Specifications

– 63 –
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
Circuit Abnormal.
4. Repair by Parts Replacement
4-1. Does not Operate at All with Power on
START
+33V, +5V
are
supplied? *1
YES
RESET
signal becomes
HIGH? *2
YES
Crystal
waveform is
normal? *3
YES
ROM OE
signals become
LOW?
YES
Carriage motor abnormal.
Check operation.
END
*1
VH (33V) Line +33V ± 5% Between Pin 4 and Pin 3 of CN101
VL (5V) Line +5V ± 5% Between Pin 1 and Pin 2 of CN101
*2 See (2) waveform in item 7 of Chapter 7.
*3 See (1) waveform in item 7 of Chapter 7.