Transfer Belt Sensor - Gestetner B147 Service Manual

Transfer Belt Sensor

The transfer belt sensor [A] works as the detection sensor during machine
initialization, and works as the position sensor during machine operations.
Before machine initialization, the lower end of the transfer belt is in the home
position. When initialization starts, the transfer belt contact motor lifts the lower end
until the actuator has passed the sensor, and lowers it to its home position. This
action actuates the sensor in a certain pattern.
The table lists the sensor actuation patterns.
Machine status
Initialization
Operation
On: The actuator is out of the sensor.
Off: The actuator is interrupting the sensor.
Copier ACS
The Auto Color Select manages the transfer belt and PCUs. To print color pages,
the ACS lifts the transfer belt and operates the four PCUs. To print black and white
pages, the ACS manages the transfer belt and the PCUs as follows:
1. The ACS keeps the transfer belt in the lower position and operates the black
PCU (does not operate the other PCUs) if the first print of a job is a black and
white page.
2. The ACS lifts the transfer belt to the upper position and operates the four PCUs
if a color page appears in the job.
3. The ACS keeps the transfer belt in
the upper position and keeps
operating the four PCUs after the first
color page. Note that all PCUs are in
operation even when black and white
pages are processed.
The ACS works when the user pushes
the Auto Color Select key from the operation panel. The table lists which PCUs are
in operation.
Key
Auto Color Select Black PCU
Full Color Four PCUs
Black and White Black PCU
SM
IMAGE TRANSFER AND PAPER SEPARATION
Standby (Default)
B/W printing
Color Printing
B/W Only Color Only
Four PCUs
Four PCUs
Black PCU
6-87
Sensor pattern
On → Off → On→ Off → On
On
On
Off
K K
Color Color
K PCU Four PCUs
Original
B/W and Color
Black PCU or four
PCUs
Four PCUs
Black PCU
B147/B149/B190
K K
Color
B146D935.WMF