Sharp XG-MB70X Service Manual page 35

Checking the power unit
Is each connector of the power unit
fully inserted?
YES
Is the lamp door closed completely?
YES
Is the bimetal broken?
YES
Is AC voltage applied to both AC input
ends of DB701?
YES
Is DC voltage of approx. 6.25V output
to both ends of C726?
YES
Is DC voltage of approx. 370V output to
the cathode of D701?
YES
Is the specified voltage output to each
output terminal of EA701?
YES
Check the PWB circuits on each output
side.
NO
Securely insert the connectors.
NO
Fix the lamp door with screws.
NO
Replace the bimetal switch or restore
by pressing the red button.
NO
Replace F701. If other parts are
damaged, replace them.
Check D707 and the peripheral circuits
NO
of IC702 on the primary side. If
defective, replace them.
NO Replace the subunit or check the
primary side circuit.
Replace defective parts if any.
NO
Check the secondary-side circuits of
T701. If defective, replace them.
Replace the ballast power supply.
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XG-MB70X
ABNORMAL