Radio - Noise/Reception Diagnostic/Repair Procedure: Overview

9235ford01

Article No.
92-13-6

06/17/92



RADIO - NOISE/RECEPTION CONCERNS - COMPREHENSIVE DIAGNOSTIC AND REPAIR PROCEDURE


LINCOLN-MERCURY:
1985-91 MARK VII
1989-91 CONTINENTAL
1990-91 TOWN CAR


ISSUE:
A comprehensive radio noise/reception diagnostic and repair procedure has been developed for service use. Many sound system concerns can be diagnosed and resolved by using this procedure.

ACTION:
If service is required, use the following diagnostic and repair procedure to resolve the radio noise/reception concern.


VERIFICATION

Before performing audio sound system diagnosis, verify the customer's concern. If the customer has a concern about a particular station or stations, be sure to test the radio at those stations. Keep in mind that the noise concern may be heard at one area of the radio band.

CONTENTS

This TSB article includes the following diagnostic and repair topics:

A. AM Signal Issue - Diagnostic Tips

B. FM Signal Issue - Diagnostic Tips

C. Diagnosing AM Band Alternator Whine

D. Diagnosing AM Band Ignition Noise

E. Lincoln Town Car

1. AM Static - Weak Station

F. AM Station Fade - Interference

1. Ignition Noise

2. Windshield Wiper "Pop"

3. Windshield Wiper (Electric Motor Static)

4. Brake "Pop"


5. Heated Windshield

6. Windshield Washer Motor Noise

7. Turn Signal

G. Noise In Tape Mode

H. Lincoln Continental

1. Excessive AM static

2. Poor AM Reception

a. Ride Control

b. Anti-Theft

I. Poor FM Reception

1. Fuel Pump Motor

2. JBL Amplifier

3. Heated Windshield

J. Lincoln Mark VII

1. AM Static

a. Ignition Noise

b. Charging System

c. Fuel Pump Motor

d. Brake "Pop"

e. Horn "Pop"

K. Poor AM Reception

1. Ignition System AM Interference

2. Charging System AM Interference

3. Fuel Pump Motor AM Interference

4. Brake "Pop"

5. Horn "Pop"