How to fix Technics 1200-1210 Runaway and Platter spinning problems.
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- Опубликовано: 13 май 2019
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I have waited to make this video until I had a good amount of time to work on it. This was in my pile of decks with a damaged silver tube so still needs a lot of work, but I knew it would be an interesting repair as I never saw this reverses spinning before, it's normally the fast forward spin known to be runaway.
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I am adding a new rule. No help or questions answered unless it's related to the video and you are subscribed to the channel. It takes up to much time to reply and I am not free tech support.
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I'm not a technician and have very little knowledge about electronics, just basic stuff that you learn from being a hifi gear/music lover (of course, I've own a SL-1210 MK2) but watching your videos is such a fantastic trip and learning experience, love the detail, the explanation, the whole process. Thank you SO MUCH for your generosity in sharing these videos, and congrats for your great work!
Thanks a ton man, had the runaway problem after spending months restoring the turntable and i almost cry. Thanks to your video i solved the issue in 5 minutes. You are doing a great work.
Remind me of my first pair of decks. It was a pair of SL-1700's and both turntables were runaways. Every time after power them up I had to smack hard on the platter and everything ran great after that. Sorry, I was only 16 years old.
Disclaimer: don't try this on your 1200's please :P
Great video('s)!
I had a Technics deck that played forwards and backwards repeatedly! It turned out to be the Brake Pot! Someone had somehow snapped it off so it sat there going crazy! I replaced it and all was good again! I was recommended this page and look forward to building up and sharing knowledge on when these iconic decks get sick!
Thank you Dj Legion I’ve learned so much from your channel. Cheers from Austin Texas!
This is an excellent video, I managed to fix my turntable by reflowing the solder joints on the two large ICs and Q201 even though the joints looked fine to being with. I guess I got lucky.. More importantly, I learnt a lot watching your troubleshooting process.
Fantastic. Finally a video which may help me solve an issue on my Numark TT2400 turntables. They are really nice, vintage, with fantastic Jelco tonarms, but the motor has given up.. - well I suspect its the electrical drive. I really think your troubleshooting will give me some good direction for pinning down the issue(s) and hopefully reviving them - wish me luck! Thank you for your dedication and clear and informative descriptions, I have found every video I have clicked on useful in various ways! :)
Unfortunately I have no idea how the TT2400 work and I very much doubt this video will help, but good luck.
Great info. Runaway at power on, will also be accompanied by the 33 and 45 lamps on at the same time. Q201 runs hot and relies on the leads to carry the heat into the board. This can cause the solder joint to fail over time. I like to use lead free solder as it has a higher melting point.
Thank you for an interesting and informative video.
Great informative video. 👍
Thanks so much for the tips!
Good video!
Great video .
Mostly it goes broken.. Cause the brake works to hard.. When it's stop and the platter goes left, it result problems on An6675 and AN6680.. They communicate each other.. I want to thank you for all your brilliant videos..
excellent informative video ;)
Where this operation manual can be found? looks so handy!
Good video ty..
One Love!
Always forward, never ever backward!!
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Great vid thanks for sharing, i was looking for a solution to this...one of my friends 1210s is intermittently ghosting (ie) while powered on and without pressing start the motor is moving the platter back and forth like a ghost is cueing in a record, the motor and pitch operate normally after pressing start and stop also operates correctly.. ive seen this before but cant remember the cause/fix.
Brilliant! Most informative. I love it when we learn from mistakes. Well done.
Great ! Thanks Loads
thank you,very much appreciated
Would you advice for a runaway speed of tech. SL 1900 on both 33n45.? Thank you.
Hi, I have a problem with the Technics sl 1700. turns on the light, but the rotating plate gives a slight almost imperceptible turn. What could cause this problem? I didn't find a similar problem in any forum or video, I cleaned and changed the engine oil, but nothing works. Can you help me?
