Scotsman ND750 Service Manual page 22

ND750
SERVICE DIAGNOSIS: Condition - Poor or No Ice Dispensing
STATUS: There is power to the unit, but no ice is dispensed
A. Check for ice in the bin, if no ice, check the ice making system.
If the ice making system is normal, the demand for ice may exceed the quantity the icemaker cam produce.
Check with the user on ice usage: advise the user that another machine may be needed.
B. Check for motion in the agitator when the glass filler lever is pushed, if no motion: Check the vend
switch, if it does not close when the glass filler lever is pushed, replace the switch.
If the vend switch does close, check for voltage at the agitator drive motor. If there is voltage, and the
agitator motor output shaft does not turn, replace the agitator gear motor assembly.
C. Check that the ice dispensing door opens when the glass filler lever is pushed. If not, check the
vend switch. If the vend switch is good, check the door solenoid.
If the agitator moves when it is supposed to, and there is ice, the dispensing cycle should be fine.
is dispensed, check for an obstruction in the ice chute.
D. No portion control.
1. Continuous dispensing when the glass filler lever is pushed in: Check for an open potentiometer (portion
control). If open, replace it.
If it is not open, replace the portion control module in the control box.
2. Very short dispensing: Check for a shorted potentiometer (portion control). If shorted, replace it.
If it is not shorted, replace the portion control module in the control box.
January, 1989
Page 22
If no ic