Casio PR-420A Instrucciones de instalación y mantenimiento

PR-420A (ZX-516C)

DR-1212LA (ZX-516D)

DEC. 1995

(without price)

INDEX

CONTENTS

1. SPECIFICATIONS ......................................................................................................... 1

2. BLOCK DIAGRAM ........................................................................................................ 1

3. CPU (MN158418YCY) PIN FUNCTION......................................................................... 2

4. DIAGNOSTICS .............................................................................................................. 3

5. TROUBLESHOOTING................................................................................................... 5

6. DISASSEMBLY VIEW ................................................................................................... 6

7. SCHEMATIC DIAGRAMS ............................................................................................. 9

8. PARTS LIST ................................................................................................................ 12

— 1 —

Display tube

13-LT-09G

CPU

MN158418YCY

Power supply

circuit

Slide switch

Keyboard

Printer

M-80

VF1, VF2

Ribbon shift signal

Character selective signal

Timing pulse

Digital signal

D1 ~ D13

Motor control signal

VDD, VSS

Sent signal

Sa ~ Sg, SAP, SDP

SO1 ~ SO7

SI1 ~ SI3, SI5

KO1 ~ KO8

KI1 ~ KI5

VIM, VDD

1. SPECIFICATIONS

Roll paper size : Width: 57 ~ 58 mm

Ink ribbon : Red/Black: RB-02

Green/Black: GB-02

Power source : AC 100, 120, 220 or 240 (±10 V), 50/60 Hz

• Refer to the operation manual for other specifications.

2. BLOCK DIAGRAM

— 2 —

Pin No. Signal I/O Function

1~7, 64 P00~P13 Out Common signal for keyboard

8~12 P20~P22, P32, P33 In Key signal from keyboard

13 IRQ In Timing pulse signal from printer

14 DEBIN In Reset pulse (Not used)

15 IRQCNT In Auxiliary timing (VDD)

16 P40 Out Motor control signal

17 P41 Out Ribbon shift signal for printer

18~30 P42, P43, P50~P53, Out Character selective signal for printer

P70~P73, P80~P82

31, 32 P83, P90 Out Segment signal for display,

Character selective signal for printer

33~39 P91~P93 Out Common signal for slide switch,

PA0~PA3 Segment signal for display

40 P60 In Input port (VDD)

41~43 P61~P63 In Signal from slide switch

44~56 PB0~PB3, Out Digit signal for display

PC0~PC3,

PD0~PD3,

PE0

57 VPP In GND terminal

58 VDD In VDD terminal (+33 V)

59, 60 OSC1, OSC2 I/O Clock signal for CPU

61 VSS In VSS terminal (+28 V)

62 SYNC — Not used

63 RST In Signal from slide switch, Reset signal

3. CPU (MN158418YCY) PIN FUNCTION

— 3 —

ON F6

CUT

ON UP 3

ON 5/4 2

ON 5/4 1

ON 5/4 0

ON 5/4

ADD

ON 5/4

ADD

PRINT5/4

ADD

1TM

809% /

+–

•5

M+

M–

M+

÷5MU

✽

CA 1÷ ÷ 1=

0.123

0.01

0.123

0.1

0.12

0.124

0.1234

0.123456

0.1234567

-888.88888888

-888.888888888

1000

–

8 8 8 • 8 8 8 8 8 8 8

4.DIAGNOSTICS

PW FDOPERATION DISPLAY PRINT OUT

— 4 —

-0.03

PRINT5/4

ADD

PRINT5/4

ADD

ITEM5/4

ADD

ITEM5/4

ADD

+/– +

ITEM5/4

ADD

+/– +

ITEM5/4

ADD

✽

+/– +

ITEM5/4

ADD

+/– +

OFF F6

-0.03

-0.02

001

No Display

·1–1–

–

✽

• • 0 • •

1 • ÷÷

1 • ÷

0 • 0 1 ÷

1 • =

0 • 0 1

0 • 0 1 ×

– 1 • =

– 0 • 01 +

– 0 • 0 2 ◊

0 • 0 1 –

0 0 2

– 0 • 0 2 ◊

0 0 1

0 • 0 1 –

0 0 1

– 0 • 0 3

✽

– 0 • 0 3 G✽

PW FDOPERATION DISPLAY PRINT OUT

— 5 —

3. OPERATION CHECK

NO. OPERATION DISPLAY NOTE

SHIFT AC

F6 ab/cAC

Press the above keys at the

same time.

No Display

== Lx375 TEST ==

1. LCD 4. ROM

2. KEY 5. TRS

3. RAM 0. rst

RESET

AC MAIN MENU

COMP BASE SD REG

MAT GRAPH EQUA PRGM

LINK CONT RESET

No Display

✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽

✽

✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽

✽

RESET

RESET ALL MEMORIES?

RESET ALLYES NO

✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽

✽

✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽

RESET

ALL MEMORIES!

✽

— 5 —

Trouble Cause Checkpoint Note

1) Does not work

at all.

2) No display.

3) No print.

4) Poor display.

5) Poor printing

• Motor does

not stop.

• Missing of

digits. •Refer to the printer service manual published separately.

VDD, VSS, VM, VF1, and

VF2 are OK?

Check the pulse signals

from LSI.

If VF1, VF2, Digit and

Segment signals are OK.

VM=17V (while printing)

Check detector of printer

block and timing signal.

Secondary voltage

of transformer

Waveforms of each

VF1, VF2

Signal D1 ~

S1 ~

Between LSI and

display tube

5. TROUBLESHOOTING

•Defective power transformer

•Defective LSI

•No voltage at VF1, VF2

•No digit signal or no segment

signal

•Defective display tube

•Poor voltage VM

•Defective motor

•Defective LSI

•Short or open circuits between

digit signals and segment sig-

nals.

•Defective display tube

•Timing signal is bad.

•Defective printer magnet

— 6 —

12 ×3

13 ×3

20 ×2

18 ×4

1097

17 15

6. DISASSEMBLY VIEW

— 7 —

OUTPUTINPUT

Power Cord

Projection side

Black

Projection side

Marking side

Brown

Blue

Brown

Blue

Transformer

Yellow

Black

Blue

Black

White

Black

Red

Connection

Voltage

100V

120V

220V

240V

24 ×2

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