Ricoh FT 4015, Service Manual

Page: 176 / 229

8.1 LIGHT INTENSITY ADJUSTMENT
8.1.1 Base Exposure Lamp Voltage Adjustment
When: Every Call
Purpose: To maintain the correct light intensity.
Adjustment
Standard: Level 2 (E0.2) of the gray scale on the OS-A3 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. Unplug the power cord.
2. Clean the following parts:
Item No. Section Method
(1)
Optics (mirrors, lens, filter, reflectors,
exposure glass) Damp cotton, silicone cloth, and
blower brush
(2)
Corona wires (charge and transfer) and
casings. Blower blush
(3) QL, Erase Lamp Dry cloth and blower blush
3. Open SP33 and return the setting to the normal value if it has been
changed.
4. Place the OS-A3 test chart on the exposure glass and make a full size
copy at manual image density level 4 (center).
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 value with the numeral keys as follows:
If the image density is too dark: Increase the value
If the image density is too light: Decrease the value
8. Confirm that the image density is within the adjustment standard.
9. Perform the ADS adjustment. (See ADS Adjustment.)
COPY QUALITY ADJUSTMENT 20 December 1996
6-50