Jump to content



Photo

rebuilding a slider on M70


  • Please log in to reply
13 replies to this topic

#1 dan

dan
  • Members (SA)
  • 64 posts

Posted 09 April 2019 - 02:47 PM

i am going to be rebuilding the bass slider on my M70 when i take it apart again.  i found a copper "feeler" loose in the bass slider and took it out with a pair of tweezers and put it aside.

 

what kind of adhesive should i use to glue the copper feeler back in place to the plastic?

 

 

also, with that feeler out,  what does the bass level default at? -8, 0 or 8 ?



#2 caution

caution
  • Members (SA)
  • 1,959 posts
  • LocationHillsboro, Oregon

Posted 09 April 2019 - 02:50 PM

JB PlasticWeld

0



#3 dan

dan
  • Members (SA)
  • 64 posts

Posted 09 April 2019 - 03:03 PM

JB PlasticWeld

0

 

 

this stuff?

 

https://www.amazon.c...=gateway&sr=8-2

 

 

 

i already have some  "Elmer's Super Fast Epoxy Cement" 

https://www.amazon.c...sr=8-1-fkmrnull

 

is the elmer's any good?



#4 Fatdog

Fatdog
  • Administrators
  • 10,806 posts
  • LocationMiddle Tennessee, U.S.A.

Posted 09 April 2019 - 05:05 PM

I personally haven't used the Elmer's brand stuff.  The JB PlasticWeld has a tensile strength of 3,200PSI when fully set - so, it's dang tough.  Do you really need 3,200PSI tensile strength?  More than likely, no.  If you have used the Elmer's before and know its strength, it might work just as well.



#5 Superduper

Superduper
  • Boomus Fidelis
  • 6,869 posts
  • LocationSomewhere over the rainbow, USA

Posted 09 April 2019 - 07:44 PM

Make sure whatever you use will adhere to nylon, which is what that white block is made of. Any more questions, you should probably search the archives, The M70 slider rebuilding has been covered many times already.

#6 dan

dan
  • Members (SA)
  • 64 posts

Posted 22 April 2019 - 04:09 AM

Should be getting my plastic weld in the mail in a couple of days to attempt this repair. Out of curiosity, does the bass fader have one or two of these?

Attached Files



#7 Superduper

Superduper
  • Boomus Fidelis
  • 6,869 posts
  • LocationSomewhere over the rainbow, USA

Posted 22 April 2019 - 09:55 AM

2

#8 dan

dan
  • Members (SA)
  • 64 posts

Posted 22 April 2019 - 05:28 PM

2

would you still be able to hear both channels with one feeler removed? i ask because i wonder if the box was ever repaired and somebody and they put a fixed resistor somewhere.



#9 Superduper

Superduper
  • Boomus Fidelis
  • 6,869 posts
  • LocationSomewhere over the rainbow, USA

Posted 22 April 2019 - 10:13 PM

There's a ton of material on this subject if you search the archives.  I know, I put a lot of it there, and trust me, we don't really like typing the same stuff over and over again.  Failed slide controls on the M70 are a common problem.

 

As to your specific question, even if there were no feelers on the bass control, the signal will still find it's way to the volume control, but not through the normal path so the sound just won't be right.  The RC-838 is a different story.



#10 dan

dan
  • Members (SA)
  • 64 posts

Posted 16 May 2019 - 08:41 PM

Attached File  20190425_194547.jpg   56.53K   8 downloadsAttached File  20190425_195556.jpg   66.11K   9 downloadsAttached File  20190425_200710.jpg   121.62K   4 downloads

#11 Fatdog

Fatdog
  • Administrators
  • 10,806 posts
  • LocationMiddle Tennessee, U.S.A.

Posted 16 May 2019 - 09:51 PM

Those feelers look exceptionally shiny now.  :cool:



#12 Transistorized

Transistorized
  • Members (SA)
  • 1,611 posts
  • LocationUSA

Posted 17 May 2019 - 09:52 PM

Those feelers are a lot tinier than I thought they'd be.

 

^^^said that out loud^^^ Wife's expression was  :blink:  :huh:



#13 Lasonic TRC-920

Lasonic TRC-920
  • Moderators
  • 14,079 posts
  • LocationNaples, Italy

Posted 18 May 2019 - 05:51 AM

Should be getting my plastic weld in the mail in a couple of days to attempt this repair. Out of curiosity, does the bass fader have one or two of these?

 

Damn, I need to get my glasses updated  :lol:



#14 hopey

hopey
  • Members (SA)
  • 398 posts
  • LocationMelb AU

Posted 19 May 2019 - 06:37 PM

Nice work dan!