Samsung SRP-350PG - SRP 350 B/W Direct Thermal Printer Service Manual page 90

9 Troubleshooting
9-9 IEEE-1284 Parallel Communication Problem
IEEE1284 Problem
Y
Froward Mode
Failure?
N
1. Check the Control Line(CS3)
2. Check the 1284 Control Line and Status Line
3. Check the Signal of ICs(U3, U6, U5)
4. Check the 1284 Cable whether it is open or short
5. Check the related Circuit and Pattern on I/F PBA
Y
Reverse Mode
Failure?
N
1. Check the Control Lines(CS3, WR, P_WR)
2. Check the 1284 Control, Status Data Line
3. Check the Signal of ICs(U1, U3, U6)
4. Check the 1284 Cable whether it is open or shortl
5. Check the related Circuit and Pattern on I/F PBA
End
9-9
Samsung Electro-Mechanics