Epson TM-U375 Technical Manual

4-6
6 Self-test is not normal.
Checkpoint Rating
D terminal of Q33 (output as required) +24 V
+ terminal of C49 +5 V
Is cover closed
properly?
Yes
No
Close cover properly.
OK ?
No
Yes
END
Is cover open
sensor assembly continuity
normal ? (✽1)
Replace switch PCB unit.
OK ?
No
Yes
END
Is continuity
of SW1 on switch PCB
unit normal? (✽2)
Replace switch PCB unit.
OK ?
No
Yes
END
Replace main PCB.
END
OK ?
Yes
No
Yes
Replace printer mechanism
assembly.
6
Does printer
operate at all?
No
Yes
No
No
Yes
Yes
No
Is output voltage of
regulator on main PCB within
spec.? (✽3)
END
Is data printed on
slip paper or paper roll when
performing validation
paper printing?
Printing is carried out, but
print quality is deficient or
paper feeding is not normal.
Replace printer mechanism
assembly.
OK ?
END
Yes
No
Replace main PCB.
END
Yes
No
(✽1) To check the continuity of the cover
open sensor:
Check the voltage of terminals 1 and 3
of CN2 on the switch PCB unit for the
following:
5 V when cover open is detected
0 V when cover close is detected
(✽2) For the self-test with slip paper, check
the continuity of SW2.
(✽3) Verify the voltages shown in this table:
CONFIDENTIAL

Epson TM-U375 Specifications

General

Brand	Epson
Model	TM-U375
Category	Printer
Language	English