Service manual

SR4 Fuser delivery paper sensor
SR5 Pre-fuser paper sensor
SR8 Paper width sensor
SR9 Pressure alienation sensor
M1 Main motor
M2 Fuser/Delivery motor
M3 Pickup motor
SL1 Cassette pickup solenoid
SL2 Magenta, cyan, and yellow developing cylinder drive solenoid
SL3 Black developing cylinder drive solenoid
Manual feed slot pickup mechanism
This mechanism picks up one sheet of paper only that is inserted into the manual feed slot and then
into the printer. This printer does not have a pickup roller in the manual feed slot. Instead of a pickup
roller, the registration roller picks up paper. The presence of paper in the manual feed slot is
detected by the manual feed slot paper sensor (SR3). The following is the operational sequence of
the manual feed slot pickup.
1. If paper is set into the manual feed slot during STBY mode, the manual feed slot paper sensor
(SR3) detects it.
2. When the paper is detected, the DC controller drives the pickup motor (M3) for 5 seconds. The
paper is fed approximately 5 mm (0.2 inch) and is then caught by the registration roller.
3. After the above operational sequence, the paper is fed by the drive of the registration roller.
Paper feed mechanism
This mechanism feeds one sheet of picked up paper to the fuser. There is a paper width sensor in
the paper transport path to prevent temperature rise at the end of the fuser. It detects paper with
widths of shorter than 190 mm (7.5 inches). The following is the operational sequence of paper feed.
1. Paper skew is corrected by the registration shutter when the paper is fed into the printer.
2. Toner is transfered to the paper from the photosensitive drum and then the paper is fed to the
fuser/delivery stage.
Skew correction by the registration shutter
If the paper fed into the printer is skewed, when it hits the registration shutter, it will be adjusted.
Figure 4-13 Skew correction on page 52 illustrates how skewed paper is corrected by the registration
shutter.
ENWW Pickup and feed system 51