Page 418 - Workshop Manual - Aumark (BJ1051)
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Diagnosis-audio system
3. Comparing with models of the same kind
(a) Set “BAS”, “TRE”, and “BAL” of audio unit to the same level.
(b) Compare with models of the same kind. Check speakers for uniform tone quality.
Yes > End of check
No > Replace CD or MP3 audio unit.
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