Development Unit - Gestetner A294 Service Manual

DIFFERENCES FROM THE A294 I / A295 I MODELS

1.3 DEVELOPMENT UNIT

1. Grounding of the development roller doctor blade.
This is to further ensure that the development roller surface stays clean, i.e. the
development bias is properly maintained at the target level.
2. Thinning of the development unit entrance seals.
This is to further ensure that vertical black lines do not occur.
3. Increased reliability of the development unit.
To ensure that the new fine-grained toner does not cause a shaft lock, fluorine-
type seals are now used around the roller shaft.
4. Air tube newly added (development unit filter deleted).
This tube has been added to carry the air and toner sucked out by the new
development suction motor.
The air tube has been attached in the area where the development filter was,
and so this filter has been deleted.
5. SP mode newly added for controlling the toner supply interval.
SP2974 (Toner Supply Interval) determines the copy interval for toner supply.
Settings
Interval
This SP mode normally does not need to be used. However, depending on the
customer's operating conditions and installation environment, the following two
symptoms can occur. SP2974 could then be utilized to solve them:
• If the following symptoms appear with a setting of 1, changing the setting to 2
can minimize them:
1) Dirty background near the leading edge
2) The leading edge (face) of the copy stack is dirty with toner
NOTE: Please use setting 3 only when these two symptoms occur on most of the
extremely low image area originals used by the customer.
• If the following symptoms appear with a setting of 1, changing the setting to 0
can minimize them:
1) Low image density in originals with a large image area
2) Low image density when Vsp has stabilized at 0.5 or higher.
Reference: With the addition of SP2974, the operation of SP2968 (Toner Density
Correction) has been changed as follows:
1. Number of copies
Previous:Applied to number of copies set in SP2968
New: Applied to (number of copies set in SP2968) X (SP2974 value + 1)
2. Vref
Previous:Vref changed every 100 copies
New: Vref changed every (100) X (SP2974 value + 1) copies
A294/A295
CÓPIA NÃO CONTROLADA
0 1 (default)
1/1 1/2
CÓPIA NÃO CONTROLADA
2 3
1/3 1/4
11-2 SM