FTS-3 Fetal Telemetry System Service Manual
Modules
’ Malfunction Verification
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Chapter 9 Modules
’ Malfunction Verification
When a module is suspected of malfunction, verify it with the method described in this chapter.
NOTE:
For all the interfaces, the first pin is the one with a square solder pad.
9.1 Verifying Malfunction of the Main Board
To verify the main board,
1)
Open the base station using the procedures described in section 10.3.
2)
Switch on the base station. (Powered by AC or battery.)
3)
Measure the voltage to earth of the pins listed below, using a multimeter:
Item
Pin
Reference result
○
1
TP1
+5V5 (
4.95~6.05
) V
○
2
TP4
+3V
（
2.7~3.3
）
V
○
3
TP5
+2V5 (2.25~2.75) V
○
4
TP9
RF_3V3
（
2.97~3.63
）
V
○
5
TP10
VCC (2.97~3.63) V
○
6
TP11
+5V (4.5~5.5) V
Figure 9- 1
Main Bboard
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