SC 300 L6-3.0L (2JZ-GE) (1992)
Radio/Stereo: All Technical Service Bulletins
Radio - Static Noise On Weak AM Stations
ELECTRICAL
EL95-006
NOVEMBER 30, 1995
SC 400/300
Title: '92-'94 SC 400/300 STATIC NOISE ON WEAK AM STATIONS
Rheostat (dimmer switch) and other electrical noise may be heard when listening to weak AM stations on a '92-'94 SC 400/300 with either Nakamichi or
Pioneer systems. This noise will change in intensity with different electrical loads (turn signal, headlights, rear defogger and A/C).
Improper grounding of the antenna, antenna cable and/or radio chassis can cause this condition.
Do not exchange the radio. Use the following repair procedure:
REPAIR PROCEDURE:
1)
Play the radio on a strong AM station and slowly move the tip of the antenna mast forward and back approximately 2 inches. If static noise is not
heard, go to Step 2. If static noise is heard during antenna movement, replace the antenna mast and go to Step 3.
NOTE:
Do not touch the antenna mast with your bare hands. Use a glove or non-metallic object to move the antenna. (If you touch the antenna with your
hands, you will change the antenna sensitivity).
2)
Remove the antenna mast and inspect the base of the mast for corrosion and damage. Clean with 1500 grit sandpaper.
3)
Remove the antenna assembly and inspect the inner fender around the antenna hole for corrosion. Clean with 1500 grit sandpaper.