AR-C170 (serv.man24). Descriptions of each section - Sharp Copying Equipment Service Manual (repair manual). Page 9

AR-C170M  DESCRIPTIONS OF EACH SECTION  7 - 9

The transfer belt drive power is transmitted from the drive motor
(BTM) to the transfer drive roller.

The motor (stepping motor) is driven by the drive signal sent from
the PCU.

According to the high voltage control signal from the PCU, the sig-
nal is converted into a transfer high voltage control signal with the
HV (MC) PWB, and sent to the HV (TC) PWB.

According to each color transfer high voltage control signal, a high
voltage is applied to each transfer roller from the transfer high volt-
age HV (TC) PWB through the connection spring to each transfer
roller.

The process control shutter is provided on the process control
sensor of monochrome (PCSK) and color (PCSC). When the shut-
ter is open (in image density correction and automatic registra-
tion), the toner patch formed on the transfer belt is read by the
process control sensor, and its information is sent to the PCU.

When the shutter is closed, the calibration sheet is read to perform
calibration of the sensor itself.

The shutter operation is controlled by the calibration solenoid
(CALS).

Toner scraped by the belt cleaning blade is transported to the
waste toner box by the belt waste toner transport shaft.

When the waste toner box is full, the rotation load of the waste
toner transport shaft increases to turn on the waste toner full
detection switch with the lever by the torque limiter function.

In color print, the transfer belt is in contact with four OPC drums. In
black and white print, the transfer belt unit moves down so that
only the black OPC drum is in contact with the transfer belt.

This up-and-down movement of the transfer belt is performed by
the lift-up motor (BLUM), the lift-up cam, and the unit position sen-
sor (BLUD).

When the left cabinet is opened for jam process, the rotating
mechanism of the lift-up unit separates all four OPC drums from
the transfer belt.

• Transfer belt position for color print

The four OPC drums are in contact with the transfer belt by rota-
tion of the cam in the transfer lift-up unit.

• Transfer belt position for black print

Only the black OPC drum is in contact with the transfer belt by
rotation of the cam in the transfer lift-up unit.

• Transfer belt position in jam process or replacement of the

transfer belt
When the left cabinet is opened, the transfer lift-up unit moves
down, and the transfer unit moves by 9mm accordingly.

Drive to paadle by blum
Waste toner full detection 

→

 

1000 copies 

→

 without 24g reset

Y

M

C

K

Y

M

C

K

9mm

Y

M

C

K