Repair By Parts Replacement; Does Not Operate At All With Power On - Star Micronics LC-4511 Technical Manual

4.

Repair by Parts Replacement

4-1. Does not Operate at All with Power on

START
+33/40V, +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 Power Supply Unit
LC-4511 +33V Line +33V ± 5%
LC-4521 +40V Line +40V ± 5%
+5V Line +5V ± 5%
See 4-2. Power Supply
Circuit Abnormal.
Between Pin 4 and Pin 5 of CN1
Between Pin 1 and Pin 2 of CN1
– 63 –
TROUBLESHOOTING