6. Ten seconds later, the pump relay closes.
7. Three seconds later, the pump relay opens and the
mix light turns off.
8. Ten seconds later, the beater motor relay
closes.
9. Three seconds later, the beater motor relay opens
and the STANDBY light turns off.
10. Ten seconds later, the compressor relay closes.
11. Three seconds later, the compressor relay
opens and the wash light turns off.
12. All lights are off and a tone sounds for three
seconds. This designates the end of the first
section.
If all or most of the power board relays fail to close, the
logic panel is defective. If only one relay fails to close, the
power board is defective. This test can be used to
determine if a problem exists with the logic panel, the
power board, or elsewhere in the freezer. In other words,
if during the test the beater relay closes on the power
board, but the beater motor contactor does not operate,
the problem occurs after the command reaches the power
board.
Self-Test - Part II
When the first section of the self-test is complete, the
control will advance to the starting point of the second
section. The technician will have to complete this portion
of the test. The first part of this section verifies the
function of the control potentiometers (adjustment screw).
During this test, the MIX, STANDBY, WASH, AUTO, and
PUMP lights function in direct relationship with the "MIN"
and "MAX" adjustments of the potentiometer. In other
words, when the adjustment screw is turned all the way to
"MIN", the MIX light will be lit. When the adjustment is
turned all the way to "MAX", the PUMP light will be lit. If
the screw adjustment is made between the "MAX" and
the "MIN" adjustment, one of the other lights will
illuminate depending on the adjustment.
These lights create a bar graph which is directly related to
the product temperature. "MIX" is warm and "PUMP" is
cold.
1. The SET POINT light is lit, indicating that the control
is reading the soft serve viscosity potentiometer.
2. Rotate the adjustment screw back and forth from
"MIN" to "MAX". The bar graph should travel
accordingly. This indicates that the potentiometer is
functional.
If the bar lights do not react, the logic panel is
defective.
Important: If the freezer's controls have been
set previously, return the adjustment to its original
position. For example, if the WASH light was lit before an
adjustment screw was rotated, before going to the next
step, rotate the adjustment screw until the WASH light is
lit again.
3. Press the MIX keypad once.
4. The MIX LOW light is lit, indicating that the control is
reading the MIX potentiometer.
5. Rotate the adjustment screw as in Step 2,
6. Press the MIX keypad once.
7. The MIX OUT light is on, indicating the control is
reading the STANDBY potentiometer.
8. Rotate the adjustment screw as in Step 2.
9. Press the MIX keypad once.
10. The MIX LOW light is lit, indicating that the control
is reading the "MIX 1" terminal.
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