Xerox 5915, Service Manual

Page: 59 / 146

4-24
Section 4 Disassembly/Assembly/Adjustment
5. Xerographic
5.1.3 Charge Corotron Wire Replacement
Removal
1. Power off the machine and disconnect the
Power Plug.
2. Open the Front Cover and then the machine.
3. Remove the Drum Unit. ……................
(5.1.1)
4. (Fig. 1): Remove the Charge Corotron
Assembly.
➀ . Remove Screw.
➁
. Remove Charge Corotron Assy.
(Fig. 1)
5. (Fig. 2): Remove the Charge Corotron Wire.
➀ . Remove Front/Rear Arc Shields.
➁
. Remove Spring.
➂
. Remove Corotron Wire.
(Fig. 2)
Installation
1. Perform the installation in the reverse order of
removal.
NOTE :
•
The copy edge erase amount changes
according to the Front Arc Shield
installing position. Install the Arc Shield
so that the copy edge erase amount
after replacement is the same as
before.
5.1.4 Basic Copy Quality Adjustment
Purpose To determine the correction values
of Exposure Light Quantity and
Deve. Bias to obtain copy densities
appropriate to various types of
original.
NOTE :
•
Copy Quality Adjustment should
be performed when copy quality
problems occur or the following are
replaced:
➀
. Drum Unit Replacement ....... (5.1.1)
➁
. Exposure Lamp Replacement
……………………………….. (4.3.2)
➂
. Main PWB Replacement ...... (9.1.2)
NOTE :
•
Perform TRIM before making the Copy
Quality Adjustment.
Adjustment Flow
5.1.4-A Exposure Light Quantity Setup
Purpose To adjust light quantities applicable
to each magnification and store the
values in NVM.
Check
1. Enter Diag. Mode [20-2].
The Control Panel displays the following:
Set/Count 30
2. Check that the magnification is 100%.
3. Set Test Chart(499T247 or 499T248) and
select A3 or B4.
4. Press the
Start button and make three straight
copies. (Press the Stop button when the third
copy has been made.)
NOTE :
•
Because pressing the Start button in
Diag. [20-2] will allow ten straight
copies to be made, press the
Stop
button at the completion of the third
copy.
•
This Diag Mode detects paper jams
and counts.
5. Evaluate the third copy.
Spec: At the target in the center of the copy.
•
(Fig. 1): 0.1 gray vertical/horizontal
lines disappear.
•
0.2 gray vertical/horizontal lines are
reproduced.
(Fig. 1)