Diode Checks - Actron CP9087 Service Manual

Section 4
Tests diodes and rectifiers for proper operation.
HIGH
LOW
POWER OFF
RANGE
VOLTS
OHMS
FREQUENCY
FUNCTION
4-4

Diode Checks

1) Set RANGE switch to HIGH.
2) Set FUNCTION switch to OHMS.
3) Connect TEST leads as shown in Figure 1.
( YELLOW to anode — BLACK to cathode)
4) The bottom TEST light should be ON. If a
different TEST light is on or all lights are off, the
diode is defective.
5) Reverse test lead connections as shown in
Figure 2.
( YELLOW to cathode — BLACK to anode)
6) The top TEST light should be ON. If a different
TEST light is on or all lights are off, the diode is
defective.
Note: Always make sure all connections are good. If
necessary, scrape away corrosion, paint, etc. at the
contact points.
Yellow
TEST
Fig. 1
Black Black
Fig. 2
Yellow
TEST