Sharp PG-C20XU Service Manual page 34

PG-C20XU
PG-C20XE
AN-Z7T
Checking the PLL circuit
Is there 120MHz clock
output at pin (8) of
IC8001?
YES
Is there 40MHz clock
output at pin (9) of
IC8001?
YES
Is there 16MHz or so
clock output at pin (7) of
IC8001?
YES
End
Checking the lamp
light-up
Turn on the power switch.
Is discharge sound heard
from the lamp?
NO
Are DC260-400V voltages
applied between the pins
of PL connector?
YES
Is the BA harness tightly
inserted? Is the harness
broken?
YES
Is voltage of over 1V
applied between pins (1)
and (2) of BA harness?
YES
Replace the ballast unit.
NO
NO
NO
IC8001 or its peripheral
circuit defective.
YES
Is the lamp socket
disconnected?
Reconnect the lamp
socket tightly.
NO
Go to "Checking the
power unit".
NO
Insert the BA harness
tightly. Or replace it as
required.
NO
Go to "Checking the
microcomputer
peripherals".
34
NO
YES
Replace the lamp.