Sam4s ER-390 SERIES Service Manual page 48

8 Troubleshooting
8-4 Thermal Printer Problem
Thermal Printer
Problem
Power Vcc
V
PH
Line Feed
OK?
Sensor
OK?
Thermistor
OK?
Print
Ok?
End
8-4
N
OK?
Y
N
Y
N
Y
N
Y
1. Refer to the Power Problem.
2. Check the Harness.
1. Check the Phase Signal (CPU P7.4,P7.5)
2. Check the Driver LB1838 (U6) Enable Signal.
3. Check the related Circuit and Pattern(IC LB1838).
4. Check the Harness.
5. Check the Feed Step Motor .
1. Check the related Circuit and Pattern of 74HC14 (U9).
2. Check the Harness.
3. Check the Print Connection PBA and Sensor PBA.
1. Check the ADC Port P10.0, of CPU.
2. Check the related Circuit and Pattern.
3. Check the Harness.
4. Check the Thermister of TPH.
1. Check the Control Signal on CPU
(Data/CLK/Latch/Strobe1,2,3,4)
2. Check the Harness.
3. Check the related Circuit and Pattern.
SAM4S ER-390 SERIES