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4-20 Phaser 8400/8500/8550/8560 Color Printer Service Manual
General Troubleshooting
Test is the same for each pick shaft although for Tray 2 the Media Path Drive
motor is used and for the 525-sheet feeders the corresponding pick/transport
motor is used. Test determines if the shaft can be driven by the clutch, if the
nudger rollers are being driven, and the pick pad/nudger roller friction.
4 Contact average fe. 120 to 2000 Reports the average MP fe
while the pick roller is
contacting the separator pad.
This value should reflect the
coefficient of friction between
the separator pad and the pick
roller. This value may be
effected by contamination or
glazing.
5 Pushdown MP fe
max.
750 to 2000 Reports the peak MP fe during
the interval when the pick
cams are depressing the lift
plate.
A higher value here could
indicate issues with the cam
surfaces or the spring
compression force.
6 Final average MP
fe. (mpts).
900 to 1500 Reports the average MP fe
following the re latching of the
missing tooth gear.
This value should be the same
as R0 if the missing tooth gear
successfully relatched.
Tray 2, Tray 3, and Tray 4 Pick Shaft
R# Definition
Typical
Value
(8400)
Typical
Value
(8500/
8550/8560)
Actions
0 Time to On peak fe
(sec).
Reports how long it takes the
MP motor servo system to
react to the sudden addition of
the Tray 2 pick shaft load.
Larger values may indicate a
slipping or slow to engage
clutch.
1 On peak fe. Reports the peak effort
required to accelerate the Tray
2 pick shaft load. A smaller
value could indicate a slipping
clutch.
Tray 1 Pick Shaft (Continued)
R# Definition
Typical
Value
(8400)
Typical
Value
(8500/
8550/8560) Actions