Star Micronics NX-1500 - Defective Print Head Operation

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TROUBLESHOOTING
A specific
pin does not
work?
NO
Print is light
as whole?
NO
Check or replace
1) TR8 ~ TR16
Adjust gap
(Refer to chapter 3.)
Power supply
unit abnormal.
(Refer to item 4-2.)
Check or replace
1) Gate array
2) CPU
NO
NO
NO
YES
YES
START
Does not
print at all?
YES
VH(+25.5V)
line is
supplied?
YES
Check or replace
1) TR1
2) Gate array
Head
energizing control
signal is normal?
*3
YES
Check or replace
1) Print mechanism
END
4-4. Defective Print Head Operation