Checking Stator; Checking Diodes - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
C452 C452
OHMMETER
OHMMETER
OHMMETER
Figure 11-7.
Checking Stator Figure 11-8.
Checking Diodes
CAUTION
Do not use 110-volt test lamps to check diodes.
With the stator disconnected,
connect the test lamp leads across each diode
as previously described first in one direction and then in the other. If the lamp
lights in both checks,
or fails to light in both checks, the diode is defective.
When checking a good diode, the lamp will light in only one of the two checks.
Special Tester Method:
Special testers are available which operate without
disconnecting the stator. To use these testers,
follow the tester manufacturer's
reco mmendations.
11-13.
DIODE REPLACEMENT. To replace a diode, use a suitable tool to sup-
port the end frame or heat sink, and use an arbor press or vise to push the diode
out. Also use a special tool which fits over the outer diode edge to push the diode
in, and support the heat sink and end frame with a suitable tool.
NOTE
Diode replacement tools are available
from various
manufacturers normally supplying tools andtest equip-
ment to the aviation industry.
Reissued: 10/12/79 ELECTRICAL SYSTEM
Effectivity
DELCO
4B4