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sx-650

  1. J

    SX-650 recap questions

    I started a recap job on an SX-650 given to me by my big brother a year ago. It is the version that has IC's in the phono section. The cabinet is in rough shape, but the faceplate is clean and it has all the knobs. This receiver has been worked on before. The power switch had been bypassed...
  2. J

    SX-650 Main Supply Capacitors

    Hi. I have a question about recapping a SX-650. I removed the two main supply caps but didn’t realize that the black wire is to ground on one and to positive on the other. Would someone happen to remember: do the orange wires go to neg or pos on the left capacitor? And do the brown wires go to...
  3. lawt0n

    New here, looking for repair help in the Boston area

    Hello! I learned about AK from a nice dude I met from selling a subwoofer on FB marketplace and he recommended that I come here to look for guidance on repairing my Pioneer SX-650. The right channel is static-y and quiet, which, from my internet sleuthing, seems to be a relatively common...
  4. bzenic

    SX-650: Upgrade heatsinks on Amp2 D313?

    Although everything works on my SX-650 I noticed that two D313 on Amp2 board are running very hot. I'm curious if anybody tried to replace their original with bigger or better heat sinks? Additional problem is that there is no too much space around for expansion. It would be nice to make those...
  5. bzenic

    Pioneer SX-650, Zero Voltage at Power Amp pin 31

    The FM and AUX / mic inputs work. On the flip side somebody was messing with bulbs and the connecting wires, power light also doesn't work. According to the service manual on the power amp board I should get the following measurements: 30 V at pin 30, , 7.5 V at pin 31 (this is used to feed...
  6. Timothy Flath

    Pioneer SX-650 Restoration Project

    A while back my lovely wife found a nice little toy at a local thrift shop so I got her to bring it home (love that she gives me a call when she sees something nice). Was really needing a nice little project to keep me occupied with Omicron raging out there these days. Ordered a Deluxe...
  7. 4ever7

    SX-750 RCA ports interchangeable with SX-650?

    Hello everyone Planning a restoration of a pioneer sx-750 and trying to find out if the RCA ports on an sx-650 will fit on an sx-750? My initial guess is yes but wanted to see if anyone has done this or definitely knows Any help is appreciated
  8. 4ever7

    one channel cuts out at low volumes on a SX-650

    Hello Everyone I have a pioneer sx-650 which does not have audio in one channel at low volumes (background music levels). Needless to say, as I raise the volume the channel kicks in, the problem becomes I can't listen to higher levels all the time. Has anyone come across this? Is this expected...
  9. cudajim

    Pioneer SX-650 won't fire up.

    I'm trying to fix an old Pioneer 650 amp. It's on my test bench and it crapped out just yesterday. The output relay won't engage. I get audio signal all the way to the relay and if I jump it I get good sound, both channels. The relay itself picks with an external supply. I suspect the...
  10. mstewart

    Pioneer SX-650 EQ Board AWK-065 Location

    I'm almost finished recapping a SX-650 and can't seem to figure out where this board is hiding. Anyone know where it is?
  11. Gotaj

    SX-650 woes (left channel distortion when connecting speakers)

    Hello everyone. I've been reading these forums for a while, ever since I picked up a dirty SX-650 for 35 euro (~40 USD) a couple of months ago. I've no experience working on amps but was hoping to get into the hobby since I love the look and sound of vintage audio gear, so I took my chances. The...
    • Gotaj
    • Thread
    • 650 channel distortion left pioneer sx sx-650 sx650
    • Replies: 6
    • Forum: Pioneer Audio
  12. jacobsteel

    Pioneer SX-650, cleaned, recap, resolder - persistent trouble...

    I found a decent Pioneer SX-650 at a fleamarket (200 SEK ≈ $20), it wasn't all dead, but had to get service. Now I've given some attention to: 1) Mains switch (opened, oiled/deoxy = stays on solidly, without buzzing sounds now) 2) Lights (changed smaller to LED, larger to new bulbs (might go...
  13. R

    Pioneer SX-650 Left Channel Failing Only On Phono

    Hi! I have a Pioneer SX-650 receiver I bought just over a month ago, supposedly freshly serviced, from a record store. In the past couple of weeks, the left channel has been falling out randomly. I swapped the L-R on my turntable (Pioneer PL-510A) and the left still fell out, so I know it's in...
    • Remac81
    • Thread
    • channel failure phono pioneer sx-650
    • Replies: 6
    • Forum: Solid State
  14. M

    SX-650 power switch help - but not the typical problem UPDATED!

    With an SX-650 that had symptoms of the typical power switch problem, I REALLY challenged myself to attempt to access/open/repair it. I was successful (including not breaking the tuner string - at least so far) but when reassembling the black faceplate, I'm coming up with not enough thread to...
  15. bberkom

    Pioneer SX-650 restoration suggestions

    I just picked up a functional but rough-looking SX-650 for pretty cheap in a craigslist deal. See photos. It is fully functional, and I get good sound out of both channels. There is a little too much background noise, but I haven't cleaned it up yet. I am going to rebuild a solid wood case for...
  16. surfnsound

    For your listening pleasure...

    Pioneer SX-650 with Lenco turntable playing on Goodmans Mangnum K. Just love that stuff.. :-) Cleaned receiver (Deoxit) Change volume pot (still sound at zero position, fixed) Manual adjustment of FM stage (not enough signal strength, fixed) New wood veneer (removed plastics, iron-on veneer)...
  17. R

    sticky, gunky stuff inside SX-650

    Wondering what to use to clean sticky, gunky stuff covered with dust inside an SX-650
    • rooney53
    • Thread
    • sx-650 tuner cleaning
    • Replies: 0
    • Forum: Tuners
  18. S

    Pioneer SX-650 Power Switch Cleaning

    I thought I share my experience in cleaning the SX-650 power switch issue. As usual, the symptom appeared when the light start to flicker and relay switching on and off. Searching the internet turn out to be power switch issue with x50 series. I could not find exact photos or instructions on...
    • seowsheng
    • Thread
    • cleaning flickering pioneer power switch sx-650
    • Replies: 4
    • Forum: Pioneer Audio
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