Sharp XG-MB70X, Service Manual

Page: 37 / 161

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
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
formatter".
Check IC1701, IC2003 and
their peripheral circuits.
NO
YES
NO
ABNORMAL
YES
NORMAL
YES NO
YES
NO
NO YES
YES
NO