• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

short

  1. akadrhouse

    Marantz 2226 Restoration - Shorting under load

    I've rebuilt a dozen or so units at this point, but I am still very much a noob when it comes to troubleshooting issues. I do have a scope, but my ability to use it is horrible other than testing clipping and setting bias with it. It is my 2226 and I decided to give it an overhaul. Unit worked...
  2. goldswimmerb

    So today I learned (on a Yamaha M-60)

    Been working on getting a blown up Yamaha M-60 up and running after another shop butchered it. Fairly easily got the amp section all worked out as I've done a few now and it's pretty much always been the same parts blown in each. This one, though, was probably the 2nd worst I've seen from a...
  3. G-901

    G-901 Rebuild Help, amp showing a short

    I recapped most of the unit and went to test it with a dim numb tester and everything is ok unless I plug in from the power protection board the main oval capacitors, then the bulb shines bright indicating a short. I checked the output transistors and they are all fine. Driver boards are pulled...
  4. OakBayou

    2226B Rebuild Help

    First, let me thank everyone who participates here past and present. This forum is the primary thing that got me into vintage gear, and built my knowledge and confidence to try to conserve the Marantz magic for future generations. I've gotten myself into a pickle with this unit and hoping I...
  5. richardg0n

    Marantz 2325 Pre-out female RCA short no sound

    Working on 2325 with left channel out. The sound output returned when I was using RCAs to test and crossing channels between Pre-out and Main. I noticed RCA was sensitive to touch on one of the Pre-Out RCA outputs causing the left channel sound to cut in and out. I used Deoxit D5 spray and...
  6. dustmaker

    Technics SA-700 ‘smokin’ hot

    I am on a journey and I need some guidance from the experts on a very nice looking Technics receiver. It only has one known minor issue......when you turn it on its start smoking I put it on a 100watt DBT and it still smokes. There are 4 resistors on the left channel that are all burnt. Two...
  7. M

    Mc7150 shorted swapping bulbs, won't turn o

    I was swapping bulbs on an mc7150, flipped it on to test the bulb i had just done, the bulb tails crossed and shorted. Fuse on the back is still good. Won't turn on... how bad did I screw this up??? Any ideas where to start looking?
  8. HUM

    Did I fry my Harman Kardon? Please assist. Ty

    While trying to remove the 8v fuse lamps on my HarmanKardon 730 twin power i touched both sides with the pliers. Should have never been on. Unfortunately the lamps that were on, like the pointer and one behind the dial, went off. After installing the new bulbs behind the dial none of the lamps...
    • HUM
    • Thread
    • diy fuse harman kardon help hk730 lamps short twin power twinpower
    • Replies: 11
    • Forum: DIY
  9. Richs_Trains

    Marantz 140 amp DBT dead short question

    Hey all, I have a Marantz 140 amp that I replaced some diodes on several years ago because the peak indicators were stuck on. After this fix, the unit worked fine and I had it in the living room on a 3200 for several months with no issues. A couple of years ago I swapped the unit out for a...
  10. NickDeO

    KA-6160 Shorted. SOS!

    Hello AK, I’m working on a KA-6160 receiver that needed a few new caps in the power supply. In attempting to adjust the bias after properly installing the caps, it appears that at least one of the output transistors has shorted. Now, the DBT is fully lit and nothing powers on. The only fuse I...
  11. robbarrow

    Weird problem with Fisher 500 C radio

    I am in the process of restoring a Fisher 500 C. Following what seemed to be "everyone's" advice, I didn't even plug the receiver in until I had recapped it. Along the way I had to replace one of the little switches on the front - I think it was the Low Filter and after I started listening to...
    • robbarrow
    • Thread
    • 6ha5 fisher 500c radio short
    • Replies: 29
    • Forum: Fisher
  12. NickDeO

    SX-680 Restoration Troubles

    Hello, AK! Recently, I picked up a Pioneer SX-680 for $30. The guy I bought it from claimed that no sound came out due to a cracked PCB. Nice guy he was, he was even willing to open the thing up in his kitchen to show me where it was. I've since glued the cracked board and repaired the...
    • NickDeO
    • Thread
    • buzzing hum humming pioneer repair short shorted sx-680 troubleshooting
    • Replies: 80
    • Forum: Pioneer Audio
  13. badspell68

