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diagnosis

  1. getthedog!

    Pioneer VSX-3300 - relay clicks but no display or output

    I've got a VSX-3300 which turns on (volume knob lights, relay clicks) but that's it. Fuses are all OK I'm seeing 5v and 2v in places Power button functions OK 12v rail appears dead - checked at the test points and other plug pins Relay on the small transformer board clicks and stays engaged...
    • getthedog!
    • Thread
    • amplifier problem diagnosis help issues pioneer power vsx vsx-3300
    • Replies: 5
    • Forum: Pioneer Audio
  2. R

    Trying to repair Pioneer SA-1490

    Hello all, I’m exploring a possible repair on a Pioneer SA-1490 receiver I got from a friend who insists it was working for him before giving to me. I’d like to save it from the recycle pile but it’s not working now. Two sentences about me. Although trained as a EE, I’ve leaned on more of the...
    • Rocky_714
    • Thread
    • capacitor diagnosis pioneer receiver repair transformer troubleshoot
    • Replies: 13
    • Forum: Pioneer Audio
  3. N

    PL-41 Motor Noise Diagnosis

    Recently purchased a PL-41 at auction for a great price. It needed to have it's belt and thrust plate replaced, as well as some cosmetic work, but apart from that, it seems like it hadn't been used much. I followed the instruction in the manual, and added two drops of sewing machine oil in the...
    • NightRaid
    • Thread
    • diagnose diagnosis motor pioneer pioneer pl 41 pioneer pl-41 pl-41 troubleshoot troubleshooting vintage turntable
    • Replies: 4
    • Forum: Turntables
  4. B

    30V-45V AC on Speaker Terminals (KA-2000A)

    Goooooooood evening my friends! This is my first post, I promise I scoured for info before making it. I have just pulled apart and put back together a Kenwood KA-2000A which I'm gifting to a mate. I never really used it, and suspected it had an issue tripping the houses RCD when connected...
  5. M

    Carvin V3 Hissing Issue

    Hello, I have a Carvin V3 stack. For months now it has a problem where it starts hissing out of nowhere, and it will do this whenever it feels like it. I've opened up the amp and tried fiddling with wires to see if I can get it to stop when it happens, with no luck. The only way I can get it to...
  6. redpackman

    Bose AWR1-1W Wave Radio - High Pitched Squeal in right channel

    The squeal is not affected by turning the volume up or down. I can hear the radio station playing but the high pitched squeal is very loud and makes it impossible to listen to it. The squeal is always there as long as the radio is on whether in AM, FM or Aux, high program volume or low...
    • redpackman
    • Thread
    • bose radio diagnosis help schematic wave radio
    • Replies: 1
    • Forum: Solid State
  7. Trekkie4

    Looking for second opinion

    Or third, or forth... You get the idea. Back in the early 2019, a very good & close friend of mine was diagnosed with invasive ductal breast carcinoma, stage II B. It was later classified as triple-negative, and after having intensive chemo therapy she had a surgery where it was surgically...
  8. Tangerine

    Pioneer A-9 - Goes into protection all the time, with loud pops in speakers

    Hello all. Hope you've been keeping well and that you and yours are safe. :) Problem Well last time I was here I was getting this A-9 beast back up and running, and running quite well these past couple of years, with one minor issue. That being the machine randomly going into protection (the...
    • Tangerine
    • Thread
    • a-9 diagnosis faulty pioneer protection circuit
    • Replies: 2
    • Forum: Pioneer Audio
  9. NicholasD

    UPS Power Supply Not working off Batteries, 240V mains OK.

    Nikko / Powercom 1500VA 900W Line-Interactive UPS MODEL: BNT-1500AP I have / had this UPS in my Studio and every night at around 11pm it would switch over to generator power, thus engaging the UPS batteries briefly while it switched over. Now my computer goes off as the UPS does not seem to...
    • NicholasD
    • Thread
    • batteries battery diagnosis no power power supply powercom repair ups
    • Replies: 1
    • Forum: Solid State
  10. B

    Marantz PM 7000: Power Button Diagnosis/Tips Request

    Hi, I'm new here and am hoping for some insight into what is happening with my amp and whether it can be fixed. I have a Marantz PM 7000 Integrated Amp that has served me well for a few years. A week ago it stopped working. On closer inspection, I realized that the problem is in turning the amp...
  11. Ronito6

    Mr. Carlson works on a Sansui Sansui B-77

    Yeah....it's just a B-77 but there is good stuff here I think. (For a low level EE hobbiest like me at least.) He lavishes praise on Sansui engineers at the 9:33 mark. (And at a couple other points further along the way.)
    • Ronito6
    • Thread
    • b-77 diagnose diagnosis repair sansui restoration test eqipment
    • Replies: 3
    • Forum: Exclusively Sansui
  12. T

    Marantz 4240 left channel sounds fuzzy and muffled - video link in posting

    Hi Gang! First time posting here, let me start by saying ahead of time that I respect and appreciate everyone's expertise here on AK. I have a wonderful old Marantz 4240 that has served me well over the years. Recently a friend came over to listen to a mix of some recordings he recently made...
    • the retro la
    • Thread
    • 4240 amplifier diagnosis left channel distortion marantz marantz 4240 muffled power amp problem
    • Replies: 5
    • Forum: Solid State
  13. T

    Need Diagnostic help with McIntosh MR 7082 Tuner

    I'm looking for help diagnosing a problem with my tuner. Appreciate any guidance or referrals if a professional repair is indicated. I acquired it along with a C31V preamp and MC7270 Amplifier. The units were dormant for several years. Most have come to life. The tuner only works with AM...
  14. Johnny_Law

    Diagnosing a mute MC2300?

    McIntosh gurus, I recently acquired a studio-abused MC2300 without any pc boards. I purchased new circuits directly from McIntosh (part# 04424300, from Brian Scott in McIntosh Customer Service Parts Department). I installed the boards but alas, no sound. The unit turns on and lights up and...
  15. RolyShoes

    Misbehaving Sansui 4900 Amp

    This is a shot in the dark - I'm new to this group and audio repair so please be kind! For a few years now, my Sansui amp has been kicking off intermittently. It currently is emitting a ferocious crackling and popping through the left speaker whilst the right one is okay. This can carry on for...
    • RolyShoes
    • Thread
    • amplifer diagnosis home audio sansui
    • Replies: 9
    • Forum: DIY
  16. Franco989

    Fisher RS-1080 channel imbalance

    Hi Everyone, Got my first Fisher (traded a turntable for this beast) and it has some issues. The right channel is lower than the left, from my perspective the left channel is where the volume should be (at 170 watts the volume knobs is usually puts out alot of power without turning it up to...
    • Franco989
    • Thread
    • diagnosis fisher help receiver rs-1080 solid state
    • Replies: 16
    • Forum: Fisher
  17. Johnny_Law

    McIntosh MC502 No Sound At All. No Normal lights.

    I acquired some Mac gear in poor shape (see http://audiokarma.org/forums/index.php?threads/price-check-on-jbl-mcintosh-gear.698168/) I managed to save the C24 with some new transistors! However, it seems to have very weak output - unimpressive, at least - and research has led me to believe the...
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