Xerox Phaser 8860, Service Manual

Page: 235 / 316

09/2007
6-15 Phaser 8860/8860MFP Service Manual
Print Engine Check Menu Tests
Diagnostics Initial Issue
Tray 2~4 Pick Clutch Tests
These tests briefly energize the Tray 2, 3, or 4 Pick Clutch and measures parameters. Peak
power is expected to be very close to the average power level. An appreciable deviation could
indicate a variation in the supply voltage or coil resistance, possibly due to heating during the
test. A change in heating behavior could indicate a problem with cooling or the thermal conduc-
tivity through the mounting. Deviations from typical average values could indicate voltage sup-
ply problems, and/or unexpected resistance.
Head Tilt Solenoid Test
This test briefly energizes the Head Tilt Solenoid and measures parameters. The solenoid is
activated for a short time at both the high and low power levels while the power is measured.
The peak power level is expected to be constant during the On High intervals. Therefore, peak
power is expected to be very close to the average power level. An appreciable deviation could
indicate a variation in the supply voltage or coil resistance, possibly due to heating during the
test. A change in heating behavior could indicate a problem with cooling or the thermal conduc-
tivity through the mounting. The Low power level is generated via a software controlled voltage
signal. The presence of any intermediate value indicates that the drive circuitry is operating
correctly. The Preheater plates should not relax when the power level drops to low.
Purge Vent Solenoid Test
This test briefly energizes the Purge Vent Solenoid and measures parameters. Peak power is
expected to be very close to the average power level. An appreciable deviation could indicate a
variation in the supply voltage or coil resistance, possibly due to heating during the test. A
change in heating behavior could indicate a problem with cooling or the thermal conductivity
through the mounting. Deviations from typical average values could indicate voltage supply
problems, and/or unexpected resistance.
Drum Heater Relay Test
This test briefly energizes both relay coils of the Drum Heater Relay Board and measures
parameters. Peak power is expected to be very close to the average power level. An apprecia-
ble deviation could indicate a variation in the supply voltage or coil resistance, possibly due to
heating during the test. A change in heating behavior could indicate a problem with cooling or
the thermal conductivity through the mounting. Deviations from typical average values could
indicate voltage supply problems, and/or unexpected resistance
Shafts Menu
Runs the selected shaft in both directions to determine shaft characteristics, steady state drive
requirements, bearing status, etc. The objective of these tests is to perform dynamic testing of
the engaging clutch.
Deskew Shaft Test
This test attempts to determine if the deskew shaft is controllable and is operating normally.
The deskew shaft is first driven for a short time to loosen up the gears/bearings and run any flat
spots out of the rollers. Then the Media Drive Assembly is started and run for a short time with-
out the deskew shaft. Next, the deskew clutch is engaged "on the fly". After a short time, the
clutch is released and the Media Drive Assembly is stopped. This process repeats for the
opposite direction of deskew shaft rotation. The response of the system to the clutch engage-
ment/disengagement should show the clutch characteristics. The steady state drive require-
ments indicate bearing status and the condition of the rollers, flat/dirty, bent shafts, etc. The
data used is the Media Drive Assembly servo system following error (fe), which is a measure of
how hard the system is working at any point in time.
Table 6 Tray 2 ~ 4 Pick Clutch Nominal Values
R# Characteristic Typical Value Result
0 Peak Power (Watts) N/A Reports the profile maximum power.
1 Average Power (Watts) N/A Report the average power during the
constant portion of the part’s profile.
Table 7 Head Tilt Solenoid Nominal Values
R# Characteristic Typical Value Result
0 Peak High Push Power
(Watts) N/A Reports the power ON high peak power.
1 Average High Push Power
(Watts) N/A Report the power On high average
power.
2 Average Low Push Power
(Watts) N/A Reports the power On low average
power.
Table 8 Purge Vent Solenoid Nominal Values
R# Characteristic Typical Value Result
0 Peak Power (Watts) N/A Reports the profile maximum power.
1 Average Power (Watts) N/A Report the average power during the
constant portion of the part’s profile.
Table 9 Drum Heater Relay Nominal Values
R# Characteristic Typical Value Result
0 220V Coil Peak Power
(Watts) N/A The profile maximum power.
1 220V Coil Average Power
(Watts) N/A The average power during the constant
portion of the part’s profile.
2 110V Coil Peak Power
(Watts) N/A The profile maximum power.
3 110V Coil Average Power
(Watts) N/A The average power during the constant
portion of the part’s profile.
Table 10 Deskew Shaft Nominal Values
R# Characteristic Typical Value Result
0 Time to CCW On peak fe
(sec) N/A Reports how long it takes the Media
Drive Assy servo system to react to the
sudden addition of the deskew shaft
load. Larger values may show a slipping/
slow to engage clutch.
1 CCW On peak fe N/A Reports peak effort needed to accelerate
the deskew shaft load. A smaller value
could indicate a slipping clutch.