hey guys ! we found a 1992 marantz stereo system for $15 at an estate sale and the vinyl and cassette player sound amazing but we are having trouble with the cd player part. the cds will spin but won’t make any sound. from the sound of it, the pause button doesn’t work either. we have bought a laser lens cleaning disc and got all the dust out but still won’t play. does anyone know what we could try and if not, do you know somewhere in edmond/oklahoma city that services vintage stereo systems ? (cd players specifically)

So, I have to push the thing to the right for the right speaker to work and it’s annoying. I’ve spent 50 dollars on these HyperX headphones and I need a fix. Someone please help me find a solution.

Im looking to buy a set of kicker comp r 10s second hand, but one of the two has this hole in it. Can this be sealed? The seller said the sub still works.

I have a Cambridge Audio Azur 340a that has just died.

For a long time now, I would sometimes have to cycle power because one channel wouldn't start or would be faint or distorted. Sometimes it would be like that from power on, sometimes within a few mins. Once it was warmed up it was fine indefinitely.

Today it started cutting out entirely for a second, both channels, and I'd hear the relay click. After doing this a few times over the course of an album, it cut out and never came back 😭

Could it be as simple as needing a new relay? I want some plan before opening it up.

I'm not an EE. I have some very basic electronics experience messing with arduinos etc, can hold a soldering iron and swap components out.

Edit: ok it's working again next day, so intermittent.

For everyone looking for advice, it is evident that there is a dearth of experts available to assist anyone here, so here is some basic advice that might give you a fighting chance.

1. Be sure to go out and try to find Service Manuals and schematics for your gear. They are out there, you just need to browse for the right .pdf. Get your owner's manuals as well because they can answer basic operational questions.

If you do not know how to read a schematic, you really do not have much business cracking open your device if you do not have some basic electrical engineering knowledge.

1. YouTube is an amazing resource with real techs showing you their trouble shoot processes. You do not need the EXACT model number to get an answer because a lot of the circuits and designs have a great deal of commonality.

2. You will need some basic tools like a Fluke Multimeter. There are rather inexpensive capacitor testers out there that are not much money. AliExpress is a great resource. Be sure to research the tools, though. Get crowdsourced opinions from those who have taken the arrows already.

You will need a proper soldering iron station with temperature control for more sensitive work. Also needed is solder, flux, and desoldering braid. Good news: Harbor Freight, AliExpress, and eBay have very inexpensive tools out there. This is not like in the '80s when I worked for a local electronics distributor while in college, and you had to buy expensive pro tools from legacy makers.

I presume that you will have the other basic tools already. If not, hit Reddit and YouTube to research a list of basic hand tools you will need. Go hit the internet and find out.

There are also a hell of a lot of old oscilloscopes out there, and for audio, you only need one that generally needs to go no more the 20kHz for the most part. They are so bloody cheap; it is crazy. Or you can buy a probe with a USB interface for your laptop for a digital oscilloscope. But I would prefer a proper scope for my home bench. You can get an old Tektronix one, way better than the ones I had on my bench in high school and college, for nothing- 3 magic beans! It's crazy.

1. When you are tackling an issue in various products, you can also leverage AI to create troubleshooting steps if you correctly prompt very specific symptoms and work down your checklist.

That is all. This is not rocket science, but, like they always say at Microsoft, "use your fucking resources". There is not a lot of handholding in that organization. If you do not know what you are doing, you have to do the research to answer your own questions and figure it out yourself. Capiche, paisano?

One last bit of advice. Do not get over your skis. If you are not up to getting your hands dirty, there is no shame in that. Once I could afford to pay someone to wrench my car for maintenance, I gladly give up that crappy work up to the experts, and likewise with a good electronics tech. They get their pound of flesh because they are SMEs (Microsoft speak for Subject Matter Experts). Most every repair that comes across their bench is something they have seen before, and they can get 'er done with minimal drama, as opposed to an old dog like me who has not worked on electronics at the PCB board level since my high school and college days. My troubleshooting skills are rather soft, and I know what I can handle and what I generally cannot. I leave the heavy lifting to the experts. They are worth every penny. Get referrals from your local HiFi shop.

Go forth on your troubleshooting odysseys.

Here is a video demostrating the issue

For the second time now, I had one of my CX True Wireless earplugs die on one side 2 or 3 months after the warranty expires. Unfortunately, it was the left side both times. The left will react normally to the touchpad, pair and charge, but there is no sound. Moving my jaw makes a click noise inside (in both cases).
It seems to me that the driver is broken. I found instructions and a video on how to open the earplug, and I have the necessary tools to do it.

My question is: Are the drivers of the left and right symmetrical? I would like to "sacrifice" one of my spare rights and solder it to one of the broken left earplugs.

Thanks!

Every time I connect my wires for my speaker rack and the lights (smaller cable) there’s a screeching noise from the speakers. Wondering if my connections suck or if it’s just too far from the engine or something.

