21
Models C706 & C707
Controls
Service Tips for Generation II Boards
Initial Service Tips
1. Check all connections.
2. Check the cable to verify that it is secure.
3. Verify that all pins are securely fastened in their
sockets.
4. Verify that all cables correctly face away from
the boards. If the cable is attached incorrectly,
damage to the logic board will occur. Air/mix
pump and beater motor operation will be
disabled.
5. Verify probe resistance.
6. Use the self-test program.
Self- Test Program
The Generation II controls are programmed for a
self-test. The control can be used to help identify
problems in the power board, the logic board, and the
thermistor probes. The self-test program is not
intended to, and will not take the place of a reasonable,
and prudent service technician.
The self-test program is divided into two sections. The
first section is an automatic function of the micro
processor and the second section is performed by the
technician.
The self-test program is initiated by holding down the
MIX, WASH, AND PUMP keys on the logic panel while
simultaneously turning on the power switch. Hold
down the keys until all eight lights illuminate. If all eight
lights do not illuminate, the control is defective. If the
self-test cannot be initiated, the control is defective.
WASH AUTO PUMP
MIX OUT
MIX LOW
MIX STANDBY
13113
(SET POINT)
Figure 8
Each light corresponds with a particular relay. The light
on the panel will not extinguish until the test is
completed for that particular relay.
Logic Panel Light Corresponding Relay
MIX LOW Mix Relay
MIX OUT Fan Relay
MIX REF Pump Relay
STANDBY Beater Motor Relay
WASH Compressor Relay
AUTO Spinner Relay
PUMP Portion Relay
In each of the tests the relay on the power board will
close and the component will operate for three
seconds. There is a ten second delay between each
check.
When the self-test is initiated, all eight lights will remain
on for three seconds. At this time, the processor will
begin to check the power board relays as follows:
1. The SET POINT light turns off.
2. Ten seconds after the SET POINT light turns
off, the mix relay closes for three seconds.
3. The mix relay opens and the MIX LOW light
turns off.
4. Ten seconds later, the fan relay closes.
5. Three seconds later, the fan relay opens and
the MIX OUT light turns off.
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