Konica Minolta bizhub C658 Service Manual page 884

bizhub C658/C558/C458/C368/C308/C258
(c) Setting item
600dpi - Front
600dpi - Back
1200dpi - Front
1200dpi - Back
(d) Setting range
• -8 to +7 (step: 1 *)
• *: 1 step is equivalent to 100 V.
(e) Procedure
1. Call the Service Mode to the screen.
2. Touch [Imaging Process Adjustment] -> [Transfer Voltage Fine Adj].
3. Select [2nd Transfer Adj].
4. Select the image side (First Side or Second Side) and resolution (600 dpi or 1200 dpi) when a transfer failure occurs.
5. Select the paper type with the transfer failure.
6. Enter the new setting from the [+] / [-] keys.
• To increase the ATVC value (in the direction of a foggier image), increase the setting value.
• To decrease the ATVC value (in the direction of a less foggy image), decrease the setting value.
7. Touch [END] to validate the setting value.
8. Check the print image for any image problem.
NOTE
▪ To automatically control the 2nd image transfer output without using the 2nd image transfer voltage fine adj value, press
[Auto].
5.6.11 Charge AC Output fine adjustment
(1) Use
• Adjusts the charging AC voltage applied to the charge roller.
• Adjusts the voltage when there are image problems (fogging, white spots, etc).
• Increases the setting when there are image problems (fogging, white spots, etc).
(2) Default setting
• 0
(3) Setting range
• -12 to 8 (step: 1*)
*: 1 step is equivalent to 25 Vpp.
5.6.12 Thick Paper Density Adjustment
(1) Use
• To fine-adjust density of printed images of each color for thick paper.
• To change the density of the printed image for each color with thick paper.
(2) Default setting
• 0
(3) Setting range
• -5 to +5 (step: 1)
(4) Procedure
1. Call the Service Mode to the screen.
2. Touch these keys in this order: [Imaging Process Adjustment] -> [Thick Paper Density Adjustment].
3. Touch the Lighter or Darker key for the desired color to correct the image density.
• Light color: Touch the Darker key.
• Dark color: Touch the Lighter key.
4. Touch [END] to validate the setting value.
5.6.13 Grad/Dev AC Bias V Selection
(1) Use
• Changes the developing AC voltage, charging AC voltage and 1st. image transfer current settings.
• Turn ON to lower the above-mentioned voltages and prevent white spots caused by leakage.
• Used when white spots occur on the entire image surface in low atmospheric pressure environments, such as in high altitudes, or when
void areas occur on a yellow halftone pattern image or a solid pattern image.
Plain - Color, Normal Paper - Black, Normal Paper - Glossy, Thin Paper - Color, Thin Paper - Black, Thick1 -
Color, Thick Paper1 - Black, Thick1+ - Color, Thick Paper1+ - Black, Thick2, Thick3, Thick4, Post., Envelope,
OHP Film, Banner Thick1+, Banner Thick2, Banner Thick3
Plain - Color, Normal Paper - Black, Thin Paper - Color, Thin Paper - Black, Thick1, Thick1+, Thick2, Thick3,
Thick4, Post.
Plain - Color, Normal Paper - Black, Thin Paper - Color, Thin Paper - Black, Thick1 - Color, Thick Paper1 -
Black, Thick1+ - Color, Thick Paper1+ - Black, Thick2, Thick3, Thick4, Post., Envelope, OHP Film
Plain - Color, Normal Paper - Black, Thin Paper - Color, Thin Paper – Black, Thick1, Thick1+, Thick2, Thick3,
Thick4, Post.,
I ADJUSTMENT/SETTING > 5. SERVICE MODE
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