Service Manual
6-7
Troubleshooting
6
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. Also
carefully inspect each motors wiring harness to ensure it is not
damaged and shorting out to the chassis.
In general, if you measure any abnormally low resistance from a motor winding
to ground while the motor is installed (and its wiring is not damaged), replace
that motor.
Table 6-1 Motor and solenoid resistances
Motor or solenoid
Resistance (approximately)
X-axis motor
Pin1 to 2 — 10 to 30 ohms
Y-axis motor
Pin1 to 2 — 3 ohms
Fuser motor
Pin1 to 2 — 5.5 ohms
Exit motor
Pin 1, 2 to 3, 4, 5 or 6 — 10 to 15 ohms
Head maintenance cam gear motor
Pin 1, 2 to 3, 4, 5 or 6 — 27 to 33 ohms
Head-to-media motor
Pin 1, 2 to 3, 4, 5 or 6 — 27 to 33 ohms
Ink stick load motor
Pin 1, 2 to 3, 4, 5 or 6 — 27 to 33 ohms
Printhead door open motor
Pin 1, 2 to 3, 4, 5 or 6 — 27 to 33 ohms
Clamp rotate solenoids
10 to 15 ohms
Clamp close solenoids
10 to 15 ohms