Lexus SC300 / Lexus SC400. Manual - part 284

DESCRIPTION

The alternator is a small, high–rpm, high–performance type with an IC regulator incorporated. The IC regula-

tor uses integrated circuits and controls the voltage produced by the alternator.

PRECAUTIONS

1. 

Check that the battery cables are connected to the correct terminals.

2. 

Disconnect the battery cables when the battery is given a quick charge.

3. 

Do not perform tests with a high voltage insulation resistance tester.

4. 

Never disconnect the battery when the engine is running.

CH–2

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CHARGING SYSTEM

Description, Precautions

DESCRIPTION

The alternator is a small, high–rpm, high–performance type with an IC regulator incorporated. The IC regula-

tor uses integrated circuits and controls the voltage produced by the alternator.

PRECAUTIONS

1. 

Check that the battery cables are connected to the correct terminals.

2. 

Disconnect the battery cables when the battery is given a quick charge.

3. 

Do not perform tests with a high voltage insulation resistance tester.

4. 

Never disconnect the battery when the engine is running.

CH–2

–

CHARGING SYSTEM

Description, Precautions

SYSTEM CIRCUIT

OPERATION

When the ignition switch is turned ON, current from the battery flows from terminal L of the alternator through

the IC regulator to terminal E, causing the discharge warning light to light up.

Then when the engine is started, the voltage output increases as the alternator rpm increases. When the

voltage output becomes greater than the battery voltage, current for recharging flows from terminal B. Simulta-
neously, voltage at terminal L increases and the potential difference between battery and terminal L disappears,
causing the discharge warning light to go off. When the voltage output exceeds the regulator adjustment volt-
age, the transistor inside the IC regulator regulates the voltage so that the voltage from the alternator remains
constant.

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CHARGING SYSTEM

System Circuit, Operation

CH–3

PREPARATION

SST (SPECIAL SERVICE TOOLS)

09285–76010

Injection Pump
Camshaft Bearing
Cone Replacer

Rotor rear bearing

09286–46011

Injection Pump
Spline Shaft Puller

Rectifier end frame

09608–20012

Front Hub & Drive
Pinion Bearing Tool
Set

(09608–00030)

(Replacer)

Rotor front bearing

09820–00021

Alternator Rear
Bearing Puller

09820–00030

Alternator Rear
Bearing Replacer

09820–63010

Alternator Pulley Set
Nut Wrench Set

RECOMMENDED TOOLS

09082–00015

TOYOTA
Electrical Tester

09200–00010

Engine Adjust
Kit

EQUIPMENT

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Part Name

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Note

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Battery specific gravity gauge

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Battery

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Vernier caliper

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Rotor (Slip ring)

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Torque wrench

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CH–4

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CHARGING SYSTEM

Preperation