Service manual

30
PG-M20S
PG-M20X
No
Lamp failure to light up
(formatter unit)
Yes
Is there the specified voltage at
pin (15) of SC9002?
No
Is there the 180-Hz pulse signal at
pin (1) of P9002?
Is any of the SC9001, SC9002,
P9002 and P9003 connectors
disconnected or in poor contact?
Yes
Insert the connectors completely.
No
Is there the specified voltage at
pin (11) of P3002?
No
Check the fan circuit
(near IC2101) on the
KEY PWB.
No
Check the power unit.
Are there the specified voltages
at pins (23) and (24) of P3003 on
the input PWB?
Go to "Checking of PC I/F unit"
Yes
Yes
Check the lamp and ballast unit.
Yes
Is the signal at pin (10) of IC9101
at High level?
No
Are the signals at pins (69) and
(70) of SC9001 at High level?
Yes
No
Yes
Is the signal at pin (9) of IC9101
at High level?
No
Trouble with IC9003.
Trouble with IC9101 or its
peripheral part.
Yes
Is there the 180-Hz pulse signal at
pin (2) of P9003 when no input
signal is given?
No
Yes