Mitsubishi Electric XD8100U Service Manual page 82

Power source system 3
Lamp doesn't illuminate.
Is the color wheel
rotating?
Yes
Is the lamp
illumination signal output?
Check that the 3-pin and 8-pin of the SA
connector is 5V and the 4-pin and
9-pin is 0.7V or less.
Yes
Is L370V
(DC370V on the primary side)
output? (Between 1-pin and 3-pin of
the PA connector and between
1-pin and 4-pin of the
PB connector)
Yes
Failure in the Lamp Power Unit.
Failure in the MAIN PCB ASSY,
No
FORMATTER PCB ASSY, DMD
PCB ASSY, or color wheel.
Failure in IC740, IC800 or the
No
peripheral circuit.
(MAIN PCB ASSY)
No
Failure in the PFC PCB ASSY.
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