Lincoln Impinger Conveyor Ovens 1100 Series - Manual (Page 33)

display. If the readings do not match, replace
thermocouple probe.
Power Supply If strange or unusual behavior is experienced
such as a rolling of numbers, or lock up at a
given number, first check for a display circuit lock
up. This can be caused by a voltage spike or
surge in the incoming power lines. To eliminate
this condition remove power from the time/temp.
display by shutting off the main fan
switch for 15 seconds, or if display stays on,
(older models) circuit breaker interruption may be
required. This should eliminate the problem. If
the problem continues, jumper the two fuses in
the red wires leading from the 12.6 VAC trans-
former to the display on older units.
If this does not solve the problem,
it may be coming in through the
commercial power lines. Suggest
that customer contact his power
company for evaluation.
Temp Display Perform the power supply check,
inaccurate, erratic, the thermistor probe check, and
or inoperative then perform the time/temp
simulator test. Refer to Section D for
instructions. Remember, when
using the time/temp simulator,
remove all the leads from the
back of the display except the 3
power leads. After completion of
this test and if reinstalling display back
into the oven, the dip switches
must be reset for oven operation.
S/N 2011821 & Time Display Perform all checks as in the above
Above, See Pg. 45 inaccurate, erratic, evaluation. If the time check is
or inoperative okay, refer to the next section -
optical encoder.
Optical Encoder The above time/temp test should
have already been performed.
Remove the 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 light beams to be
broken by the encoder disc.
If all this is okay, then replace the
optical encoder assembly.
Impinger II - 1100 Series Service Manual - International 33