XG-MB70X (serv.man13). Troubleshooting - Sharp Projector Service Manual (repair manual). Page 5

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37
XG-MB70X
Checking the lamp light-up
Does each cooling fan 
function?
Check the power supply circuit 
or fan circuit on the main circuit.
Is the rotating sound of the 
color wheel heard?
Check IC9102, 9003 and 
the peripheral circuits of 
the motor driver IC 
IC9101.
Go to "Checking the 
peripheral circuits of 
the formatter".
Replace the color wheel.
Is the discharging sound 
(high voltage) heard?
Is the lamp tight in the 
socket?
Replace the lamp.
Securely insert the 
connectors.
Is DC voltage of approx. 
370V applied to both ends 
of the ballast power supply?
Is pin (2) of P1707 at the 
H level?
Go to "Checking the 
power unit".
Go to "Checking the 
peripheral circuits of the 
Check IC1701, IC2003 and 
their peripheral circuits.
NO
YES
NO
ABNORMAL
YES
NORMAL
YES
NO
YES
NO
NO
YES
YES
NO
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