Sam4s ER-420F - Thermal Printer Problem

8 Troubleshooting
8-4 SAM4S ER-420M/F SERIES
End
Thermal Printer
Problem
Print
Ok?
Y
N
1. Check the Control Signal on CPU
2. Check the Harness.
3. Check the related Circuit and Pattern.
Power Vcc
V
PH Ok?
Y
1. Refer to the Power Problem.
2. Check the Harness.
N
Sensor
OK?
1. Check the related Circuit and Pattern of 74HC14 (U9).
2. Check the Harness.
3. Check the Sensor of Print Connection PBA.
Y
Line Feed
OK?
N
1. Check the Phase Signal (CPU P10.5,P10.6, P7.6,P7.7)
2. Check the Driver TEA3718S (U7,U8,U12,U13)
Enable Signal.
3. Check the related Circuit and Pattern(IC LB1838).
4. Check the Harness.
5. Check the Feed Step Motor .
Y
N
Thermistor
OK?
1. Check the ADC Port P10.0 of CPU.
2. Check the related Circuit and Pattern.
3. Check the Harness.
4. Check the Thermistor of TPH.
8-4 Thermal Printer Problem