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A Look Inside the Panasonic RX-6400 (A2)

Panasonic National RX-6400 RX-A2

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#1 superlew

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Posted 28 November 2013 - 05:56 AM

Sorry guys - no pretty "ooh-aah" pictures here. :no:

 

I wanted to post this just to give everyone an idea as to what's going on inside this behemoth. It's not mine - I'm repairing it for a friend and fellow member. I wanted to know what I'd be in for if I took the project on, but I couldn't find anything other than nice pics of complete units. That's why I'm posting this.

 

I would not recomend digging too deep into this thing without the service manual, since it's pretty much "visual chaos" once it's removed from the back case. It had several issues, including noise, an unreliable left channel, static everywhere, erratic VU's, a sticky source attenuator slider, and a few other odds and ends, not to mention the tuner which is a whole other issue.

 

I stripped it down to the sheet metal (yes, sheet metal). It needed a re-cap, about 60+/- re-flowed solder joints (someone got into this thing), a small crack in the main board...I won't bore you with the laundry list.

 

Anyhoo, here's what it looks like inside at various states of disassembly. Unfortunately, I was more concerned with the work at hand than taking pictures, so they are not very comprhensive. But they should give everyone a good idea of the build quality and ease (or lack thereof) of service.:

 

Here's the back of the unit, removed from the back case with the faceplate removed and close at hand for reference.:

Attached File  20131116_082040.jpg   92.02K   114 downloads

 

Here, you can see a small crack in the corner of the main board. It's very solid when fully assembled, so I'm willing to bet this was caused by hasty service.:

Attached File  IMG_0061.JPG   116.66K   21 downloads

 

This small board for the motor speed control was the guilty party responsible for the erratic VU's. It's mounted to the deck chassis with a nylon screw and nut that had failed, causing it to make contact with the VU switch.:

Attached File  IMG_0062.JPG   127.75K   21 downloads

 

Here you can see the back of the unit with all but the main board freed from the chassis, so I could get a good look at the back side of the main board. This is why I refer to it as "The Steel Octopus." :lol: :

Attached File  IMG_0063.JPG   107.44K   35 downloads

 

And, finally, here is the front of the unit, minus the faceplate. I never would have been able to remove it without the service manual - not in a million years. You'll notice the whole chassis system is sheet steel through and through.:

Attached File  20131116_082101.jpg   94.85K   26 downloads

 

I'm just about wrapped up with this project, and I've gotta say - It's been very rewarding to ween this unit off life support. I love the Tape Speed Control and the Source Attenuator (very cool feature). Deck is rock-solid and it drives my Toby D-60's with the greatest of ease. It's gonna be hard to let it go back to it's rightful owner, but it's a loving home and I have been happy to help.

 

Back to it tomorrow, but for today....Happy Thanksgiving!

 

I hope this thread gives members an idea as to what exactly it's like to dig into this monster. :-D

 

 

 

 



#2 Reli

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Posted 28 November 2013 - 08:54 PM

Yep, even the speakers on those things have steel frames.



#3 k2j

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Posted 28 November 2013 - 10:32 PM

Hey, mine could use a once over... What are you charging for a full service on one? ?

#4 BoomboxLover48

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Posted 28 November 2013 - 10:34 PM

That is a Patton Tank! :w00t:  :lol:  :lol:

 

It looks like panny built it similar to a reel to reel type chassis with cassette deck in it. :yes:

 

Great job! Thanks for the pictures! :yes:



#5 fresh produce

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Posted 28 November 2013 - 11:21 PM

Damn that thing is scary!!! I would hate to try to fix mine

#6 restocat

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Posted 29 November 2013 - 01:10 AM

Very interesting.

#7 superlew

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Posted 29 November 2013 - 04:56 AM

That is a Patton Tank! :w00t:  :lol:  :lol:

 

It looks like panny built it similar to a reel to reel type chassis with cassette deck in it. :yes:

 

Great job! Thanks for the pictures! :yes:

 

That was my first thought, Royce. I've repaired a few reel-to-reels now, but the disassembly on the 6400 takes the cake.



#8 oldskool69

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Posted 29 November 2013 - 07:26 AM

As the 'ol sayin' goes..."They just don't build 'em like they use ta'..." :-D



#9 blu_fuz

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Posted 29 November 2013 - 07:34 AM

The engineering involved blows my mind sometimes.

#10 JustCruisin

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Posted 29 November 2013 - 11:06 AM

That's about exactly how mine looks! But, I took mine apart for different reasons... Mine is completely working good.. ;-)



#11 Reli

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Posted 29 November 2013 - 12:09 PM

To think those things only have 15 watts per channel RMS, according to the service manual.  It just goes to show you what a bunch of bullshiz other manufacturer's wattage claims were. 



#12 JVC Floyd

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Posted 29 November 2013 - 01:52 PM

that's one radio i always wanted , i mean that makes even the most awesome box look weak and flimsy by comparison , i don't think too many other boxes can compare to this aside from the rx-a5. not to diss any other box but damn how the hell can anything stand up against that. awesome!.

#13 superlew

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Posted 29 November 2013 - 02:42 PM

Oh, it pounds when I hook it up to my Toby's. I haven't heard it's full potential on the factory speakers, which I do not have. I only took the main unit, since I don't have a lot of space. The tuner really needs to go out for service, and I'd love to know where the ferrite AM antenna went. I honestly believe a 5 year old got into this thing, considering all the little f***-ups I've had to repair.

 

I dream of a day when everyone leaves their tuner service to the pro's. But it's just a dream.

 

I'm rockin' it right now, much to the dismay of my neighbors.   :stereo:



#14 riker1068

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Posted 05 June 2014 - 06:54 PM

Good to see it open. Once I get my hands on another one, I will bolt and bracket it into a 1 piece. Still have to draw it up.



#15 riker1068

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Posted 02 June 2016 - 02:36 PM

This post still makes me cringe. I have 3 now  :drool:



#16 Kenpat

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Posted 03 June 2016 - 11:59 PM

This post still makes me cringe. I have 3 now  :drool:

:w00t:  :bow:  :bow:  :bow:





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