Descriptions Of Each Section - Sharp SF-2020 Service Manual

[5] DESCRIPTIONS OF EACH
SECTION
Descriptions are made on the following sections:
1 Paper feed section
2 Developing section
3 Optical section
4 Process section
5 Separation/transport section
6 Fusing/paper exit section
7 High voltage section
8 ADU section (SF-2120 only)
1. Paper feed section
1) General descriptions
To realize the compact design, the front loading system and the fol-
dable multi paper feed unit are employed.
Use of the optional two-stage paper feed unit for the SF-CM15 (one-
stage paper feed unit for the SF-CM16) and the spare tray allows a
variety of system configurations.
(System configuration) Example with the SF-2020:
SF-2020
50 sheets
250 sheets
250 sheets
SF-CM16
(One-step paper feed unit)
250 sheets
250 sheets
SF-CM15
(Two-step paper feed unit)
SF-CM15
(Option)
250 sheets
SF-UB15
(Spare tray)
Or
In the case of SF-2020:
The SF-2020 is provided with the three-way paper feed system. The
tray is of the universal type and has capacity of 250 sheets. The front
loading system allows the tray to be loaded from the lower side of the
front cabinet.
(The SF-2120 has the two-way paper feed system with one 250-
sheet tray and manual feed.)
The tray has the capacity of 500 sheets (250 sheets for the SF-2120).
In addition to that, the optional paper feed unit allows loading of 500
sheets more for the SF-CM15 (250 sheets for the SF-CM16).
2) Basic operations
(Tray paper feed operation)
When the CPFC (Cassette paper feed clutch) turn on, the paper feed
roller shaft, the paper feed roller, and the take-up roller rotate in the
direction of A. At the same time, the limiter spring moves down the
roller release arm. As a result, the take-up roller falls by its own
weight onto the paper surface, starting paper feed.
When the CPFC turns off, rotation stops and the take-up roller is
pushed up to the original position by the roller release arm spring.
(Multi manual paper feed operation)
When the MPFS (multi paper feed solenoid) turns on, the spring
clutch rotates to press the take-up roller on the paper, feeding the
paper.
5 – 1
Roller release arm
Paper feed roller
Paper feed roller shaft
Take-up
roller