Usb Communication Problem - Samsung SRP-350PG - SRP 350 B/W Direct Thermal Printer Service Manual

9 Troubleshooting

9-10 USB Communication Problem

USB Problem
Main PBA I/F
Failure?
Host Comm
Failure?
End
9-10
Y
N
1. Check the Control Line & Signal(CS3, RD, WR, INT)
2. Check the Data Line & Signal
3. Check the Connector(34P)
4. Check the Clock(48MHz)
5. Check the related Circuit and Pattern on I/F PBA
& Main PBA
Y
N
1. Check the Clock(48MHz)
2. Check the D+ whether it is Pull up to V3.3
3. Check the Host whether it works correctly
4. Check the USB Cable whether it is open or short
5. Check the related Circuit and Pattern on I/F PBA
Samsung Electro-Mechanics