Defective Print Head Operation - Star Micronics LC-4511 Technical Manual

TROUBLESHOOTING

4-4. Defective Print Head Operation

START
Does not
print at all?
YES
+33/40V line
is supplied?
YES
Check and replace
1) TR12 ~ TR16
2) Gate array
Head
energizing control
signal is normal?
*7
YES
Check and replace
1) Print head
END
NO
NO
Check and replace
1) Power supply unit
(Refer to item 4-2.)
NO
Check and replace
1) Gate array
2) CPU
*7 See (4) and (5) waveform in item 7 of
Chapter 7.
A specific
pin does not
work?
NO
Print is light
as whole?
NO
– 66 –
YES
Check and replace
• TA1 (HD1, 2, 3, 4)
• TA2 (HD5, 6, 7, 8)
• TA3 (HD9, 10, 11, 12)
• TA4 (HD13, 14, 15, 16)
• TA5 (HD17, 18, 19, 20)
• TA6 (HD21, 22,23, 24)
YES
Adjust gap
(Refer to Chapter 3.)