Checking The Paper-Feed Motor And Drive Train - Tektronix Phaser 440 Service Manual

Checking the paper-feed motor and drive train

1.
Determine if the paper-feed motor runs. If it does not rotate, go to
Step 2. If it does rotate, go to Step 5.
2. Ensure that the top and front cover safety interlock switches are closed
and operating correctly. Refer to the earlier topic "+24 VDC safety
interlocks" on page 6-6.
3.
Measure to determine if +24 VDC is being supplied to the motor. If it
is, go to Step 4. If it is not, inspect the paper-feed motor's wiring
harness. If the harness is good, then troubleshoot the power supply.
Refer back to the topic "Verifying power supply operation" on
page 6-3.
4. Disconnect the motor's wiring harness. Measure the resistance of the
motor's windings. The expected resistances are listed in Table 6-1
"Motor and solenoid resistances," on page 6-8. If the windings are
opened, shorted or far out of tolerance, replace the motor.
5. If the motor windings resistance are within specification, then inspect
the wiring harness for nicks, crimps, opens or other problems. If the
harness checks out, then replace the engine control board.
6.
Remove the paper-feed module. Inspect the gear train on the inside of
the printer frame; look for stripped gears or broken teeth.
Troubleshooting
Service Manual 6-11
6