I had this beautiful Panasonic RX5700 and didn't know it got a problem with TPS till Bad Boy Bill started working on fixing his. I never used the TPS and didn't like it very much because of the wear it causes on the tape head and the tapes.
After seeing what Bill did I was kind of worried about the oxidation in my unit on the contacts in the switch assembly. I decided to open it up and fix the problem I also had with TPS.
It took me almost a whole Saturday to fix it and put all back together. I must say the whole switch assembly is such a horrible
design. When you press the clear switch it has to unlock any of the switches that are engaged in the array. Okay, it does that but the return spring is so small, 
it won't bring it back to normal. The little tiny spring gets stuck and there is no room to put a better/stronger spring at all.
I was able to meticulously clean all the oxidized contacts, lube the assembly and put it all back together.
I thought I can do it in less than 2 hours at the most. No way!
I was so stupid!
Bill, thanks for the motivation! Thanks to Superduper for telling us it is a self-locking type of switch assembly.
Please see the pics attached.
The TPS Board
Another view of the TPS board
Swich in locked position
Lots of parts and so easy to lose the springs. I had a magnet for the springs. Those goys will fly away when you try to hold them.
One nasty guy jumped off from my hands and I was on my knees for almost 30 minutes to find him.. 
All soldered back to the PC board
One Happy Panny ...back in good shape
After seeing what Bill did I was kind of worried about the oxidation in my unit on the contacts in the switch assembly. I decided to open it up and fix the problem I also had with TPS.
It took me almost a whole Saturday to fix it and put all back together. I must say the whole switch assembly is such a horrible
design. When you press the clear switch it has to unlock any of the switches that are engaged in the array. Okay, it does that but the return spring is so small, it won't bring it back to normal. The little tiny spring gets stuck and there is no room to put a better/stronger spring at all. I was able to meticulously clean all the oxidized contacts, lube the assembly and put it all back together.
I thought I can do it in less than 2 hours at the most. No way!
I was so stupid!
Bill, thanks for the motivation!
Thanks to Superduper for telling us it is a self-locking type of switch assembly. Please see the pics attached.
The TPS Board
Another view of the TPS board
Swich in locked position
Lots of parts and so easy to lose the springs. I had a magnet for the springs. Those goys will fly away when you try to hold them.
One nasty guy jumped off from my hands and I was on my knees for almost 30 minutes to find him..
All soldered back to the PC board
One Happy Panny ...back in good shape
glad you got it back together. Took me about 6 hours to complete.. But I was able to put an external spring on mine which does a great job in return of clear switch. It even looks professional 
I tried the TPS on my National Panasonic yesterday, and to my surprise it worked! 
I could never!
