Star Micronics NX-1500 - Repair by Parts Replacement

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TROUBLESHOOTING
1) Replace main logic board.
2) Replace printer mechanism.
A
NO
Print head
drive signal waveform is
normal? *3
YES
Replace printer mechanism.
NO
NO
C
NO
NO
A
Paper feed
motor drive waveform is
normal? *2
YES
Replace printer mechanism.
Printing operation
is normal?
YES
Paper feed
operation is
normal?
YES
Ribbon feed
operation is
normal?
YES
Self printing terminates.
Check host computer
connection.
Power is off and I/F cable is
connected.
Power is on.
Print program operation
begins from host computer.
A
1) Replace ink ribbon.
2) Replace printer mechanism.
1) Replace main logic board.
2) Replace printer mechanism.