Sam4s ER-5200 Service Manual page 60

8 Troubleshooting
8-4 Thermal Printer Problem
8-4
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Thermal Printer
Problem
Power Vcc N
V Ok?
PH
Y
Line Feed
N
OK?
Y
Sensor N
OK?
Y
Thermister
OK?
Print N
Ok?
Y
N
Auto Cutter
OK?
Y
End
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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 (U1,U3) Enable Signal.
3. Check the nCS Signal of Latch 74HC574 (U7)
4. Check the related Circuit and Pattern(IC LB1838).
5. Check the Harness.
6. Check the Feed Step Motor .
1. Check the nCS Signal of Latch 74HC541 (U8)
2. Check the related Circuit and Pattern of 74HC14 (U6).
3. Check the Harness.
4. Check the Print Conn PWB and Sensor PWB.
1. Check the ADC Port P10.0, P10.1 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.
1. Check the Motor Phase Signal (CPU P1.5)
2. Check the related Circuit and Pattern.
3. Check the Harness.
SAM4S ER-5200 Series