— 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
pin
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
Summary of Contents for DR-1212LA
Page 1: ...R PR 420A ZX 516C DR 1212LA ZX 516D DEC 1995 without price INDEX ...
Page 9: ... 6 12 3 13 3 20 2 18 4 10 9 7 8 6 19 5 21 1 17 15 14 16 11 6 DISASSEMBLY VIEW ...
Page 11: ... 8 4 2 3 ...
Page 12: ... 9 7 SCHEMATIC DIAGRAM 7 1 Main PCB ZX 516 ...
Page 13: ... 10 7 2 Key Matrix ...
Page 15: ... 12 8 PARTS LIST ...
Page 16: ... 13 ...
Page 17: ...8 11 10 Nishi Shinjuku Shinjuku ku Tokyo 160 Japan Telephone 03 3347 4926 ...