Sharp PG-M20S Service Anleitung Seite 30

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