National RX5700 music search repair!!!

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baddboybill

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Jul 14, 2009
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So I've been trying to figure out the TPS on my National. Thanks to Norm pointing me in the right direction that the music search buttons have a mechanical locking mechanism and not an electronic one.

So after stripping the whole TPS down including having to take all 11 switches apart to get to locks which were jammed.

I finally got them unjammed...cleaned and greased everything, plus had to add extra spring because original was worn :-)

Well it's all back together and working great. Every so often the clear button sticks a bit but works :thumbsup:










https://www.youtube.com/watch?v=kaTZdUfY ... ata_player


Bad Boy Bill
 

JVC Floyd

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impressive work that looks complicated , i would lose half the parts in the first 5 minutes that would be a spray and pray only job for me :-D

those older boxes were really built well :drool:
 

baddboybill

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Thanks guys :thumbsup: Royce this was not an easy job. Took me about 8 hrs to complete. Lots of small parts :-(. If you need help let me know. Oh!! and a second set of hands helps ;-)

Because the worn spring was so tiny and literally buried, plus I would never have found such a tiny A$$ spring. I added a spring. Had to be right tension too. To tight... and clear button wouldn't work. To loose... and locking buttons wouldn't work. Took me a bit to get right tension. Today I used a small piece of aluminum to hold spring perfectly in place. Now even the clear button isn't getting hung up :-). Here's a pic of spring with bracket!!!




Bad Boy Bill
 

baddboybill

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Superduper said:
Glad you got it fixed Bill. I know you didn't believe me at first when I told you, but if you had trusted me, it wouldn't have taken 20 PM's to figure out. :lol: :-D :dunce:
:lol: Thanks again Norm :thumbsup: the mechanism was definitely buried very good :woot:


Bad Boy Bill
 

baddboybill

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Reli said:
Awesome, mechanical music search, who would have thought?
Well the actual music search is electronic but the switches are mechanical with a spring loaded lock, similar to the M90 band switches ;-)


Bad Boy Bill
 
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