Light Sensor Adjustment - Ricoh FW780 Service Manual

8.1

LIGHT SENSOR ADJUSTMENT

When:
Purpose:
Adjustment
Standard:
Perform:
How:
1. Turn off the main switch.
2. Clean the following parts:
Item No.
(1)
(2)
(3)
3. Remove the middle right cover.
4. Make several copies at manual image density level 4 with OS-A1 chart.
5. Confirm that level 2 (10%) of the 9 step gray scale is slightly visible on the
copy. If the copy image density is not correct, proceed with the following step.
6. Change SP #-6 setting in the SP mode.
If the image density is too dark: Increase SP #-6 setting.
If the image density is too light: Decrease SP #-6 setting.
7. Confirm that image density is within the adjustment standard.
SM
1. Every Call
2. When replacing the following part
Exposure lamp
Drum
To maintain the correct light intensity.
Level 2 (10%) of the 9 step gray scale on the OS-A1 chart
should be slightly visible when the 4th manual image density
level is selected.
Change SP #-6 setting.
Change the light sensor voltage.
Section
Optics (Exposure glass, fiber
optics array)
Corona wires (charge, transfer and
separation) and casing.
PTL
Light sensor
RAM on the main board
Damp cotton and dry soft
cloth
Dry cloth
Dry cloth or blower brush
5-39
Method
A163