SkyTrak 6036 Service Manual - Manual (Page 220)

Section 10. Electrical System
10-26 Model 6036 S/N 9B0499 and Before
Fig. 10.31 Diode Trio Check
f. Diode Trio Check
1. The diode trio is identified in Fig. 10.31. To
check the diode trio, remove it from the end
frame assembly by detaching the three nuts,
the attaching screw, and removing the stator
assembly. Note that the insulating washer on
the screw is assembled over the top of the
diode trio connector.
2. Connect an ohmmeter having a 1-1/2-V cell,
and using the lowest range scale, to the single
connector and to one of the three connectors.
Observe the reading. Then reverse the ohm-
meter leads to the same two connectors. If
both readings are the same, replace the diode
trio. A good diode trio will give one high and
one low reading.
Fig. 10.32 Rectifier Bridge Check
3. Repeat the same test between the single
connector and each of the other two connec-
tors. Also, connect the ohmmeter to each pair
of the three connectors (not illustrated). If any
reading is zero on this test, replace the diode
trio.
g. Rectifier Bridge Check
1. To check the rectifier bridge, connect the
ohmmeter to the grounded heat sink and one of
the three terminals as shown in Fig. 10.32.
Then reverse the lead connections to the
grounded heat sink and same terminal. If both
readings are the same, replace the rectifier
bridge. A good rectifier bridge will give one
high and one low reading.
2. Repeat this test between the grounded heat
sink and the other two terminals, and between
the insulated heat sink and each of the three
terminals. This makes a total of six checks,
with two readings taken for each check.
3. To replace the rectifier bridge, remove the
attaching screws, and disconnect the capacitor
lead. Note the capacitor lead clip is attached
with a screw or press fit.
Fig. 10.33 Checking Stator Windings
h. Stator Checks
1. The stator windings may be checked with a
110 V test lamp or an ohmmeter, refer to Fig.
10.33. If the lamp lights, or if the meter reading
is low when connected from any stator lead to
the frame, the windings are grounded. If the
lamp fails to light, or if the meter reading is high
when successively connected between each
pair of stator leads, the windings are open.
DIODE TRIO
OHMMETER
OHMMETER
(CHECK FOR OPENS)
MA1141
MA1151
MA1161
OHMMETER
(CHECK FOR OPENS)
OHMMETER
(CHECK FOR GROUNDS)