10. COPY QUALITY ADJUSTMENT
10.1 LIGHT INTENSITY ADJUSTMENT (SP4-001)
When: When replacing the drum - After performing SP3-123
(Drum initialization) and before exiting SP mode.
Purpose: To maintain the correct light intensity.
Adjustment standard: Level 2 of the gray scale on the OS-A3 test chart
should be just visible on the copy when the 4th
manual image density level is selected.
How: SP4-001 changes the exposure lamp voltage from
the ac drive circuit on the dc power supply board.
NOTE: When replacing the drum, light intensity adjustment should be done only
after performing SP3-123.
If the light intensity is adjusted, ADS gain data and VL correction data are
cleared. Therefore, after the light intensity adjustment, auto ADS gain
adjustment (SP4-201) and forced VL detection (SP3-105) must be
performed.
See "Practical SP Mode Use Tables" in section 4 for the exact order in
which SP modes must be done after changing major components.
1. Turn the main switch off.
2. Clean the following parts:
Item No. Section Method
(1)
Optics (mirrors, lens, reflectors, and
exposure glass)
Damp cotton, and blower brush
(2)
Drum charge roller Dry cloth or special cloth
(P/N A1539004)
(3)
Toner shield glass and green filter,
and erase lamp unit
Dry cloth and blower brush
3. Place an OS-A3 chart on the exposure glass.
4. Make a full size copy at manual image density level 4 (center) after the copier
has warmed up.
5. Check that level 2 of the gray scale is just visible on the copy.
FSM 5-51 FT5535/4527/4522
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