Jump to content


Photo

Static noise on tape play, bad caps?

Cassette Tape Deck Play Repair Noise Problem Conion Clairtone 7980

  • Please log in to reply
29 replies to this topic

#1 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 08 May 2016 - 10:22 PM

Hello all! This is my first post and i am very happy to see so much people dedicated to boombox repairs :D Here is my issue : I bought my clairtone 7980 for 300$, got to fix the belts problem with the unit, other problems will need to be checked out too but not right now. Tape deck 1 outputs lots of static noise on the right channel, i doubt it could be a switch problem, i cleaned them though. Someone sent me both the wiring diagram and the schematic in high resolution so i can at least trace the signal from head to speaker. But before i launch myself into all this massive diagnostic, has anyone ever had that kind of issue? Also, both decks motor's make buzzing sound (from speakers) when in power, and that can be reproduced on other modes (tape 1/2, radio, line in) i guess bad caps that are leaky are causing this.. In any case i could try to replace motors if all fails. Thank you everyone :)

#2 crazygamer

crazygamer
  • Members
  • 439 posts
  • LocationEstonia, Tallinn

Posted 09 May 2016 - 12:48 AM

Clean the record bar or record switch, this is located on main board, it needs some cleaning.  Easily recognisable, long bar it is.



#3 ralrein1

ralrein1
  • Members
  • 956 posts
  • LocationShasta County in the real Northern Kalifornia

Posted 09 May 2016 - 01:05 AM

I second that suggestion! Good call Crazygamer.

#4 baddboybill

baddboybill
  • Boomus Fidelis
  • 10,658 posts
  • LocationIn the middle of nowhere!!

Posted 09 May 2016 - 08:57 PM

Plus clean all pots and switches with deoxit


Bad Boy Bill

#5 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 10 May 2016 - 06:05 AM

Wow! Thank you all for your great advices :) unfortunately in electronic class, we didn't get the tape deck course as it is obselete technology but i go ahead and get all the experience i can. I will let you know how things are going, today is paint day for the clairtone bad boy :)

#6 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 10 May 2016 - 01:55 PM

I have finished painting the cover, here is what's happenning now with the radio itself. On every mode except radio (and even there it does it a bit) the right channel VU meter vibrates around level 0 and there is practicly no audible sound. If you crank the rafio past 11 you'll hear thumping like an helicopter sound. I am currently in the bus going to get both deoxit and MG contact cleaner. Also will grab bags of caps to recap the unit. The thumping noise however can be stopped by pressing the Edit button, but that will disable my VU meter.. Boy, what a machine..

#7 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 11 May 2016 - 12:16 AM

Well contact cleaner fixed every thing :) i wish to thank all of you who helped this post! I will continue repairs on cleaning / adjusting the tape heads, fix my broken door and install LEDs.

#8 baddboybill

baddboybill
  • Boomus Fidelis
  • 10,658 posts
  • LocationIn the middle of nowhere!!

Posted 11 May 2016 - 12:36 AM

👍now ya gotta post some pics 😎


Bad Boy Bill

#9 caution

caution
  • Members
  • 1,391 posts
  • LocationHillsboro, Oregon

Posted 11 May 2016 - 12:09 PM

Well contact cleaner fixed every thing :) i wish to thank all of you who helped this post! I will continue repairs on cleaning / adjusting the tape heads, fix my broken door and install LEDs.

 

Please post pictures of your project, we all want to see what you're doing!



#10 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 11 May 2016 - 06:29 PM

This is how she looks for now. I chose a dark gray color to do the back panel, with scotch tape over the labels to protect them At this very minute i'm writing this, I have repaired the Tape Run carbon traces PCB!! :D with a bottle of nickel conductive paste (it was the only product available at the store for the moment) I am so damn PROUD of how the restoration of this box is going :) Next steps will be to fix the spare tape tray plastic finger, install the LEDs for the dial, and fix the tape door hinge. In the future i might plan to replace the woofers with clear cone ones to add LEDs lightong behind them (after watching some Conion C 100 mods on youtube)

Attached Files



#11 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 11 May 2016 - 11:45 PM

never mind... the tape run pcb has failed, i will either retry with the stupid pain in the ass paste or dremel from a virgin copper pcb board. What are your best solution to DIY "from the garage" a PCB??



#12 caution

caution
  • Members
  • 1,391 posts
  • LocationHillsboro, Oregon

Posted 12 May 2016 - 12:46 AM

Someone here might have an original, that part doesn't usually go bad.

You might want to ask about it in the wanted section



#13 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 12 May 2016 - 03:36 AM

I cannot really afford a part like that. Unless its cheap like 20$ or under i'll have to find another way.. But i will post to check. Thank you mister caution!!

#14 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 12 May 2016 - 07:53 AM

Ohhhh this is just fantastic! The original plastic hinge finger was broken, i managed to machine a new metal part that looks like it, not only the door fits perfectly, but in a wild shot it also sits confortably on the brake wheel! It is centered vertically, and gives free space horizontally of few milimeters, WOW, i am amazed... Thats a good way to start the day!

