4-78 Phaser 8400/8500/8550 Color Printer
Testing Motor and Solenoid Resistances
1. Turn off the printer and disconnect the power cord.
2. With a DMM set for measuring resistance, test each motor's windings for correct
resistance (disconnected from the printer). Rotate the motor's drive shaft slightly
while taking the measurement.
Motor and Solenoid Resistances
Motor or Solenoid Resistance (Approximate)
Process motor 4.3 ohms +/-15% (Difficult to measure due to variability at
the brush/commutator interface.)
Y-axis motor 1.4 ohms +/- 15% (Difficult to measure due to variability
at the brush/commutator interface.)
X-axis motor 12.5 ohms/phase (red-to-yellow and blue-to-orange)
Media path motor 1.5 +/- 20% ohms
Wiper drive clutch 186 ohms +/- 15%
Paper-pick clutch
Deskew clutch
186 ohms +/- 15%
MPT Pick solenoid 124 ohms +/- 5%
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