Casio ZX-510IY Manuale di servizio - Pagina 6

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4. TROUBLESHOOTING

Trouble

1) Does not work

• Defective power transformer

at all.

• Defective LSI

2) No display.

• No voltage at VF1, VF2

• No digit signal or no segment

signal

• Defective display tube

• Poor voltage VM

3) No print.

• Defective motor

• Defective LSI

4) Poor display.

• Short or open circuits

between digit signals and

segment signals.

• Defective display tube

5) Poor printing

• Timing signal is bad.

• Motor does

not stop.

• Defective printer magnet

• Missing of

digits

• Refer to the printer service manual published separately.

Cause

Secondary voltage of

transformer

Waveforms of each pin

VF1, VF2

Signal D1 ~

Between LSI and

display tube

— 4 —

Checkpoint

VDD, VSS, VM, VF1, and

VF2 are OK?

Check the pulse signals

from LSI.

S1 ~

If VF1, VF2, Digit and

Segment signals are OK.

VM=11V (while printing)

Check detector of printer

block and timing signal.

Note