Pioneer SA-6500 II Stereo Amplifier Repair
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- เผยแพร่เมื่อ 5 ต.ค. 2024
- I replaced the 2 output transistors because it was repaired last time with a non-matching pair. I trash picked this amp with a matching receiver. The receiver has a broken power switch so I may or may not repair that unless I can find the right one. I also will be re-capping this in a future video. Even with old caps it sounds really nice. Long video. Hope you like it...
Love the clarity and detail of your vids, it's nice to clearly hear what you're doing and see the actual work being done instead of a blurry out of focus mess.
Just picked one of these amps, but it keeps blowing the 5A fuses. I initially thought it was bad capacitors, but from what I've been reading, it seems more likely the output transistors may be to blame. I've never tried replacing these type before, so this vid is perfect.
Great tip using the pliers to help distance/separate the solder from the other joints, I've never seen that trade secret before. Keep up the great work!
Thank you kindly! Audio gear is my weakness. I love working on this stuff. Make sure you get the service manual(free online) and look over the bias section. I will do a video on setting the bias shortly(within the next week or 2 I hope).
Didn't expect to find a video on fixing my SA6500-ii but here it is. Mine was working well as my garage amp but after accidentally hooking up a turntable with a shorted channel it stopped working. Great video and gives me the confidence to tackle the repair. Not sure if its transistors at fault but step by step I will track it down.
This unit was really bad about blowing output transistors. I have one stored that I would like to repair. It does not like to be run at its full rated output (not even close) and it also does not like difficult loads. As long as you don't rock out too hard, it is ok. A good friend gave this to me after the third failure. It has been packed away a long time, but I do have the service manual. May start to look for output transistors, even if I settle for after market.
I had these fail about five years later. I put oversized transistors in and so far so good. I cant recall the part#s but they were rated 1.5X higher wattage wise. I think the biasing is very touchy. I don't quite understand their method here.
Thanks for this video - I just found one of these myself and was hoping to hook it up to my polk sda 3.1tl’s but the speakers make it clear that I can only use “common ground” amplifiers and I can’t tell whether this one is- can you tell me? Thanks again!
Good job
Great work, I loved it. Thank you
You're very welcome!
nice find.
Hi Frank, I was wondering if you'd gotten around to the recap yet. Looking forward to it!
Hi Paul, not yet but soon. I just did a marantz 1060 that I'm editing so I should have it up this week. The pioneer is on deck though.Thanks for commenting!
@@FixitFrank thank you sir. Best of luck, and I look forward to seeing it all back together. I have one of these, in really pristine shape (my dear grandmother's, original owner, and everything in her life was orderly and pristine) and I may have it recapped, or at least gone over thoroughly.
Great video 🤘
I have a sa 6500 ii also, mine has 2 burnt output transistors. Did you end up recapping this unit ?
I did not actually. I don't hear any hum and I didn't see any in the scope so I figured leave well enough alone. I may do it some day but until it sounds like it needs it or someone else buys it, then maybe it'll be recapped.
I currently have a sa-6500ii that has 2 blown 5a fuses the ones that have red wires that go into the transformer
Most likely all four outputs are bad. You'll want to remove them and then see what the continuity is to ground.
@@FixitFrank hey update , turns out left side d586a has gone bad , I tested all the transistors and it seems like it’s the only one that’s bad , do you know what causes them to go bad? Also where did you get the replacements from? Only ones I could find are from china on eBay
that is where I got them as well. Id make sure the resistors around that transistor are good and within spec. Usually shorted speakers cause this damage but so can bad filter caps and resistors drifting out of value.
Hi Frank, thanks for the excellent vid. I have a SA 6500 II in my garage as well, it was fixed several years ago and in the bag of replaced parts there were 2 NEC npn/pnp and another smaller transistor. It works well but one channel doesn't go to zero volume now. Any idea where to look? Would the bias affect it like this?
Thank you! These are great amps. As far as your volume issue, check the volume pot grounds. That can happen if you lose a ground usually. I know the volume pots can be finicky of they are dirty.
Ideally a scope would be the best way to find the issue but I bet if you check the grounds in the volume and tone section you may find the issue. You may also want to check the biasing. The service manual is free online and goes over the jumpers that you use for bias testing.
@@FixitFrank Thanks Frank! Best regards from Australia
I have the same unit but on mine one speaker doesn’t work any ideas?
I'd start by checking the fuses, if they are open, then check the outputs like I did here. Its a great amp so its worth the effort
Mine is the same and needs a volume pot replaced. Can you send a picture of the volume pot wiring if it is standard? That's all mine needs. Can you help me?
