Subaru 1600 Service Manual page 689

NOTE:
Never use a high tension insulation
tester, such as a meggar as it will
damage the diodes with its high ten-
sion.
Normal conditions of continuity are
shown in the following table.
ELECTRICAL SYSTEM
Fig. 15-81 Inspecting positive diode
Fig. 15-82 Inspecting negative diode
~
Connect (+) terminal of tester and ;
Diode (+) plate Diode (-) plate
Diode (+) terminal
Diode (+) plate
Connect
(-) terminal
Diode (-) plate
of tester and;
Diode ( -) terminal
5) IC Regulator
I) Prepare the following measuring
apparatus:
a. Resistor
IOn 3W (one)
b. Variable resistor
o
to 300n, 3W (one)
c. Battery
12 V (two)
d. DC voltmeter
o
to 30 V, (one)
2)
Connec~
the above-listed apparatus
as shown in Fig. 15-83 "Check cir-
cuit wiring diagram (1)", and perform
checks in the following sequence;
l,
Fig. 15-83 Check circuit wiring
diagram (1)
a. Check V. (voltage of battery 1).
Battery 1 is normal if 10 V to 13 V
is indicated.
-----------
Nonconduction
Nonconduction
Conduction
----------
Conduction
Conduction Nonconduction
----------
b. Check V
2
(voltage between termi-
nals F and E) with terminal S dis-
connected. IC regulator is normal if
the voltage is below 2.0 V. If a volt-
age of 2.0 V or higher is indicated,
the regulator is faulty and should
be replaced.
c. Check V3 (total voltage of batteries
1 and 2). Both batteries are normal
if 20 V to 26 V is measured.
d. Measure V
1
(voltage between termi-
nals F and E) while slowly increas-
ing the resistance of the variable
resistor, starting from O. Check
whether the voltage of V
2
changes
from below 2.0 V to 10 V
-13 V
of
V
3 (that is, the voltage of bat-
tery 1). If no change occurs, the
regulator is faulty and must be re-
placed.
e. Measure
V
4
(voltage between cen-
ter tap of variable resistor and
terminal E). With variable resistor
Rv fixed, check V
4
to see whether
it is
within the specified range. If
V
4
is
in the specified range, the
regulator is normal. If not, the
regulator is faulty and must be
replaced.
Specified voltage
range
15-26
14.5 ±0.3 V
f. Connect measuring apparatus as
shown in Fig. 15-84 ''Check cir-
~uit
wiring diagram (2)", and meas-
ure V
4
(voltage between terminals
B and E). Perform check in the
same manner as in steps d and e
above. If a voltage 0.5
V to 2.0 V
higher than V
4
is measured, the
regulator is normal. In other cases,
replace the regulator.
A9 .... '6
Fig. 15-84 Check circuit wiring
diagram (2)
5. A •• embly
1) Assembling brush and IC regulator
a.
Soldering brush
Set the
brush in
position and solder
the leads.
, I I I ,
,,,
1·1 "'I