E) Freeze Timer (Dip Switch 9 & 10); Control Board Check Procedure - Hoshizaki KM-1601SWH Service Manual

e) Freeze Timer (dip switch 9 & 10)
Adjust to proper specification, or the unit may not operate correctly.
The freeze timer setting determines the maximum allowed freeze time to prevent
possible freeze-up issues. Upon termination of freeze timer, machine initiates the harvest
cycle. After 2 consecutive timer terminations, machine will shut down, possibly indicating
a problem.
The freeze timer is factory adjusted and no adjustment is required.

4. Control Board Check Procedure

Before replacing a control board that does not show a visible defect and that you suspect
is bad, always conduct the following check procedure. This procedure will help you verify
your diagnosis.
1) Check the dip switch settings to assure that #3, 4, 7, 8, 9, & 10 are in the factory
default position. On units with a slide-type output test switch, the output test switch (S3)
should be in the "OFF" position. Switches 1, 2, 5, & 6 are cleaning adjustments and the
settings are flexible.
2) Turn the control switch to "ICE" and check for proper control voltage. If the red LED
is on, the control voltage is good. If the red LED is off, check the control transformer
circuit.
3) Check the 115 volt input at the 10-pin connector. Check the brown wire at pin #10 to a
white neutral wire for 115 volts. (Always choose a white neutral wire to establish a good
neutral connection when checking voltages.) A jumper also feeds 115 volts into pin #7.
If no voltage is present, check the 115 volt supply circuit.
4) The output test switch provides a relay sequence test. On units with a slide-type output
test switch, move the control switch to the "OFF" position, move the output test switch
to the "ON" position, then move the control switch to the "ICE" position. On units with a
push-type output test switch, make sure the control switch is in the "ICE" position, then
press the output test switch. The correct lighting sequence should be none, 2, 3, 4, 1,
and 4, normal sequence every 5 seconds. Some components (e.g., the compressor)
will cycle during the test. Note that the order of the relays from the outer edge of the
board is 1, 4, 3, 2.
Note: If the LEDs light in a different sequence, the control board is bad and should be
replaced.
5) After checking the sequence, place the output test switch back in the "OFF" position
on units with a slide-type switch. The output test switch must remain in the "OFF"
position during normal operation. On units with a push-type output test switch, the unit
automatically resumes normal operation after the test. The unit begins normal operation
with the 1 minute fill cycle.
CAUTION
Dip Switch Setting
No. 9 No. 10
OFF OFF
OFF ON
ON OFF
ON ON

Time
(minutes)
60
50
70
60