Epson TM-U200 series Technical Manual page 86

C o n fid e n tia l
4 Self-test is not normal.
Does the printer not
perform at all?
Replace printer
mechanism assembly.
Replace main PCB.
(*) Confirm the voltage at each terminal in the table below:
Checkpoint
Pin 3 of U2, U3, U4
R54
4-6 Troubleshooting
4
Yes
No
Yes
OK?
END
No
END
Specified value
Approx. 24 V
Approx. 5 V
Is the output voltage
of the regulator circuit on
the main board within
the specified range? (*)
Replace the mechanism.
END
No
Replace the main PCB.
No
OK?
Yes
END
Rev. A