Samsung DSR9500EMVIA - Manual (Page 37)

Troubleshooting
4-6 Samsung Electronics
NO S/W DOWNLOAD
R258, R259 voltage
is 8~10V?
Check DB201, RS232 cable.
Yes
Yes
No
Check U201.
No U200 (11, 12, 13, 14)
occur data waveform
Check U108.
Yes
Check U100.