Subaru 1600 Service Manual page 687

2) Cautions for Handling
I) Do not operate the alternator at
high speeds with its output terminal
(BAT terminal) dIsconnected,
Otherwise the diode may
b~
damaged
due to high voltage generated.
2) When reaching the battery by a
quick charge, etc., disconnect the
2. Test
ELECTRICAL SYSTEM
alternator output terminal (BAT ter-
minal) before recharging.
3) When inspecting the circuit
between individual terminals, or when
performing a continuity test of the
diode, do not use a high voltage tester,
such as a megger, as the diode will be
damaged.
Use an ordinary tester.
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Voltmeter
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1
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Note: 1 ... O.25n resistor
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Con~ect
this resistor
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Lam
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Battery if the battery has
AC generator!
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been discharged .
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Fig. 15-70
1. Generator speed at 13.SV
1) Open switch SW
1,
and close
switch SW
2 •
Gradually raise generator
speed, and read the speed when the
voltage is 13.5 V.
2) The generator is normal if it turns
at 900 rpm when the voltage is i3.5 V.
2. Me.asurement of regulating voltage
Open switch SW
1
and close SW
2 •
Turn the generator at 5,000 rpm. The
regulator is normal if the voltage is
within 14.5 ± 0.3 V with a fully charg-
ed battery.
I
3. Measurement of output current
1) With the variable resistor set to
the minimum resistance position, close
switches SW
1
and SW
2
in order to
turn the generator.
2) Raise generator speed while keep-
ing the voltage constant by adjusting
the variable resistor. Measure the cur-
rent at 1,250 rpm, 2,500 rpm and
5,000 rpm.
1,250 rpm
Greater than
~
2.500 rpm Greater than 50 A
L
5,000 rpm
Greater than 55 A
- -
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I I" I .
A9-421
3. Disassembly
1) Remove the through bolts from
the alternator. Detach front cover with
rotor from rear cover with stator by
light tapping on front cover with a
plastic hammer.
2) Hold the rotor with a vise and
remove the pulley nut.
NOTE:
When holding the rotor with the vise,
insert aluminum plates on the contact
surfaces of the vise to prevent the
rotor from damage.
A9-246
Fig. 15-71 Removing pulley
3) Rotor from front cover.
4) Three screws from front cover and
then retainer and ball bearing.
15-24
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5) Separate the stator with diode
assembly and brush assembly from
rear cover by removing the nuts on
rear cover.
6) Disconnect diode assembly, brush
assembly and IC regulator all together
from stator coil lead wires by using
soldering iron.
NOTE:
Melting should be done quickly not
to damage the diodes and IC regulator.
7) Disconnect the diode assembly
from the brush and IC regulator by
removing 3 mm (0.12 in) dia. rivet and
by unsoldering L-terminal.
8) To ieplace the IC regulator, first
unsolder the regulator terminals, and
then remove the two bolts.
NOTE:
Do not remove these bolts except
when replacing the IC regulator.
4. Inspection and
Repair
1) Rotor
1) Inspect the slip rings for contami-
nation or any roughness of the sliding
surface.
Clean or poJish with #500 to #600
emery paper if defective.
A9·250
Fig. 15-72 Correcting roughened slip
ring
2) Broken wire test
Inspect the rotor coil for continu-
ing between the slip rings.
If there is no continuity, it is
broken.
Replace rotor assembly.
Resistance of rotor coil 4 -
5n