Star Micronics NX-1020 - Defective Print Head Operation

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TROUBLESHOOTING
4-4. Defective Print Head Operation
A specific
pin does not
work?
NO
Print is light
as whole?
NO
Power supply
unit abnormal.
(Refer to item 4-2.)
Check and replace
1) Gate array
2) CPU
NO
NO
NO
YES
YES
Check and replace
1) TR19, TR20
2) TR10 ~ TR18
Adjust gap
(Refer to Chapter 3.)
*8 See (4) waveform in item 10 of Chapter 7.
START
Does not
print at all?
YES
+25V
line is
supplied?
YES
Check and replace
1) TR9
2) TR8
3) Gate array
Head
energizing control
signal is normal?
*8
YES
Check and replace
1) Print head
END