5.4 Setting C
NOTE
Setting C is sometimes needed when making the following
replacements:
Replacing the development unit, ID sensor board, toner density sensor, toner density control board. VSG lock release
might be required when the OPC belt is replaced.
CAUTION
1. When the parts described above are replaced, the target toner density data might
change. Perform setting C to store the new data.
2. When the OPC belt is replaced, V SG may lock. So, access service tool [4-02] and
make a free run to check V SG operation. If it is locked, perform setting C (release the
VSG lock).
3. When the Developer Forming key in the [4-02] screen is pressed, the "Setting Target
T. D." value is changed according to the toner density measured by the toner density
sensor. As the "Actual Target T. D." value (the actual target for the toner density
control) is controlled only in a range of ± 0.74 volts from the "Setting Target T. D."
value, the toner density control cannot be operated properly if the "Setting Target T.
D." value is not correct. Do not press the Developer forming key without performing
setting C. (The developer forming key in the [3-04] screen does not change the "Setting
Target T. D." value.)
4. The toner density of new developer is approximately 3%. This makes the V SG/VSP
on the [4-02] screen 8 ± 2 without performing setting C. Use the developer forming
key in the [3-04] screen when the developer is replaced with new one.
1. Turn ON the main switch and wait for the copy stand-by condition.
2. Access service tool [4-02].
3. Press the Developer Forming key. (This is to store the new target toner density data.)
4. Press the Start key, and press the Clear/Stop key after about 5 to 10 flashes.
NOTE
In the [4-02] screen, the VSG and VSP are checked and changed
when the Clear/Stop key is pressed during free run.
5. Read the VSG/VSP on the screen.
6. If the value is 10 or more, leave the service tool and make 5 to 10 black solid copies to re-
duce the toner density.
If the value is 6 or less, leave the service tool and make 5 to 10 blank copies to increase the
toner density.
If the value is between 6 and 10, the setting is completed.
CAUTION
Use the manual density key when you make
black solid copy. In the AID mode, excessive
development bias is applied, so do not use this
mode.
Setting C 1 July 1994
5-10
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