Toshiba e-STUDIO281c Service Manual page 319

14.3 Functions
1) Transfer belt
The transfer belt is made by forming resin which has an electrical resistance with high precision.
The main motor (M6) drive rotates the transfer belt drive roller and that makes to rotate the transfer
belt as well.
2) 1st transfer roller
When the 1st transfer bias from high-voltage power supply is applied, the toner is transferred from
photoconductive drum to the transfer belt. The spring presses to contact the transfer belt with the
photoconductive drum.
3) Transfer belt cleaning blade
Removes the residual toner, paper dust or foreign objects on the transfer belt surface. Transfer belt
cleaner clutch (CLT1) performs contact/release movement.
4) Transfer belt cleaner clutch (CLT1)
Performs contact/release movement between the transfer cleaning blade and transfer belt.
This clutch is driven by the transmitted drive from the developer motor (M11).
5) Used toner auger
Transports the scraped residual toner and paper dust to the toner bag. The transfer belt cleaner
auger motor (M2) drives this auger.
6) Drive roller
Rotates the transfer belt. This roller is driven by the transmitted drive from the main motor (M6).
In addition contacts the transfer belt cleaning blade to the transfer belt easily. Also retains the con-
tacting position of the transfer belt and the photoconductive drum.
7) Tension roller
Applies the tensile force to the transfer belt with its spring.
8) Idling roller
Retains the contacting position of the transfer belt and the photoconductive drum.
9) 2nd transfer facing roller
This roller contacts the 2nd transfer roller with the transfer belt between these rollers and nip the
paper.
10)Transfer belt home position sensor-1 and 2 (S15, S16)
Detects the home position of transfer belt. This reflection type sensor detects the reflection tape
inside of the transfer belt.
11)2nd transfer roller
When the 2nd transfer bias from high-voltage power supply is applied, the toner is transferred
from the transfer belt to the paper.
12)2nd transfer roller contact clutch (CLT5)
This clutch is an electromagnetic clutch which contacts or releases the 2nd transfer roller to the
transfer belt. The 2nd transfer roller contacts when this clutch turns ON and releases when it turns
OFF. Since the transport motor is its drive source, the clutch needs to be ON as long as they are
contacting.
It also controls the clutch not to turn more than 180 degrees by the spring and stopper.
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e-STUDIO281c/351c/451c
TRANSFER UNIT
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