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Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-67
General Troubleshooting
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 Drive 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 Drive 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%