BE/Body Electrical Systems — 3 Radio Noise Present But Am–fm Not Operating, page 90

BE–90
BODY ELECTRICAL SYSTEM – AUDIO SYSTEM

3 Radio NOISE PRESENT BUT AM–FM NOT OPERATING

W : w/ Power Amplifier
WO : w/o Power Amplifier

Is power for the antenna being output from
the radio assembly?

No → Radio assembly faulty.

Yes

WO                    W
                Is power for the antenna being output
                from the power amplifier?

                                                No → Power amplifier faulty.
                Yes

Go to No. 32

            If radio side faulty

W                         WO
                    Radio assembly faulty.

Is tape player operating normally?

Yes → Radio assembly faulty.

No

Hissing sound from speaker?

No → Power amplifier faulty.  Recheck system after repair.

Yes

Radio assembly faulty.  Recheck system after repair.