Ricoh M126 - Media Picks but Stops Halfway through the Machine

M126/M127/M128 6-66 SM
Media picks but stops halfway through the machine
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 +5Vdc on pin 2 and 5 at J27 on the engine board
(input/duplex sensors) and pin2 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.