Basic Sequence; Basic Sequence Of Operation - Canon iR2020 Series Service Manual

Chapter 6
The image formation process of this machine is composed of the following five blocks (7 steps):
[1] Electrostatic latent image formation block
Step 1: Primary charging (AC & Minus DC)
Step 2: Laser exposure
[2] Developing block
Step 3: Developing (AC & Minus DC bias)
[3] Transfer block
Step 4: Transfer (Plus DC)
Step 5: Separation (Minus DC)
[4] Fixing block
Step 6: Fixing (Minus DC bias)
[5] Drum cleaning block
Step 7: Drum cleaning

6.3 Basic Sequence

6.3.1 Basic Sequence of Operation

iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
The basic sequence of operation of this machine is explained below.
For more details, refer to the explanation of various types of bias control.
- At power-on (when the door is opened/closed)
The main motor starts rotating after completion of the error check.
To prevent fogging of the drum, the developing DC bias voltage is held higher than usual during application of the developing AC bias voltage.
- During printing
To prevent fogging of the drum, the developing DC bias is held higher than usual except during image formation.
To prevent the toner remaining on the photosensitive drum from sticking to the transfer charging roller, the transfer roller bias which is lower than that applied
during printing the is applied at the prescribed timing.
6-2
4. Fixing block 6. Fixing
5. Separation
3. Transfer block
4. Transfer
Registration
Manual feed pickup
Cassette pickup
Power ON
or
Door open/close
Main motor
(M204)
Scanner motor
(M203)
Primary charging
AC bias
Primary charging
DC bias
Developing
AC bias
Developing
DC bias
Transfer bias
Static eliminator
bias
Fixing film bias
Delivery
5. Drum cleaning block
7. Drum cleaning
1. Primary charging
2. Laser beam exposure
3. Development 2. Developing block
Rotational direction of
photosensitive drum
Paper flow
F-6-2
WAIT
Cleaning bias
F-6-3
1. Electrostatic latent
image formation block
STBY
0011-0628