Maybe its possible to add resistor to this pin to lower it from 20v to 15v im no technician but just wondering if that would work.
What Zener Diode do you use to replace MA4051?
The Technics deck is just upset that it has to rock that vestax slip mat LOL. Love your vids, best technics repair vids on youtube! great views and to the point, all meat and potatoes. Got my 20yr old 1200mk2's functioning like new and I put those things through hell at countless nightclubs. If you fix mixers do some vids on that. I've got 4 ranging from sounding like shit to f.u.b.a.r. LOL. Keep up the good work!
Thanks I mainly do the same work over and over so don't get chance to repair anything different. Only mixers I work on are DJM 500,600 and Xone 62.
@@DJlegionuk One of them actually is a DJM 600 lol however the mixers are totally back burner projects. The main reason I kept them was to strip for parts and the 600 just needs a new crossfader as I snapped the post off scratching and the hole for the ground pin re-tapped as it is stripped. So really no need for a vid. However I have a question about a tech 1200 mk3 I'm repairing for a friend. Major grounding issues. as it happens him (or a previous owner) who I'm assuming was replacing the tonearm didn't thread the tonearm wires properly to the PC board and one of the five (the ground of course) was cut by the anti skate gear and rendered it too short to reach the board, and was patched with 18awg speaker wire. To my knowledge a patch on those wires must be done with special wire (I forget the name) if at all. Should I try and re-patch with the proper type wire? Does the wire type or gauge matter? Or should I tell him to pony up the $$$ and just buy a replacement tonearm? Sorry for going on and thanks for the quick reply! -C
@@AWO7_BigToph no need to replace the tonearm. I am no expert in the wire gauge stuff , but you have a couple of physical things to think about. Thicker stiffer wires could stop free movement of the tonearm. It also needs to be flexible because of the constant movement over time. You can find the groundwire part on ebay easy enough or you could look at one of the upgrade wire kits like a cardas cable. the cost to replace the tonearm is silly money especially over grounding issues.
On pin 23 I get 19 volts then it disappears after a split second and goes back to zero.. Is that normal?
Hi just read what you said but would real like your advice I’ve got someone servicing my deck and I’m a bit worried they might try and take stuff out of it. Is that a common thing and if so is there serial numbers on the motor and the board to match the serial number on the outside of the deck would really appreciate if you could help me here mate.
That deck is mint. It’s just not looked after at all.
From what I have found, Pin 18 on IC201 will read 0 Volts when you press and hold down the start/stop button.
I only have one question, please answer.
Can the pitch be set to be + 6 / - 6 max?
Of course, 0 is always zero.
I HAVE A QUESTION. MY TECHNIC 1200 (MK2) THE PLATTER SPINS, BUT IT SLOWS DOWN FOR A SECOND AND THEN IT GOES BACK, IT SLOWS DOWN AGAIN FOR A SECOND, IT'S LIKE SOMEONE IS MESSING WITH THE PITCH, IT DOES THAT NONE STOP. THE PITCH SEEMS TO BE WORKING FINE WHEN I MOVE IT. DO YOU KNOW HOW I CAN FIX IT?
hi Legion, i have a technics M5G which the tone arm sticks at certain parts of the record randomly? any direction? so it sounds like a record issue but the vinyl is perfect. thanks
bearings
from an aussie dj great work
At minute 22:00 these soldering joints look very close is that ok? What happens if they’re touching? Thanks.
if they touch it will damage lots of components.
I have the 1200 MKII. I was getting a bit confused because there seems to be variations of the issue in this video. Mine has the light on and spins clockwise really fast. And the only way to stop it is to switch it off. Pressing the start / stop button doesn't do anything.
I just noticed at the end of the video you mentioned runaway, but the light wasn't on in that case.
I would check that part and treat it like runaway first. Then check 5v, 9v and 20v before looking at the signals
you made that look easy soldering that chip in. Are you ever nervous you will accidentally gap across two pins? They look so close like they are nearly touching.
