3-17
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
Check Audio filter, amplify,
mute circuit.
Check Aout_L related circuit
Aout_R
NO
Normal
Audio output when
disc playback.
Proper
Aout_L, Aout_R signal
on MTK1389
NO
Check the related circuit of
Audio DAC.
NO
YES
YES
Check communi cation lines
on MT1389
NO
Normal
IR. VFD & Front pannel
key functions.
Commu-
nications between
IR.VFD Front pannel key &
MT1389 & Front µ-com
is normally.
NO
NO
YES
Check the cable connection
on Front pannel.
TEST END
YES
E
YES
Summary of Contents for DP270B
Page 15: ...3 6 MEMO ...
Page 17: ...3 9 3 10 PRINTED CIRCUIT DIAGRAM TOP VIEW BOTTOM VIEW MEMO ...
Page 34: ...3 27 2 WIRING CONNECTION DIAGRAM 2 MAIN PCB KEY PCB MAIN PCB Key PCB ...
Page 51: ...3 55 3 56 1 MAIN P C BOARD TOP VIEW PRINTED CIRCUIT DIAGRAMS ...
