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
NO
DC Power abnormal.
NO
Check RESET circuit;
replace parts.
NO
Check crystal circuit;
replace parts.
NO
1) Replace CPU or ROM.
2) Check relevant circuit.
*2 See (2) waveform in item 7 of Chapter 7.
*3 See (1) waveform in item 7 of Chapter 7.
*1
+33V Line
+5V Line
GENERAL SPECIFICATIONS
See 4-2. Power Supply
Circuit Abnormal.
+33V
5%
Between Pin 4 and Pin 3 of CN1
+5V
5%
Between Pin 1 and Pin 2 of CN1
– 63 –