Transplanting a salvaged motor into a high end cassette deck to give it a new lease on life
Vložit
- čas přidán 26. 08. 2024
- Replacing a dead motor in a Nakamichi with one salvaged from a Panasonic system. Totally different motor but it will be made to fit and work.
I never knew why some of these motors have 4 wires, so I learned why today. I love this stuff!
It's pretty bad when the junk of yesterday is far superior than the top-of-the-line crap of nowadays!
I tried a similar MMI-6H2LWDR 12V four terminals Matsushita motor (14 Jan 94 new old stock) on this same Sankyo mechanism to replace the original. And a Bourns multi-turn trimmer for speed control. I could set speed with 3000Hz test tapes and the frequency stability was great. But wow and flutter was very high for some reason. The motor was quiet though, very steady. I tested it in a DR2 and in an Onkyo with same mechanism. Just in case there was a difference in drive electronics. Same bad W&F results. I finally replaced it with a humble Mabuchi normal two terminals 2400RPM CCW that cost me five times cheaper. And the Sankyo mechanism worked in spec with 0.035% JIS wow & flutter measured. Go figure.
Want low WF check out a JVC TD v1010 or technics rsm275. Direct drive flywheel.
@@12voltvids Yes I know, DD is best, I also have a Revox B-215 which arguably has the best cassette deck mechanism ever. There was a wavy pattern of high wow with the dual speed Matsushita motor on the DR2. Maybe too much toque for its Sankyo Mech. A pity because speed stability was remarkable for a belt drive. Anyway, I kept the motor in the parts bin for future use, I may luck out in another deck.
Very experienced electronics engineer with many many service tips on how to repair equipment correctly..
I've been doing electronics repairs for 30yrs and still pick up new ways to repair equipment..
Repairing Nakamichi decks became a problem in the UK when B&W stopped servicing them and parts were no longer available.
Nice fix. I get the suspicion that the motors may have came from the same factory, they look so similar in construction.
The original was a mitsumu and replacement Matsushita.
I wish that I knew just 1% of what you know when it comes to repairing. Then I could change belts, caps and fixing some of my 30+ reel to reel tape recorders, cassette recorders (stationary and portable), MD-players and other stuff. Here in Northern Sweden it is almost impossible to find someone that repairs technical stuff.
Anyway it is interesting and fun to watch your videos and hear your comments about your old boss. ;-)
What that my old boss was a bit of an ass? Aren't they all?
Happy to see this machine running again! Beginning to remind me of Dr. Frankenstein with these "transplants" Another one saved.
Got to do what needs to be done as no new parts available. Sure there are knock off cheap motors from China kicking around. You buy them 10 at a time and you might get 2 that run at a stable speed. Then again, find a gently used 30+ year d motor and you are good to go. These cheap combo units are usually a good place to look. They were typically bought for kids. Sat in their bedroom. They either had the shit run out of them or they sat on the shelf and were barely used. The way to tell..... Look in the tape compartment. If it was heavily used you will see the wear on the head or pinch roller. If no wear is noted on the head then the motor is likely like new. This one had zero signs of wear. Most likely sat in a kid's room and was used as a radio. Kids moved out parents got rid of system. That or it was bought for mom or dad to have in their little apartment after they down sized and was only used to listen to the radio and play Bing Crosby records at Christmas. We sold tons of these when I worked in the shop and those were the 2 demographics. First system for teens or for the senior parents that didn't have the space for the old giant speakers. These were not exactly cheap when they were new. 199.95 for one of these back in 88.
Excellent fix as usual.
That lucky motor find saved this DR2.
Not so much luck, I knew what I was looking for.
Excellent, I was aware of those 4 wire motors, used in machines with high speed dubbing. I must admit I had assumed they just switched power between two separate windings. It makes more sense now that they just switch in different potentiometers to select the different speeds.
I really enjoyed this.funny thing is I have a Denon Dn-790r with the mmi-6h2lwk where the deck has a pitch control function,and my very same motor is doing exactly what the original motor in that Nakimichi was doing,and I am having a devil of a time trying to get a compatible motor to replace it wit
Thanks for the tip on ZaraStudio Software! Luv your Heat Gun - we use BIC as well... Cheers!
