Paper Jam Detection - Digital Equipment COLORWRITER LSR 2000 Service Manual

Colorwriter LSR 2000 Printer
Service Guide
Mechanical controller PCB
CPU
(Q2001)
/MRDY
40
MLOW
41
/MON
38
3-112
3: Operation
+5V +24V
Figure 3-86 Fixing unit motor drive circuit

Paper jam detection

The following paper sensors are provided to detect whether paper is
present and whether the paper is fed normally:
• PS302 Registration paper sensor on the pick-up PCB
• PS303 Paper top sensor on the pick-up PCB
• PS6 Attraction sensor
• PS7 Separation sensor
• PS9 Delivery paper sensor
The CPU in the mechanical controller determines if a paper jam has
occurred by checking for the presence of paper in the sensor at the
timing preset in its CPU.
If the CPU determines that a jam has occurred, it will report the
jam to the DC controller and stop the print operation. The DC
controller then notifies the video controller that a jam has occurred.
Pick-up delay jam
The CPU determines that a pick-up delay jam has occurred if the
paper has not reached the registration paper sensor (PS302) within a
specified period of time after the feed solenoid is engaged.
J2013-6
-7
-2
-1
Fixing unit motor
M2
-3
-4
-5