Hello Folks,
I have a Technics SU-V65A HiFi amplifier which has been working until a few months. I have not been using it for a while now and when I tried to hook it up again it wouldn't work anymore. There are two status bars on the front panel, one is named "Voltage Control" , the other one is called "Current Drive". When the amp is ready to operate both of these bars should be illuminated but in my case there is just the "Voltage Control" illuminated, the "Current Drive" stays switched off. I read that this is probably caused by the protection circuitry of the Chip. So it seems like the amp gets power and everything works but the protection circuit engages and prevents the main power amp chip from working. I wasn't able to upload a full handbook but I found this link, where the protection circuitry is firmly described: TECHNICS SUV65A - Service Manual Immediate Download
Now I'm wondering what I could do to find the error and probably solve it. I attached some photographs. On the pictures you can see the part with the protection circuitry for example (labelled on the PCB).
If somebody could point me towards some ideas about what I could try, I would be very happy. I have experience with mainly guitar effects pedals and some tube-related projects, so I think I know what I'm doing, but I'm not yet familiar with HiFi-electronics.
As the amp has been working fine until a few months ago I don't think there is a big issue with it, I just don't know where to start and what to try.
Thanks a lot!
And yea, it really is quite dusty inside, I should take a vaccuum and a cloth and clean it.
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4591_zpsri2ubcwv.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4592_zps2eulycjs.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4593_zps2lrjo4tq.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4595_zps3fz4zcuy.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4599_zpsazbraces.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4600_zpszky0tevj.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4601_zpsguzmwpmh.jpg[/IMGDEAD]
I have a Technics SU-V65A HiFi amplifier which has been working until a few months. I have not been using it for a while now and when I tried to hook it up again it wouldn't work anymore. There are two status bars on the front panel, one is named "Voltage Control" , the other one is called "Current Drive". When the amp is ready to operate both of these bars should be illuminated but in my case there is just the "Voltage Control" illuminated, the "Current Drive" stays switched off. I read that this is probably caused by the protection circuitry of the Chip. So it seems like the amp gets power and everything works but the protection circuit engages and prevents the main power amp chip from working. I wasn't able to upload a full handbook but I found this link, where the protection circuitry is firmly described: TECHNICS SUV65A - Service Manual Immediate Download
Now I'm wondering what I could do to find the error and probably solve it. I attached some photographs. On the pictures you can see the part with the protection circuitry for example (labelled on the PCB).
If somebody could point me towards some ideas about what I could try, I would be very happy. I have experience with mainly guitar effects pedals and some tube-related projects, so I think I know what I'm doing, but I'm not yet familiar with HiFi-electronics.
As the amp has been working fine until a few months ago I don't think there is a big issue with it, I just don't know where to start and what to try.
Thanks a lot!
And yea, it really is quite dusty inside, I should take a vaccuum and a cloth and clean it.
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4591_zpsri2ubcwv.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4592_zps2eulycjs.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4593_zps2lrjo4tq.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4595_zps3fz4zcuy.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4599_zpsazbraces.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4600_zpszky0tevj.jpg[/IMGDEAD]
[IMGDEAD]https://i924.photobucket.com/albums/ad88/iefes/DSCN4601_zpsguzmwpmh.jpg[/IMGDEAD]