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2.5 REPAIR
2.5.1 REPAIR LEVELS
LEVELA:
Requires
general
knowedge
and
technical
skills regarding the operating
principles and structure of the printer, but
does
not
require
previous
repair
experience.
Requires
certain
degree
of knowledge
regarding
the
operating
and
skills
in
principles and structure of the printer, and
using the assembly / disassembly tools
and
measuring
instruments
as well as
previous repair experience.
LEVEL B:
2.5.2. REPAIR PROCEDURES
In a case trouble occur with the printer, carefully
checks its symptoms and condition, clarify the source
of the trouble with reference to subsection
2.5.3,
"Repair Guideline" then repair the damaged area.
Note that the tables of "Repair Guideline" consist of
the five following items, enabling troubleshooting and
repair to be performed with speed, efficiency, and
minimum errors of judgement.
2.5.3. REPAIR GUIDELINE
CAUSE
(1) Defect of power
input to motor
CONDITION
The motor
doesn't rotate
despite receipt
of a Print
command
1. No motor
rotation
(2) Faulty motor
. The motor
The motor stops
|(1) The motor
stops rotating | rotating during a
speed is too
printing
slow
operation
. The motor
(1) Rotation
Faulty motor
doesn't stop
doesn't stop
| charge control
rotating
after com-
circuit
pleting a
print cycle
LEVEL | CHECK POINT AND METHOD
REPAIR
METHOD
e
* (era
cae
voltage to the mo-
|@
If not, replace the motor.
tor
* (era
cae
and check if
the motor rotates.
PHENOMENON
Check the symptoms of the trouble.
CONDITION
Compare
the
condition
of the
trouble
with
the
descriptions of this column and locate the matching
description.
CAUSE
This column lists the potential causes on the basis of
the trouble condition, allowing the cause of the trouble
to be identified. Also refer to the repair level provided
for each potential cause.
CHECK POINT AND METHOD
This column lists the points to be checked as well as
the checking procedure to confirm the actual area
causing the trouble. Be sure to inspect the check
points according to the instructions in this column.
REPAIR METHOD
Repair the trouble area according to the instructions
in this column.
If the identical
phenomenon
and
condition
is unchanged
after reforcing the repair,
check another item of the "cause"
column then
perform the pertinent repair.
@
If you wish to slowly check the operation of each
gear and of the rollers and levers coupled to the
gears, turn the second
reduction gear in the
counter-clockwise direction.
@
inspect and repair the
wiring of the power sup-
ply circuit board as well
as the wiring board.
@
Check the input power
supply
Use a tester or oscillo-
scope to check the input
voltage between the @
and © terminals of the
motor power supply.
Rating for Model-405(R)
17 VDC
+ 7%
@
Use a tester or oscillo-
scope to check if the
Timing pulses from the
wiring board are within
the rated pulse width.
@
If not, replace the motor.
@
if not, repair the motor
charge control circuit.
@
Check if the motor stops
after power
input to the
motor is cut off on the
control circuit (calculator
side).
—~33-
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