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power supply board

  1. kennycrippen

    NAD 214 Troubleshooting

    I’ve been restoring a NAD 214 power amp with my 9 yo son for a fun learning project. He’s been doing great with soldering and staying interested. Initial symptoms were: unit powers on, soft clipping light stays on, no relay click. Front lights stayed on even after unplugging the unit suggesting...
    • kennycrippen
    • Thread
    • nad nad 214 power amp power supply power supply board relay restoration restoration help
    • Replies: 31
    • Forum: Solid State
  2. L

    Cambridge SoundWorks 2.1 Help

    Greetings from Nebraska, I recently picked up this set of speakers from a Goodwill for $10. I didn't know anything about them, but the included carrying case with cables caught my eye. The label on the subwoofer unit reads - "SoundWorks by Henry Kloss, copyright 1996 Cambridge SoundWorks...
    • _Luke_
    • Thread
    • audio question cambridge soundworks power supply board soundworks wiring help
    • Replies: 4
    • Forum: Speakers
  3. vwong688

    SX 850 No Relay Click - Replacing Power Supply Board

    Hi, There are lot of things going on on this SX 850 I am trying to restore. I have replaced the capacitors and transistors according to the parts lists floating around on AK. I have to admit because it was my first time attempting electronics work like this, mistakes were made. After...
    • vwong688
    • Thread
    • pioneer pioneer sx850 pioneer sx950 power supply board relay sx850 sx950
    • Replies: 8
    • Forum: Pioneer Audio
  4. M

    STA-2300 power supply issue

    The issue started when the eq amp developed a loud hum. Then, I noticed that with no input and volume maxed, there was a similar, but faint hum in the aux input. In testing the power supply board I found AC ripple on the B+ and speaker protect/relay supply outputs( pins 8,[9: not shown],10). The...
    • Matt_ME
    • Thread
    • eq amp hum power supply board relay board speaker protect board sta-2300
    • Replies: 2
    • Forum: Solid State
  5. Rob357

    Rebuilding another Pioneer SX-850 Hum issue

    Hello folks! My SX-850 is on the bench for some new shiny parts. I had enough for the power supply board and ordered kits for the flat amp/tone board and the amp drivers and adjusters. After the power supply was done, I powered it up and success! Speaker relay clicked in. Great, I thought. Not...
    • Rob357
    • Thread
    • awr-101c power supply board sx-850
    • Replies: 4
    • Forum: Pioneer Audio
  6. S

    Did I burn this power supply?

    I have just took the capacitors out of this power supply, and I'm a bit worried about those brown-ish spots that formed around the connections, do these look like I burned the board? and if so, anyway to "fix" it? I have read that burning things is unlikely if you're careful because not many...
    • sabalennon
    • Thread
    • burning capacitor desoldering power supply power supply board receiver soldering soldering iron vintage
    • Replies: 7
    • Forum: Solid State
  7. toymanmsp

    Pioneer SX-727 - Relay Issues

    Greetings everyone, I've run into an issue where the relay is not coming out of protection mode. Resources used for servicing 727 Have and use DBT Lot's of photo's DVM Transistor Tester Electronic Solder and Desolder Stations Original Service Manual Willingness to learn, I'm rather new at...
    • toymanmsp
    • Thread
    • head amp power supply board protection board protection relay sx-727
    • Replies: 76
    • Forum: Pioneer Audio
  8. goodshelac

    Sansui G-8000 help!

    Good Morning! I need a little help getting my G-8000 to power on. Last night I was adjusting DC offset on the left channel which I did no problem. I went to connect my leads from my DMM to adjust the bias and I must have connected to the wrong test point. When I connected my negative lead there...
  9. Conspheracy

    Infamous Kenwood KR-9600 in Protection mode.

    hey everyone, i'm new to audiokarma This particular receiver was my father's and he gave it to me as a house warming gift. It sat for a few years before I finally set it up with the original speakers in my home a few weeks ago. Upon the initial setup the relays did not want to close but after a...
  10. H

    Yamaha CR-1020 idling current not adjusting

    Hi, On a Yamaha CR-1020 I’m having trouble getting the idling current to adjust to anywhere near 10mV. Left channel: 100.4mV Right channel: 0 mV Following Merrylander’s advice (see below) I’ve replaced both 2SA844 transistors that sit just under the variable resistor. I’ve also replaced both...
    • Hifibythekg
    • Thread
    • amplifier board idle current merrylander power supply board yamaha cr-1020
    • Replies: 140
    • Forum: Solid State
  11. H

    Yamaha CR-1020

    Hi, Can anyone offer advice for replacing a transistor on a Yamaha CR-1020 power supply board? At location TR714 lives a 2SA844. KSA1015 was many times recommended as a substitute on Audiokarma but I believe it's no longer available from reputable distributors. Will a KSA1220AYS work in this...
    • Hifibythekg
    • Thread
    • 2sa844 ksa1015 ksa1220ays power supply board tr714 yamaha cr-1020
    • Replies: 46
    • Forum: Yamaha
  12. G

    Aerius I power supply board

    Hello, I have a new power supply board coming that I bought off eBay, I’m a little worried because the current one I have has four wires at the top right and the one I ordered only has two. I’m not sure what to do.
    • Gimpy95
    • Thread
    • electrostatic martin logan aerius i power supply board
    • Replies: 2
    • Forum: Speakers
  13. LWB

    Another take on SX-1010 AWR-054 power supply heat management

    Somebody in another thread identified the SX-1010 power supply as a cause of global warming. A fair comment! It seems that every SX-1010 has a broiler built into the power supply. When it comes to trouble-shooting &/or refurbishing the SX-1010, the power supply is at the top of the list...
    • LWB
    • Thread
    • awr-054 power supply board power supply overheating sx-1010
    • Replies: 13
    • Forum: Pioneer Audio
  14. Q

    Sansui Receiver 881 Power Supply Board problem.

    Hello from Peru. I own a Receiver 881, but it does not make a sound. Few years ago the receiver start to put on security mode (the security relay in the F-2437 power supply circuit board click and the sound goes off) when this happened it was connected to my audio device (Focusrite Scarlett 2i4)...
  15. hertzdonut

    SG-9500 recap, but a headscratcher, at least for this rookie

    (Preface: I've fully recapped two SX-850's and a PL-630; so it's not my very first prom. ;)) My SG-9500 worked great previously. My choice to recap was simply for longevity's sake. I hit all switches with DeOxit first, and then went on to recapping once my parts arrived. I started on the power...
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