Tektronix PHASER 380, Service Manual

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6-10
Phaser 380 Color Printer
6
Troubleshooting
Testing motor and solenoid resistances
1. Turn off the printer and disconnect the power cord.
2. With a VOM 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 wire to
wire. All motors and solenoids should be open circuit to ground.
In general, if you measure any low resistance from a motor winding to ground
while the motor is installed, replace that motor.
Table 6-4 Motor and solenoid resistances
Motor or solenoid Resistance (approximately)
Process motor 3 ohms
Y-axis motor 2 ohms
X-axis motor 60 ohms/phase
Cap/wipe/purge assembly motor 80 ohms/phase
Media width sensor motor 15 ohms/phase
Head-tilt solenoid 45 ohms
Paper-pick solenoid 45 ohms
Transfix cam solenoid 45 ohms
Air valve solenoid 150 ohms
Maintenance tray camshaft electric clutch 150 ohms
Upper feed roller electric clutch 150 ohms
Lower feed roller electric clutch 150 ohms