Pioneer A-P510 Amplifier

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

As far as testing caps, there is no reliable way without a tester and it should be pulled from the circuit. Again, this is not the only way to attack the problem or something for the average user & best not to get involved if you are not equipped.

Guest · Posted: Mon Oct 20, 2008 3:52 pm Post subject:

ok... thanks for all your help! much appreciated..

this amp is part of a separates system - but it all contects using non standard ribbon cables. it was given to me free... but if i can't get the amp to work it's all going in the bin. i'm not too bothered therefore if my messing with it results in it being irreperably damaged. I don't think it's worth paying for a professional repair - as similar systems can be picked up 2nd hand off ebay for probably less than the repair cost.

was mainly interested in trying to learn a bit more about repair etc.. and if i get it working that's a bonus. i'm fairly skilled at soldering.. so not a problem to de-solder the caps and put them back. they have capacitance meters on ebay for around US$20.00 - are these worth the money in your opinion? or are they just chinese junk? i know you don't have much to go on.. but you think old / dried up capacitors is the most likely problem? have seen ways of testing caps using a multimeter.. but not sure how accurate this would be.

thanks again

phil

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

Not to sound discouraging but, the cheap cap testers are not going to help. While it may be a cap, it is still a guess. It is likely a simple device causing the problem but Without any circuit information, it would be like working with blinders on.

Depending on the type/design, there are certain voltage measurements that can be used to help pinpoint the problem. At least if there was some sort of circuit diagram, I could give you certain points to check.---way too many variables; There could also be a problem in any of these; Rails? drivers? biasing? coupling etc.

Guest · Posted: Wed Oct 22, 2008 2:56 pm Post subject:

ok... it's really hard to discourage me Very Happy

i have some basic electronics knowledge and some test equipment. i've managed to get hold of a service manual for this now so going to have a good look through and see if i can understand any of it... i'm more interested in learning as opposed to actually getting this working, but if i can get it working too that's a bonus.

thanks again for the help so far..

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

OK,

It would be a lot better to pick out a name, use it to register & login for further postings and picture posting if you had to.
Since you mentioned that using headphone is ok, you will need to concentrate
on final amp stage & power supply. Do a basic DC reading & compare to what is printed on schematic on various points in final stage (with/volume set to zero).

philpeel · Joined: 15 Oct 2008 Posts: 2

vtech... i registered in this name. just didn't have password with me at work.

i'll have a look at it when i can and i'm sure i'll be back with more questions Very Happy

btw.. i got a broken lcd tv at home.. so i'll be here for a while yet Wink

thanks

Phil