Lincoln Impinger Conveyor Ovens 1634-000-EA - Manual (Page 9)

Low Profile – 1600 Advantage Series Service Manual – International 9
as needed.
Temperature regulation If supply voltage is present on the
valve temperature control board at the load
terminals #7 and #8, check for voltage
at temperature regulation valve. If
voltage is present, listen for valve to
open and close. Also, check for opens
or shorts in the coil. Replace if required.
Intermittent heating Thermal overload of The main fan motors and the burner
main fan and burner blower motors are equipped with
blower motors internal thermal protection and will
cease to operate if overheating occurs.
As the motors overheat and then cool,
this will cause the units to cycle on
and off intermittently. This may be
caused by improper ventilation or lack
of preventive maintenance. Also, most
of the problems listed under “Oven
will not heat” can cause intermittent
failure.
Conveyor will not run Power supply Check for supply voltage at terminals
L1 and L2. If voltage is not present,
check breakers.
Fan switch See procedure for checking on page 6.
Fuse, 10 Amp. Check and/or replace.
Fuse holder Check and/or replace.
Filter E.M.I. Check for supply voltage input to
filter. If there is no voltage, trace wiring
back to relay. If there is input voltage,
check for output voltage. If there is
input voltage but no output voltage,
replace filter.
Speed adjustment This is a 0 to 10K ohm, 1 turn
potentiometer potentiometer. With power off, remove
the black and white pot leads from the
conveyor control board at terminals
P1 and P2. Place the meter leads on
black lead (P2) and the white lead (P1).
Rotating the pot. slowly, from low to
high, the meter reading should show
an even transition from 0 to 10K ohms
± 5%. There should be no dead or open
spots through the one turn of the pot.
Check both leads to ground. There
should be no continuity to ground.
If any of the above fail, replace
the potentiometer.
D.C. motor Check for supply voltage input to
control board the control board at terminals L1 and L2
If not present, check wiring back to
the filter. If supply voltage is present,
check both fuses on the control board
( 8 Amp. line and 1Amp. armature).
Check the D.C. voltage output at
terminals A+ and A-. If A.C. voltage
is at terminals L1 and L2, and no
D.C. voltage is present at A+ and A-,
replace control board. If A.C. voltage is
present and D.C. voltage is present but
the motor will not run, check gear motor
as follows:
Conveyor If D.C. voltage is present at A+ and A-