Ricoh infotec 3671F Service Manual page 26

DETAILED SECTION DESCRIPTIONS
PRINTING
2.2.4. Laser Exposure
1. Overview
[D]
The components of the laser section create a latent image on the drum. The
charge on the exposed areas of the drum drops to about -50 V while
non-exposed areas remain at about -800 V.
This machine uses a rotating square mirror [A]. The beam emitted from the
LDDR [B] is reflected by the square mirror to the line synchronization detector
[C] for line synchronization in the main scan direction. The mirror's rotation
speed is 8431.7 rpm.
As a safety feature, the shutter [D] closes to block the laser beam path
whenever the top cover is opened.
Cross reference
Group 3 Facsimile Manual: section 4-3-3
2. Error Conditions
LD Failure:
The mechanical control board detects an LD failure when the laser power is
out of the specified range. When this occurs, the machine warns the user on
the LCD panel (SC code 2-22).
2-9
June 30th, 1996
[C]
[B]
[A]
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