Lincoln Impringer Conveyor Oven 1200 - Manual (Page 45)

Impinger I -–1000 Series Service Manual - International 45
Time display inaccurate
erratic, or inoperative Perform all checks as in the above evaluation. If
the time check is okay, refer to the next section
optical encoder.
Optical Encoder The above time/temp test should have already
been performed. Remove dust cover from the
gearmotor and inspect the coupling and encoder
disc. The coupling set screws should be tight and
not slipping on the motor shaft or the tach.
generator shaft. The encoder disc should be firmly
attached to the coupling and not warped. Check the
positioning of the optical encoder disc. The disc
should not be touching the optical encoder
assembly and the encoder assembly should be
mounted so it is squarely facing the coupling shaft.
This is to allow the infrared beams to be broken by
the encoder disc. If all this is okay, then replace the
optical encoder assembly.
Conveyor Drive (Stepper)
Control Perform all checks as in the above evaluation. If
the time check is okay, refer to the next section.
Check to see if the conveyor drive (stepper) motor
is running. If motor is not running, refer to
"Conveyor will not run" on page 43.
Magnet Check to insure that the magnet (cemented to shaft
of conveyor drive (stepper) motor) has not been
damaged, or come loose from motor shaft. Replace
as needed.
Hall Effect Sensor Check for any physical damage to Hall Effect
sensor (mounted on conveyor drive(stepper)
motor). Check all wiring and connections for
damage.
Time Display
inaccurate, erratic, or
inoperative(S/N
Q19078 & Above1000
Series) (S/N Q14791 &
Above1200 Series)
Conveyor Drive (Stepper)
Control Check all connections for tightness or proper
location and check all wiring for visible damage.
Replace as needed. If there is still no time display,
wire in (temporarily) a new conveyor drive control.
If there is still no time display, reconnect original
conveyor drive control. Replace Hall Effect Sensor.