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Universal Capstan Motor

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  #1  
Old 05-17-2017, 07:06 PM
redpackman redpackman is offline
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Akai X-200D Deck - speed problems - motor stalls out in 7 1/2 ips

I'm working on an Akai X-200d I just got. Took it apart today with the help of the service manual I got on line. Cleaned it up. Lubricated it modestly - mostly on the shafts of the belt motor because the screws covering the oil-channels were not budging. Before the cleaning it would play in the forward direction only. I hadn't got to trying to record with it yet.

After the cleaning and putting it mostly back together I put on a pre-recorded tape. Both channels sounded good in the forward direction. Then I hit reverse. Garbled, but after a second or two it'd kick in and sound good in reverse too. I sprayed a switch behind the heads with De-oxit. Kept going back and forth, forward and back. Got so it'd play in both directions after a momentary pause, play and then the sound would kick in OK. I should have stopped while I was ahead. All the above was at 3 3/4 ips which was the speed of the pre-recorded tape. I could also play at 7 1/2 ips, and of course, Johnny Cash sounded like a chipmunk.

Then I switched it once more into 7 1/2 and the motor slowed way down and stopped. I shut it off, not letting it just sit there. I switched back to 3 3/4 and it would play but now it was playing more slowly than normal. The singer was now a bass.

It'll play in 1 7/8 and 3 3/4 (though more slowly than normal) but it just stops when I switch to 7 1/2 ips. I sprayed the switches controlling the speed with De-oxit. Nothing. It will no longer reverse either. Just kind of stalls out.

Both the take up and rewind motors work like champs.

So now what? Like I said, I should have quit while I was ahead.
  #2  
Old 05-17-2017, 07:27 PM
andrewshannon1963 andrewshannon1963 is offline
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Location: Bathurst, Australia
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Bad run Cap

ia, your motor run capacitor needs replacing...your motor is losing torque because the old capacitor has degraded (dried out).
  #3  
Old 05-19-2017, 08:45 PM
redpackman redpackman is offline
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Wiring the new motor cap

I am getting a 2 uf fan motor cap rated for 450volts from eBay. I haven't gotten that far into it thus far. The caps for the take up and rewind reels are in plain sight. Is the cap for the capstan motor also easily visible?

I also understand that it's a dual cap for 50 hz and 60 hz. Being in the USA I'm not planning on this EVER running on anything BUT 60 hz, So I'll just use the 2 uf cap, because I understand that 60hz needs the 2 uf cap.

So am I right in assuming that I clip the wire on the 2uf lead of the old run cap and connect that lead to one of the new 2uf leads and then run the other lead from the new cap to the negative pole of the old cap (or the wire leading to it). Is that right? Are the 2uf, 1uf and common poles on the old cap clearly marked?

Last edited by redpackman; 05-19-2017 at 08:49 PM.
  #4  
Old 05-19-2017, 10:34 PM
andrewshannon1963 andrewshannon1963 is offline
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Careful!

Can you by chance , read a schematic?

The files are freely downloadable from hifiengine.com (you have to sign up to gain access-no cost)
  #5  
Old 05-29-2017, 11:51 AM
redpackman redpackman is offline
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shematic

Yes, I can to a certain extent. I am assuming that the motor cap is connected to the green and light blue wires (and they are disconnected from the original old motor cap.
  #6  
Old 05-31-2017, 09:51 AM
redpackman redpackman is offline
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Solution to my problem

The capstan motor was bad. The windings for top speed were compromised and thus the motor would not run at 7 1/2 ips. Thanks for all the help.
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