New Holland T8010 Manual page 1326

Audio System Circuit Operation
The audio system is a four speaker AM/FM stereo with cassette. The audio system is energized by switched power.
The audio system display is linked to the instrument panel light so that it dims when the instrument panel lights are
dimmed.
Audio System Circuit Troubleshooting
Before troubleshooting the Audio system make sure that the following operating conditions are met:
A. The batteries are fully charged and all connections are clean and tight.
B. Transmission in neutral or park.
C. Check all connectors for full installation, loose, corroded, pushed out, or bent terminals.
D. Check fuses #19, 24
E. Refer to NAO Electrical Schematic 87389710, schematic sections 62 & 63.
Audio System Symptom Chart
NOTE: The batteries must be fully charged and all connections clean and tight. Use a multimeter (DVOM) for these
tests. For battery testing and service, see the battery section in the service manual.
IMPORTANT: DO NOT use a self-powered test light for any of these tests. Use of a self-powered test light can
cause damage to components in this system.
WARNING: Before performing any of the electrical tests, be sure all operating controls are in neutral or
!
park lock position. This will eliminate accidental movement of the machine or start-up of power driven
equipment.
Symptom
Audio unit is inoperative
Blank display, radio/tape
player operates
Audio operates, tape player
does not operate
Audio unit illumination
inoperative
Noisy reception
Section 55 - Electrical System - Chapter 1
AUDIO SYSTEM
Possible Cause
Fuse/Power Supply
Audio Unit
Audio unit
Audio unit
Illumination circuit
Audio unit
Antenna
Audio Unit
55-1-145
Reference/Test
A - Audio System Power and
Ground Supply Test
If A - Audio System Power and
Ground Supply Test results are
good, Audio unit is bad.
F - Audio System Illumination
Test
If F - Audio System Illumination
Test results are good, Audio
unit is bad.
G - Antenna Test
If G - Antenna Test is good,
audio unit is bad.