troubleshooting

  1. 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...
  2. T

    Looking for help diagnosing buzz/hum/ground loop in my "HIFI" GUITAR rig!

    I have been experiencing a bad, loud, and variable noise in my electric guitar rig. Here is the details of the rig (I will include as many details as possible since ground loops are tricky): > Electric Guitar (active electric guitar with on-board buffer, 9V battery, and On-Board Effects Loop...
  3. B

    Marantz 4400 Troubleshooting Help

    Greetings, I am hunting down a short in my marantz 4400 but needed to turn here for some help. Here are the steps and results I had gotten so far with replacing components and my dim bulb tester: - Got the unit from a garage sale as "not working." Hooked it up to Dim Bulb and bright as can be...
  4. B

    Troubleshooting Wharfedale W70D Mid-Bass

    Hi all, I'm new to speaker restoration, and would appreciate any advice-- I've just purchased a set of Wharfedale W70D speakers, with both tweeters dead (as expected, to be replaced) but also one dead 8" mid-base. I opened it up to trace continuity, and found that the driver itself is the...
  5. VictorRCA

    Stiff slider on cassette deck locks up mechanism.

    On my humble 2-head Mitsubishi DT-12 cassette deck, there's a slider which engages when recording. This isn't like a fader, it's either engaged or not. This slider bypasses cassette audio and plays the Audio In. The issue is that the cassette mechanism needs to pull the slider to record, however...
  6. Reyhifi

    Code red, or close enough. Sta 820

    I been trying to get this realistic 820, belongs to a friend. Very dead on arrival, one fuse dim bulb glowing. Outputs were bad, a cooked transistor for good measure the filter caps were replaced. My limited experience, has me going around in circles. If I hook up a speaker to either A Or B...
  7. U

    Rotel RA-12 Bricked!

    I'm really hoping to find help here. I recently purchased a Rotel RA-12 secondhand. It was in great working condition then I decided to update the software. Because why not?... Well, it was more complicated than expected since I have an early model that has a usb connection on the back panel...
  8. M

    Fixing the Listening Monitor - Yamaha A760II

    Hi! So I'm pretty new to the analog audio community and this is kind of my first project. The Story: My dad gifted me a broken A760II. It had some shorted output transistors, which took the drivers and pre-drivers with them. After fiixing up the PSU replacing burnt resistors, some dried up...
  9. B

    Marantz 2215 - Lost left channel in FM stereo after re-cap

    I've been refurbishing a Marantz 2215 and just re-capped the MPX stereo decoding board (P400). Before recapping this board, everything worked fine. After re-capping, I no longer get output in the left channel in FM stereo mode. I get output in both channels when in mono mode. In aux mode I...
  10. Mat86

    A-1 buzzing when I touch the volume knob?

    Title verbatim, when I touch the volume knob on this I get a buzzing noise through my speakers. I noticed this when I first got the unit and now that I've done some work on it and fired it up again, was reminded the issue's still there. (The A-1 in particular has a weird pot where the balance...
  11. C Hart

    Equalizer hum when engaged, silent when disengaged

    Hello solid state gurus. Thanks for checking out this thread and for any help you can provide. I have very little experience in repair or rehab on solid state components, and I hope someone can help me with suggestions for an equalizer that recently started misbehaving. My Alesis M EQ-230 30...
  12. T

    Sony ta-4650 inputs bleeding through?