I seem to recall the service manual being available online for free. I do have this amp still but I will have to take the top off. If you can sit tight for a few days, I will see what I can do. If I cant get it to take a pic, I will see if I can find the service manual with the wiring diagram.
Hi Frank, I would very much appreciate your advice. I have a vintage Pioneer SA 1520 stereo amplifier which I bought in 1991 together with a CD Player, a cassette changer/recorder and a pair of two-woofer, two tweeter one midrange speakers. Now I want to add more base sound to my equipment by incorporating a modern sub-woofer. My doubt is whether I can adapt the subwoofer connectors to my amp´s spring clip terminals using banana plug connectors or other type of adaptor? if so, would sound quality be affected in any way? if this works out then I could even contemplate the possiblity of buying a new pair of speakers (ELAC, KLIPSCH, etc) . Thanks for your time
Hi Alonso! There are 2 easy ways to do this. Many subwoofers have High level (speaker level)inputs as well as low level(RCA type). You would wire the subwoofer between each speaker and the amp. The signal would go to the sub via the high level in, and then back out to the speaker. Similar to a Bose Acoustimass of the same era. Your amp also supports low level output after the volume control, On the back there are 2 little jumpers between the 'adapter' ports. You could use two RCA female to dual male adapters to bridge the adapter output/input(replacing the jumpers) and then run a long stereo RCA cable to the subwoofer. I would prefer the second option as it would likely sound better. However, if your L/R main speakers are not far from the amp, then using the high level option would be just as good. The low level option is better if the sub has to be far away physically from the amp or speakers. www.manualscenter.com/manuals/pioneer/sa1520-owner-manual.html page 4 of the manual shows the adapter plugs on the lower right of the back of the amp.
@@FixitFrank Many thanks for your advice. I¨ll try it.
very helpful thanks. I can't understand on my 7500 how to change the light bulb that burned out. could you give me a suggestion please? Gabriele
Is it possible that I could get a list of what capacitors you used if you ended up recapping this?
I don't have a list unfortunately but what I can tell you is that I would recap any power supply capacitor. The signal caps should be fine. Anything located near a heat source would be replaced as well. Those older electrolytics were made better. The larger filter caps on the DC amp supply and any of the low voltage power caps would be changed. No reason to change everything unless you want to.
Frank!!
Big fan and also a guy trying to learn the art...
I just recently got a 5500II and a 8500 in a trade for a ADC EQUALIZER!
the score of a lifetime..
The guy dixnt kbow or seen to care ...he just wanted a eq.
Anyway... The 5500 II is in trouble ..
Here's what I know ..
1. No indicator light ...
2. Fuses all check out
3. A not hearing any relay when turning on.
I have also noticed the capacitor that I believe to be the power supply cap (gray cap nestled next to left and right large cap) looks to have had leaked some at some point.
Havung said that I may be wrong and it could be old dried glue..
Any ideas here?
And what is your stance on those "re cap kits " on ebay... Are they worth a darn?
Just got one of these and the 8800 for free!!
The 5500 wont turn on..
The 8800 foes but no sound.
Any ideas?
5500 - I'd start at the power supply. Check for fuses and that sort of thing. The service manual is available online and has a lot of great info.
8800 - Sounds like an amplifier problem. I'd suggest checking the outputs and the drivers as well as the protection circuit. Both are very nice amps.
Hi Frank, and thanks for this video. I am trying to troubleshoot one of these units, and my question is the continuity tests you do around the 37min mark. You test the screws for continuity to the chassis, and then the back plate of the transistor, but you call it the collector. Is that plate connected to the collector leg?
Correct. It's connected right to the leg.
Thanks for your reply. Further research indicates PNP transistors do this, but NPN. Am I interpreting that correctly?
Collector is middle leg on these NEC transistors. And on PNP, collector/plate goes to ground, so maybe you didn't need to isolate that particular one in the video?
@@jodyj.6110 They both do it. The only difference is that one connects to the negative supply(PNP) and the other connects to the positive (NPN). The collector sees the most current, therefore the most heat. The surface is insulated from the chassis with heat sync paste and mica or some other insulating sheet between the metal surface of the collector and the heatsink.
@@jodyj.6110 There is a piece of mica on the metal. th-cam.com/video/NfxaMnUmPk8/w-d-xo.html I put it on here. The screws are insulated from the metal by the front piece of plastic. Occasionally there are amps with the collector directly on the heatsink but it is not common.
sorry where is the type or model of final amplificateur of 6500 II? thanks a lot
oh boy, I don't remember. they were these older NEC transistors that I had to order from China to get the proper numbers. I'll have to check and get back to you. Ill reply here and add them to the description.
