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Phaser 840/850/860/8200 Color Printer - Service Manual
Testing for a shorted motor
1.
Reinstall the power supply if removed in the previous procedure.
2.
Disconnect the process motor, the Y-axis motor, X-axis motor and the cap/wipe/purge
assembly motor wiring harness.
3.
Turn on the printer again to see if it does not overload now that the motors are
disconnected from the power supply.
If the power supply is functional, move to the following procedure, “Testing motor and
solenoid resistances”.
If the motors and solenoids are not shorted, but the power supply still does not function,
replace the power control board.
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.
Table 3-5 Motor and solenoid resistances
Motor or solenoid
Phaser 840 printer
Resistance (approximately)
Phaser 850/860 Printer
Resistance (approximately)
Process motor
2.9 ohms +/-15% (Difficult to
measure due to variability at the
brush/commutator interface.)
4.3 ohms +/-15% (Difficult to
measure due to variability at the
brush/commutator interface.)
Y-axis motor
1.4ohms +/- 15% (Difficult to
measure due to variability at the
brush/commutator interface.)
1.4ohms +/- 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
12.5 ohms/phase (red-to-yellow
and blue-to-orange
Paper-feed motor
1.5 +/- 20% ohms/phase
1.5 +/- 20% ohms/phase
Maintenance drawer
camshaft electric
clutch
186 ohms +/- 15%
132 ohms +/- 15%
Paper-pick electric
clutch
186 ohms +/- 15%
186 ohms +/- 15%
Phaser 850 only
Cap/wipe/purge
clutch, feed clutch
and Phaser 860 pick
clutch.
125 ohms +/- 12%
124 ohms +/- 5%
Transfix cam solenoid
108 ohms +/- 10%
108 ohms +/- 10%
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