Sl-7 Disassembly Problem

turning japanese
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amit46
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Joined: 23 Aug 2016 03:23

Re: Sl-7 Disassembly Problem

Post by amit46 » 26 Sep 2019 08:50

I have technics linear tracking turntables models: SL-DL5 (two) and Sl-5 apart from Pioneer PL-L55....
I noticed after complete servicing the units with recaps and some changes.....the players tone arm motors where responding after 3-5 turns of the platter....It was quite clear that the small dc motors permanent magnets had become weak after 35 years..........
I bought some good quality DVD drive motors very similar to the original technics motors from Aliexpress for couple of dollars each.
After replacing each unit with a new arm motor.....the linear tracking movement came alive and was moving the carriage just after half a turn of the LP.
Using a TEST LP I found that the linear trackers sailed through all test tracks....
I am using Audio Technica AT311EP cartridge with a Shibhata Stylus.........
The sound is amazing....both my speakers have bi-amping done with superb reproduction of sound.
These turntable will beat the most expensive pivot arm turntables hands down with practically zero distortion and excellent tracking...

fscl
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Re: Sl-7 Disassembly Problem

Post by fscl » 25 Nov 2019 17:21

Thanks to VE member SL-7 for this link, detailed instructions on cue damping speed...... =D> =D> =D>

viewtopic.php?f=16&t=114973

Fred

johnrainbow
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Re: Sl-7 Disassembly Problem

Post by johnrainbow » 12 Jan 2020 18:42

Wonder if you could help.

Got my dad's sl7 been working great however tonearm started sticking so took it all apart to clean and put a new tone arm o ring. However when I put it back together I can't get the disc selector sliding switch to go back in. I think I must have broke it when I first took it apart im not sure. I didn't take any pictures. To make matters worse I've snapped the case where the screw is situated by the tone arm. What a doughnut!

johnrainbow
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Re: Sl-7 Disassembly Problem

Post by johnrainbow » 14 Jan 2020 08:42

:D

Ok so I have had some success.



I turned the unit with the lid face down and put the disc selector plastic latch onto the circuit board into the correct position, gravity then held it into place I then put the lid back on. The switch on the selector was not quite in position so used a screw driver to move into place into the slot and back in she went and its working again. With regards to the snapped case by the screw under the tone arm. It was a very clean break and it doesn’t seem to affect play as the case doesn’t appear to be directly linked to the tone arm. Does anyone else have any experience of running the SL-7 with a cracked case and missing screw underneath the tone arm, is this ok to do?



I guess I can get a new case but I guess they have stopped making these parts, would it be a case of just getting an old unit and using the old case off that one? I feel so stupid having broken the screw. Does anyone know for a disc selector replacement part?



When I was cleaning everything I also noticed that the metal wire with the spring on the end going into the tone arm tube is scuffed and not completely smooth in parts can this be replaced or is this something not to worry about.



Sorry so many questions I absolutely love this unit and don’t want to damage it any further.



Cheers

fscl
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Re: Sl-7 Disassembly Problem

Post by fscl » 05 Feb 2020 17:53

Detailed drive rope replacement:

https://www.vinylengine.com/turntable_f ... 0#p1030530

Fred

fscl
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Re: Sl-7 Disassembly Problem

Post by fscl » 22 Feb 2020 02:01

Much thanks to VE member Koneo for yet another solution to a sticking tonearm.

https://www.vinylengine.com/turntable_f ... 6#p1034566

Fred

eyewanders
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Joined: 10 Nov 2013 08:20

Re: Sl-7 Disassembly Problem

Post by eyewanders » 01 Mar 2020 00:16

Hello SL-7 lovers. Been away for ages. Popping in just to see if anyone in this thread may have a guess about the sound my table just started making, before I unhook it and open it up (been about 6 or 7 years since I've been in it). It makes a very unpleasant sounding squealing noise at rest, e.g. when the tonearm is at the default position and the platter stops turning. It will still play just fine, arm movement and tracking are a-ok and no noticeable audio issues. But when the tone-arm returns to "home", or right when I turn it on before I adjust arm position or press play, the squealing starts. It's quite bizarre. Any ideas around here?
Cheers
Kevin

fscl
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Re: Sl-7 Disassembly Problem

Post by fscl » 01 Mar 2020 18:51

Squealing may be from the tonearm drive motor not stopping when the tonearm sled reaches its rest position......:-k

IIRC, you can run the turntable w/o the tonearm dust cover. Override switches so you can watch operation with the dust cover open and watch to see if the squealing is from drive motor not stopping. Clean and test home limit switch.

Good luck

Fred

eyewanders
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Re: Sl-7 Disassembly Problem

Post by eyewanders » 01 Mar 2020 21:28

Thanks, Fred. That suspicion sounds likely. (I was fearing a power supply failure initially except it operates just fine and seemed a louder/different squeal than that sort.)

I seem to remember running it with the dust-cover off in the past when I refreshed the rubber bits in there and lubed the worm gear. Been a long time now though - I was in there multiple times in the past but it's fuzzy now.

Can't complain much. It's been a rock since then (seem to remember doing some sort of fix additionally that IIRC was a bit of a DIY hack). Guess it'll be an LP-free week or two - that noise does not sound like it will produce any healthy result left unchecked, but don't have time this weekend. :(

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