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Chapter 8: Diagnostic and Repair Procedures
8-15
Power Supply System Troubleshooting
Power supply instability and failures account for many malfunc-
tions. We recommended testing the power supply voltages as a
starting point when troubleshooting. You need a digital voltmeter
with an impedance of at least 20,000 ohms per volt to perform
these procedures.
Testing the Power Supply
1.
Remove the FT-50’s cover to access the power supply inside.
2.
Using test point TP3 as ground, test all voltages at the appro-
priate test points.
Figure8-1.
Power Supply Circuit Board test points.
Reference
Test
Point
Output
VDC
Range
VDC
Xfmr
Winding
Source
Supply
Description
1
TP-6
+5
5.0/5.2
28 VAC
+V
Processor Logic, Scintillation Detector
2
TP-2
+12
11.5/12.5
28 VAC
+V
Scintillation Tube Pulse Preamplifier,
Control Panel, Serial Port Drivers
3
TP-4
+22
18.0/22.0
28 VAC
+V
Sensor Emitters/Amplifiers, Input
Comparators
4
TP-5
12
11.5/12.5
28 VAC
Unreg
Control Panel, Serial Port Drivers
5
J-1
+1000*
800/1200
28 VAC
+22VDC
Scintillation Detector
6
Q8-3‡
-5
4.9/5.1
28 VAC
-12VDC
RS232/RS422 Drivers
7
P4-2
+60
50/60
36 VAC
Unreg
Rejector Driver, Rejector
8
TP-3
Ground
1
4
2
3
8
5
A
B C
D
7
6
Industrial Dynamics Company, Ltd.
Document 40255-0600
Содержание FT-50c
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