Sharp XG-MB70X Service Manual page 37

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