NO
YES
The unit does not start even if the power is turned on (the front LED does not light up).
Is the power supply cord properly connected to the main unit? Reconnect the power supply cord and turn on the power.
NO
Are the wire harness, FFC, etc. in the set connected properly? Reconnect the wire harness, FFC, etc. and recheck.
NO
YES
YES
NO
Is output voltage of BU+15V line (pin 2 of PG terminal) normal? Is there any broken part or short circuit on the BU+15V line?
Remove the broken part or short circuit and recheck.
Check the BU+15V system power supply circuit.
(D7002-3, NTC7001, Q7901, Q7902, Q7903, Q7904,
D7904, D7905)
NO
YES
YES
Is F7003 normal? If fuse burns out when F7003 is replaced and the power is turned on again, replace IC7901 and D7910, and
recheck them.
YES
NO
Is voltage (approx. 350V) generated at C6101 and C6301 when powered on? Check the PFC circuit.
(Q7101, Q7102, D7101, D7107, IC7101)
YES
NO
Is voltage generated at INV24V immediately after powered on? Check the INV24V system power supply circuit.
(Q6101, Q6120, D6151-3, PC6101, IC6151)
YES
NO
Is voltage generated at the UR13V line immediately after powered on? Check the UR13V system power supply circuit.
(Q6301, Q6320, D6351-3, PC6301, IC6351)
NO
Is F7801 normal? If fuse burns out if F7801 is replaced and the power is turned on again, replace VA7801, C7801, C7001, D7001,
Q7101, and Q7102, and recheck them.
•Power switch: Top panel
(Main) Power (DC cutoff: Detected by microprocessor)
[Scheme of power supply system]
POWER-KEY
Seine
Main
Monitor microprocessorBackup
PS-ON
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