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1st on the EFI driver: “Job Properties” => “Image” => check in the “Text Thinning/Reversed Text Enhancement” box.
2nd still on the EFI driver: Uncheck the "Use maximum density" setting.
3rd on the engine side: “Utility” => “User Setting” => “Printer Setting” => Choose “Thin Line Enhancement”, and make the "+strong" selection.
4th still on the engine side: I proposes the following step by step method to optimize toner attachment amount.
After performing each step, check whether the symptom appears or not.
1. Access the Covered Margin Fine Adjustment and if the adjustment value is minus value, check whether the symptom occurs with the default value.
If the minus value was entered, reset to the default value (+/-0).
[Service Mode]=> [02 Process Adjustment] => [02 Process Fine Adjustment] =>[01 Covered Margin Fine Adjustment]
NOTES:
*1: The adjustment value is reflected after performing Automatic Gamma adjustment.
*2: If adjustment value is increased too much, carrier attachment or void occurs.
Therefore, check the image using test pattern
*3: If the + value is already entered at step 1, go to step 2 then step 4.
2. If the step 1 is not enough, decrease Bk maximum toner quantity adjustment value
(Start check from [-2]) [03 Machine Admin. Setting] => [01 System setting] => [05 Expert Adjustment] => [06 Process Adjustment] =>[03 Toner Quantity/Exposure]=> [Maximum Toner Quantity]
NOTE:
* Since the maximum Bk density decreases, check the image density using test pattern.
3. If the step 2 is not enough,
Access Covered Margin Fine adjustment and increase Bk adjustment value.
Start check from [+3]
[Service Mode]=> [02 Process Adjustment] => [02 Process Fine Adjustment] => [01 Covered Margin Fine Adjustment]
4. If no improvement is observed after step 1 and 2, check the following points of 1st transfer section of intermediate transfer unit:-Whether shaft holder is damaged.
-Whether pressure spring is moved from normal position
5. If no abnormal is found at the step 4, check consumables and PM parts, whether the machine and the controller are correctly calibrated and/or replace intermediate transfer unit.
I hope this helps!
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