Sovereign L6-4.0L (1991)
Speaker: All Technical Service Bulletins
Radio - Poor Base Speaker Operation or No Sound
SECTION: 86
No: 91
RADIO OPERATION
Model: 1991 MY SEDANS
Date: APRIL, 1991
KEY POINTS:
POOR HEELBOARD BASE SPEAKER OPERATION OR NO SOUND
ISSUE:
Cut or trapped bass speaker wiring resulting in the following conditions:
^
A loud "thump" noise when the radio is switched on or off
^
No radio/tape sound.
^
Poor bass speaker operation.
ACTION:
When diagnosing the above conditions prior to replacing the radio, first check the routing of the heelboard bass speaker wiring.
NOTE:
Replacing the radio before correcting a faulty wiring condition could result in damage to the replacement radio.
If the wiring is trapped between the speaker housing retaining clips (fig. 1) and the steel heelboard panel, the insulation may wear away allowing the wire
to ground.
BEFORE replacing the radio, check both speakers for correct wire routing (fig. 2) using the following procedure:
^
Gently pry the rear bass speaker grill from the speaker housing.
^
Remove the four retaining screws securing the speaker assembly to the housing. Remove the speaker.
