Bose Lifestyle 28 Handbuch zur Fehlersuche - Seite 21

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PS18/28/35 Troubleshooting Guide

Theory of Operation

3.3 Clip Detect Circuit

The satellite clip detect circuit consists of diodes D401, D101, D301 and transistors Q3 and Q4

(upper left section of sheet 2). Q4 and Q3 are normally OFF. At high volume levels, if any one of

the satellite amplifier outputs comes within 2 volts of the positive power supply rail, Q4 and Q3

turn ON and signal the DSP board through SAT_CLIP that compression is needed.

Similarly, the bass clip detect circuit consists of transistors Q5 and Q2. Note: this circuit has been

deleted in later production, due to the DSP board making its own determination as to whether a

clip condition exists.