Attached Files



#15 caution

caution
  • Members
  • 1,391 posts
  • LocationHillsboro, Oregon

Posted 12 May 2016 - 10:08 AM

Nice work! This is a tricky pin to get right since it's mostly round, but the top and bottom have flattened surfaces to allow the tape door hinge to slide onto the pin before it can turn freely. I had to replace one also, I crafted a new one out of plastic in the same shape, and welded it on with solvent, but yours looks even more durable than that.



#16 MyOhMy

MyOhMy
  • Members
  • 1,883 posts
  • LocationSleaford, Lincolnshire, UK.

Posted 12 May 2016 - 10:29 AM

Ohhhh this is just fantastic! The original plastic hinge finger was broken, i managed to machine a new metal part that looks like it, not only the door fits perfectly, but in a wild shot it also sits confortably on the brake wheel! It is centered vertically, and gives free space horizontally of few milimeters, WOW, i am amazed... Thats a good way to start the day!

 

Well done indeed! :thumbsup:  :rock:



#17 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 12 May 2016 - 10:58 AM

Caution, its an old trick of mine, metal part, soldering gun, platic,... ;) place the piece where you want, heat it, you'll see plastic melting, be quick though, or, you'll end up misaligned. I am few mm misaligned and the door is few mm out in depth but it is well not enough to affect the tape. And finish the part with krazy glue after heating it ;) you're done!

#18 BoomboxLover48

BoomboxLover48
  • Boomus Fidelis
  • 4,801 posts
  • LocationChicago, IL

Posted 12 May 2016 - 11:15 AM

Caution, its an old trick of mine, metal part, soldering gun, platic,... ;) place the piece where you want, heat it, you'll see plastic melting, be quick though, or, you'll end up misaligned. I am few mm misaligned and the door is few mm out in depth but it is well not enough to affect the tape. And finish the part with krazy glue after heating it ;) you're done!

It works, but it is better to make a hole with a drill bit and then glue it together.



#19 caution

caution
  • Members
  • 1,391 posts
  • LocationHillsboro, Oregon

Posted 12 May 2016 - 12:00 PM

Looks pretty good! Just some advice though... if you get into fixing more things - Krazy Glue will break down and crumble apart after a few years, it's not good for permanence. I wouldn't recommend using glues or epoxies to repair plastic. You were right to melt the plastic, but if possible, use a bonding solvent.  It doesn't use heat, and is much less invasive to the original surfaces. It's great for fixing cracks and replacing fallen-off pieces. One tiny drop can be all it takes, it evaporates very quickly and makes a bond stronger than any glue can. Here's an example product, although there are many of them.



#20 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 13 May 2016 - 01:48 PM

Really?! I sure will keep an eye for that :) i just came back from the electronic store, bought a virgin copper board to remake a new PCB and use copper plates instead of carbon traces to light up the Tape Run LEDs

#21 caution

caution
  • Members
  • 1,391 posts
  • LocationHillsboro, Oregon

Posted 13 May 2016 - 06:59 PM

Are you Karl? I think I gave you my wiring diagram.



#22 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 13 May 2016 - 11:18 PM

haha yes that is me :)



#23 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 14 May 2016 - 03:05 AM

There it is! Hard to be good with shiatty dremel bits... Tomorrow testing time, now sleep .. :)

 

Attached Files



#24 caution

caution
  • Members
  • 1,391 posts
  • LocationHillsboro, Oregon

Posted 14 May 2016 - 04:23 PM

Nice work! That should last forever.



#25 caution

caution
  • Members
  • 1,391 posts
  • LocationHillsboro, Oregon

Posted 14 May 2016 - 04:26 PM

Nice job! You still might be able to salvage the original board if you cut out some pieces from aluminum or copper tape, in the shape of those worn out pads.



#26 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 14 May 2016 - 07:22 PM

I thought about that too! But the copper traces the store have are a tad too large (to my eyes). I still have enough PCB for two or three boards in case it doesnt work :P

#27 baddboybill

baddboybill
  • Boomus Fidelis
  • 10,658 posts
  • LocationIn the middle of nowhere!!

Posted 14 May 2016 - 10:13 PM

Might be easier using acid 🤔. That's how we use to make boards in electronics back in da 80's 😉


Bad Boy Bill

#28 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 15 May 2016 - 01:21 PM

i'm running very tight on budget for now, and chemicals cost pretty much hehe so i'm doing this very basically ;)



#29 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 16 May 2016 - 02:28 AM

wow... i have discovered a LED of the taape run is not working and blocks current path for one of the two leds sets... another show stopper.... any info on the LEDs could help a lot, thank you :)



#30 Proutpouel

Proutpouel
  • Members
  • 16 posts

Posted 16 May 2016 - 11:05 AM

ok, good thing, i salvaged the record light since it has about the same dimensions for my broken tape run LED, i believe when i was doing my tests with the LED i think i heard one crack (possibly for having bad voltages to it ) so putting and dremeling the record light, i have found a square red LED from a garbage tape deck to fit in the recording spot... will keep updated





Also tagged with one or more of these keywords: Cassette, Tape, Deck, Play, Repair, Noise, Problem, Conion, Clairtone, 7980