Daewoo RD-400 - Manual (Page 14)

12
6. Trouble Shooting Guide
START
1. INITIAL OPERATING
Is Standby
LED on?
No
Initial Operation OK.
Yes
Check OSC
waveform of
XC501.
Check I2C Line
of IC504.
Yes
Yes
Check interface
of VFD Driver
Yes
Is Power on?
Check Connection CN901/CN951.
Check Power Supply.
No
No
No
No
Yes
Check DVD Power Supply
Check Devices connected
I2C Line.
Check VFD Data Interface.
VFD_DATA/CLK.
Replace Front PCB Ass'y.
Check interface
of SDRAM
No
Check CLK of SDRAM.
Replace Flash Memory.
Is Power on?
1
No
Yes
Yes
Front Circuit