Xerox Phaser 8500, Service Manual

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4-44 Phaser 8400/8500/8550/8560 Color Printer Service Manual
General Troubleshooting
This test turns on the process motor and runs it very slowly for one revolution.
This test turns on the media path motor and runs it very slowly for one
revolution.
Process Motor
R# Definition
Typical
Value
(8400) Typical
Value (8500/
8550/8560)
Actions
0 Motor fe ripple
(ticks) 2.8 to 6.0 0 to .02 Reports amount of variation of
the motor following error.
1 Motor fe average
(ticks) -4 to 3.0 .015 to .01 Reports the motor following
error average value.
2 Motor drive voltage
ripple (volts) 5 to 11 8 to 11 Reports amount of variation of
the motor drive voltage.
3 Motor drive voltage
(volts) 1.3 to 2.3 .9 to 1.5 Reports the motor drive
voltage average value.
4 Motor drive power
ripple (watts) 1.03 to 3.6 .7 to 2.0 Reports amount of variation of
the motor drive power.
5 Motor drive power
average (watts) 1.5 to 3.5 1.2 to 2.75 Reports the motor drive power
average value.
Media Path Motor
R# Definition
Typical
Value
(8400)
Typical
Value (8500/
8550/8560)
Actions
0 Motor fe ripple
(ticks) .40 to 1.3 .001 to .0035 Reports amount of variation of
the motor following error.
1 Motor fe average
(ticks) 0.8 to 2.0 .0033 to .007 Reports the motor following
error average value.
2 Motor drive voltage
ripple (volts) 4 to 10 4 to 8 Reports amount of variation of
the motor drive voltage.
3 Motor drive voltage
(volts) -5.5 to -2.0 -5 to -2.0 Reports the motor drive
voltage average value.
4 Motor drive power
ripple (watts) 0.8 to 6 .8 to 3.9 Reports amount of variation of
the motor drive power.
5 Motor drive power
average (watts) 1.9 to 7 2 to 8 Reports the motor drive power
average value.