Sharp XG-P10XU Service Manual page 36

XG-P10XU
TROUBLE SHOOTING TABLE
Checking the video system
Is the lamp on?
Is specified voltage fed to EA
connectors?
Are there signal inputs at pins (7), (9)
and (25) of SC401?
Are there signal outputs at pins (7) of
IC6010 and (5) of IC6009?
Yes
Go to "Checking IC801
(RGB signal output circuit)".
Checking the video unit circuit
Is there video signal output at pin (7)
of IC401?
Yes
Is there video signal input at IC4001?
Yes
Are there signal outputs at pins (6)
and (8) of IC4001?
Yes
Check the low-pass and buffer circuits
of Q6002 thru Q6008. Is the signal as
specified?
Yes
Go to "Checking IC801 (RGB signal
output circuit)".
No
Yes
No
Yes
No
Yes
No
Check IC6001, IC6010,
IC6009 and their peripheral
circuits as well as switching
circuit.
No
Check the IC401 selector switch,
terminal voltage and input circuit.
No
Check the low-pass and buffer
circuits of Q4002 thru Q4012.
No
Check IC4001 and its peripheral
circuits (bias).
No
Check Q4007 thru Q4009 and their
peripheral circuits.
36
(Continued)
Go to "Lamp fails to light-up".
Check the power circuit and its parts.
Are there signals at pin (4) of IC6011?
Yes
Check the video unit circuit Check the oscillation circuit
(IC4501 and IC4001 and its of IC6011, and their
peripheral circuits). peripheral circuits.
No