SECTION 3.
TROUBLE SHOOTING FLOW CHART
3-1. POWER CIRCUIT
• When change the parts which are out of order, first, remove the power plug from the socket and then discharge the
voltage across between both terminals of C807. (Use an external scores of K
Ω
resistance)
• When check the primary circuit by using the oscilloscopes insulate the oscilloscope surely (Use the isulating transformer)
and must connect GND into the primary GND (But there is no connection when check the secondary circuit).
• When change IC801, check FUSE and Cement resistance surely.
13
Prepare the instrument
connecting the insulating trans.
Is F801 fuse opened?
Have the noise been heard
in the trans?
Is the value of registor
R806 (0.68 ) normal?
Check L801, D801 and C806.
NO
NO
YES
YES
YES
NO
NO
YES
YES
NO output Voltage.
A. CHECKING THE PRIMARY CIRCUIT.
Change F801.
YES
Change.
NO
YES
Is voltage applied to D801?
A
A
B
Is the power trans normal?
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