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Regulator/rectifier - Kawasaki KZ400 Service Manual

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Table of Contents
218 MAINTENANCE-ELECTRICAL
A. Alternator Leads
Table K4
Stator Coil Resistance (measured when cold)
I
Meter Range
I
MeterReading
I
.Using
the highest resistance range o f the multimeter,
measure the resistance between each o f the yellow
leads and chassis ground. Any meter reading less than
infinity
( 0 0 )
indicates a short, necessitating stator re-
placement.
A. Alternator Lead
Regulator/Rectifier
I f the stator windings have normal resistance, but
the voltage check showed the alternator to be defective,
then the rotor magnets have probably weakened, and
the rotor must be replaced.
RegulatorIRectifier
The regulator and rectifier are solid-state type, and
integrated into one unit. Since i t contains no contacts
or other moving parts, i t does not wear out and never
needs to be adjusted.
I t i s therefore manufactured as
a sealed unit, and must be replaced as a unit should it
become defective.
The rectifier in the unit rectifies
(change to direct current, DC) the alternating current
(AC)
from the alternator.
I t contains four silicon
diodes which are connected i n a bridge circuit arrange-
ment for efficient, full-wave rectification.
The regu-
lator in the unit keeps the battery
(+)
terminal voltage
level to a maximum o f the specified range. The control
circuit i n the diagram checks on the voltage level, and
triggers the thyristors.
Though the actual regulator/rectifier circuit performs
full-wave rectification, a simplified single-phase circuit
of half-wave rectification i s explained here to aid the
technician in troubleshooting and in understanding test
procedures.
Fig. K13 shows the basic circuit o f the
regulator/rectifier.
The
main components o f the
regulator/rectifier circuit are a thyristor (Th), or Silicon
Controlled Rectifier (SCR) as it i s also called, and a
diode. The diode, thyristor (Th), and zener aiode (ZD)
function as follows:
1. Diode
A current o f electrons can flow only from the cathode
to the anode o f the diode. However, a defective diode
will either conduct i n both directions (a short) or not
conduct at all (an open). I f any o f the diodes
i s
shorted
or open, the voltage from the regulator/rectifier will be
below normal, and the battery may not be charged
adequately.
Brown
Rectifier
'
Regulator
Black
I

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