Rev.D Troubleshooting 1-13
TM-U675/U675P (with autocutter) Service Manual
Confidential
7 Mechanism
voltage
(24 VA)
Located near
Q17 drain
Output when
Q24 (C) is "0."
(24V SW2 = "H")
24 V ± 10 % Q17 could have malfunctioned.
8 Mechanism
voltage
(24 VB)
Located near
Q7 Source
Only output
continuously
when power
supply unit is
connected.
24 V
± 10 % Q61 could have malfunctioned.
9 Mechanism
voltage
(24C)
Located near
Q29 base
Output when
Q46 (C) is "0."
(24V SW1="H")
24 V
± 10 % It is possible that the problem is pre-
arcing of the F2 fuse. The fuse may
have pre-arced because of a defect
in the 24V line circuit elements.
If pre-arcing of the F2 fuse happens,
do not repair the main circuit board
unit. The quality of several parts on the
circuit board is weakened by pre-
arcing of the F2 fuse, and safe
operation cannot be guaranteed.
Table1-4 Checking the power supply line
Step
# Type of Voltage
Location of
Measurement
Condition of
Measurement
Normal
Value Presumed Cause of the Error
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