M70 A1 at last! :)

[Northerner]

Well it took over a year and several failed attempts to get the replacement part but at last my M70 is A1!

When Alberto posted that he was splitting an M70 I was super quick off the mark and dibs'ed a volume slider. He was great to deal with, shipped it fast and packed it in a box several hundred times bigger than the part

Well this afternoon I opened up the M70, took out the old volume pot and soldered in the new one. I switched her on and BOOM!...both channels are now the same!...sooo chuffed!

This vid shows how imbalanced the channels were before
http://m.youtube.com/watch?v=LwNEfVBSW6U&feature=c4-feed-u

And here's the repaired version
http://m.youtube.com/watch?v=obIJjAn9M4w&feature=c4-feed-u

 

[Beosystem10]

Hell yeah! Every day that passes without an M70 in my life is a day that makes me feel less like I belong on this JVC M70 owners' club forum but some day, mark my words, I'll have one and if it's as tidy as yours then I'll be happy. Well done.

 

[BoomboxLover48]

I know the feeling! I've fixed two of my M70s already. When a weak channel comes alive and really pumps, both VUs dance at the same strength.........it is such a good feeling.

 

[blu_fuz]

Hell yeah!

 

[Cpl-Chronic]

Congrats Northerner. The RGB kit is perfect for a 'norm' type LED mockup. You can have it look exactly like norm's kit but with 16 different colors & it costs the same & is remote controlled too. Highly recommended but you need to do some fabbing but I know you got the skills man...

Cheers,
Cpl

 

[sammyriver]

good work dude !!

 

[baddboybill]

Great job


Bad Boy Bill

 

[Northerner]

Hell yeah! Every day that passes without an M70 in my life is a day that makes me feel less like I belong on this JVC M70 owners' club forum but some day, mark my words, I'll have one and if it's as tidy as yours then I'll be happy. Well done.

Well you never know John...I was lucky enough to be offered this one some time ago by a forum member at a very cheap price. It was his second one he bought just to take an intact tape deck door from, he'd got it cheap as it only worked on one channel...he's been using it in his shed! Well I was just really pleased to get one and at a great price so I wasn't worried about its faults. Did my usual clean and repaint of woofers/grills then started searching...in the meantime the duff channel slider was fixed with some conductive silver paint. Got a deck door from Bredgeo in France and a long time later the volume slider from Alberto...I would never have given up getting it spot on. Even with repairs and spare parts its still a very low cost M70. So keep your fingers crossed John I'm sure one will turn up for you, they really are worth the wait/effort

 

[Northerner]

Congrats Northerner. The RGB kit is perfect for a 'norm' type LED mockup. You can have it look exactly like norm's kit but with 16 different colors & it costs the same & is remote controlled too. Highly recommended but you need to do some fabbing but I know you got the skills man...

Cheers,
Cpl

Thanks CPL but i just couldn't bring myself to mod my M70...might get a norm kit now that its A1 but nothing more, its in way too good condition. I'm not as daring as you mate

 

[Northerner]

Thanks for the positive comments fellas

 

[Beosystem10]

Well, if you ever fancy swapping yours for a working Technics SA-C05L that I've owned and loved since it was new in December, 1982......

Thought not! But a boy has to ask.

 

[Northerner]

Lol...wouldn't swap it for anything mate...you know how sometimes you're really attached to a box and then with others you're not that fussed even if its a good box. Well this one I'm very attached to as it was cheap, dirty, had a cracked deck door, and only worked on one channel when I got it and its been a lot of effort to get it to this stage. It wears its blu-fuz strap with pride now

 

[superlew]

Nice work. Completing a repair like that is such a great feeling!
Did you ever figure out the issue with the original slider? Could be a great trade part if you can fix it. Since it's no longer installed, it's a good opportunity to open it up and check it out - even just to gain some knowledge and experience. But remember, you really only get one chance for disassembly/reassembly.

 

[Northerner]

The slider I took out had a break in the slide so had already been repaired with some silver conductive paint. But even tho the paint was applied sparingly and did make it work it reduced the resistance from 56k to 45k...hence the imbalance. I'll keep it because its still usable just not perfect...someone might need it

 

[Northerner]

The slider I took out had a break in the slide so had already been repaired with some silver conductive paint. But even tho the paint was applied sparingly and did make it work it reduced the resistance from 56k to 45k...hence the imbalance. I'll keep it because its still usable just not perfect...someone might need it

 

[Beosystem10]

Surely turning the volume up beyond the break in the track would have evened things out though? If nothing else, it would've been a grand excuse to make some noise.

I had a similar break in the track on my long-suffering GF-555s treble control, a little graphite powder/glue mixture applied once the crack had been gouged out and its edges made stable did the job electronically but there is an extra detent caused by the repair. If anyone asks, I just tell them that Sharp kindly provided indexing at 3/4 as well as at 1/2!

 

[superlew]

The slider I took out had a break in the slide so had already been repaired with some silver conductive paint. But even tho the paint was applied sparingly and did make it work it reduced the resistance from 56k to 45k...hence the imbalance. I'll keep it because its still usable just not perfect...someone might need it

Got it. I wasn't sure if you had gone the "disassembly" route before swapping out.

 

[Cpl-Chronic]

Thanks CPL but i just couldn't bring myself to mod my M70...might get a norm kit now that its A1 but nothing more, its in way too good condition. I'm not as daring as you mate

That's cool. I'm gonna have an M70C version soon & will show you what I mean. This unit is minty & 47w so the RGB's are the last step for me.

Cheers,
Cpl