I have years of soldering so not really nervous, i have all the tools and things to remove any solder bridges too.
19:47 'Runaway'-spin problem - faulty transistor Q201
Thank you so much! Now I only need someone with soldering exp. as well as an soldering iron and then my 1210 could be fixed
Good morning. I write from Italy. I saw your video and you are great. I have a problem with my technics 1200 mk2. It is perfect, without a scratch. It was working fine until 3 years ago when I packed it. has been packed for 2 years. I moved home. He started having speed problems. During the reading of the disc, constantly, and for a few seconds, it seems that there is someone who pushes the disc and then slows it down. After that it resumes functioning regularly. I measured the components. Tp5 30V. IC101 AN6675 voltages at 20/25 and 30 V. Even the waves do not comply with the SERVICE MANUAL. The other components more or less respect the parameters. A further problem: the R201 resistance becomes hot when the turntable is on. But the parameters are right. Can you help me? Thank you
Is there anywhere you can buy new ICs from instead of salvage chips?
Ebay normally have them , I just didn't have any at the time of making the video.
Thanks, great vid - is low torque a common problem you have found on these turntables?
Hi, normally weak magnet's on the platter
Dear DJ Legion! Thanks for sharing this video, I highly appreciate it. My Technics SL1210 MK2 has
nearly the same issue. My strobe light comes up, when turning on, than
the platter spins fast only when I press start. With pressing stop it
stops. Do you think this issue is having the same nature?
DJ Legion; thanks for taking the time to make these vids.
Hi Tomas, my deck has is the same issue, I've re-soldered Q201 but no change , did you find the fault?
@@susierowlett7645 Not yet, but in a week or two I'm gonna have an answer, because I'm going with my deck to an electrician, I have the original repair manual (containing the proper voltages on each pin of each chips) and I have a donor motherboard. I'm just gonna flip parts from the donor into the motherboard until it does not fix.
@@susierowlett7645 Hi Susan! Changing the Q201 fixed the issue.
Big up DJ Legion, u r my personal Jesus!!!
I don't have a runaway problem, but rather I have a disc spinning back and forth like it can't decide which way to spin. I went through and checked the voltage and IC302 is really out of whack. The big heat sink chip is fine however. I also checked IC201 and it was fine as well.
The problem is I don't know where to get IC302, any part related to this turntable is rare as hell, and with them being so proprietary it means they can and do crap out, and there's nothing you can do is replacement part is costing as much as a car.
The weird thing is, it was working fine a minute after I got it home, and only the tonearm was screwed up. But then I turned it on and it did that turning back and forth. Owner said it was water damaged or something so that might have been why. I told him he'll need to get both a new motherboard and a tone arm. I can fix the tone arm more easily as it is a mechanical thing, but custom made IC that is discontinued isn't fixable.
what country are you from ? in the UK you can find used boards for £80 ish.
@@DJlegionuk Taiwan, I looked online and they sell new boards for about 200 usd from Japan. I'm fixing this turntable for someone and he's taking a business trip to Japan shortly, he will see if he can get it from the exporter cheaper.
can you clarify when you are testing these voltages with the platter off.... is the table simply plugged in, or is it plugged in and the switched turned to the on position?
it's plugged in and switched on waiting for me to press start. It will give different readings after pressing start, but these will not work unless the platter is in place and that makes it hard to take readings.
The pcb can be damaged if the power is on and the start button pressed when the platter is off... isn’t this correct? Or can damage even happen when the power is on and idle or not pressing start. A table I have has the heatsinked chip get super hot within 5seconds after turning on... not pressing start
@@bimmer100timc I do not know if it will be damaged. It will give wrong readings as it's not seeing the feedback from the sensors it tracks when the platter spins. If the chip is getting hot it could be damaged internally or is supplied with the wrong volts. have you checked the test points.
