[Misc] problems .....

[zaza]

hello l have copier olivetti copia 9021 ..it's same canon 6621 ..so if l started copy ..l have black copy ..please can you healpe me ...other can you sent me the service manuals of this copiers machine ...if you have in french longage please .DSCI0002.JPG

[teckat]

hello l have copier olivetti copia 9021 ..it's same canon 6621 ..so if l started copy ..l have black copy ..please can you healpe me ...other can you sent me the service manuals of this copiers machine ...if you have in french longage please .[ATTACH=CONFIG]6808[/ATTACH]

CHECK YOUR SCAN LAMP/and or HARNESS FOR BREAKS or CRACKS

[teckat]

hello l have copier olivetti copia 9021 ..it's same canon 6621 ..so if l started copy ..l have black copy ..please can you healpe me ...other can you sent me the service manuals of this copiers machine ...if you have in french longage please .[ATTACH=CONFIG]6808[/ATTACH]

Turning ON/OFF the Primary Charging
Roller Bias
Under the control of the microprocessor master
(Q301) on the DC controller PCB, the micro-processor
on the composite power supply PCB generates
the PCTRLS signal (pulse signal), which causes
the secondary side of the transformer (T4) to go ON
and the primary charging roller bias to be applied.
3. Controlling the Primary Charging
Roller Bias to a Constant Voltage
The microprocessor on the composite power
supply PCB reads the PDCS signal (analog signal)
from the voltage detection circuit while the bias
voltage is being applied to the primary charging
roller and controls the PDCPWM signal so that the
output voltage remains constant.
4. Switching the Application Voltage
Level for the Primary Charging Roller
Bias
The machine applies a cleaning bias to the
transfer roller during initial rotation (INTR), when
the scanner is moving in reverse (SCRV), during
last rotation, and at power-on after a jam. (See p. 3-
46.)
To improve the efficiency of cleaning by the
cleaning bias and to prevent residual memory on
the drum by the cleaning bias, the primary charging
roller bias is applied during initial rotation and while
the scanner is moving in reverse.
5. Automatic Correction of the Application
Voltage Level of the Primary
Charging Roller Bias and the Scanning
Lamp ON Voltage Level (APVC,
ALVC control)
Changes in latent static images can affect the
copy quality; such changes in latent static images
result from
• changes in the drum sensitivity, and
• changes in the charges from the primary
charging roller.
On the other hand, these changes occur because
of the site of installation (temperature, humidity),
deterioration of related parts, wear, or dirt.
The machine’s light area potential (VL) and dark
area potential (VD) tend to increase. To correct such
an increase, the machine corrects the application
voltage level of the primary charging roller (APVC
control) and, at the same time, corrects the scanning
lamp ON voltage level (ALVC control), thereby
ensuring a specific degree of light area potential
(VL) and light area potential (VD) at all times.

Cleaning the Cleaning Pad and the
Primary Charging Roller

Caution:
• Dry-wipe only. Do not use water, alcohol,
solvent, or any alcohol- or solvent-related
agents.
• When dry-wiping, use strokes in one direction
only.

clean the primary charging roller =with
lint-free paper = while rotating the roller.

Points to Note When Handling the Photosensitive
Drum
The copier’s photosensitive drum is highly susceptible
to light; mere exposure to room light can
affect the drum enough to produce white spots or
black lines on the copies. Keep the following in
mind:
• Do not spend more than 5 min when removing
jams.
• After detaching the drum unit from the copier
during servicing work, be sure to protect it in
the light-blocking sheet that came with the
drum or fresh copy paper, and place the drum
in a dark place.
Do not touch the photosensitive drum or primary
charging roller.
If you have soiled the surface of the drum
inadvertently, wipe it using a flannel cloth coated
with toner; do not use paper, lint-free or otherwise.
Do not dry wipe or use solvent to clean the drum.

[zaza]

thx lot tech nick

[nick55]

hello l have copier olivetti copia 9021 ..it's same canon 6621 ..so if l started copy ..l have black copy ..please can you healpe me ...other can you sent me the service manuals of this copiers machine ...if you have in french longage please .[ATTACH=CONFIG]6808[/ATTACH]

suggestion: make a sky shot and check how the scanning lights up. if it goes off in the middle of scanning then u have crack on ur cable as previously mentioned before by our fellow tech teckat. Too bad, i got some of this in stock b4 but i threw it away including the unit....it's too old