Scotsman ND650 Service Manual page 25

ND650
SERVICE DIAGNOSIS: Condition - Poor or No Ice Dispensing
STATUS: There is power to the unit, but no ice 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
dispenser can 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 pushes in the actuator button, replace the switch.
1. If the vend switch does close, check for voltage at the agitator drive motor: if none,
replace the portion control module in the control box. If there is voltage, and the agitator
motor output shaft does not turn, replace the agitator gear motor assembly.
If the agitator moves when it is supposed to, and there is ice, the dispensing cycle
should be fine. If no ice is dispensed, check for an obstruction in the ice chute.
C. 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.
March, 1989
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