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TROUBLE SHOOTING FLOW CHART
SECTION 3.
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 KΩ 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.
A. CHECKING THE PRIMARY CIRCUIT.
connecting the insulating trans.
Is voltage applied to D801?
NO output Voltage
YES
Prepare the instrument
YES
Check F801 FUSE
YES
YES
Is voltage applied to the
both terminals of C807?
YES
Check power module
NO
Check D801, L801 & L802
NO
16
Check R802
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