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Troubleshooting 4-67
NovaJet 800 Series Service Manual
Loading Media Failure
The carriage paper sensor (infrared sensor) will first obtain a reference
at right side of media surface after load media is selected (or during
autoload), then measure for media front edge detection (roll 1, roll 2, and
sheet modes only), then measure media left edge detection second, then
media right edge detection last. If the carriage stops at front edge, and
the media rolls out in front of the printer continuously then the paper
sensor is malfunctioning. This is probably due to ink covering the platen
surface or the sensor optics, either on the LED (XMTR) or Sensor
(RCVR). Clean the platen surface thoroughly or the sensor optics
(located directly behind the right carriage magenta cartridge flex cable) or
remove the carriage assemblies and replace the paper sensor.
Failure Analysis:
1. Ink on platen surface is typically the cause of sensing failures.
Switch to take-up mode to verify failure. If take-up sensing is OK,
then the platen is the problem. The platen may have ink on
surface or the surface is damaged (tiny cuts in the painted surface
exposing the shiny metal underneath)
2. Curl in media at left or right edge (vinyl/canvas exposed to high
humidity). Certain types of translucent bond media cannot be
detected properly.
3. Scratches or ink (dirt or debris) on platen surface. Often the
printer suffers cuts in the painted surface from the use of a knife to
cut media.
4. Buffed platen surface (some textile and heavy bond media is
known to have caused this problem) which creates a shiny surface
and interferes with normal sensor operation.