Page 1
PR-420A (ZX-516C)
DR-1212LA (ZX-516D)
DEC. 1995
(without price)
R
Page 2
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
Page 3
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
Sa ~ Sg, SAP, SDP
SO1 ~ SO7
SI1 ~ SI3, SI5
KO1 ~ KO8
KI1 ~ KI5
Display tube
13-LT-09G
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 —
Page 4
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 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
— 2 —
Page 5
4.DIAGNOSTICS
PW F D OPERATION DISPLAY PRINT OUT
00
ON F 6
1
TM
100
0
ON F 6
ON F 6
ON F 6
CUT
ON
CUT
ON
ON
CUT
CUT
ON
ON UP 3
C
0.
÷
0
8
9
% /
+
–
-888.888888888
/#
-888.88888888
CA
6
1
•
6
6
7
M+
6
M+
4
3
2
M–
5
4
0.1234567
M
0.123456
M
M
0.
0.1234
0.124
ON 5/4 2
ON 5/4 1
ON 5/4 0
ON 5/4
ON 5/4
PRINT5/4
ADD
×
ADD
×
ADD
×
÷
+
+
M
M
CA
MU
5
MD
✽
÷ ÷
1
=
1
— 3 —
M
M
M
M
0.12
0.1
0.
0.123
0.123
K
0.01
–
8 8 8 • 8 8 8 8 8 8 8
Page 6
PW F D OPERATION DISPLAY PRINT OUT
PRINT5/4
PRINT5/4
ADD
+
ADD
+
·
/#
–
1
–
1
-0.02
-0.02
• • 0 • •
0 • 0 1 ÷
ITEM5/4
++
ADD
/#
-0.02
0 • 0 1
1 • ÷
1 • ÷ ÷
1 • =
ITEM5/4
+/– +
ITEM5/4
+/– +
ITEM5/4
+/– +
ITEM5/4
+/– +
OFF F 6
ADD
ADD
ADD
ADD
–
-0.03
0 • 0 1 ×
– 1 • =
IT
001
– 0 • 01 +
0 • 0 1 –
✽
-0.03
– 0 • 0 2 ◊
0 0 2
G
✽
– 0 • 0 2 ◊
-0.03
0 • 0 1 –
0 0 1
No Display
0 0 1
– 0 • 0 3
✽
0 0 1
– 0 • 0 3 G✽
— 4 —
Page 7
3. OPERATION CHECK
✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽
✽
✽
✽
✽
✽
✽
✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽
RESET
ALL MEMORIES!
✽
✽
✽
✽
✽
✽
NO. OPERATION DISPLAY NOTE
1
2
3
AC
RESET
F1
MAIN MENU
COMP BASE SD REG
MAT GRAPH EQUA PRGM
LINK CONT
RESET
✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽
✽
✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽✽
RESET ALL MEMORIES?
RESET
RESET ALLYES NO
✽
SHIFT AC
4
F6 ab/c AC
Press the above keys at the
same time.
5
1
6
No Display
== Lx375 TEST ==
1. LCD 4. ROM
2. KEY 5. TRS
3. RAM 0. rst
No Display
— 5 —
Page 8
5. TROUBLESHOOTING
Trouble Cause Checkpoint Note
1) Does not work
at all.
• Defective power transformer
Secondary voltage
of transformer
VDD, VSS, VM, VF1, and
VF2 are OK?
2) No display.
3) No print.
4) Poor display.
5) Poor printing
• Motor does
not stop.
• 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.
Waveforms of each
pin
VF1, VF2
Signal D1 ~
S1 ~
Between LSI and
display tube
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.
• Missing of
digits.
• Defective printer magnet
• Refer to the printer service manual published separately.
— 5 —
Page 9
6. DISASSEMBLY VIEW
6
19
5
21
8
12 × 3
1097
13 × 3
20 × 2
18 × 4
1
17
15
14
11
— 6 —
16
Page 10
Voltage
100V
120V
220V
240V
Connection
Power Cord
Projection side
Black
Projection side
Marking side
Brown
Blue
Brown
Blue
Transformer
Yellow
Black
Blue
Black
Black
White
Black
Red
22
23
— 7 —
25
26
OUTPUTINPUT
24 × 2
Page 11
4
2
— 8 —
3
Page 12
7. SCHEMATIC DIAGRAM
7-1. Main PCB (ZX-516)
— 9 —
Page 13
7-2. Key Matrix
— 10 —
Page 14
7-3. Printer Pin Arrangement Diagram
Connection Pin No. ConnectionPin No.
RD terminal
1
Character selective
15
magnet column No.1
(Not used)
Character selective
magnet column No.1
2
3
4
5
6
7
8
9
10
10
11
12
2
3
4
16
17
18
13
14
15
Notes:
1. Column numbers match
5
19
16
the physical arrangement of the columns on
the print wheels.
6
20
17
2. Column numbers are assigned from 1 to 18 from
Ribbon shift magnet
7
21
the frame motor side.
3. Pin numbers are assigned from 1 to 27 from
8
22
Electromagnet (+)
the frame motor side.
4. The spark arrestor diode
is connected as shown
9
M
23
Motor power
supply (+)
24
Detector power
supply (+)
Timing signal
25
Detector power
26
supply (–)
below.
Electromagnet (+) Driver
(Example of compatible diode:
1S2075K or equivalent)
Motor power
11
13
27
supply (–)
14
12
Motor power ON/OFF
Timing signal
Character selective magnet No.n
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12
*2
8.0ms min. 2.0ms min.
0.7ms max.0.7ms max.
0.7ms max.0.7ms max. 80.0ms min.
8
0.2ms max.
*1
TS T(0)
Ribbon shift magnet
(Print operation)
(Normal paper feeding operation)
Typ. 285.7ms
Notes:
1. The signals in must be prepared by the user.
2. The pulse is indicated by a dot-dash line (*1) is generated for continuous printing. The next print cycle can start
immediately after the leading edge of the timing signal Ts.
3. As shown by a dashed line (*2), the timing signal may go low at motor power-on or upon reception of a Print command.
— 11 —
Page 15
8. PARTS LIST
— 12 —
Page 16
— 13 —
Page 17
8-11-10, Nishi-Shinjuku
Shinjuku-ku, Tokyo 160, Japan
Telephone: 03-3347-4926
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