Sharp DT-400, Service Manual

Page: 37 / 156

37
XV-Z2000
DT-400
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 Q9401 to Q9403,
IC9401(motor driver IC)
and their peripheral circuits.
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 Q8002, Q8006 and
their peripheral circuits.
NO
YES
NO
ABNORMAL
YES
NORMAL
YES NO
YES NO
NO YES
YES
NO