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e. You also should be able to measure VDD2 and VDD3 at test point
TP2 and TP3 respective.
f. Depress, and release switch S1, and measure the remaining listed
voltages.
Table 6-3:
Test Point:
TP0
TP1
TP2
TP3
TP4
TP5
TP6
TP7
If the above test is not successful you may have to replace the Electronics
Unit, or the Electronics Unit's motherboard.
g. If the above voltages can be measured following the procedure
above, and communication can still not be established successfully,
the problem may still be a faulty communication line, or a faulty
Electronics Unit motherboard.
ADFM Technical Manual (January 2000)
List of Test Points
Label:
Description:
GND
Electrical Ground
VDD1
Main supply of electronics
VDD2
Nonvolatile electronics
supply
VDD3
Auxiliary supply
VCC
Receiver supply
VR1
Reference voltage
VXMT
Transmitter/Transducer
supply
VPWR+
Raw power supply
ADFM Troubleshooting
Voltage:
0 V
5.0 ± 0.15 VDC
5.0 ± 0.15 VDC
16.0 ± 1.50 VDC
5.0 ± 0.15 VDC
2.50 ± 0.015 VDC
5.0 ± 0.15 VDC
28 ± 3.0 VDC @ Mains
Vbatt - 2 VDC @ DC
page 6-9
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