Sharp PG-M20XU Service Manual page 31

Lamp does not light up.
Yes
Is the cooling fan rotating?
Yes
Is the color wheel rotating sound
heard?
Yes
Is the lamp discharging sound
heard?
No
Is DC 340V voltage applied across
the ballast power?
Yes
Go to "Lamp failure to light up
(formatter unit)".
No
Check the power circuit or the fan
circuit on the key/input PWB.
Check IC3101, the motor driver
No
circuit and their periphery.
Check the waveform of SC3101.
Normal
Replace the color
wheel.
Yes
Check the socket
No
Check the power circuit.
31
Abnormal
Check the
formatter PWB.
No
Replace the lamp.
PG-M20S
PG-M20X