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Test Points and LED’s
Test points and LED’s are very useful for troubleshooting the system. The test
points and LED’s are listed below with a brief description.
Figure 6: Test points and LEDs detail
Component
Test Pt.
Description
UPS
TP29
Power fail signal from external UPS
+5V REF
TP24
Head T/C service reference
Door Switch
TP15
State of the door (open or closed)
On/Off Switch
TP14
State of power down switch
Power Enable
TP8
Enables power to circuitry (normally high)
Model Toggle
TP17
Toggle travel complete
Chamber
Thermocouple
TP28
Voltage corresponds to chamber temperature
(10 mV=° C)
Support
Thermocouple
TP20
Voltage corresponds to support temperature
(10 mV=° C)
Model
Thermocouple
TP22
Voltage corresponds to model temperature
(10 mV=° C)
HD Thermostat
TP25
Chamber and head thermostat (snap
switches)
(+5 VDC if both switches closed)
Normal = tp17 lo, tp19 hi
ch thermostat fault=tp17 lo, tp19 lo.
Head TC Alarm TP26
High if head T/C not plugged in or open
Support Toggle
TP16
Not used
Chamber TC
Alarm
TP27
High if chamber T/C not plugged in or open
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