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Impinger I -–1000 Series Service Manual - International 67
4 A. FUSE 1 A. FUSE
.
RESISTOR
L 1 A+
L 2
A -
T 1 T 2MAX MIN IR CL TACH
BOARD P/N 369155
STYLE 1
P 3
P 2
P 1
4 A. FUSE 1 A. FUSE
L 2
A -
MAX MIN IR CL TACH T 1 T 2
L 1 A +
" B " BOARD P/N 369272
P 3
P 2
P 1
CHOKE
STYLE 2 AND STYLE 3 CONTROL BOARD ADJUSTMENT
NOTE: A digital meter must be used.
Voltage at L1 and L2 terminals of the control board is to be 120 VAC± 10%.
Connect a digital voltmetet to terminal T1 and T2, set the meter on DC scale.
Turn speed control pot. (on oven control panel) to its maximum speed setting.
Adjust the "MAX" pot. so the voltmeter indicates 22.6 to 22.8 VDC.
Turn the speed control pot. to its minimum speed setting.
Adjust the "MIN" pot. so the voltmeter indicates 1.4 to 1.5 VDC.
Reset the speed control pot. to its maximum speed setting and check if voltage is still at 22.6
to 22.8 VDC. Readjust if necessary.
Reset the speed control pot. to its maximum speed setting and check if voltage is still at 1.4 to
1.5 VDC. Readjust if necessary.
If readjustment of either the "MAX" or "MIN" pot. was necessary, the opposite must always be
checked until both "MIN" and "MAX" are in proper adjustment.
Measure the speed of the conveyor and adjust the time/temp. display if necessary.
Seal pots with Glyptol or nail polish.
NOTE: Occasionally a new board (Style 2 and 3 only) is so far out of adjustment that you will be
unable to adjust the correct voltage. To correct, turn both the "MAX" and "MIN" pots 10 turns in
either direction and then 5 turns in opposite direction. This will center the
pots and allow them to be calibrated. If after this procedure, the board will not adjust,
it is probably defective.