Casio DR-120XA, DL-220BAGY, DR-320A Service Manual
DR-120XA (LX-224C/D)
INDEX
DL-220BAGY(LX-224I)
DR-320A (LX-224B)
SEP. 1995
(without price)
DR-120XA
R
CONTENTS
1. SPECIFICATIONS ......................................................................................................... 1
2. BLOCK DIAGRAM ........................................................................................................ 1
3. CPU (MN15418YCY) PIN FUNCTION........................................................................... 2
4. DIAGNOSTIC................................................................................................................. 3
5. TROUBLESHOOTING................................................................................................... 4
6. DISASSEMBLY VIEW ................................................................................................... 5
7. SCHEMATIC DIAGRAM................................................................................................ 6
8. PARTS LIST ................................................................................................................ 10
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
Slide switch
Keyboard
Sent signal
S1~S7, SAP, SDP
SO1~SO7
SI1~SI3, SI5
KO1 ~ KO8
KI1 ~ KI6
Display tube
FG138AW7
CPU
MN158418YCY
VDD, VSS
Digital signal
D1~D13
Ribbon shift signal
Character selective signal
Timing pulse
Motor control signal
VF1,VF2
Printer
M-80
VIM, VDD
Power supply
circuit
— 1 —
3. CPU (MN158418YCY) PIN FUNCTION
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 IR Q 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 O ut 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, Ou t Digit signal for display
PC0~PC3,
PD0~PD3,
PE0
57 VPP In GND terminal
58 VDD In VDD terminal (+33V)
59, 60 OSC1, OSC2 I/O Clock signal for CPU
61 VSS In VSS terminal (+28V)
62 SYNC — Not used
63 RST In Signal from slide switch, Reset signal
— 2 —
4. DIAGNOSTICS
STEP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
MODE SWITCHES
ON F 6
ON F 6
ON F 6
ON F 6
ON CUT 6
ON CUT 6
ON CUT 6
ON CUT 4
ON UP 3
ON 5/4 2
ON 5/4 1
ON 5/4 0
ON 5/4 ADDX
ON 5/4 ADDX
PRINT 5/4 ADDX
OPERATION
1 00 TM
C
8 – ÷ 9 % ◊/#
▲
CA
• 1 2 3 4 5 6 7
M+
M+
M–
÷ 5 MU/MD
+
=
+
=
M◊
M❊
CA 1 ÷ ÷ 1 M
DISPLAY
100°
-88.8888888888
-88.888888888
0.1234567
M 0.123456
M 0.1234
M 0.124
M 0.12
M 0.1
M 0.
M 0.123
0.123
M 0.01'
K
PRINT
0.
[-]
[88.8888888888]
0.
0 • 01 ÷
0 • 01M+
NOTE
The character with
"[ ]" will be printed
by red ink.
• • 0 • •
1 • ÷
1 • K÷
1 • =
PRINT 5/4 ADD+
16
PRINT 5/4 ADD+
17
18
ITEM+ 5/4 ADD+
ITEM+/– 5/4 ADD+
19
ITEM+/– 5/4 ADD+
20
ITEM+/– 5/4 ADD+
21
22
ITEM+/– 5/4 ADD+
ITEM+/– 5/4 ADD+
23
24
ITEM+/– 5/4 ADD+
X 1 – 1 –
◊/#
◊/#
–
IT
❊
G❊
FEED
M❊ AC
— 3 —
M -0.02
M -0.02
M -0.02
M -0.03
M 001
M -0.03
M -0.03
0.
0 • 01 X
[- 1 • =]
[- 0 • 01 +]
[0 • 01-]
[0 • 01-]
[- 0 • 02 ◊]
002
[- 0 • 02◊]
[-0 • 01-]
001
001
[- 0 • 03 G❊]
001
[- 0 • 03 G❊]
Paper feeding
001
0 • 01M❊
• • 0 • •
Press the button 2
or 3 seconds
continuously.
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