Figure 4-68. Relay circuit (ModelMEP-O18A).
Testing (Model MEP-023A). All testing is
done with all external leads
disconnected from relay panel
terminals. Use a multimeter set
at appropriate range and measure
resistance. Apply test probes to
relay panel terminal as indicated
below and obtain results as
Resistors. Test from terminal.
13 to 14-4320 ohms-tests R8
13 to 15-9090 ohms-tests R7
13 to 1 I-17.4 ohms-tests R10
13 to 12-7680 ohms-tests R9
16 to 7-270 ohms-(with field flash switch in FLASH-tests).
R5. Open circuit indicated with switch in OFF position. 17 to
field 5-270 ohms (with flash in FLASH-
Open circuit indicated with switch
in OFF position.
A true test is possible only with specialized test equipment
but a functional test can be made
with a multimeter.
Test of the rectifier can be made by taking a reading
between terminals 1 and 6.
Reverse the test probes and take
a second reading. One reading
will be extremely high or infinite
indicate some passage of current
or a readable resistance.
Change 8 4-79