Magnavox 7140 - bad switch - fix or replace?

[SteveH]

hi folks
Was gifted a '77 Magnavox 7140 - AM/FM cassette. The AM/FM work as well as one could expect.
The cassette - well, there's the problem. Disassembled, switch to "Tape" and engage the play button.
The motor turns for a half second, but nothing thereafter.

I found that if I nudge the Tape/AM/FM switch ever so slightly toward the AM (from the Tape position),
the tape will play. So, I'm considering how to repair.

I've not found a parts list, and have little hope of finding a replacement switch, so I'm thinking "repair".
Just to be clear, I've given the switch a thorough de-oxit, but I still need the slight nudge to keep the tape
playing.

TIA
Steve

 

[caution]

Some switches become so contaminated that spraying Deoxit isn't a permanent solution and must be disassembled for a proper clean.

 

[SteveH]

thanks caution. I've removed the switch, disassembled, cleaned and poised to reinstall. It might just work!

 

[SteveH]

unfortunately cleaning and reassembling didn't fix. the little sliders inside the switch (3 position) don't compress and make contact with the blades.

 

[SteveH]

Astonished to find that this is a somewhat standard 6 pole 3 position 24 pin slider switch.
I found them here:

This product is no longer available.

This product is no longer available.

www.alibaba.com

But I don't really need 500 of them. Sigh.

 

[SteveH]

ah. found 'em.

2.55US $ |10pcs Ss-63d05 6p3t-g8 Six Pole Three Throw 3 Position Slide Switch 24 Pin Dip Type With 4 Fixed Pin Handle Heights - Switches - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

 

[SteveH]

alas. switches arrived. same issue. Now searching for the schematics for this little beastie.

 

[caution]

There's a link to download it as a PDF on this page (link)

 

[Superduper]

alas. switches arrived. same issue........

Same issue, as in switch requires nudging in order for tape to work? If so, you may want to consider whether the PCB has a fracture or cold solder joint where connection is restored when pressure is put on the pcb. To confirm, just leave switch in the tape position and press around the pcb in that near vicinity, or even the switch body.