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[7] OPERATIONAL DESCRIPTIONS
1. Optical system
1-1. Optical system outline
Light source:
Fuse bulbs are used as the light source. Eight fuse
bulbs are arranged in series on the PWB. The
temperature fuse is also installed on the PWB. The
copy lamp also has the function as the discharge
lamp to attenuate the potential on the drum.
Lens:
A selfoc lens is employed.
AE sensor:
A photo sensor is employed to read document den-
sity for improving maneuverability and stabilizing pic-
ture quality.
Copy lamp
Copy lamp unit
Discharge light
1-2. Void area and image loss
1
Void area: With the original cover open, make a copy without an
original in place. The white area on the copy is called "void area."
2
Image loss: Loss (or area) of the image lost on the copy.
3
Specified values of void area and image loss
Document
table
AE sensor
SELFOC lens
Drum
Copy
Lead edge image loss 2mm max
Void area
Image loss
2. Paper feed section
2-1. paper feed section outline
The paper feed section differs greatly from the models: the Z-21 and
the Z-26.
In the Z-26, max. 50 sheets of paper can be set on the multi tray, and
max. 20 sheets of multi copy run is available.
In the Z-21, only single manual feed is available.
The figure below shows the cross section of the Z-21 and the Z-26.
<Z-26>
Paper in detection
switch (PID)
Paper feed roller
Resist roller
Friction plate
<Z-21>
Paper in detection switch (PID)
Paper stopper
Resist roller
– 12 –
(Document)
1 ∼ 5mm max.
Lead edge
Lead edge
2mm max.
Stopper
[Paper feed side]
Take-up roller
[Paper feed side]
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