Print Transfer Jams; Checking The Process Motor And Drive Train - Tektronix Phaser 340 Service Manual

4. Check that the pick roller is being rotated. If it is not, go to the topic
"Checking the process motor and drive train" on page 6-11.
Otherwise, go to Step 5. In its starting position, the pick roller's flat
side should face down; the flat, keyed end on the left end of the pick
roller shaft faces up.
5.
Clean the pick roller. Paper dust can coat the pick roller and affect its
ability to grip the paper and pull it out of the tray.
6. Refer to the later topic "PC-based diagnostics" on page 6-27. Use the
motor and solenoid test to check the operation of the paper pick
system.
7.
Inspect the wiring harness leading to the paper transport clutch for
nicks, cuts or crimped wiring. Ensure the connector is seated.
8. Inspect the paper-feed module for obstructions.

Print transfer jams

1. Test the paper preheater sensors. Refer to the later topic, "PC-based
diagnostics" on page 6-27. If the sensor fails the test, replace the paper
pre-heater.
2. Check to see if the upper feed roller drive belt is broken or slipped off
of its pulleys. In such a case, the upper roller does not rotate when the
lower roller rotates.
3. Inspect the idler rollers on the inside of the top-front cabinet panel;
they should rotate freely.
4.
Check that the feed rollers rotate smoothly and that the front cover is
fully closed and seated.
5. Check the paper-eject path for obstructions.

Checking the process motor and drive train

1. Determine if the process motor runs. If it does not rotate, go to Step 2.
If it does rotate, go to Step 5.
2. Measure to determine if +40 VDC is being supplied to the motor. If it
is, go to Step 4. If it is not, inspect the process motor's wiring harness.
If the harness is functional, then troubleshoot the power control board
and power supply. Refer back to the topic, "Verifying power supply
operation" on page 6-5.
3.
Disconnect the motor's wiring harness. Measure the resistance of the
motor's windings. The expected resistances are listed in Table 6-3
"Motor and solenoid resistances," on page 6-9. If the windings are
opened, shorted or far out of tolerance, replace the motor.
Troubleshooting
Service Manual 6-11
6