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 TM 55-1905-217-34
Figure 4-7. Diode testing (hulls 8540-8560 and 8580-8618).
(a) Connect one ohmmeter or test lamp probe to field diode assembly plate and the other probe
to each field diode in turn. The meter indication should be the same for each diode. If one diode results in a
different meter indication, that diode is defective and the complete field diode assembly must be replaced.
(b) Reverse ohmmeter or test lamp leads and repeat step (a). The meter indication should be
opposite to the indication obtained in step (a). Any deviation indicates a defective diode and the complete field
diode assembly must be replaced.
(4) Test each diode in the positive heat sink as described in step (3a). All positive diodes should show
conductivity from one DC polarity and no conduction when the polarity is reversed.
4-11
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