Start
Replace Fuse & Find out
its root cause
Normal
YES
Check the connector
NO
Replace Fuse: 250V 2A
YES
Check PCB pattern &
Replace BD1
NO
Replace PCB ASS'Y
NO
1)
Replace D103 (F10NC15M)
2) Replace PCB ASS'Y
NO
Replace REG1(7805CT)
NO
1) Check the connector
2) Replace PANEL PCB
NO
1) Replace the relevant relay
2) Check LEAD WIRE contact
NO
Replace MAIN PCB
NO
NO
YES
NO
YES
YES
YES
YES
YES
YES
YES
TROUBLE SHOOTING
4-2-1-1) When there is no power (AC COMP model)
Is the 230V AC fuse
blown?
Is 230V applied
at the both of the SMPS PCB
CN1 terminals?
Is the fuse on SMPS
PCB blown?
Is DC300V applied at
BD1+ & - terminals?
Is DC5.8V applied
at TOP S/W TOP246Y
C-S?
Is 12V applied at
C102?
Is 5V applied at
C103?
Does PANEL PCB
operate normally?
Do the components
such as the relays
work properly?
Is there short-out
soldering on PCB?
64