4. TROUBLESHOOTING
TroubleCauseCheckpointNote
1) Does not workY Defective power transformerSecondary voltage ofVDD, VSS, VM, VF1, and
at all.transformerVF2 are OK?
Y Defective LSIWaveforms of each pin
2) No display.Y No voltage at VF1, VF2VF1, VF2
Y No digit signal or no segmentSignal D1 ~Check the pulse signals
signalS1 ~from LSI.
Y Defective display tubeIf VF1, VF2, Digit and
Segment signals are OK.
3) No print.Y Poor voltage VMVM=11V (while printing)
Y Defective motor
4) Poor display.Y Defective LSI
Y Short or open circuitsBetween LSI and
between digit signals anddisplay tube
segment signals.
Y Defective display tube
5) Poor printingY Timing signal is bad.Check detector of printer
Y Motor doesblock and timing signal.
not stop.
Y Missing ofY Defective printer magnet
digits
Refer to the printer service manual published separately.
N 4 N |
ACEC
