Service manual

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