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Page Title:
Figure 3-17. Power switch module, exploded view. |
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 1.
Nut (2)
12.
Washer (4)
2.
Lock washer (2)
13.
Screw (4)
3.
Washer (2)
14.
Transistor (2)
4.
T'ransist4or (2)
15.
Heat sink
5.
Nut (2)
16.
Lead (2)
6.
Lock washer (2)
17.
Spacer (2)
7.
Washer (2)
18.
Resistor.0.3 ohm (2)
8.
Screw(2)
19.
Resistor
22 ohm (2)
9.
Heat sink (2)
20.
Resistor
100 ohm (2)
10.
Nut (4)
21.
Resistor
220 ohm (2)
11.
Lock washer (4)
22.
Printed wiring board
Figure 3-17. Power switch module, exploded view.
g. Transistor Tests
an ohmmeter to test each power and drive transistor, as
follows: (fig. 3-18.)
(1) To determine a shorted or open condition, use
Negative Lead
Positive Lead
Resistance
Emitter
Collector
High resistance
Collector
Emitter
High resistance
Base
Emitter
Low resistance
Emitter
Base
High resistance
Base
Collector
Low resistance
Collector
Base
High resistance
3-28
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