When that small mice rescued the mighty lion!😁
a nice little upgrade from the donor deck with the external speed controller :)
Could mount one on the back for a "pitch" control.
I guess in a pinch, if someone was doing this kind of repair without an oscilloscope, a known-good tape-recording of a metronome could help a lot to match speed by ear.
440 tape and a guitar tuner. 440 is the "A" string.
I love your video's i am learning alot about these old decks, i use to own a Sony single deck, with all the dolby's, b,c, and S. a kenwood dual dubbing deck, a kenwood souround receiverd, anyway, they they broke down with several years of neglect. the deck 's would jam and wouldn't open and so i sold the for parts. also had a pair of 3 way speakers by kenwood, and a pair of mishibishi 3 , got rid of everything when i moved into a small apartment. I have now a Yamaha receiver just for music now, fluance rc85 record player and a yamaha cd player, no cassette decks where i have no use for one now, do mostly everything on computer. yeah the 80's were the hayday of cassette decks. shame they all disapeared. its great that lps are coming back, gradually. don't think the tape decks will though. have a good day and keep repairing. you post i will watch, lol.
Lps coming back? Not around here they aren't. Vinyl had its day like dinosaurs. It's extinct as far as I am concerned.
Dave,
To me, this is amazing. I never would have guessed a Matsushita motor would fit a Nakamichi cassette deck. And the pulley fit as well. Are all these motors made by one company? If that's the case, that would tend make more sense that it would fit.
Not Dave, but from personal experience, many decks (80s+?) seem to use the same form factor motor with the screw holes at predesignated spots. This from having changed around a few as well. Even tape head mounts seem to follow this practice. I changed a mono tape head from a very early 60s deck with a late 80s stereo head and it fit right in place.
Mounting is universal. Never seen a motor with a different kind of mounting. This kind of servomotors came from mostly 4 brands, Matshushita, Mabuchi, Sankyo and Mitsumi. Good known brands dont built they motors, they just buy from one of ths companies. Could be small variations on the specification (complete model is different, but they perform good enough).
@@38911bytefree there are a few different sizes. If the motor is physically the same size it will fit. There are also multiple mounting holes to allow mounting in different chassis.
Good example of why I use utility lighters
I confiscated these from my kids that were "holding them for friends so their parents wouldn't know they smoked"! As if they thought I bought that one for a second. And they wonder why they got called an idiot.
In a non smoking home where they watched their grand father struggling to breath in his later years from being a life long smoker, decide to take up that filthy habit. Dumb as a box of hammers.
Wow! Didn't know Nakamichi used single belt across the flywheels and the motor. Pioneer used separate between flywheels and another from the motor to flywheel
Best restore from a cheap thing thing to a good dear thing you were lucky to find that motor
I've been on the lookout for one for awhile. That nak was the one with the stiff motor. Tore it down and lubed. Speed inconsistent i blamed it on a cheap belt. Changed the belt and tested. Speed still wandering so new motor and it is steady as she goes.
@@12voltvids vwwestlife done a feature of different brands of belts some interesting results
I have always wondered if these Nakamichi decks were as good as they were cracked up to be, given the price that was charged for them. You got a basic DC servo motor for the capstan drive when for example lower priced Technics decks came with quartz DD capstan motors. My Technics RS-BX707 had 3 heads, quartz DD motor & cost 200.00 GBP (348.00 Canadian Dollars) in 1991 inclusive of VAT (sales tax) and was a superb performer.
You hit the nail on the head. Nakamichi was just an expensive name on a cheap deck.
These are not servo motors. They are just cheap DC motors. A servo motor has a frequency generator and feedback circuit to the servo. Think capstan motor on acient VHS decks by Hitachi.
@@12voltvids thanks for your reply. One of these days you ought to do a video debunking some of the myths audio(fools)philes believe in and give the view from the technicians bench.
@@davidpinfold852 You can't fix stupid. These audiophools have spent so much money on this crap that they have actually convinced themselves that they can hear the difference between a 5.00 and 500.00 3 foot patch cord, or the difference between 16Ga lamp cort and OFC monster speaker cable hand braided by virgins that cost 100.00 per foot over a 10 foot length. I used to work with one of these types. He did give me a nice Technics slp50p cd player that the door wouldn't stay closed on. I adjusted the latch and sold it for 500.00 to the used stereo dealer, that then turned around and sold it to some other sucker for 700.00! This guy was convinced that all patch cords needed to be directional cables and could only connect in one direction. Hello, it's AC, the electrons go both ways!
