A Hair Pulling M90 Restoration!

[baddboybill]

This is Aron's M90 which he just recently got back from Don. I've restored her the best that I can but had no luck with deck board because part of corner melted due to overheated fusible resistor. Aron in now in need of replacement deck board if anyone has a good one

As far as what I did accomplish I think results will show in pics. Radio and line in work excellent and it looks like a beautiful unit again Here are some before and after pics























Bad Boy Bill

 

[baddboybill]

And wallah the end result






Bad Boy Bill

 

[baddboybill]

Second pic is showing glue that dripped down tuner window glass. I tried oil to soften glue with no luck as it seemed to be super type glue. So I ended up wet sanding with very very fine sandpaper and buffing window out. Results were excellent


Bad Boy Bill

 

[Ken]

Any possibility of jumpering the melted traces, Bill? I'm assuming that they melted due to proximity, not what they were forced to carry, of course.

 

[baddboybill]

Any possibility of jumpering the melted traces, Bill? I'm assuming that they melted due to proximity, not what they were forced to carry, of course.


When I first got unit some wires were not even hooked up on deck

Then I tried with no luck, It's so tight of area and I don't want to chance it anymore because when I did a test after trying to jump them the deck worked but went very slow then while I was trying to adjust motor a puff of smoke came off preamp board. So I'm not sure what's going on but I'm not moving ahead with this deck board. I did manage to replace preamp board with one I had. I believe a fusible resistor went on board (FR501) but when I looked up on scheme I could not even find the resistor. But I'm just happy the rest of unit is working


Bad Boy Bill

 

[Ken]

Enough is enough, I guess. If things aren't showing up on the schematic, time to call a halt and send for re-enforcements. I would guess that a deck board is gonna be hard to find.

Smoke is not good.

 

[blu_fuz]

It does look better.


I do like the look of original speakers and not too-blue of ones. Looks classy and clean.

 

[baddboybill]

Enough is enough, I guess. If things aren't showing up on the schematic, time to call a halt and send for re-enforcements. I would guess that a deck board is gonna be hard to find.

Smoke is not good.


Could be there I just couldn't find either of the fusible resistors on preamp board scheme smoke is definitely not good and thank God I had extra board. Only had to transfer a few components from Aron's original board to make complete. You are so right that finding a deck or even deck board will be hard


Bad Boy Bill

 

[baddboybill]

It does look better.


I do like the look of original speakers and not too-blue of ones. Looks classy and clean.


Yeah these speakers were much easier to clean up from last set I restored


Bad Boy Bill

 

[AE_Stereo]

You are a daredevil.
An M90 dismantled so effortlessly!
Well done and inspiration for others!

 

[autobot84]

looks great bill. i can live without the tape deck. might be years before i find a deck board and then that might be toast as well. at least line in and radio work

 

[JustCruisin]

have not a clue who these people are who you are speaking of...?
member A got boombox from member B...member C played with the box for a while then screwed it back together...

 

[baddboybill]

have not a clue who these people are who you are speaking of...?
member A got boombox from member B...member C played with the box for a while then screwed it back together...


Don AKA Masterblaster84 and Aron AKA autobot84


Bad Boy Bill

 

[blu_fuz]

when I did a test after trying to jump them the deck worked but went very slow then while I was trying to adjust motor a puff of smoke came off preamp board. But I'm just happy the rest of unit is working


Bad Boy Bill

Whoa what? So do you need to find him a new board for frying his? Or????

 

[baddboybill]

Whoa what? So do you need to find him a new board for frying his? Or????


Just a deck board because traces were burned already previously but I might have one on way. Radio and line in work perfect.


Bad Bad Bill

 

[Superduper]

If it's cheap, I'll buy the toasted preamp board.

 

[MasterBlaster84]

Awesome work Bill, if you didn't say so I probably wouldn't think it's the same box.
I find it really cool that it's going back to the Aron after so many years, for those that don't know this was my first M90 that I bought from Aron about 6 or 7 years ago.

 

[baddboybill]

Awesome work Bill, if you didn't say so I probably wouldn't think it's the same box.
I find it really cool that it's going back to the Aron after so many years, for those that don't know this was my first M90 that I bought from Aron about 6 or 7 years ago.


Thanks Don besides the deck board issues it came out pretty nice


Bad Boy Bill

 

[baddboybill]

I did one last try on getting the traces where they needed to go but with such a tiny area and my poor eye sight bad non steady hands I was unsuccessful. the little piece is part of trace that came off.

Bad Boy Bill

 

[Superduper]

The "proper" way to repair PCB traces is to use the proper materials for the repair. They aren't cheap, and the only one that comes to mind is Cir-Kit by Pace. Like this:

http://www.stanleysupplyservices.com/pace-6993-0082-master-cir-kitr-repair-kit-for-pcbs/p/127-655

The kit includes traces, curves, and eyelets, as well as the proper heat activated adhesive.