2-44 Service Manual
Media picks but stops halfway through the printer
Media never picks
Media occasionally mispicks or picks multiple sheets at once
FRU Action
Input/duplex sensors
(under print cartridge assembly)
Input sensor (manual)
Stairway cables
Check the stairway cables to verify they are properly connected to the engine
board at connectors J500 and J501, and on the controller board at connectors J26
and J27.
If they are properly connected verify continuity on both cables. If this fails replace
the cables.
Make sure the input sensors are working properly.
Check for a broken or stuck flag on the input sensors. Clear anything that keeps
the flags from rotating freely.
Make sure the cables are seated on the engine board at J27 (input/duplex sensor)
and J23 (manual input).
Check for +5 V dc on pin 2 and 5 at J27 on the engine board (input/duplex
sensors) and pin 2 at J23 on he engine board (Input sensor). Voltages on pins 1
and 4 at J27, and pin 1 at J23 should change as the flags intersect with the sensor.
• If correct, then replace the input paper feed sensor.
• If these voltages are not correct, then replace the controller board.
• Check the pick tires. Clean or replace as necessary.
FRU Action
Paper feed (pick tires) tray 1
Paper feed (pick tires) tray 2
Media drive ASM
Media feed clutch ASM
Manual feed clutch ASM
P/U and manual feed solenoid
ACM drive shaft
Open the left cover, and verify that the solenoids and clutches are functioning
when an attempt is made to feed the media.
Make sure the rubber tires on the ACM are installed and clean.
Replace the tires, ACM drive, clutch assemblies, solenoids, or drive shaft as
necessary.
FRU Action
Tr ay 1
Tray 2 (option)
Check tray for media catch points.
If the sheet being fed stops momentarily, then the ACM applies additional vertical force,
causing additional sheets to feed.
Do not mix media types in one tray.
Paper pick tires
(Tray 1 or tray 2)
Check the tires in the ACM assembly for signs of wear or damage.
Replace the tires as necessary.
ACM clutch
Manual feed clutch
Media feed clutch ASM
(tray 1 only)
Manual feed clutch
solenoid
Open left cover, and observe the solenoid and clutch actions at the ACM and manual feed
shafts as a print job is attempted.
Replace the faulty part.
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