3-20
3. Front Circuit(Dogotrpm & Key)
NO
NO
NO
START
Does remote control
work normally?
Do all the
buttons work
normally?
Check waveform of
IC701 Pin 1, 2
Check waveform
of IC701 Pin 41, 42.
Is Digitron on normally?
Check waveform of
IC701 Pin12, 16, 18, 19?
LED ON?
Check waveform
of IC701
Check and Replace
IC703.
Pin 25.
when power S/W turn on,
Is oscillation of X701
normal?
Check and Replace C713
Check the connection
of CON701.
Check waveform
of IC701 Pin 1, 2.
Does pulse
waveform of RC701 Pin 1
appear?
Is IC701
Pin 49 connected to
RC701 Pin15?
Is RC701 Pin 2 5V?
Power on.
Check
-R740 ~ R750
and replace
Check the buttons
Solder defective parts
Replace IC701.
Solder Key part.
Check Power.
Replace IC702.
Replace IC701.
Replace D702.
Replace RC701.
Re-solder.
Recheck
Replace IC701.
Complete repairing Front B/D.
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Summary of Contents for DVP7772
Page 28: ...3 7 3 8 LCD CIRCUIT DIAGRAM LCD1 CIRCUIT DIAGRAM ...
Page 29: ...3 9 3 10 LCD2 CIRCUIT DIAGRAM ...
Page 30: ...3 11 3 12 LCD3 CIRCUIT DIAGRAM SR14121A ...
Page 32: ...3 14 3 15 LCD P C BOARD LOCATION GUIDE LOCATION GUIDE ...
Page 33: ......
Page 50: ...3 60 3 61 PRINTED CIRCUIT DIAGRAMS 1 MAIN P C BOARD LOCATION GUIDE LOCATION GUIDE ...
Page 51: ...2 KEY P C BOARD LOCATION GUIDE LOCATION GUIDE 3 62 3 63 ...
