Star Micronics NX-1000 series - Repair by Parts Replacement Flowcharts

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TROUBLESHOOTING
4. Repair by Replacement of Parts
4-1. Does not Operate at All with Power on
DC Power abnormal.
Check RESET circuit;
replace parts.
Check crystal circuit;
replace parts.
1) Replace CPU or ROM.
2) Check relevant circuit.
NO
NO
NO
NO
See 4-2. Power Supply
Unit Abnormal.
START
+24V
and +5V are
supplied? *4
YES
RESET
signal becomes
HIGH? *6
YES
Crystal
waveform is
normal? *1
YES
ROM OE
signals become
LOW?
YES
Carriage motor abnormal.
Check operation.
END