Specifications

6-36 888-2500-001 5/2/2013
WARNING: Disconnect primary power prior to servicing.
DAX-1/DAX-3
Section 6 Troubleshooting
6.9 Testpoint Listing
The following table lists the pertinent testpoints and LEDs for each board of the DAX
transmitter and provides its function and nominal value when applicable.
NOTE:
Ground test points are not listed, however, be sure to use correct ground type if
multiple ground types are noted.
Table 6-2 DAX Testpoint & LED Information Table
(All voltages listed are ±5%)
On Board... Name TP(n)
or
LED
Function, Display
and/or
(Comment) or (Related Potentiometer)
Nominal
Value
External I/O AC LOW TRIP TP6 Factory threshold adjust for AC Low
Trip (R107)
2.88Vdc
±0.05V
External I/O +4.096VREF TP7 Onboard regulation - zener +4.096
Vdc
External I/O (-) AUDIO
(+) AUDIO
TP10
TP11
Audio input level
Audio input level
< 12V
< 12V
External I/O +12V TP12
DS5
Onboard regulation - zener
Green LED illuminates to indicate
+12V supply present
+12Vdc
External I/O -12V TP14
DS6
Onboard regulation - zener
Green LED illuminates to indicate -
12V supply present
-12Vdc
External I/O +28V TP15
DS7
Onboard regulation - zener
Green LED illuminates to indicate
+28V supply present
+28Vdc
External I/O +48V TP16
DS8
Input from LVPS
Green LED illuminates to indicate
+48V supply present
+48Vdc
External I/O +5V TP17
DS9
Onboard regulation - IC
Green LED illuminates to indicate +5V
supply present
+5Vdc