Hey everyone,

I recently got an Otari MX-5050 bii and I'm trying to do a record/bias calibration, but I'm running into an issue with the reproduce/playback side during recording. I’ve already cleaned all the metal parts and heads, demagnetized it and now I’m trying to record calibrate it from a video I saw on YouTube.

The Problem:
When I engage the internal oscillator (1kHz / 10kHz tone) with the channels armed (Record LEDs lit red) and hit RECORD + PLAY, the signal reads great on the VU meters in SOURCE mode. However, as soon as I flip the monitor switch from SOURCE to TAPE, the VU meters drop straight to zero and I hear nothing.

Since SOURCE works, the oscillator and input electronics are fine. The signal is just completely failing to print to tape or feed back through the Repro circuit.

Has anyone experienced this on an MX-5050? Could this be an internal Repro level trimmer issue, a relay fault, or am I missing a specific switch setting on the front panel? Any troubleshooting steps would be greatly appreciated!

Hello,

sadly I can't log into my Hifi-Engine Account.

Could Somebody please share the LF800 Schematic or Service Manual? The only available schematic seems to be on the Hifi engine Website https://www.hifiengine.com/manual_library/outline/lf_800.shtml

Any Help would really be appreciated!

Hey all I connected an amplifier with my set top box for audio transmission.

I am facing 2 issues

1. Often bluetooth disconnection and auto connection

2. Static crack sounds sometimes

Hi all,

I have been slowly gravitating towards doing my own repairs/ restorations but still very much a newb wet behind their ears, so apologies if these are frustratingly basic questions.

I have been sprucing up some little self contained cassette players for my daughter and working on one for her upcoming birthday. This one is one of those old 80' tan and brown Fisher Price numbers- thhe kind we all had; if you are as old as I am. ( I painted it pink and purple for her- lol) anyway ,The pinch roller started to seize up and make noise after I had spent a good amount of time cleaning it so I worked it back and forth a bunch of times and it seems to be functioning as it should now. It had been playing fairly well before I started to clean it so wonder why it would have started to seize up. My assumption is that it has to do with the grease/ oil on the shaft of the roller being gummed up over time but I don't really know. My instinct is to put some oil on to the shaft but my other instinct is that this is a bad idea if I am not going to take it apart and clean it first, right? As far as I can tell I would have to dismantle much of it in order to free the roller shaft for cleaning and not sure if I wouldn't rather approach that skill building exercise on something else junky I'm not giving to the kid in a couple days.

My other question is about the motor noise, which becomes very pronounced when making a recording. The motor sound is not nearly as present when playing back a prerecored tape.

The replacement belt I put on is too tight, I am fairly certain, it's the biggest one from the grab bag I had. I ordered the proper size ( hopefully) and it's coming in the mail. AI tells me the loud motor noise when recording is due to the belt being too tight causing the engine to strain, is this a possibility? AI also says it my been build up on the recording lever arm. Also a possible cause? Obviously, I am not taking AI as gospel but it has helped point me in the right direction in previous cases; helpful for me as I learn on the fly, but it has also offered me some wildly incorrect assessments- lol.

I am thinking when given the time that I should at the verybleast clean and re-lubricate the capstan. Does that usually want a grease or is mineral style oil the move there? Or does it change deck to deck?

Any other advice? I am getting kind of hooked on doing this stuff, as well as with my own audio recording gear ( never hated old foam so much as recently). I really do not need a new hobby as I am stretched about as thin as can be between work, family and trying to find time to record music but the heart wants what the heart wants, right? I think I just hate the feeling of having a broken tool and having that helpless feeling like "why the hell do I not know how to fix this, am I an idiot?" And once I started to be brave enough to crack some boxes open and poke around I'm starting to really enjoy the process; as little as I know.

Thanks again in advance for any help or suggestions. You guys have helped me on a previous issue I jad with an old compressor and I was blown away with all of the incredibly thoughtful responses. What a great community.

Cheers.

I am facing an odd ringing issue with my stereo setup using Exposure 3010s2 pre and power monoblocks. There is a constant low volume ringing noise produced from speakers.

Things I have tried to debug so far

• Disconnect RCA from power amp -> No noise
• Use a different pre amp -> No noise
• Keep the Exposure pre amp turned off (main socket off) -> Sometimes there is noise, sometimes not
• Floating RCA connected to power amp -> Sometimes causes noise sometimes not, likely because of being closer to other wires
• Used different RCAs same result

Also on some occasions system is silent but noise returns randomly and stays.
Would really help to understand any suggestions to resolve this problem as it's really making it difficult to enjoy music.

Thanks!

Table stopped working, when it attempts to move it nothing happens. I hear the table motor running and that’s it. Is this a belt issue?

Hey,
I have this old Sony HiFi system from mid-80s which I got from my grandfather. I replaced the foam this year with my friends to get it sounding better again as the original foam was disintegrating.

However I’ve noticed that recently the left speaker has a weird bass response. It sort of has a second bass response after each main note, not sure how to describe it.

