Samsung SRP-350PG Service Manual - Page 89
Samsung SRP-350PG - SRP 350 B/W Direct Thermal Printer Manual
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9 Troubleshooting 9-8 RS-485 Serial Communication Problem RS-485 Problem Communication Y Failure? N 1. Check the connection of the RS-485 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 MAX488 Driving Chip and reated Circuit on I/F PBA 5. Check whether Signal is affected by the Cable Noise H/W Handshake Y N 1. Check the connection of the H/W handshaking Line and Other side(DR1,2/CS1,2) 2. Check the I/F Cable whether it is open or short 3. Confirm the H/W handshaking Protocol 4. Check the Voltage Level of each Line End 9-8 Samsung Electro-Mechanics
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