April, 2007 SERVICE CALL CONDITIONS 4-41
SC372 D
TD sensor adjustment error 1: K
SC373 D
TD sensor adjustment error 2: M
SC374 D
TD sensor adjustment error 3: C
SC375 D
TD sensor adjustment error 4: Y
During TD sensor initialization
with SP3801, the output value of
the black, magenta, cyan, or
yellow TD sensor is not within
the range of 3.2±0.2V
• Film seal not removed from a new
developer pack
• TD harness sensor disconnected, loose
or defective
• TD sensor defective
• Harness between TD sensor and drawer
disconnected, defective
1. Turn the machine OFF and ON.
2. Pull ouut the film seal from the black, magenta, cyan, or yellow PCU.
3. Do SP3812 001 to confirm that the developer was initialized correc tly. The
display should show "1111" if developer initialized correctl y.
4. Check the TD sensor connector.
5. Check the TD sensor connector and harness between the TD sensor and
PCU for damage. Replace it if necessary.
6. Check the drawer PCU connector.
7. Replace the TD sensor.
8. After replacing the TD sensor:
• Do SP3801 003-006 to initialize the new black, magenta, cyan, or yellow
TD sensor.

• Execute SP3820 001 to do auto process control manually.

SC396 D
Drum motor error 1: K
SC397 D
Drum motor error 2: M
SC398 D
Drum motor error 3: C
SC399 D
Drum motor error 4: Y
When the drum motor of the black,
magenta, cyan, or yellow PCU
starts, the machine cannot detect a
LOCK signal within 2 sec. The
motor is trying to rotate but there is
an excessive load on the drum
shaft. The motor has no traction
(due to a bent cleaning blade, for
example).
• PCU drum dirty
• PCU defective
• Motor harness defec tive
• DRB (Drive board) defective
• Drum motor def ective
• Insufficient lubrication on a drum.
Open PCU and apply toner to the
drum surface