Sharp XG-P20XU Bedienungsanleitung Seite 37

TROUBLE SHOOTING TABLE
Checking the video system
Is the lamp on?
Yes
Is specified voltage fed to EA
connectors?
Yes
Are there signal inputs at pins (9),
(19) and (21) of SC401?
Yes
Are there signal outputs at pins
(1),(12) and (14) of SC4303?
Yes
Check IC4311, IC4502,
Check SC4303,P4303 and
IC4501and their peripheral
their peripheral circuits.
circuits.
(Go to "Checking the output
PWB unit".)
Checking the video unit circuit
Is there video signal output at P401
pin (9).
Yes
Is there video signal input at pins
(76) and (88) of IC4502?
Yes
Are there signal outputs at pins (83)
and (84) of IC4502?
Yes
Check the buffer circuits of Q4503
thru Q4504. Is the signal as
specified?
Yes
Check IC4501,IC4311and their
peripheral circuits.
(Go to "Checking the output
PWB unit".)
No
No
No
No
No
Check the IC5555 selector switch,
terminal voltage and input circuit.
No
Check the low-pass and buffer
circuits of Q4501,Q4502,and
Q4508,Q4509.
No
Check IC4502,IC4503 and their
peripheral circuits (bias).
No
Check Q4503 thru Q4504 and their
peripheral circuits.
37
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(Continued)
Go to "Lamp fails to light-up".
Check the power circuit and its parts.
Are there signals at pin (7) of IC5555?
Check the IC5555 and its
peripheral circuits.
XG-P20XU
XG-P20XE
XG-P20XD
No