Older component system plays music/cd fine but after a few minutes of normal volume, it turns to extremely loud static that cannot be controlled with volume knob. Cooling fan comes on when volume is turned up, any ideas?
If you say the problem is there, even if the volume control is turned all way down, that means the problem exists in the main amp(the amp that drives the speakers directly). It is not in the preamp or earlier stages.
The noise you're hearing is probably DC Offset(a damaged amplifier) and it can be in one or all the speakers. If you'd like to inquire about having your Technics repaired, please visit my website at audioserviceclinic.com. By the way, I was a factory service center for Technics and Panasonic for some 30 years. Thank you.
Hi Aawpharmd,
system control error.
please go for repair shop.
regards,
nuwan
repair shop said the cooling fan was probably the culprit but when I turn the volume up, the fan comes on, so the repair shop says to quit being cheap and upgrade to a new system
Oh, that's nice! That's what happens when you go to repair shops that know absolutely nothing about audio. Shops that are capable of repairing audio, are getting fewer and fewer every day.
×
SOURCE: Technics SU-V98 No Sound
If I understand your posting correctly, the amp works using the Aux In connectors but not using the VCR1 even when VCR1 is selected correct? If that is the case, there is an internal electronic switching IC (TA9263 I think) that may be defective. This is not a complex repair and can be confirmed easily by any shop that does audio repair. They will trace the incoming signal with an oscilloscope to the IC and see nothing come out when VCR1 is selected. The IC costs less than $10.
Dan
SOURCE: Technics SU-V460 Amp Problems
Problem with older equipment is that mechanical switches corrode. Try some tuner cleaner on switches. One side cutting out may require the speaker leads (inside the cone of speaker) to be re tinned. Old speakers and lossa mileage cause solder to break up into powder. Re tinning the flexible link (looks much like a wick) allows that electricity to get into the speaker coil. If all else fails those old TV repair shops actually do have real techs that can fix it. Not like the current Geek Squad type of replace replace reboot replace type of tech. Good luck. Ed
SOURCE: Technics SU-G75
I had the same problem. The solution to me was presoldering transistor Q708. http://www.flickr.com/photos/37147023@N03/3511227679/?edited=1
489 views
Usually answered in minutes!
Your power supply capacitors are failing.
×