Charge Corona Unit; Electrical Components - Gestetner A294 Service Manual

DIFFERENCES FROM THE A294 I / A295 I MODELS

1.8 CHARGE CORONA UNIT

Since changes made to the development bias have the effect of decreasing the
consistency of the charge applied to the drum, the following charge corona unit
modifications were applied to ensure even charging:
1. The material of the charge wire cleaner pad has been changed to ensure more
efficient physical removal of particles on wire.
2. Changed the default value of SP2804 (Charge Corona Cleaner Setting) from 1
to 2 so that cleaning is performed every 5000 prints. However, the cleaning is
only performed at the end of a job. Copying is inhibited during this operation
however original scanning is possible.
SP2804-1
SP2804-2
3. Drum charge is increased by +50V once a certain number of copies have been
made (default: 100K). To control this, the following SP modes have been
added:
*SP3903 (Charge Bias (Vd) Correction Start Setting):
Sets the starting print counter for performing Vd correction.
*SP3902-9 (Charge Bias (Vd) Correction Display):
Displays whether or not the machine is currently operating with the +50V
correction. (0: Not applied, 1: Applied).
NOTE: The firmware contains a counter that keeps track of the number of prints
made and then compares this value with the value set in SP3903, however
the counter value is cleared to 0 when SP2801 (Developer Initialization) is
performed at developer replacement.

1.9 ELECTRICAL COMPONENTS

The I/O board has been modified to accommodate the connector necessary for the
new toner suction motor. Please note that if the new I/O board is used on the 2
predecessor models, this will cause SC496 (Toner Collection Bottle Error).
In addition, a harness has been added to the DC harness group.
A294/A295
CÓPIA NÃO CONTROLADA
A294 I / A295 I
1: Done
5,000
CÓPIA NÃO CONTROLADA
A294 II / A295 II
2: Periodically
5,000
11-6 SM