Author Topic: Micro Seiki MA-100S tonearm info  (Read 812 times)

Offline vleisman

Micro Seiki MA-100S tonearm info
« on: January 13, 2021, 07:35:24 PM »
Anyone know anything about this beautiful arm. I got one with a TT that I bought, kindly delivered to me by an awesome forum member. There are a couple of issues with the arm:

1. The anti-skate weight - not sure what I have is standard. Also not attached to the arm, needs gut replaced - and I'm not sure how it is supposed to work, as in routing of the gut and how it's attached to the arm.
2. Downforce adjustment - similar story as above.

These arms seem extremely scarce, I can't find a user manual or service info for this one. Any assistance appreciated.

Offline vleisman

Re: Micro Seiki MA-100S tonearm info
« Reply #1 on: January 13, 2021, 08:15:00 PM »
Some pics to show off and for reference



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Offline Zilch

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Re: Micro Seiki MA-100S tonearm info
« Reply #2 on: January 13, 2021, 09:59:41 PM »
Damn that look good!  What turntable?
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Offline vleisman

Re: Micro Seiki MA-100S tonearm info
« Reply #3 on: January 13, 2021, 10:26:57 PM »
Some old English rumbler, nothing special  :angel:

Offline Zilch

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Re: Micro Seiki MA-100S tonearm info
« Reply #4 on: January 14, 2021, 09:46:42 AM »
Hmm... looks like a 301 :thinking:
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Offline johan.pretorius

Re: Micro Seiki MA-100S tonearm info
« Reply #5 on: January 14, 2021, 10:09:40 AM »
Hmm... looks like a 301 :thinking:

Right, nothing special then :-)
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Offline vleisman

Re: Micro Seiki MA-100S tonearm info
« Reply #6 on: January 14, 2021, 10:30:37 AM »
Had a call from Fredeb last night and he gave me some good pointers.  :thumbs: I plan to document the process here in this thread, in case anyone else stumbles upon one of these. Also to remind me what I did one day, my memory isn't tremendous.

Offline fdlsys

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Re: Micro Seiki MA-100S tonearm info
« Reply #7 on: January 14, 2021, 12:36:21 PM »
Hmm... looks like a 301 :thinking:
Nope. 401.
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Offline Zilch

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Re: Micro Seiki MA-100S tonearm info
« Reply #8 on: January 14, 2021, 12:44:43 PM »
Anyone noticed I somehow broke the 'like' system in reply #0 and #5 :BWAHAHAH:
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Offline vleisman

Re: Micro Seiki MA-100S tonearm info
« Reply #9 on: January 17, 2021, 02:37:28 PM »
There were 3 issues with this arm
1. Broken arm stand /holder that has been glued back. Not much one can do without parts except clean it up and reglue
2. Anti skate gut is not attached.
3. Some weird weight spring adjustment mechanism also not attached. The jury is still out on what this thing actually does.

The arm rest thing was an easy fix




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Offline vleisman

Re: Micro Seiki MA-100S tonearm info
« Reply #10 on: January 17, 2021, 02:41:46 PM »
The anti skate is a bit more complex. Disassembly consists of removing the top assembly by removing 4 screws, 2 on each side. No need to loosen the red middle screw yet, but can also be done.



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Offline vleisman

Re: Micro Seiki MA-100S tonearm info
« Reply #11 on: January 17, 2021, 02:44:12 PM »
That exposes the central part that holds the scale wheel in place. Loosen the red screw and remove.



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Offline vleisman

Re: Micro Seiki MA-100S tonearm info
« Reply #12 on: January 17, 2021, 02:49:08 PM »
The gut that holds the weight winds around the spiral plastic disc that sits under the scale wheel.
The gut is anchored to the hole somehow. This took a while to sort out. Ended up sticking a toothpick through the hole, attaching the gut to the toothpick and then smoothing everything down so the disc and wheel can turn freely.


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Offline vleisman

Re: Micro Seiki MA-100S tonearm info
« Reply #13 on: January 17, 2021, 02:53:17 PM »
Some more pics of the anti skate surgery

The pin on the plastic disc locks the scale wheel in place through the little hole

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Offline vleisman

Re: Micro Seiki MA-100S tonearm info
« Reply #14 on: January 17, 2021, 02:59:34 PM »
Another tricky bit is getting the length of the gut right. The platter on this deck is high, so the arm sits high, but there is still not enough space to use the full range of movement. Still the basic functionality is working so that will do for now.

Also need to replace the grease to give more resistance to the disc movement, at the moment it either sticks or runs.



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