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2.4 Troubleshooting Table
REPAIR
ee
POSSIBLE CAUSE
CLASSI-
FICATION
NATURE OF
TROUBLE
CHECK POINT
REMEDY
1. Motor does | Turning power | 1) Jumper wire
C3
© Verify electrical continuity
Resolder the parts or replace
not run.
ON does not
is not conducting.
across the motor power
the jumper wire C3.
cause the motor
terminals according to
to rotate or the
Par. 2.3.
rotation is
locked.
@ Check electrical continuity
@ Repair the input power side.
across the motor power
terminals according to
Par. 2.3
— Standard:
Refer to
1.2-10.
2) Improper power
supply to motor
A20 {power supply
circuit)
® Turn by hand the first reduc-
@ Remove the foreign matters.
tion gear B15 counterclockwise
and check if each mechanism
operates properly.
Rotating mechanism
is clogged with
foreign matters.
© Turn by hand the first reduc-
© Replace the hammer
A6.
tion gear B15 counterclockwise
and check if the print wheel
assy and related mechanisms
operate properly.
Hammer A6 and
Print wheel assy A7
are locked,
@ Modify the mounting position.
Print changeover cam
© Check it.
B7 is mounted
improperly.
@ When no troubles are found by | @ Replace the motor
A20.
checking the aforementioned
Causes 1) to 5).
Failure of motor
A20.
Jumper wire C3
© Check electrical continuity
e Resoider the parts or rpiace
2. No column | Motor rotates
can be
normally, but
is not conducting.
across the terminalis of the
jumper wire
C3.
printed,
no column can
detector assy C2 and trigger
:
be printed.
coil assy B13 according to
Par. 2.3.
e@ Reptace the trigger col assy
B13.
Coil of the trigger
© Measure the resistance vaiue of
coil assy B13 is
the trigger coil assy B13
broken.
according to Par. 2.3.
—
Standard:
Refer to Par.
1.2-12.
© Refer to Cause 5) of Nature
@ Modify the mounting position.
of Trouble 1.
3
Print changeover cam
B7 is mounted
improperly.
4) Breakage of the
B
@ Visually check after removing
e Replace the hammer tans fer
hammer spring of
the ink rolier assy from the
lever assy
AS.
hammer transfer
carriage A4,
lever assy A5.
Faulty engagement
®@ Modify the engagemen.
of the print can A12
@ When disengagement i jikely to
with the hammer
i
occur, bend the hammer soring
transfer lever assy
:
of hammer transfer leer assy
AS.
AS to permit easy enqgerrient.
2
:
Heating elements are
8
@ Check the circuit side to be
@ Modify the circuit sid
|
:
not energized (input
H
:
sure that the input pulse is
'
pulse isnot applied
= |
.
applied properly.
'
properly for the
|
— Standard:
Refer to ''Speci-
|
trigger coil assy B13)! |
|
fications'.
(QO
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