Sam4s ER-350 II SERIES - Printer Problems; Drawer Problems; Fiscal Problems; RS-232 Problems

6. Troubleshooting
SAM4S ER-350II SERIES 6-3
6-4 Printer Problems
6-4-1 Printer Head Failure
1. Check the FPC cable.
2. Printer Head Pin and Coil.,
3. Check the related circuit. (U10-KA555, U15-74HC05, Q14/18/19-STA471)
6-4-2 Printer step motor Failure
1. Check the FPC cable.
2. Check Motor driver IC MC34920. (U3)
6-4-3 Sensor Failure.
1. Check the FFC cable.
2. Check Sensors in Printer
3. Check the related circuit. (U15-LM339D, U5-74HC14)
6-5 Drawer Problems
1. Check Drawer Solenoid and Drawer Cable. (Both ECR side and Drawer side)
2. Check the related circuit. (Q14-STA471)
6-6 Buzzer Problems
1. Check the related circuit. (U8-LM393D, Q17-MMBT2222A)
6-7 Fiscal Problems
1. Check the fiscal chip enable signals. (U19-74HC138)
2. Check the fiscal logic circuit. (U20/21/26-74HC574, U25-74HC541)
3. Check VPP (12.5V), VCC voltages.
4. Check Fiscal Harness of Fiscal Board.
6-8 RS-232 Problems
1. Check the enabling signals from CPU.
2. Check RS-232 Driver IC MAX232. (U1)
3. Check VSERIAL (+5V) voltage.
4. Check Connector Harness of Serial Board.