Side Erase - Ricoh FT5233 Service Manual

ERASE

5.3 SIDE ERASE

a b c d e f g h i j k
Based on the combination of copy paper size and the reproduction ratio data,
the LEDs turn on in blocks. This prevents the shadow of the original side
edge and unexposed front and rear sides of the drum surface in reduction
mode from being developed. This reduces toner consumption and drum
cleaning load.
The following table shows which blocks of erase lamp LEDs turn on
depending on the paper size and the reproduction ratio:
Blocks ON
None
a
a–b
a–c
a–d
a–e
a–f
a–g
a–h
a–i
a–j
a–k
a–l
a–m
a–n
All (a–p)
Although no erase lamp LEDs turn on when paper size is A3/11"X17" or A4/8
1/2"X11" sideways and when the reproduction ratio is 99 to 200 %, there are
side erase margins because the charged area is limited by the charge corona
end block covers.
When the ARDF is used, one more inner block of erase lamp LEDs on the
front and the rear sides turn on. This is one more block turning on than for
normal side erase to erase the shadow of the ARDF transport belt.
l m n o p
Paper Size
A3, A4 Sideways, 11" x 17",
11" x 8 " by-pass feed
1/2
B4, B5 Sideways
8 " x 11", 8 " x 5
1/2 1/2
A4 Lengthwise
A5 Lengthwise, 5
1/2
Lead Edge and Trail Edge Erase
2-42
o n m k j i h g f
l
Reproduction Ratio(%)
", F4
1/2
" x 8 "
1/2
12 February 1992
e d c b a
99–200
95–98
91–94
86–90
82–85
78–81
74–77
70–73
66–69
63–65
60–62
57–59
54–56
52–53
50–51