Service manual

Timing
The revolver rotates at particular times to prevent errors in toner end
detection. This rotation has two purposes; one is to supply toner to the
hopper (especially important for Black toner; see section 6.2.4), the other is
to agitate the toner in the hopper.
- Toner Supply to the Hopper -
When making multiple copies in black and white mode, the revolver is not
rotated. Because of this, toner might not be supplied to the hopper section
and a false toner end condition could occur. To prevent this, the revolver is
rotated at the following times to supply toner to the hopper section.
1. After the main switch has been turned on and the process control self
check has been performed, the development unit rotates ten times.
2. During transfer belt lubrication after the last copy job has been
completed and if more than 50 copies have been made since the last
cleaning mode, the development unit rotates twice.
3. After the interval process control self check (default: every 150 copies),
the development unit rotates 5 times.
4. When the sum of the LD output levels for calculating the image area
integration data is over a certain level, the machine temporarily stops the
copy job until the development unit has rotated 10 times.
When the development unit rotates, the machine stops the development
unit for 2 seconds at the 180-degree and 270-degree positions from the
revolver home position (these are the Y and M development positions).
This is to make sure that enough Bk toner passes from the cartridge to
the hopper and toner supply roller (in the normal position, the shutter is
closed, and toner cannot enter the hopper).
Detailed
Section
Descriptions
DEVELOPMENT UNIT
SM 2-79 A166/A187/A189
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA