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Recent content by KilgoreCemetery

  1. KilgoreCemetery

    Yamaha A-960 II Integrated Amp Won't power on

    Yeah, both of the output transistors on one side are shorted. However, desoldering them from the board doesn't change anything. Driver transistors TR334 and TR332 test fine and I have yet to find any other failed components. I even soldered in some temporary replacements for the output...
  2. KilgoreCemetery

    Yamaha A-960 II Integrated Amp Won't power on

    I've been troubleshooting this one for a while. First, it has a special power supply similar to what made Carver amps famous. I don't fully understand what each part does, but I know that it chops up the line voltage using triacs, almost like a slow version of a switch mode power supply. I've...
  3. KilgoreCemetery

    Nakamichi RX-505 Low 12V + and - Rails

    Thanks! I had a suspicion, but that's exactly the sort of confirmation I was looking for!
  4. KilgoreCemetery

    Nakamichi RX-505 Low 12V + and - Rails

    This one has been a really slow burn, but I finally made some decent progress! I bought a nice 12v power supply and tested all of the motors. They work! Then, I decided to just start rebuilding the power supply. I had already replaced some of the caps and the two C945 transistors, so I pulled...
  5. KilgoreCemetery

    Sansui B-2101 Calibration Woes

    Honestly, I wasn't completely sure. This thing has me second-guessing myself That's good to know! I do have the full service manual. I'll include a picture of the driver stage and output stage. If you want to see the rest of it, let me know and I'll upload what I can. Otherwise, you can get it...
  6. KilgoreCemetery

    Sansui B-2101 Calibration Woes

    Martaine2005: All suggestions welcome! I feel like I'm missing something simple and just need someone to point it out. I'll double check for more glue. I haven't checked all the electrolytics, but I did check all of them in the power supply section and driver stage Harald Kapp: I'll see if I...
  7. KilgoreCemetery

    Sansui B-2101 Calibration Woes

    I've been having some trouble getting this power amp finished up and I'm hoping someone can help me out. Initially, all I found wrong with it was a broken ground trace on the power board and some nasty, corrosive/conductive brown glue, which is common for this era of Sansui equipment. I ran a...
  8. KilgoreCemetery

    Marantz 2230B with Weak FM

    It's about the same on the signal strength meter. I'd say less than 1mm of difference. Also, I don't remember if I mentioned it in the original post, but I did swap out that FET, thinking that it may be a bit dodgy. Next time, I think I'll try testing it your way rather than spending a couple of...
  9. KilgoreCemetery

    Marantz 2230B with Weak FM

    Harald Kapp: The confusing part was that it wouldn't tune to frequencies in the FM range, but it sounds like you would just aim for 10.7MHz (for FM) and connect to the IF stage anyways kellys_eye: That's a lot of good information. I see what you're saying about the 10.7MHz. I tried that, but I...
  10. KilgoreCemetery

    Marantz 2230B with Weak FM

    So, I was able to get it figured out to some extent. You were right about it being a calibration issue. I was able to pick up stations close to what the 2230b manual wanted for the calibration steps. So, for 90MHz, I was able to pick up 89.7MHz, 106.1MHz instead of 106MHz, etc.. I was also able...
  11. KilgoreCemetery

    Marantz 2230B with Weak FM

    Well, that would explain why I can't find any failed components. I have a signal generator that works, but I've never tested the FM sweep capabilities. I'll have to mark the coils and do some research. Thanks, Kelly!
  12. KilgoreCemetery

    Marantz 2230B with Weak FM

    I've been troubleshooting this one for a while, but I'm no radio expert. Basically, strong stations won't tune in Stereo and a lot of weaker stations don't come in at all. The stereo light works when I switch to Phono, Aux, and Tape, but won't come on with even the strongest local station. Plus...
  13. KilgoreCemetery

    NAD 304 Integrated Amp Post-Repair Question(s)

    Thanks for your input Harald! It's such an odd failure, but I suppose that would explain it. I've been running the amp with no issues other than a sketchy speaker relay that I'll probably just end up replacing. I'll check capacitors too while I'm in there. I have an ESR Blue meter that's done...
  14. KilgoreCemetery

    Samsung TV PSB multiple symptoms/failures at the standby SMPS - own investigation hitting dead end

    I'm by no means an expert when it comes to repairing SMPS, but I pulled up the datasheet for that IC and gave it a quick read. This part jumps out at me: CS (Current Sense) The Current Sense pin senses the voltage developed on the series resistor inserted in the source of the...
  15. KilgoreCemetery

    NAD 304 Integrated Amp Post-Repair Question(s)

    I had an NAD 304 integrated amp that was stuck in protect mode. I measured about 14vdc in the signal path at the speaker relay and backtracked to the power amp section. Nothing looked physically damaged and, long story short, I found an open resistor. It wasn't burnt or cracked. I'm assuming it...
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