Ricoh A151, Field Service Manual

Page: 170 / 397

8.1 LIGHT INTENSITY ADJUSTMENT
When:
1. Every Call
2. When replacing the following parts
Exposure Lamp AC Drive Board
Main Board Drum
Auto Image Density Sensor
Purpose: To maintain the correct light intensity.
Adjustment
Standard:
Level 2 (E0.2) of the gray scale on the OS-A4
chart should be slightly visible on the copy when
the 4th manual image density level is selected.
How to Adjust: SP48
How it works: Changes the ac drive board output voltage.
1. Turn off the main switch.
2. Clean the following parts:
Item No. Section Method
(1)
Optics (mirrors, lens, reflectors,
shield glass, exposure glass) Damp cotton, silicone
cloth, and blower
brush
(2) ID sensor Blower brush
(3)
Corona wires (charge, transfer,
and separation) and casings. Casings: Water
Wires: Dry Cloth
(4) QL, Erase Lamp Dry cloth
3. Clear the V
L
correction by using SP95.
NOTE: Always perform SP95 after cleaning the optics components.
4. Place the OS-A4 test chart on the exposure glass and make a full size
copy at manual image density level 4 (center).
NOTE: Make sure that the value of SP37 is set to "0" (standard value).
5. Confirm that level 2 (E0.2) of the gray scale is slightly visible on the copy.
If the image density is not correct, proceed to the following steps.
6. Enter the lamp voltage setting mode using the numeral keys (SP48).
7. Change the data with the numeral keys as follows:
If the image density is too dark: Increase the data number
If the image density is too light: Decrease the data number
8. Confirm that the image density is within the adjustment standard.
9. Perform the ADS adjustment. (See ADS Adjustment.)
A151/A152 5-74 FSM