Hi Frank , I have this amp and it turns on ok goes for awhile and then just cuts out. Any idea what would/ could cause the sudden cutoff. Thanks in advance. Cheers Mike in Nova Scotia.
Hi Mike, When it cuts out, will it come right back on, or does it have to sit for a little while? It could be a few things, it's hard to speak specifically due to the many possible causes.
FixitFrank Thanks for replying! It has to sit for a little while. I usually shut it off and wait a little bit ,then back on again. Round and round we go. Seems as if something is getting hot and cutting out. I know this is impossible for you to diagnose. Just thought there might be a common problem particular to this amp that was known. Appreciate your channel great content.
@@miker5502 No problem at all! I actually have a suspect area. I'd make sure you don't have a speaker wire that might be touching or more likely the protection circuit is kicking in and turning off power to the output transistors. These have a neat protection circuit without relays. It's not as reliable as a relay activated circuit but its neat. If you get motivated, check for leaking power supply caps. Its possible one or more is heating up and throwing the bias off to the amp transistors which is invoking the protection circuit. The service manual is free to download and has a lot of good info on checking the bias, after replacing the caps(if that's what it is). The other likely cause is a transistor breaking down. That's a little harder to diagnose. It's a great amp. Hello back from Pennsylvania!
FixitFrank Thanks Frank, will check these out. Stay Safe in Pennsylvania! Cheers Mike.
Can you help my resistor is burned and the value cant see can you help me to see the resistor value
Which one?
Hi Frank
we have a problem with our sa6500 II .
we changed four powertransitor(Q17.18.19.20) they were out.
So after ,we verified all the differents voltages with the service manual.
all voltages are good ,only one is very strange ...
pin 5 on the two TA7136p1 ( q1 and q2) we mesure -19v instead of +17v
all other pin are ok ,r7 and r8 are ok
do you think the twice preampli are out ?
can you help us please
thanks
BUBU & MAT ( french GUYs...)
Hi
I add,thank a lot for your tuto.
Bubu mat
hello, I suspect you have a bad resistor somewhere in the power supply. Start tracing the voltage back and I suspect you find the bad part. I will check the manual tonight and see if I can locate a possible resistor that would cause this. Thanks for watching my video!
FixitFrank.
Hi
I verified all supply voltage.
Tp7136p1 has goods vcc- and vcc+.
The pin5 is not ok. -19v instead of +17v
The voltage is bad because the aop is ko? You think?
Or do I must apply a audio signal in the tp71... ?
Thanks a lot.
What do you read if you remove the IC? I found the service manual and pin 4 -19, pin5 +19, Pin6 0v, Pin7 +21v. The +19 is derived from the 21v via a resistor. Make sure that R8 is 47K. If it is, then I suspect the IC is bad. If you need the service manual, let me know.
FixitFrank thanks for your answer.
I remove the ic channel A. I read -19v on pin 5 ic channel B.
2nd test,I remove ic channel B,I read -19v on pin 5 ic channel À.
3rd test, I remove twice ic A and B,
I read 19/20 V on pin 5.
The R8 and R 7 are goods.47 K.
I think twice Ic are out.
What do you think?
Thanks again
Hai my name is kadek i got sa 6500 but i got problem i lose my ic , can you help me to tell me the code nomer ic i should find?
Hi Kadek, What IC did you lose?
How easy is it to fix the power lamp indicator?
I don't think it should be very difficult. The service manual is available online for free to show you how it is assembled. I haven't had to do it yet.
@@FixitFrank thank you for your time Frank . I really appreciate sincerely Tim
@@timbabyfacesavage377 Sure thing. I actually have another one that I am working on. I'm waiting for the outputs to arrive but I will look at the bulb mount tomorrow and if there is anything I can put on video to show you, I will.
@@FixitFrank that would be really cool of you . I just bought the tx-6500ii off eBay and now I found the sa-6500ii amplifier with lamp blown out. Hopefully that's all that's wrong with it. Thank you again for everything.
How can i get the power transistor also my pioneer s6500 ll is no sound
I bought mine via eBay from China. I went with original NEC parts. Make sure the driver transistors are also functional.
@@FixitFrank how much you buy the transistor?
@@FixitFrank is it compatible i use other transistor for my SA 6500 II
I think it was less than $20 for the pair of the originals. You can use substitutes. The transistors I removed were substitutes and probably worked ok. You will need to check the bias afterwards. The service manual is easy to find on Google. The service manual shows the steps for setting bias.
@@FixitFrank what transistor you use for substitutes?
Is this 30 wpc or 100?
The spec sheet says 25W per, but 30 is what I am saw in the circuit design. I suspect 25 is where they get the low THD but it will run at 30 no problem.
And now it's for sale in ebay
Really?