DAEWOO ELECTRONICS DV-F562 Series, Руководство по обслуживанию

Страница: 11 / 65

18
Check each voltage on
M801(SMPS Modute)
Check voltage
C851, C856,
C853, C855
Change of the M801
NO
Check D851, D854, Q851, Q852
NO
Check the main
PCB circuit (+6V) &
Logic PCB circuit (-24V)
YES
YES
B. CHECKING THE SECONDARY CIRCUIT. (Before secondary circuit open).
SECTION 3.
TROUBLE SHOOTING FLOW CHART
3-1. POWER CIRCUIT
• When changing 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 approximately 20K
Ω
resistance)
• When check the primary circuit by using the oscilloscopes insulate the oscilloscope properly (Use the isulating
transformer) and GND must be connected GND into the primary GND (But there is no connection when checking the
secondary circuit).
• When changing M801, check FUSE and Cement resistance properly.
17
Prepare the instrument
connecting the insulating trans.
Check F801 FUSE.
Is voltage applied to D801?
Is voltage applied to the
both terminals of C807?
Check D801, L801 & L802.
Check R802 &
M801(SMPS Module)
Check the Secondary circuit.
NO
NO
YES
YES
YES
YES
YES
NO output Voltage.
A. CHECKING THE PRIMARY CIRCUIT.