    Yamaha CR-1040 - New Bulb Fast Burnout - LED Too "Help"

    I have tried several LED and Incandescent bulb replacements on my Yamaha 2040 Meters and all burn out in a few days. The LED's resistors overheat and burn out and the incandescent simply but out. After watching some vids, it seems that the current is 29 to 30 volts? Does this suggest a problem...
  14. tonymaine

    SR 840 clicking only when speakers selected

    Marantz 840. Unit powers on. All displays ok. Problem is when speaker A or B is selected there is a repeated click from the unit under the speaker connections. Does not do this if no speakers selected. I assume some kind of short back there. I have cleaned and check for any visible shorts but...
  15. Stink Bear

    RS-2004A, finding a short in the power amp board

    I replaced the shorted STK-0050, Q10, Q16, and R46. I powered up on a DBT and still had a short. I de-soldered the power feed to the power amp board and powered up, no short, so it's definitely on the power amp board. If I turn the unit on to "phones" there is no short and the headphone jack...
    • Stink Bear
    • Thread
    • power amp board rs-2004a short
    • Replies: 0
    • Forum: Fisher
  16. L

    Need help B&W speaker short?

    I have a set of beloved 1995 year B&W DM640i with 6.5” yellow Kevlar midrange 4 ohm. When the speakers were playing, the midrange frequencies were phenomenal. Recently one of the midrange speakers stopped playing. The speaker plays if I depress the cone in about an 1/8” of an inch. I’m getting...
    • Lossless
    • Thread
    • 6.5” 640 640i b&w blown driver kevlar short speaker speaker cone
    • Replies: 0
    • Forum: Speakers
  17. MrBill—1

    SONY STR-V6 intermittently dropping the right channel.

    I posted in the DIY forum also. Newby here and just learning where to post. Sorry about that. I have had this receiver for a couple of months now and have been happy with it. Recently the right channel has been dropping out intermittently. This can’t go on. Seems to be getting worse. Where...
  18. G

    Philips 594 blows speaker fuses, fine with headphones

    Hi guys, A friend of mine recently brought me this integrated amp. It was about to be thrown out by the owner of a local bar, because both channels cut out one after the other. So I took it upon myself to try and safe this nicotine brown workhorse. Initial testing with headphones revealed...
    • Gertjan90
    • Thread
    • 594 circuit fuse headphones philips short speaker
    • Replies: 24
    • Forum: Solid State
  19. Homer4beer

    Woops! Shorted transistor during testing...blew fuse

    Hi guys, I've been trying to trouble shoot my Marantz PM7200 amp with the help of member MBZ (he's been AWESOME). Well I stuffed up and slipped while testing the emitter of a transistor with an oscilloscope. Yea I slipped and shorted it out with some minor sparks. I removed ASAP and turned the...
  20. S

    Advent 300 - help diagnosing a short

    Hoping maybe some of the wonderful techs around here can help me out. I have an Advent 300 receiver. I performed a full recap (all electrolytic caps replaced as well as tantalum caps) per the David Reaton website. After recap, amp was brought up on dim bulb tester. Amp was working fine. DC...
  21. S

    Is current leaking from my SX-850?

    I am new to this forum. I am an electronics amateur and collector of vintage audio. I am certainly no expert. I own several old amps, including a Pioneer SX-850. The unit was a dud when I bought it but I replaced the power board and now it works like a champ. Recently, I noticed that when I...
  22. Richs_Trains

    4230 DOA Amateur Needs Help

    Hey All, My newest project came in sad shape with the power cord cut off and a monster fuse in the fuse holder. It is a Marantz 4230 Quad unit. I put a new cord and proper 3a fuse and put it on the DBT. I get a bright light and no power in the unit (I don't know if I should get anything if...
  23. bigmike661

    Sansui G-9000 started smoking ??

    I know my stereo needs to be restored,i had the top off ,so i plug it in ,turn on power,i started to see alittle smoke,i unplugged it,whats to do next,any suggestions?
Back
Top Bottom