    My ta-4650 has a weird thing where if you have an input going into any of the line level inputs (haven't tried it with phono yet) and you switch to either the tape monitor or any of the other channels the signal from the input will be audible even if you have the volume knob turned all the way...
  13. E

    Testing coils

    I'm trying to test some coils for continuity, but I'm not sure I'm doing it right. Below are photos of 2 of them. For both of them I tried to test resistance between the bare wires you can see connected to the tabs at the top and bottom of each coil. Is that the correct place to measure from...
  14. S

    Troubleshooting Nakamichi TA-1A

    Hey all, new to the forum. I've got a Nak TA-1A that is no longer turning on, looking for some guidance on what the problem might be. I've go a service guy I'll be taking it to, but like to go in with some understanding of the possibilities, and I just like to learn about troubleshooting. It...
  15. S

    Pioneer SX-650 Protection Relay Issue

    Hello everyone, I hope you can help me. A few days ago my beloved SX-650 suddenly stopped working during a listening session. I turned it off and on again and noticed that the clicking noise from the protection relay was missing, so I went to this forum and looked for answers. I got my...
  16. powrviolence

    Novice PL-10 Troubleshooting

    Hello all, Apologies in advance if this is 1: not the appropriate place to post this and 2: these issues are commonplace and have been answered elsewhere. I got 1972 Pioneer PL10 and the audio quality is full of static and is of overall of poor quality. I am a complete beginner in the world of...
  17. S

    Fisher 400 both channels distortion

    My Fisher 400 seemed to hit some trouble today. I went to listen to dizzy gillespie for xmas eve and what I heard didn't sound like the dizzy I know. The music is there but choppy and distorted almost like poorly received FM stations crossing bands. This is happening on both FM and Aux, I...
  18. C

    Pioneer CT-F750 Tape Sensor Problem

    Hello! My pioneer CT-F750’s tape sensor button seems to be causing problems with playback, FF, RV, etc. This deck functioned great until tonight. It seems that the sensor button only actuates if pushed in very slightly. All the way out, and the deck won’t play. All the way in, and the deck will...
  19. dragnalus

    Troubleshooting a random crackle in a Marantz 2270

    I've had my 2270 for over 20 years, and I had it re-capped about 8 years ago. It's worked great until very recently. The right speaker channel, has a loud crackle that happens at random times. I'm trying to troubleshoot why this is happening, and am hoping folks here can help. Here is what I...
  20. P

    Yamaha CR-200 weak channel *speakers only* - suggestions?

    Looking for a suggestion where to start on troubleshooting this. I bought restored, and it has been in the kitchen of shared office, working fine for a couple years. -- 1. Recently it stoppped working, was producing only distorted sound in one channel, other channel dead. 2. I checked fuses and...
  21. A

    Speaker Cutting In/Out and Volume Increases

    Hi all, I disassembled the head module on one of my KEF 105.2 speakers to try and replace an LED that glows at various wattage readings and helps you position the speakers. I decided I'll try to clean the connections (there's a small PCB in there) instead. Used Deoxit F5 and D5; sprayed visible...
  22. Q

    Altec Model 14 troubleshooting help

    Hi guys, I have a pair of Altec Lansing Model 14 speakers that I need some help troubleshooting. The issue I'm having is one speaker sounds thinner than the other, like its missing something - middle or low end maybe, or maybe the top end is too pronounced, hard to say. It almost seems like...
  23. T

    Marantz 6006 says 'unsupported' disk after lens cleaning

    Hi everyone, I wound up here after doing some googling on my CD player issues and it seemed like a nice place to maybe ask for some help so I'm hoping that's alright! My Marantz 6006 CD player sounds great but it's developed a habit of skipping around obnoxiously on every CD lately, the same...
  24. P90

    Heathkit Blues with AA-21 Amp

    Hi everyone. I acquired a super-rare NIB un-assembled Heathkit AA-21 amplifier that I just finished assembling moments ago. Being that the kit is so old (even though the box was still sealed), I used new electrolytic capacitors and 1% metal film resistors instead of the originals. I didn't...
  25. K

    Need help troubleshooting SONY CD changer

    I need some assistance troubleshooting a Denon CD changer DCM-444 (not SONY, my mistake). It's a changer which uses standard 6-disk cartridges. I am waiting for a service manual and schematic to arrive. The problem is that when a cartridge is inserted and it tries to inventory the six CD trays...
Back
Top Bottom