Read Sharp XG-C50XE (serv.man11) Service Manual online
29
XG-C50X
TROUBLE SHOOTING TABLE
Yes
Yes
No
No
No
Yes
No
No
Yes
Yes
Yes
Lamp fails to light-up
Turn on the power switch.
Is discharging sound heard from
lamp?
Is discharging sound heard from
lamp?
Is the lamp out of socket?
Reconnect the lamp into socket.
Replace the lamp
Is the ballast cooling fan running?
Is DC 280V/400V voltage applied
between CN704 connetor pins?
between CN704 connetor pins?
Is 2V or higher voltage applied
between pins(4) and (2) of ballast's
CN705 connector.
between pins(4) and (2) of ballast's
CN705 connector.
Replace the ballast.
Check the power supply circuits.
No
Check the power supply circuits.
Is the CN705 connector
disconnected?
disconnected?
Reconnect it into socket correctly.
Check the microproccessor and its
peripheral circuits.
peripheral circuits.
30
XG-C50X
No
Other
No
Yes
No
Yes
BU5.3V
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Checking the power unit
There is no voltage output at
CN708
CN708
Which output voltage line fails?
Is AC voltage(90~264V)applied
across the CN701 connector?
across the CN701 connector?
Is AC voltage(90~264V)applied
across the CN706 connector?
across the CN706 connector?
Is the fuse F701 open?
Is the resistor R702 open?
Is the Bimetal SW open
Replace Inlet unit.
Check the Output PWB unit
Check the T703, IC703, IC705,
IC706 and their peripheral circuits.
IC706 and their peripheral circuits.
Check the CN701 or AC cord.
Is the resistor R775 open?
Replace Power unit.
Replace the R775.
Replace the F701.
Replace the R702.
Push the red button of the bimetal.
TROUBLE SHOOTING TABLE (Continued)
31
XG-C50X
TROUBLE SHOOTING TABLE (Continued)
No
No
No
No
Yes
Yes
Yes
No
Yes
Yes
No audio output
Is the audio signal outputted from
the emmitor of Q306?
the emmitor of Q306?
Is its signal inputted into pin(2) and
(15) of IC303?
(15) of IC303?
Is its signal inputted into pin(12)
and (5) or pin(3) and (13) of IC302?
and (5) or pin(3) and (13) of IC302?
Is its signal outputted from pin(14)
and (15) or pin(16) and (17) of
P3102?
and (15) or pin(16) and (17) of
P3102?
Is its signal inputted into pin(14)
and (15) or pin(16) and (17) of
SC102?
and (15) or pin(16) and (17) of
SC102?
Check the J431, J421 and their
peripheral circuits.
peripheral circuits.
Check the P301 and its peripheral
circuits.
circuits.
Check the IC303 and its peripheral
circuits.
circuits.
Check theIC302 and its peripheral
circuits.
circuits.
Check the Q304 and Q305 and its
peripheral circuits.
peripheral circuits.
Check the connection between
P3102 and SC3102.
P3102 and SC3102.
32
XG-C50X
TROUBLE SHOOTING TABLE (Continued)
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Checking the video system
Is the lamp on ?
Is specified voltage EA
connectors?
connectors?
Is the video signal inputted into the
pin (23) of P3102?
pin (23) of P3102?
Is the signal outputted from the pin
(7) of IC4502?
(7) of IC4502?
Is the signal outputted from the pin
(5) of IC4505?
(5) of IC4505?
Is the signal inputted into pin(72)
of P8002?
of P8002?
Go to "Checking the PC I/F unit".
Go to "Lamp fails to light-up".
Check power circuit and its parts.
Check the video terminal and its
peripheral circuits.
peripheral circuits.
Check IC4502 and its peripheral
circuits.
circuits.
Check IC4505 and its peripheral
circuits.
circuits.
Check Q4501 and its peripheral
circuits.
circuits.