Xerox 5915, Service Manual

Page: 60 / 146

4-25 5. Xerographic
Section 4 Disassembly/Assembly/Adjustment
6. Go to one of the following steps per the result
of the evaluation.
Within Spec.
→
Perform Steps 3 through 5 in
70%/141% magnification
modes.
Out of Spec.
→
Proceed with the adjustment
procedure.
Adjustment
Reference The Exposure Light Quantity can
be set up by changing the NVM
value.
a. Normally adjust by the [20-2]
value.
b. Adjust by [20-20] in the cases
below:
•
Light Quantity is unadjustable
by the NVM value.
•
The Main PWB has been
replaced.
NOTE :
•
Make sure to first perform the
adjustment in 100% mode.
Adjustment Flow
Adjustment by NVM Value (Normal Adjustment)
1. Enter Diag. Mode [20-2].
2. Select 100% Magnification.
3. The exposure setting is adjusted by pressing
the following buttons on the keyboard:
. a. Button 6 to decrease the Exposure.
b. Button 9 to increase the Exposure.
4. While making the copies, adjust the exposure
so that the .20 gray lines are reproduced
clearly and the .10. gray lines disappear.
5. When the correct setting has been achieved,
press the
Start button and make three straight
copies.
6. Repeat Steps 3,4 & 5 until the results satisfy
the spec. in Step 5, Check.
7. When the reproduced copies meet the spec,
press the Start button while the machine is
running in Diag. Mode[20-2]. This enables the
light quantity to be stored in NVM.
8. Perform Steps 3 through 7 in 70%/141%
modes.
Adjustment by [20-20]
1. Enter Diag. Mode [20-20].
The Control Panel displays the following:
Set/ Count 50
2. Select 100% Magnification
3. Using the keyboard, enter number:
Increasing the number increases the exposure
Decreasing the number decreases the
exposure.
4. Check the copy meets the spec in step 5 of
“check” .
5. Perform steps 3 to 7 of Adjustment by NVM
[20-2] Value Process Normal Value.