Isuzu NHR 4J Series, Workshop Manual

Page: 358 / 406

CHARGING SYSTEM 6D3 – 13
IC REGULATOR
Measuring instruments is necessary.
Take the following measurements with the instruments
connected as shown in the illustration.
V1 Voltage at BAT1 V
Standard 10 - 13
V2 Voltage across F-E V
Standard Limit
2 or less 2 or more
Take measurement with `S' terminal disconnected.
V3 Measure the voltage at BAT1 - BAT2.
V
Standard 20 - 26
• Measurement the voltage across the E-F while varying
resistance gradually from zero using variable resistor.
Then check that voltage increases from 2V to 10 - 13.
If increase in voltage is interrupted at any point,
replace the regulator.
• V4 Measure the voltage across the intermediate tap on
variable resistor and `E' terminal without actuating the
variable resistor.
V
Standard voltage at 20°C (68°F) 14.0 - 14.9
If measured value deviates from the standard, replace
the regulator.
Check the following with the instrument connected as
illustrated.
Measure the voltage across the terminals B and E by
gradually increasing voltage with variable resistor RV.
Check to see if voltage increases from lower than 2V to
range from 10 to 13 volts.
If the voltage does not vary, the regulator is defective and
should be replaced.
Check the voltage across the intermediate tap of the
variable resistor and terminal E without actuating the
variable resistor.
V
Standard voltage at 20°C (68°F) 14.5 - 16.9
If measured voltage deviates from the standard value,
replace the regulator.
6D3-13-1.tif
6D3-13-2.tif