5. Troubleshooting
5-4
SAM4S ER-280 SERIES
End
Printer Problem
Y
N
Power VCC
VPRT Ok?
Y
1. Refer to the Power Problem.
2. Check the Harness.
N
Thermister
OK?
1. Check the Thermistor Signal(P10.0, P10.1).
2. Check the printer FFC harness.
3. Check the Thermistor resistance of Printer.
Y
PEND Sensor OK?
N
1. Check the related Circuit and Pattern of 74HC14(U10).
2. Check the Sensor light part circuit.
3. Check the printer FFC harness & Replace the printer.
Y
N
Printing
OK?
1. Check the control signal on CPU.
(Clk / Data / Latch / Strobe#1/#2)
2. Check the VPH voltage. It is +8.0V
3. Check the VPH ON/OFF circuit and pattern.
4. Check the JOINT PCB and FFC harness.
5. Check and Replace the printer.
LF MOT
Feed OK?
N
1. Check the Phase Signal (CPU P7.6, P7.7)
2. Check the Motor Enable Signal(CPU P7.4, P7.5)
3. Check the motor driver LB1838(U1,U2)
4. Check the buffer IC 74HCT541(U11)
5. Check the printer FFC harness & Replace the printer.
5-4 Thermal Printer Problem
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