I don’t have any platter spin on this table. Test point 5 has no reading
@@bimmer100timc what are the other test points showing ? I would just replace D3,Q2,Q3 the ic on the three wires j1,2 and 3, then the drive Ic. and check the AC volts on AC point 1.
Awesome tutorial. My 1210mk2 just stops spinning, very rarely. Then the start button gets it going again.
what happens with the 33-45 ? when it stops spinning does it reset. it could be just a faulty start stop switch if not.
@@DJlegionuk : It is usually set to 33 so when it stops turning, so it stays on the default 33. I'll have to try on 45 to try and replicate the error and see if it resets to 33. Funny thing, this is the first time I took these 2 decks apart and they both did the same thing when I put them back together :). One of them was fixed by unplugging the on off switch and plugging it back in again but the other one wasn't fixed by doing it. Maybe some electrical contact cleaner on the on off switch or something? Thanks for the reply again much appreciated. I'll see if can replicate with 45 but it is very rare it happens.
@@maximusbrexitus9446 if the 45 resets back to 33 then it's like a power reset, but if it stays on 45 then i would just look around the power switch and connections.
@@DJlegionuk thanks
@@DJlegionuk : Turned out to be broken joint on Q201. Both decks were broken on this solder joint but only one was showing weird symptoms. Donated cheers!
Is it totally safe to press the start button without platter installed? Some people are afraid of damage to chips or transistor etc
How can you test without it ? it's very hard to probe anything with the platter on top.
I think the same.
To set up the pitch (Using a Frequency Counter) you Have to set it to play with no platter to adjust VR301! So I misunderstand their fear! Maybe these people should stay away from Electronic Repair. Lol!
First of all thank you for a very informative video. Can you please let me know where to find a copy of your reference service manual? I am trying to sell 2 technics with other issues to help raise funds for my wifes rare cancer. Thanks again. Cheers
just google 1210 service manual
@@DJlegionuk thank you found it made a print. Cheers
Anyone else experience the platter washing machine effect? I measured voltage coming out of ic101 and it’s way over on 2 pins. It also gets hot. I want to replace it but I’m afraid it might be something else. Don’t want to pay for an ic101 just to burn it out.
Update: Ended up being the an6675 chip, which also got hot and voltage was all over the place. I also just did another one: spins super fast when you power it on with no strobe led, just like at the end of this video and it ended up being a defective an6680 chip. So it's hard to tell with that issue, could be the chip or the transistor as mentioned.
please do a video fixing anti skate on 1210 1200
I talked about that on the Gold tone arm video. What part do you want to see ? can you explain a little more.
DJ legion I think the hardest part of doing the tone arm besides setting the bearings is setting the spring not sure on what side it should go. I got confused cause depending on which side you’re looking at the tone arm itself. I can’t remember when I saw you video if you said push that little spring all the way to the left. Let’s say left hand side. But depending which way you’re holding the tone arm. Up side up or upside down. I hope I make sense. Thank you for your brilliant videos
@@rsanchez7111 It's very clear on the tone arm video how to do this. I paused and zoomed at that point to show how to set this up looking from the underside of the tonearm base.
DJ legion thank you. Much appreciate it
And also, this chips are not cheap, sometimes I think that they are much overpriced. Viewing the datasheets I have got an idea that there is a nothing difficult inside and nowadays it is possible to make a DIY alternative using micro controllers or something else. Have you heard about somebody who tried to make an alternative of this ICs?
Thank for video Dj Legion; my 2 SL 1210 that i buyed used in 1998 haved the same problem that in video (at 21 min). it was only welds on transistor effectively; i tried to find the Technics Operating Mode that you follow.... if you have a link, I would like to have it please. Cheers from France// Dj Alienduch from Acid Concept Production.
I mesured 21v dc (and not 20 volts) on R304. i don't know if it's the start of trouble or if this deviation volt remains within the acceptable tolerance ....
Maybe it's angry because of the Vestax slipmat.