When the ohmmeter battery is reverse biasing the
diode, the resistance reading is much higher. If the
two resistance readings are nearly the same or zero,
Note. The pig-tails must be opened first or you can get a false
the diode is defective.
reading.
The silicon diodes, CR4 through CR7, can be quickly
checked with an ohmmeter. Disconnect the pig-tail
Check for broken or loose wires using an ohmmeter.
lead and measure the resistance across the diode,
Set the ohmmeter to the lowest resistance scale and
make point-to-point measurements which should
Then reverse the ohmmeter leads and measure the
read zero ohms. Refer to the schematic diagram for
resistance again in the other direction. The two re-
locating common electrical points. (fig. 7-2).
sistance readings should be considerably different.
