Sam4s ER-260 SERIES Service Manual page 34

5. Troubleshooting
5-4 Thermal Printer Problem
Printer Problem
Power VCC
VPRT Ok?
LF MOT
Feed OK?
PEND Sensor OK?
Thermister
OK?
Printing
OK?
End
5-4
End
N
N
Y
N
Y
N
Y
N
Y
1. Refer to the Power Problem.
2. Check the Harness.
1. Check the Phase Signal (CPU P2.2, P2.3)
2. Check the Motor Enable Signal(CPU P1.4, P1.5)
3. Check the motor driver LB1838(U17,U21)
4. Check the buffer IC 74HCT541(U24)
5. Check the printer FFC harness & Replace the printer.
1. Check the related Circuit and Pattern of 74HC14(U23).
2. Check the Sensor light part circuit.
3. Check the printer FFC harness & Replace the printer.
1. Check the related Circuit & Pattern of KA393 (U22,U26).
2. Check the printer FFC harness.
3. Check the thermister resistance of Printer.
1. Check the control signal on CPU.
(Clk / Data / Latch / Strobe#1/#2)
2. Check the VPH voltage. It is +6.0V
3. Check the VPH ON/OFF circuit and pattern.
4. Check the JOINT PCB and FFC harness.
5. Check and Replace the printer.
SAM4S ER-260 SERIES