Service Tips For Generation Ii Boards - Taylor 336 Service Manual

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 keypads on the logic panel while
simultaneously turning on the power switch. Hold down the
keypads 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.
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
MIX LOW
MIX OUT
MIX
STANDBY
WASH
AUTO
PUMP
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.
Figure 2.
Corresponding Relay
Mix Relay
Fan Relay
Pump Relay
Beater Motor Relay
Compressor Relay
Spinner Relay
Portion Relay