Ricoh A085, Manual

Page: 541 / 617

9. COPY QUALITY ADJUSTMENT
9.1 LIGHT INTENSITY ADJUSTMENT (SP48)
When: After performing SP66 (Drum initialize) and before
exiting the SP mode when replacing the drum.
Purpose: To properly adjust light intensity for the initial V
L
pattern detection (storing Vref = initial Vlp/Vlg)
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: SP48 changes the exposure lamp voltage from ac
drive circuit on the dc power supply board.
NOTE: Light intensity adjustment should be done only after performing SP66
when replacing the drum. If light intensity is adjusted after the initial
V
L
pattern detection, the light intensity will be changed to the initial
setting by subsequent V
L
corrections. As an exception for this
±
0.5 V
change of SP48 data is effective to the light intensity even after the
initial V
L
pattern detection. Because the V
L
correction changes the
lamp voltage
±
1 V step.
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)
Corona wires (charge, transfer,
and separation) and corona unit
casing
Dry cloth or water
(3)
QL filter, PTL filter, toner shield
glass and filter, and erase lamp
unit
Dry cloth and blower
brush
3. While pressing both "1" and "3" on the operation panel number keys, turn
on the main switch.
NOTE: Release the number keys after confirming that the Call Service
indicator and the copy counter number "0" are blinking.
4. Enter "48" using the number keys and press the "#" key.
5. Press the "#" key again and set the OS-A3 chart on the exposure glass.
Replacem
ent
Adjustm
ent
12 February 1992 COPY QUALITY ADJUSTMENT
5-85