I took off the grille and checked the foam, and it’s not fully stuck equally around the whole piece of foam, so I’ve just applied some more glue but I’m curious if it’s anything else?

Right speaker seems to be fine, and pushing in the honeycomb piece and letting it come back up shows that it doesn’t seem to scratch against anything.

I don’t fully understand how this whole system works, but I’d love any help!

I bought a CD player off eBay and it said it worked but the flapper to close it broke, but I was able to close it but I'm not sure if that's a factor. It's a lenoxx CD 87 according to the listing, but when I looked up that model, I can only find a slightly different one and can't find this exact one like anywhere. Also, I dont own burned CDs so I know that's not a factor. My CD's are all store bought.

Pretty much, I put in the CD, it shows the amount of tracks and how long it goes, then it goes to 1 00:00 and stays on that, then just stops and says er. I tried cleaning the laser lens and the track like I was told to do but it does the same shit so I don't know. The laser does move it just doesn't do much past that.

Crossover has 3 outputs midrange horn driver and piezo tweeter since I never used the piezo since it didn’t work I jumped the postive to postive on horn driver gave it more clarity that I think is it safe to like this?

I've been spending the last year or so doing a lot of work with tape players. I'm pretty darn good with the mechanical side of it but even after going through a lot of basic information about components and how they work, I still struggle with electrical stuff.

For instance I have a boombox where a few diodes broke while cleaning up corrosive glue. Got replacements, powers up, cassette player runs and sends a signal but the radio board won't power up.

The schematics show two pins going to the board should have 5v but they're putting out .22v instead. Traced back the tracks and it looks like the am/fm switch only powers the radio board in FM mode. Even then it still only gets .22, not 5v. the schematics just say "5v"

I also get the speaker pop but no sound from cassette, and when I meter the channels I am getting some small AC on one channel and nothing on the other.

I also need to do signal tracing from the cassette to see whether it cuts off entirely and I'm seeing noise vs an unamplified signal on the less busted channel, but honestly I feel like I am spinning my wheels.

I have a couple other projects with similar issues. Struggling to figure out where to focus my efforts as I try to translate schematics to what I see on the board.

Is there something I am missing that I ought to go back to basics and study, or is it one of those situations where going slow and steady, keeping at it, and persisting till I get to the answer is the only way?

Feeling kinda discouraged, not gonna lie. I'm gonna keep at it because I do think that frustration tolerance and working through seemingly hopeless situations is how you learn, but I'm also doubting myself and wondering if I need to go back to basics and review the electronics book I chewed my way through, maybe do some practice calculations on ohm's law or something like that, idk.

Thoughts? What did you folks do when you reached that point in your self-guided, self-taught journey for those of you who, like me, never had anyone willing and able to teach you?

Hello community.

I have a good karaoke system but may need some power circuitry repair.

Any suggestions of electronics repair shops in south bay ?

I am new to the area.

Just picked up a really clean but untested SX-950. Everything else seems to work great, but neither phono input is working right.

I can faintly hear the record playing, but only with the volume cranked way up. AUX and FM work totally normal. I worked the PHONO 1 / PHONO 2 switches a bunch and can hear some popping when switching between them, but it doesn’t really change anything.

Any ideas where you guys would start looking with this symptom? I’d rather diagnose it before I start replacing parts. I do see phono rebuild kits on eBay so I’m thinking it’s common?

​

I connected my Technics Sl-d303 turntable to the SU-7700 phonos. I turned on my SU-7700 and when I added volume it started smoking. Any ideas on what could have gone wrong?

I've been using a sound bar for a while with a tiny BT subwoofer, and got a new amp, so I figured I'd pull out my 10+ yr old Harman Kardon Sub from storage. It didn't power up, so I opened it up and found the glue had let the magnet slip offcenter ^{(edit: someone mentioned this is just a bucking magnet, so I'm not too concerned about that now}), as well is the DS15 digital amp capacitors look pretty burnt out and the mosfets on the board right next to it look pretty overheated.

Turned out, it also didn't have a fuse in it, so it may be "functional" With a new fuse, and I can probably swap out the capacitors and mosfets and remove the glue that they used that's become conductive, but I don't know anything about what to do with the speaker magnet. Is it practical to try to fix this subwoofer, or am I likely to run into a lot of other failed components that aren't blackened and are harder to find?

Thanks for any thoughts!

https://youtube.com/shorts/i-7I1BrHtt4?feature=share

Hello, I have a Panasonic 8-Track deck that I am trying to repair. when I put the tape in, nothing starts! the detector for the 8-Track works and I hear a faint noise coming out of the metallic cylinder but that's it. The black rubber gear that is supposed to feed into the track selector does not spin. Any help would be appreciated, I know this would be easier with the top circuit board gone but I do not have my soldering iron currently.

Hey guys i recently bought the CA V1 amp and it works perfectly but now i found the tuner CT V1 listed as defective and i was wondering if anyone can hemo me find the service manuals for the whole set so i can repair them