Service manual

5-10 DECcolorwriter 1000
5 Theory of Operation
Caution Never rotate the pick rollers in the reverse direction.
Drum loading
As the paper passes beyond the aligning rollers, it triggers paper-pass sensor 2. This
activates the transfer roll feed motor long enough to apply tension to the transfer roll,
pulling it taut. The aligning rollers carry the sheet of paper to the spring-loaded paper
clamp, waiting in the clamp open position to capture the leading edge of the paper.
Figure 5-3. The paper pick process
Figure 5-4. Paper clamp opening to receive a sheet of paper
8699-10
Paper-
pass
sensor 2
Paper-
pass
sensor 1
Feed
roller
Aligning
roller
Paper
tray
Pick-up
rollers
Path from
paper tray
Path from
second 
feeder
paper tray
8699-11A
Drum
rotates
backward
to open
clamp
Thermal head
Transfer
roll
Aligning roller
PaperPaper 
clamp opens
as it pushes
against stop
Drum stop
(attached to engine 
frame, not drum)
Drum
Paper-
pass
sensor 2