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You ever drill a hole with a needle?


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#1 blu_fuz

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Posted 13 May 2015 - 07:24 PM

I did.......


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#2 redbenjoe

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Posted 13 May 2015 - 08:57 PM

joe --industrial supply outfits sell drill bits of ANY tiny size --you could prolly order a .010 "-

even with a taper !



#3 blu_fuz

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Posted 13 May 2015 - 09:11 PM

Didn't need to, the needle worked perfect ;-). But thanks for the tip.

#4 Lasonic TRC-920

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Posted 13 May 2015 - 09:25 PM

IMPROVISATION is the "Key" to Boombox maintenance, repair and innovation!  :thumbsup:

 

however, I use tiny drill bits  :-P



#5 blu_fuz

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Posted 13 May 2015 - 09:26 PM

I will probably buy a set of micro bits and screws for repairs like this.


A needle is all I had hahahaha

#6 -GZ-

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Posted 13 May 2015 - 10:16 PM

What box is that knob from? A low end panny? I really have no clue....but I must know!

#7 blu_fuz

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Posted 13 May 2015 - 10:38 PM

JVC RC-M90 volume pot. No replacement, so it must be fixed, whatever it takes. I probably could have just glued them but wanted something that felt more like a permanent repair.

One of the metal feeler plates was broke off and the other just hanging on.

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Fixed:
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Sealed with RTV:
Attached File  image.jpg   69.39K   64 downloads

#8 duckman

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Posted 13 May 2015 - 10:48 PM

I

A needle is all I had hahahaha

Ahh, necessity, the mother of invention!  I've used a finishing nail on many occasion

 Gotta ask tho, isn't it a tad offset to spin tight?



#9 Lasonic TRC-920

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Posted 14 May 2015 - 12:28 AM

Dude, fantastic repair work  :yes:

 

When you have to dig deep, you have to dig deep!

 

You weren't doing repairs like this at count 125  :sadno:



#10 stereomad

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Posted 14 May 2015 - 12:32 AM

Good work blu

#11 mancardo

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Posted 14 May 2015 - 12:56 AM

I did.......


attachicon.gifimage.jpgattachicon.gifimage.jpg

Very nice idea.



#12 blu_fuz

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Posted 14 May 2015 - 07:33 AM

Ahh, necessity, the mother of invention!  I've used a finishing nail on many occasion

 Gotta ask tho, isn't it a tad offset to spin tight?

 

 

I too have used a finishing nail to drill a hole. I worked in the construction trades for years and that trick came in handy when hand finish nailing some projects together.

 

 

Yes, the needle was a tad offset because it was so small I needed to clamp it in the drill chuck with a real drill bit. There was enough flex in the needle once you got it up to speed it evened out well enough to drill a straight hole.



#13 caution

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Posted 14 May 2015 - 09:37 AM

You made me cringe, therefore it was a righteous hack :-)



#14 blu_fuz

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Posted 14 May 2015 - 09:40 AM

Hell yeah!



#15 -GZ-

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Posted 14 May 2015 - 10:10 AM

JVC RC-M90 volume pot. No replacement, so it must be fixed, whatever it takes. I probably could have just glued them but wanted something that felt more like a permanent repair.
One of the metal feeler plates was broke off and the other just hanging on.
attachicon.gifimage.jpg
Fixed:
attachicon.gifimage.jpg
Sealed with RTV:
attachicon.gifimage.jpg

Ya know that was my first thought but the spacing of the grooves on the side of the knob looked a little wide to be an m90. Maybe because the pic was zoomed in so close.

#16 SLO

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Posted 14 May 2015 - 10:21 AM

Great work man  :thumbsup:



#17 blu_fuz

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Posted 14 May 2015 - 10:22 AM

The knob I use to hold the potentiometer isn't the original from the M90, but it is pretty close that's why you might have thought it was. I didn't want the needle to stab me in the finger after it went though the plastic.



#18 k2j

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Posted 14 May 2015 - 11:47 AM

dayamn.  Nice job!!



#19 Lasonic TRC-920

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Posted 14 May 2015 - 01:25 PM

Was the operation a success?



#20 AE_Stereo

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Posted 14 May 2015 - 02:17 PM

Master craft!



#21 blu_fuz

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Posted 14 May 2015 - 02:27 PM

So far, I was only able to do the work and make sure the feelers line up on the pot board correctly. I do believe it is going to be 100% functional.

 

 

Matter of fact, this is a COMMON problem for JVC M90 potentiometers. The melted plastic buttons that hold the feelers on eventually break off. Could be an age, use, or abuse issue.

 

We have been discussing behind the scenes that these M90 pots should be opened up now and reinforced with a small screw in the center hole of each feeler plate. Probably add a dab of epoxy to the existing plastic buttons and these should last a lifetime.

 

Some of us might already have a damaged pot and not know it.

 

 

Mine was acting strange.

 

From 0 to about 3/8 volume mine sounded OK but a little flat like if the loudness was off.

Then from 3/8 to about 1/2 volume there was scratchy left speaker only and right speaker didn't work at all unless you fiddled with the knob shaft.

Then from 1/2 volume and up it was nice and clear out both channels and as if the loudness was working again.

 

The knob rotation also didn't have the soft tension on it like my other M90 volume knob had.



#22 Lasonic TRC-920

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Posted 14 May 2015 - 09:56 PM

So basically it was worn out in the "Typical Use" section of the knob position. Makes sense.

 

This is important information for ALL M90 owners! (i'm not one  :sad: )



#23 JustCruisin

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Posted 14 May 2015 - 10:16 PM

I'm reaching far into my memory banks on this...But, wasnt the word on the streets that M90 shares its volume pots with Panasonic 5050..? :hmmm:

#24 blu_fuz

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Posted 14 May 2015 - 10:20 PM

Close

You lose balance control, loudness, and the D shaft is rotated different so the M90 knob will never point to the correct volume setting. But, a panny 5050 pot is better than nothing!

#25 blu_fuz

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Posted 15 May 2015 - 08:03 AM

I guess I should have posted this in the JVC M90 section.


I dabbed a little white lithium grease on to the base of the shaft where it enters the metal casing. That is to restore the soft turn motion that it originally felt like. Got it closed back up. The motion feels almost as good as my othe M90.


Hopefully it all works after the box is back together.

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#26 BoomboxLover48

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Posted 16 May 2015 - 06:57 PM

Joe,

 

I've done crazy things like this but not anymore...

Needle on a drill??

 

Oh my!

 

That is DANGEROUSSSSSSSSSS! :nonono:  :nonono:



#27 blu_fuz

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Posted 28 May 2015 - 09:21 AM

The repair worked PERFECT. 100% restored sound and fixed to last. Very happy right now :w00t:  :clap:  :rock:  :thumbsup:



#28 baddboybill

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Posted 30 May 2015 - 03:01 PM

Great job Joe using the old knocker ;-)


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#29 JVC Floyd

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Posted 30 May 2015 - 04:07 PM

your new jedi name is " blu-per duper"  , may the force be with you .



#30 Lasonic TRC-920

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Posted 31 May 2015 - 10:47 AM

The repair worked PERFECT. 100% restored sound and fixed to last. Very happy right now :w00t:  :clap:  :rock:  :thumbsup:

 

Great work Joe, really going where no one has gone before!