Read Sharp XG-MB70X (serv.man13) Service Manual online
37
XG-MB70X
Checking the lamp light-up
Does each cooling fan
function?
function?
Check the power supply circuit
or fan circuit on the main circuit.
or fan circuit on the main circuit.
Is the rotating sound of the
color wheel heard?
color wheel heard?
Check IC9102, 9003 and
the peripheral circuits of
the motor driver IC
IC9101.
the peripheral circuits of
the motor driver IC
IC9101.
Go to "Checking the
peripheral circuits of
the formatter".
peripheral circuits of
the formatter".
Replace the color wheel.
Is the discharging sound
(high voltage) heard?
(high voltage) heard?
Is the lamp tight in the
socket?
socket?
Replace the lamp.
Securely insert the
connectors.
connectors.
Is DC voltage of approx.
370V applied to both ends
of the ballast power supply?
370V applied to both ends
of the ballast power supply?
Is pin (2) of P1707 at the
H level?
H level?
Go to "Checking the
power unit".
power unit".
Go to "Checking the
peripheral circuits of the
peripheral circuits of the
Check IC1701, IC2003 and
their peripheral circuits.
their peripheral circuits.
NO
YES
NO
ABNORMAL
YES
NORMAL
YES
NO
YES
NO
NO
YES
YES
NO
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