FLOW CHART
SECTION 4.
TROUBLESHOOTING FLOW CHART
When changing the parts which are broken first, remove the power plug from the socket and then discharge the
voltage across the terminals of C807 (use an external 1K
Ω
(2W) resistance).
When check the primary circuit, Use the oscilloscope isolated properly (Use the isolated transformer) and connect
GND to the primary GND, however it is not necessary to isolate the oscilloscope when check the secondary circuit.
A. CHECKING THE PRIMARY CIRCUIT.
4-1. Power Circuit
No output Voltage.
Prepare the oscilloscope
connected the isolated
transformer
Check F801 Fuse.
Is 5.7 voltage applied to
IC11 control pin
Check the secondary circuit
Is voltage applied to D801?
Is voltage applied to the
terminals of C807?
Is varation between 5.7V
and 4.8V at IC11 control pin
Check L801, L802
Check R803, D801
NO
NO
NO
NO
Check T11 :
3
~
6
pin,
L12 and IC11
YES
YES
YES
YES
YES
YES
24
Содержание DV-K88 series
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