Star Micronics LC-8521, Technical Manual

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4-4. Defective Print Head Operation
NO
NO
NO
*14 See (4) waveform in item 5 of Chapter 6.
START
Does not
print at all?
YES
+40V line
is supplied?
YES
Check and replace
1) Power supply unit
(Refer to item 4-2.)
Check and replace
1) Gate array
2) CPU
Check and replace
1) TR10 ~ TR14
2) Gate array
Head
energizing control
signal is normal?
*14
YES
Check and replace
1) Print head
END
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)
Adjust gap
(Refer to Chapter 3.)
A specific
pin does not
work?
NO
Print is light
as whole?
NO
YES
YES