Defective Print Head Operation. Star Micronics LC-200, NX-1020

TROUBLESHOOTING

4-4. Defective Print Head Operation

START

Does not print at all?

YES

+25V line is supplied?

YES

NO

NO

Power supply unit abnormal.

(Refer to item 4-2.)

Check and replace

1) TR9

2) TR8

3) Gate array

Head energizing control signal is normal?

*8

YES

NO

Check and replace

1) Gate array

2) CPU

Check and replace

1) Print head

END

A specific pin does not work?

NO

YES

Check and replace

1) TR19, TR20

2) TR10 ~ TR18

Print is light

as whole?

NO

YES

Adjust gap

(Refer to Chapter 3.)

*8 See (4) waveform in item 10 of Chapter 7.

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