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Funai VIP-3000HCMKIII Type Videoplayer Audio Squelch Control

2016-09-10 23:21  
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Funai VIP-3000HCMKIII Type Videoplayer Audio Squelch Control Circuit Working Principle And Repairing Circuit
The Funai VIP-3000HCMKIII type videoplayer audio squelch control circuit is simple, but it has a high fault rate. This arctical intruduces this audio squelch control circuit's working principle and common faults' repairing methdod.Working Principle.This device's audio squelch control circuit is shown in the picture. It is made up of squelch control transistor V4001, VD4001, R16 and system control microprocessor IC01 (A.MUTE) and so on. Its working principle is intruduced here. When inserting a tape and pressing the replay key, the system control microprocessor IC01's pin would output low voltage level. Then the squelch control transistor V4001 is not conducted. The audio magnetic head picks the audio signal from the tape and then output from pin 6 through the IC4001 (BA328)'a pre-equilibrium and amplification.