Sanyo ECR-238 - Page 33

2.5 REPAIR
In
consideration
of
the
level
of
expertise
required
for
implementation
of
after-sale
serving
and
repair
procedures.
For
the
printer
such
procedure
have
been
ranked
into
two
level's,
Level
A
and
Level
B.
The
person
in
charge
of
repair,
therefore,
shall
perform
the
repair
procedures
appropriate
to
the
repair
level
and
to
his/her
own
level
of
expertise.
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).
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