Samsung SRP-350PG - SRP 350 B/W Direct Thermal Printer Service Manual page 88

9-7 RS-232C Serial Communication Problem
RS-232C Problem
Communication
Failure?
H/W
Handshake
End
Samsung Electro-Mechanics
Y
N
1. Check the connection of the RS-232C Connector and Other side
2. Check the I/F Cable whether it is open or short
3. Check the Txd, Rxd Pin on CPU
4. Check the MAX232 Driving Chip and reated Circuit
on I/F PBA
5. Check whether Signal is affected by the Cable Noise
N
Y
1. Check the connection of the H/W
handshaking Line and Other side(DTR/DSR)
2. Check the I/F Cable whether it is open or short
3. Confirm the H/W handshaking Protocol
9 Troubleshooting
9-7