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XG-P25X
TROUBLE SHOOTING TABLE (Continued)
Checking the video system
Is the lamp on?
No
Yes
Go to "Lamp fails to light-up". Is specified voltage fed to EA connectors?
No
Yes
Check the power circuit and its parts. Are there signal inputs at pins (9), (19) and (21) of SC401?
No
Yes
Are there signals at pin (7) of IC5555? Are there signal outputs at pins (1),(12) and (14) of SC4303?
No No
Yes
Check SC4303,P4303 and their peripheral circuits. (Go to "Checking the output PWB unit".)
Check the IC5555 and its peripheral circuits.
Check IC4311, IC4502, IC4501and their peripheral circuits.
Checking the video unit circuit
Is there video signal output at P401 pin (9).
No
Yes
Check the IC5555 selector switch, terminal voltage and input circuit.
Is there video signal input at pins (76) and (88) of IC4502?
No
Check the low-pass and buffer circuits of Q4501,Q4502,and Q4508,Q4509.
Yes
Are there signal outputs at pins (83) and (84) of IC4502?
No
Yes
Check IC4502,IC4503 and their peripheral circuits (bias).
Check the buffer circuits of Q4503 thru Q4504. Is the signal as specified?
No
Yes
Check Q4503 thru Q4504 and their peripheral circuits.
Check IC4501,IC4311and their peripheral circuits. (Go to "Checking the output PWB unit".)
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