P22a low output
I want to thank as_audio for the P22a schematics. The fault was the same as post 31 and post 39, bad coupling capacitors in one of the speakers. I ended replacing almost all electrolytic capacitors in both speakers just to extend usefulness.
I want to thank as_audio for the P22a schematics. The fault was the same as post 31 and post 39, bad coupling capacitors in one of the speakers. I ended replacing almost all electrolytic capacitors in both speakers just to extend usefulness.
P11a bad transformer
Hello everyone and many thanks to as audio for the p11a schematic.
I had a p11a with a bad transformer. It's being a while since I checked it but if I remember correctly it had an open primary. I tried to find the thermal fuse but had no luck with that. I then got a replacement transformer, just installed it but there is still no output.
All the voltages seem to be correct: + - 38.8 on the ps capacitors, + - 22 on the preamp ps and +- 15 on the 7815 7819.
The preamp seems to be working correctly, as I have signal up to the coupling capacitors c97 c98 at the input of the ucd module. I also replaced all the 22uf 63v capacitors. It seems like the ucd module is gone or the protection is on. On pin 5 of the ucd I get 38.5v and on the output pins 7 and 8 -23.7v and on the protect output at T22 I have 13.4v
Any ideas? Maybe someone knows what are the correct voltages for the protection circuit?
Thanks in advance
Hello everyone and many thanks to as audio for the p11a schematic.
I had a p11a with a bad transformer. It's being a while since I checked it but if I remember correctly it had an open primary. I tried to find the thermal fuse but had no luck with that. I then got a replacement transformer, just installed it but there is still no output.
All the voltages seem to be correct: + - 38.8 on the ps capacitors, + - 22 on the preamp ps and +- 15 on the 7815 7819.
The preamp seems to be working correctly, as I have signal up to the coupling capacitors c97 c98 at the input of the ucd module. I also replaced all the 22uf 63v capacitors. It seems like the ucd module is gone or the protection is on. On pin 5 of the ucd I get 38.5v and on the output pins 7 and 8 -23.7v and on the protect output at T22 I have 13.4v
Any ideas? Maybe someone knows what are the correct voltages for the protection circuit?
Thanks in advance
Hello,
I need a toroidal transformer replacement for Adam P22 Active Studio Monitor.
Adam don't have them in stock anymore.
Or maybe someone who can repair this one?
I need a toroidal transformer replacement for Adam P22 Active Studio Monitor.
Adam don't have them in stock anymore.
Or maybe someone who can repair this one?
Depending on your location rewinding should be possible (with removal or replacement
of the thermal fuse). See transformer mounting precautions elsewhere in this thread.
of the thermal fuse). See transformer mounting precautions elsewhere in this thread.
Try here:
http://www.askjanfirst.com/eindex.htmsearch for : Custom made toroid transformers
Used their services a few times.
Great job.
http://www.askjanfirst.com/eindex.htmsearch for : Custom made toroid transformers
Used their services a few times.
Great job.
Hey, man. I searched the internet and didn't find a single schematics. I need a schematics for Adam a5x. My schematics say me "I'll be back". I hope)))
I didn't find private messages, sorry
Attachments
A5X is of current production, so they will only give factory support.
Show the other side of the board.
Show the other side of the board.
The cap may be of bad production. Leave it away, it is not required.
Add some foil if you insist. Remove any carbon with rotating grinder.
Add some foil if you insist. Remove any carbon with rotating grinder.
So… Thank you for your advice. The schematic works without a burnt-out condenser… but I soldered it ))
I have a second problem. This monitor plays very quietly. I have a question - why? I changed ALL the electrolytic condensers… And nothing happened. He's still playing quietly!
Help me pls!
Attachments
Full pictures required. Never recap a working amp.
Soldering may not be adequate, see for instance to the left of C265.
Soldering may not be adequate, see for instance to the left of C265.
The fact is that the monitor was working quietly before the condenser (С289) burned out. That's why I replaced all the electrolytic condensers. I don't want to change TDM 8920 BTH (working amp)... but maybe that's the problem! What exactly amplifies the sound? (с265 in order)