

) c

p<j

!> <!

—

<—

pc;

!) c

—

i)c

1—

—

«—

)(!

)J.

1—

CSI

:> d

>—

<**

pc;

—

*—

—

\—

»—

la-

—

•

—

-z.

1—

t— t

ZLL

<<:

1-1

»—•

—

O-J

—

•—

—

F—

(—

—

LUH

f<s>

-25-

Display

-b3

-26-

RADIO SHACK, ADIVISION OF TANDY CORPORATION

U.S.A.: FORT WORTH, TEXAS 76102

CANADA: BARRIE, ONTARIO L4M 4W5

TANDY CORPORATION

AUSTRALIA BELBIUM FRANCE O.

91 KURRAIONB AVENUE RUE DES PIEOS O'AIOUETTE. 39 BP 147-95022 BILSTON ROAO WEDNESBURY

MOUNT ORUin, N.S.W.2770 5140 NANINNE(NAMUR) CERGT PONTOISE CEOEX WEST MIDLANDS WS 107 IN

7A6 PRINTED IN JAPAN

Radio Shack Hardware Manual PC 6 Service 19xx Tandy Text

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