Question about Technics Audio Players & Recorders
I have an Technics su-g91 amplifier that works well except the volume fluctuates intermittently. Any idea why? Thanks.
Check to see if there is a lot of dust built up in the machine if so remove case and clean with air dust
Posted on Feb 06, 2010
Usually volume fluxuations are caused by a dirty wiper contact on the volume control dial.
Here is what you can do to possibly correct the problem yourself.
1. Grasp the volume control knob and rapidly rotate it back and forth from O colume to about 40 percent volume. Do this for about 30 seconds. (fan it like you mean it) Gently push on the know for a few strokesnand then gently pull on the knob for a few strokes.
2. Rotate the knob to roughly the 40 percent volume position and fan it from 40 to about 80 percent volume repeating step one for around 30 seconds while gently pushing and pulling on the volume control knob.
3. Rotate the volume control knob to around the 75 pecent volume level and repeat above for about 30 seconds while gently pulling and pushing on the volume control knob
4. Select speakers on and off with power off several times GENTLY but for about 20 seconds.
5. Perfrom the same procedure as in step 1 with the balance control.
6. This is probably not the problem but recheck the mating of the speaker wires on the speakers and the amp.
Again volume fluxuations are caused mostly from dirty contacts. My bet is you hear lots of scratchy sounds when you rotate the volume control with the speakers on. (dead giveaway your volume control wipier arm contact is dirty)
This should make a noticeable difference.
Thanks for using Fixya! Kelly
Posted on Feb 07, 2010
Does it happen when you turn the volume control or just when playing? If it happens when you adjust the volume I would say the encoder or potentiometer is going bad. You can tell if it is an encoder by the fact that you can turn the volume knob inifinitley. If it were a poteniometer it would have a mechanical stop. If it happens while playing I would say there is a potenital cold solder joint somewhere in the amplifier stages. Does this have a built in tuner? If so does it happen while listening with the tuner or just an external input source. If it showed symptoms with one and not the other you could assume the power amplifier is good and that the preamp or buffer amps for that particular source could have a problem. Let me know..
Posted on Feb 01, 2010
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Posted on Jan 02, 2017
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