Defective Print Head Operation - Star Micronics NX-1020 Technical Manual

TROUBLESHOOTING

4-4. Defective Print Head Operation

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
NO
NO
Power supply
unit abnormal.
(Refer to item 4-2.)
NO
Check and replace
1) Gate array
2) CPU
*8 See (4) waveform in item 10 of Chapter 7.
A specific
pin does not
work?
NO
Print is light
as whole?
NO
– 68 –
YES
Check and replace
1) TR19, TR20
2) TR10 ~ TR18
YES
Adjust gap
(Refer to Chapter 3.)