Daewoo RD-400 - Manual (Page 22)

6. Trouble Shooting Guide
7. MECHA CONTROL Abnormal
Yes
Check if the
data input of
IC501 is ok?
OK
Control Abnormal of
Disc Loading
Yes
Replace IC501
Check the
output of IC302
is ok?
No
No
Yes
Check VFD
data is ok?
Replace Front PCB Ass'y.
Check Connection CN701.
Check data waveforn of
VFD_DATA, CLK, CS
No
Check the
Supplied power
is ok?
Check Power Supply Circuit.
No
Replace IC302
Yes
Check the
interface data
is ok?
Check data between IC501.
No
Yes
20
Audio Part