DAEWOO ELECTRONICS DQD-21OOD, Руководство по обслуживанию

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27
TROUBLESHOOTING
2. Front Circuits
No VFD Letter Display or Broken
Letter
-15V obtained at F(+), -19.5V at
F(-)?
+5V obtained at IC710 pin #1,
#44?
-24V obtained at IC710 pin #16,
#17?
Input signal obtained at IC710 pin
#12, #13, #15?
Pulse output at IC710 pin #14?
Check POWER circuit
Check POWER circuit
Check POWER circuit
Check IC 710
Check IC 710
NO
YES
YES
YES
YES
NO
NO
NO
NO
Oscillation at IC710 pin #2,
#4?
YES
1.5V obtained at R760 when POWER switch is
pushed? 3V obtained at R761 when OPEN switch
is pushed? 4V obtained at R762 when PAUSE
switch is pushed?
Check communication line with
DVD B/D
Check communication line
between IC710 and VFD
YES
NO
Check wire connection between P710
and P900
Check IC 710
NO
Check SW900, SW901
NO Problem
YES
NO Problem
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