Service manual

SC TABLE
G130/G131 4-14 SM
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 240 LD over
240-001: Y
240-002: M
240-003: C
240-004: K
The power supply for the LD
unit exceeds 110 mA.
• LD worn out
(current/light output
characteristics have
changed.)
• LD broken (short
circuit)
1. Replace the laser optics-housing
unit.
C
SC 285 Line position
adjustment
(MUSIC) error
Line position adjustment fails
four consecutive times.
• Pattern sampling error
due to insufficient
image density of
patterns used for the
adjustment
• Inconsistency in the
sampling line position
adjustment pattern due
to dust on the pattern,
damage to the OPC
drum, damage or toner
dropped on the
transfer belt, or a dirty
or defective ID sensor
1. Check and fix the problem that
causes low image density. .
2. Clean or replace the transfer belt
and/or the ID sensor.
3. Replace the PCU or clean the
development unit that causes toner
to drop on the transfer belt.
C
SC 370 TD sensor [K]:
Adjustment
error
SC 371 TD sensor [Y]:
Adjustment
error
SC 372 TD sensor [C]:
Adjustment
error
SC 373 TD sensor [M] :
Adjustment
error
During the developer
initialization, the output value of
the TD sensor is out of the
adjustment range (X ± 0.2V).
NOTE: “X” is adjusted with
SP3-006-005 to -008.
• Poor connection (TD
sensor outputs is less
than 0.5V.)
• Defective TD sensor
1. Turn the main switch off and on.
2. Reset the related color development
unit.
3. Replace the related color
development unit.
D