Dc Power Supply; Figure 9-5: Location Of Dc Power Test Points On Relay Pca; Table 9-8: Dc Power Test Point And Wiring Color Codes - Teledyne T700 Operation Manual

Teledyne API – Model T700 Dynamic Dilution Calibrator

9.4.3. DC POWER SUPPLY

06873E DCN7106
If you have determined that the calibrator‟s AC mains power is working, but the unit is
still not operating properly, there may be a problem with one of the instrument‟s
switching power supplies. The supplies can have two faults, namely no DC output, and
noisy output.
To assist tracing DC Power Supply problems, the wiring used to connect the various
printed circuit assemblies and DC Powered components and the associated test points on
the relay PCA follow a standard color-coding scheme as defined in Figure 9-5 and Table
9-8.
TP1 TP2 TP3 TP4
DGND +5V AGND +15V -15V +12R 12V

Figure 9-5: Location of DC Power Test Points on Relay PCA

Table 9-8: DC Power Test Point and Wiring Color Codes

NAME TEST POINT#
Dgnd
+5V
Agnd
+15V
-15V
+12R
+12V
A voltmeter should be used to verify that the DC voltages are correct per the values in
Table 9-9, and an oscilloscope, in AC mode, with band limiting turned on, can be used
to evaluate if the supplies are producing excessive noise (> 100 mV p-p).
TP5 TP6 TP7
TP AND WIRE COLOR
Black
1
Red
2
Green
3
Blue
4
Yellow
5
Purple
6
Orange
7
Troubleshooting and Service
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