Lots of snake oil to be sold to the gullible I guess.
@@12voltvids Thanks for that!
Thanks on 5:18 Without knowing much I have repaired several cassette decks, I say repair because they ended dead, either change capacitors, broken tracks, cold welds, mechanical failures, it gives satisfaction to achieve it, I ask you because I see the motor similar to my Marantz sd 4000, it has a 12v 1 servo motor 1800- 3600rpm, the rotten rubber braked the motor was destroyed, when I disassemble it carefully as I always did, I did not see, I repeat I did NOT SEE two 0.02mm wires coming from the motor shaft towards the plate when I remove it I realize that I cut them, I open the motor and I see that there is a magnet on the shaft and a microscopic coil positioned at the end of the motor shaft where the lid goes, I estimate that when turning the motor circuit, it should check the rpm and precisely adjust the rpm, precisely to complicate it more the Marantz SD 4000 is double speed.
I'm seeing if with a microscope I can see the cut threads and join them with new ones, or will I have to try to clone the micro coil in case you open one of these Marantz motors, it lights up well and looks with a magnifying glass, I've never seen something so ugly, it seems like a trap for let it hurt you
Excuse me for such a long comment, could you explain to me what each cable would do in that cassette player that you have in the video? it looks similar until it has that transistor or component glued to the outside of the motor.
Greetings and thank you very much
Smashing :-D
The panacrappy was worth the money to make the nakamichi good again.
I bet the speed board was not the problem, dodgy commutator brushes.
Or worn bearings.
@@12voltvids yes i forgot about them, the shaft riding around the inner diameter causing speed fluctuation.
Easy to forget the silly stuff, well for me it is :-D
Mr. 12voltvids. You are a Master at electronics. I have an issue pertaining to a Schumacher 2/10/50 amp dual rate manual starter charger, model number SE-1052. Do you have any video's on repairing this type of electronic device? Any help would be greatly appreciated.
Well done!
So an old Matsushita motor from a cheapo music system is more reliable than a Nakamichi high end? 😱🤔
Nakamichi had a cheap Chinese motor in it with their name on a sticker.
Another deck saved!
Great video. I have a Nakamichi cassette deck 2 and wanted to know if you have a ballpark figure on cost of replacing the 2 or 3 oxidized motors?
Couldn't even guess
Nice one
Good fix, but I was thinking you would use a 10 turn pot.
Why? It's not that precise
That was nice. How could I send equipment to you for repairs please,?
Hello Sir, my father in law was rewinding his Akai GX-365 tape recorder. When it was finished rewinding he just lost power. I was wondering is their a fuse in this machine or will a transformer blow out kill the power? Please help, Len from Brooklyn.
The DR-2 was not Nakamichi's TOTL. Nice repair though...:)
Nakamichi were average decks at best.
a bit of nit picking here, maybe you should have took rt measurement of the vr and resistor, and put in a fixed resistor/s of close value. the movement of the motor will maybe adjust the vr
A 9.0 earthquake won't move that trimmer. They don't turn that easily. This is not a volume control designed to be turned. It is designed to be set, and not move.They are actually quite stiff. It ain't going anywhere.
@@12voltvids good-o, just for a bit of trivia rt value would have been nice to know. some nice vids here
smart !!!!!!!!!!
sorry,don’t like this repair,sure you can find the right motor for this deck…
Do i look like i give a shit what you like. You have no clue about tape decks. Nakamichi used the cheapest mechanisms they could get. They used Sankyo motor for capstan. Matsushita (Panasonic) is a superior motor. And no, you can not buy new OEM motors. All the ones you find on eBay are pulls from recycled cassette decks. I could have gotten a new old stock one out if Ontario for 69.99 plus tax and shipping. 97.72 by the time it gets here.
I got a brand new one out if a tape deck i picked up at the second hand store for 10.00.
It's much more reliable now than it ever was, that is if you can call nakamichi reliable. Just ask anyone that was dumb enough to buy a dragon. There is a reason they went bankrupt. If they actually lived to the hype they would still be around.