Daewoo RD-400 - Manual (Page 21)

6. Trouble Shooting Guide
7. MECHA CONTROL Abnormal
Yes
Check if the
data input of
IC501 is ok?
OK
Control Abnormal of
Open/Close
Yes
Replace IC501
Check the
output of IC303
pin 1,7 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 IC303
Yes
19
Audio Part