Casio DL-220LA(GY) Troubleshooting guide

(without price)

DL-220LA(GY) (LX-226IY)

DL-250LA(GYB) (LX-226JY)

DR-120LA(WE) (LX-226AY)

SEP. 1995

DR-120LADL-220LA

INDEX

CONTENTS

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

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

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

4. TROUBLESHOOTING................................................................................................... 4

5. DIAGNOSTIC................................................................................................................. 5

6. SCHEMATIC DIAGRAM................................................................................................ 6

7. DISASSEMBLY VIEW ................................................................................................... 8

8. PARTS LIST .................................................................................................................. 9

— 1 —

1. SPECIFICATIONS

Functions: 4 basic arithmetic operations (+, -, ×, ÷), constants for ×/÷, sub-total/total/

grand total, item counting, ADD mode calculations, repeat calculations,

memory calculations, percentage calculations and various kinds of practical

calculations.

Decimal point: Full floating, and fixed (0, 1, 2, 3, 4 or 6) with round-off, round-up or cut-off.

Capacity: 12digits

Display: Digitron tube panel

Ambient temperature range: 0°C — 40°C (32°F — 104°F)

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

*Rated current and voltage are printed on the calculator.

Dimensions: 83mmH ×214mmW ×376mmD

(3 1/4"H ×8 3/8"W ×14 3/4"D) including rollholder.

Weight: 1.7kg (3.8 lbs)

— 2 —

Display tube

13-MT-31GB

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

Motor power supply

Detector power supply

VDD

GND

VSS

Segment signal

S1~S7,SAP,SDP

SO1~SO7

SI1~SI3,SI5

KO1~KO8

KI1~KI6

2. BLOCK DIAGRAM

— 3 —

3. CPU (MN158418YCY) PIN FUNCTION

Pin No.

1~7, 64

8~12

18~30

31, 32

33~39

41~43

44~56

59, 60

I/O

Out

—

I/O

—

Signal

P00~P13

P20~P22, P32, P33

IRQ

DEBIN

IRQCNT

P40

P41

P42, P43, P50~P53

P70~P73, P80~P82

P83, P90

P91~P93

PA0~PA3

P60

P61~P63

PB0~PB3

PC1~PC3

PD0~PD3

PE0

VPP

VDD

OCS1, OCS2

VSS

RST

Function

Common signal for keyboard

Key signal from keyboard

Timing pulse signal from printer

Not used

VDD (33V, 30mA)

Motor control signal

Ribbon shift signal for printer

Character selective signal for printer

Character selective signal for printer,

Segment signal for display

Segment signal for display,

Common signal for slide switch

VDD (33V, 30mA)

Signal from slide switch

Digit signal for display

GND terminal

VDD terminal

Clock signal for CPU

VSS terminal

Signal from slide switch, Reset signal

— 4 —

4. TROUBLESHOOTING

Trouble

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

Cause

• 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 signals.

• Defective display tube

• Timing signal is bad.

• Defective printer magnet

Checkpoint

Secondary voltage of

transformer

Waveforms of each pin

VF1, VF2

Signal D1 ~

S1 ~

Between LSI and

display tube

Note

VDD, VSS, VM, VF1, and

VF2 are OK?

Check the pulse signals

from LSI.

If VF1, VF2, Digit and

Segment signals are OK.

VM=11V (while printing)

Check detector of printer

block and timing signal.

Refer to the printer service manual published separately.

— 5 —

OPERATION

1 00 TM

8 – ÷9 % ◊/#

1 2 3 4 ÷

7 6 5 +

M+

M–

÷5 MU/MD

M◊

M❊

CA 1 ÷ ÷ 1 =

X 1 – 1 –

◊/#

– ❊

FEED

1• K÷

0 • 01 ÷

1 • =

0 • 01

0 • 01 X

[- 1 • =]

[- 0 • 01+]

[0 • 01-]

[0 • 01 -]

[- 0 • 02◊]

002

[- 0 • 02◊]

[0 • 01 -]

001

[- 0 • 03 ❊]

001

[- 0 • 03G❊]

Paper feeding

• • 0 • •

NOTE

The character with

"[ ]" will be printed

by red ink.

Press the button 2

or 3 seconds

continuously.

STEP

MODE SWITCHES

ON F 6

PRINT F 6

PRINT CUT 6

PRINT CUT 4

PRINT UP 3

PRINT UP 2

PRINT 5/4 1

PRINT 5/4 0

PRINT 5/4 ADDX

PRINT 5/4 ADD+

ITEM+ 5/4 ADD+

ITEM+/– 5/4 ADD+

[-]

[88.8888888888]

1.234 • ÷

765 • =

1.61307189542+

1.613071 M+

1.6131 M+

[1.614 M+]

1.614 ÷

5 • %M

0.08 -%

1.54

1.5 +

2 • +

1.613 M◊

1.613 M*

• • 0 • •

1 • ÷

▲

DISPLAY

100.

-888.888888888

-888.88888888

1234.

1.61307189542

M 1.613071

M 1.6131

M 1.614

M 1.54

M 3.1

M 5.

1.613

K 0.01

-0.02

-0.03

5. DIAGNOSTIC

— 6 —

6. SCHEMATIC DIAGRAM

6-1. Main Board

— 7 —

6-2. Key Matrix

—8—

7. DISASSEMBLY VIEW

21 19

OUTPUT

24 ×2

INPUT

Power Cord

Black

Projection side

Marking side

Brown

Blue

Brown

Blue

Transformer

Black

Yellow

Blue

Black

White

Black

Red

Connection

Voltage

100V

120V

220V

240V

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