Dear all,
On my Sansui AU-317 (mk I) the mic input is not working properly. I hope you experts can help me to understand the wiring in order replace the jack chassis part. I my attempts so far I got an oscillation sound, so I probably misinterpret the schematic diagram of mic amp circuit board F-2756 and its connection to control amp board F-2752.
Initial problem: very thin sound (with lack of earthing noise) on the mic input, but when I extremely move the mic cable plug in a certain position I get better sound. I removed the jack chassis and tried to clean it, but it fails. I think there is a mechanical cause, so I want to replace the chassis, preferably with XLR.
I'm testing with a balanced mic (stereo jack), I'm not sure if the +/-/GND pin-out matches the AU-317.
I'm refering to the schematic diagram, can you pls help me to understand or advice
1. which of the chassis jack plug contacts is the ring and which the tip, the drawn position of the contacts is confusing, I would assume the tip is the plug contact without the switch;
2. the electrical meaning of connections M (ground?), P (+V?), g (signal ground?) and f (signal?);
3. the function of the switch, does it connect f to ground without jack plug inserted?
4. which of the contacts would correspond to the balanced mic pins +/-/GND?
5. a way to replace the jack chassis with a XLR plug which has no switch function?
Your help is much appreciated!
On my Sansui AU-317 (mk I) the mic input is not working properly. I hope you experts can help me to understand the wiring in order replace the jack chassis part. I my attempts so far I got an oscillation sound, so I probably misinterpret the schematic diagram of mic amp circuit board F-2756 and its connection to control amp board F-2752.
Initial problem: very thin sound (with lack of earthing noise) on the mic input, but when I extremely move the mic cable plug in a certain position I get better sound. I removed the jack chassis and tried to clean it, but it fails. I think there is a mechanical cause, so I want to replace the chassis, preferably with XLR.
I'm testing with a balanced mic (stereo jack), I'm not sure if the +/-/GND pin-out matches the AU-317.
I'm refering to the schematic diagram, can you pls help me to understand or advice
1. which of the chassis jack plug contacts is the ring and which the tip, the drawn position of the contacts is confusing, I would assume the tip is the plug contact without the switch;
2. the electrical meaning of connections M (ground?), P (+V?), g (signal ground?) and f (signal?);
3. the function of the switch, does it connect f to ground without jack plug inserted?
4. which of the contacts would correspond to the balanced mic pins +/-/GND?
5. a way to replace the jack chassis with a XLR plug which has no switch function?
Your help is much appreciated!