Service manual

30 July, 2001 SC TABLE
4-13
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 285
Line position
adjustment
(MUSIC) error
Line position adjustment fails
three 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. Turn the main switch off and on.
2. Check and fix the problem that
causes low image density. .
3. Clean or replace the transfer belt
and/or the ID sensor.
4. Replace the PCU or clean the
development unit that causes toner to
drop on the transfer belt.
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 without the
adjustment range (3.0 ± 0.1V).
• 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.
SC 374 Vt error [K]
SC 375 Vt error [Y]
SC 376 Vt error [C]
SC 377 Vt error [M]
During the image
development, Vt value is less
than 0.5V.
• 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.