Epson TM-U675 - Test Points on the Printer Mechanism

Rev.D Troubleshooting 1-11
TM-U675/U675P (with autocutter) Service Manual
Confidential
Test Points on the Printer Mechanism
This section shows how to test the motor and the coils.
Table1-3 Test points on the printer mechanism
Name of
Mechanism Part Name Internal Element Function Where to Check Normal Status
Autocutter
unit
Cutter motor
assembly
DC brush motor Autocutter drive Remove the cable
connector connected
to CN7 on the main
circuit board unit and
test between pin 1 and
pin 2.
The line must
be continu-
ous.
Mechanism
assembly
(M-U675)
Lever drive coil
A (left side
when facing
the front of the
printer)
Coil
• Form stopper
operation
• Slip paper roller
(sub) operation
Remove the cable
connector connected
to CN30 on the main
circuit board unit and
test between pin 26
and pin 27.
Approx. 70
Ω
Lever drive coil
B (right side
when facing
the front of the
printer)
Coil • Platen open
and close.
• Cylindrical
printer platen
open and close
Remove the cable
connector connected
to CN30 on the main
circuit board unit and
test between pin 26
and pin 28.
Approx. 70
Ω
Carriage motor 4 phase stepping
motor
Head carriage
drive
Remove the cable
connector connected
to CN30 on the main
circuit board unit and
test between pin 1 and
pin 2 and between
pin 3 and pin 4.
Approx. 4.5 Ω
(per 1 phase)
Lever drive
motor assembly
DC brush motor
• Form stopper
operation
• Slip paper roller
(sub) operation
• Platen open
and close
• Endorsement
printer platen
open and close
Remove the cable
connector connected
to CN30 on the main
circuit board unit and
test between pin 29
and pin 30.
The line must
be continu-
ous.
Paper feed
motor
4 phase stepping
motor
Slip paper feed Remove the cable
connector connected
to CN30 on the main
circuit board unit and
test between pin 17
and pin 18 and
between
pin 19 and pin 20.
Approx. 8
Ω
(per 1 phase)
J/S change
solenoid
Coil Change of
journal paper
drive/slip paper
drive.
Remove the cable
connector connected
to CN30 on the main
circuit board unit and
test between pin 21
and pin 22 .
Approx. 45
Ω
MICR solenoid Coil MICR hold drive Remove the cable
connector connected
to CN27 on the main
circuit board unit and
test between pin 1 and
pin 2 .
Approx. 28.8 Ω
A
ROTOR
B
AB
A
ROTOR
B
AB