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Help Identifying a replacement Tone Defeat Switch

xrayspex77

Super Member
May have finally tracked down my extra 8VDC to the Speaker Terminals and random DC spikes (Luxman LV-102) to the Tone Defeat Switch. It may not be the cause, but everything seems to be routed through it and it will no longer latch/unlatch so needs to be replaced anyway. I did a search for the part # in the SM
but the only reference I found was to the SM for the LV-102. I've been looking at Digikey (40% cheaper shipping to Canada) but I am overwhelmed by the variables, what's a mom switch?
I don't know if it is, or should be, a power switch.
It is an Alps Latching push button with no part # on it. Tones are "On" when latched and "Off" when unlatched. It is mounted right angle on the Tone PCB and has 12 pins. I've attached a photo that may help
thanks
 

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Wow, that thing also removes the INPUT from the tone amp, presumably to improve noise and distortion characteristics by a very minute amount. They do pay attention to detail huh. A six pin switch would do it, but that contraption is configured like nothing I've ever seen.

You can hardwire it if necessary, temporarily, but I am pretty sure that it is not the cause of DC on the output. Do you have the offset on both channels ? If so it is probably in the power supply. Hope so, because that amp looks a little hairy to work on.
 
Ya turns out it is not anything like a standard switch. No part # anywhere so I can't even find a counterfeit. When it was last "working" and Tones were off, I was getting 8VDC L and about 3VDC R. I had taken readings on the IC's in the Rectifier circuit and never saw a spike there, but the switch jamming stopped me from testing them again with what I know now.
If I can find out what pins to jump, I'll try it just to see what happens.
 
Opened the switch to see if I could unjam it but everything fell out, opened it over a white piece of paper though, so I have all the parts. One of the jumpers in the switch was bent so that was part of the problem. I shorted the Tone Controls on the PCB and the spikes seem to be gone but I'm getting wrong voltage readings on the Tone Amp IC NJM4558. The Flat Amp IC is almost impossible to get at which leads to my next question if a search doesn't find an answer.
 
Sorry to respond to such an old topic but that switch is impossible to get anymore... my Harman Kardon HK6600 has exactly the same 12 pin push switch and the only thing close I could find is a 6 pin which obviously won´t work in this application. I just decided to hardwire it. I also opened it and it exploded in my face impossible to get it back together... LOL
 
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