ADJUSTMENT - TM-55-1730-228-13-P0219

TM55-1730-228-13&P

4-10. JUNCTION BOXES - ADJUST (Continued)

4-10

c. Using a multimeter, place negative (-) probe at ground and positive (+) probe at "B" terminal on circuit board

(1) Engage DRIVE toggle and pull handle to reverse just past the point at which a reading occurs on the meter.

Hold handle in this position.

(2) Adjust LOW (LO) trim pot to 5 volts. (Clockwise increases voltage, counterclockwise decreases voltage.)

(3) Push handle full forward.

(4) Adjust HIGH (HI) trim pot to 12 volts.

d. Using a multimeter, place negative (-) probe at ground and positive (+) probe on the "A" terminal on the circuit

board.

(1) Engage drive toggle and push handle full forward.

(2) Adjust HIGH (HI A) trim pot to 12 volts.

e. Start the SPEMS and raise the platform off the scissors position limit switch.

(1) Drive the SPEMS over a smooth, measured level course in full reverse and measure elapsed time. The

desired speed is 1 foot per second (ft/sec).

(2) Adjust the HIGH trim pot to 1 ft/sec. (Clockwise increases speed, counterclockwise decreases speed).

(3) Over the same course, measure elapsed time in full forward. Desired speed is 1 ft/sec.

(4) Adjust HIGH (HI) trim pot to 1 ft/sec. (Clockwise increases speed, counterclockwise decreases speed.)

f. Check adjustments in the following sequence: LOW, HIGH, HIGH-A (Note: Adjustment of one pot may affect the

others; therefore several times through may be anticipated).

(1) Desired readings are:

(a) LOW - 5V at point meter first records a reading.

(b) HIGH - 1 ft./sec. travel speed with platform raised.

(2) If all adjustments are correct, then adjustment is complete.

(3) If any adjustment is necessary, repeat step f.

g. Operational test for proper function.

END OF TASK

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