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Universal Capstan Motor
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  #1  
Old 04-10-2012, 12:58 PM
Stephenhero Stephenhero is offline
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Tascam 134 speed help

i have a tascam 134 that is running too slow. it is outside of the range of adjustment on the internal speed control. i have replaced the belt and 1600/3200 rpm motor and this did not help. where should i look next? thanks.
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  #2  
Old 04-10-2012, 01:09 PM
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Skywavebe Skywavebe is offline
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I have a problem with the model. There were 124, 133 and 234 models. I was never aware of a 134. Something I have missed?
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Skywave Tape Deck Repair- Chicago area
(630)616-0932 Office/ 708-334-2260 Cell, E mail:skywavebe@sbcglobal.net
Past Teac/Tascam Lead Service Technician at Chicago Factory Service still doing repairs.
http://www.thumbtack.com/il/bensenvi...tascam-repairs
Need Tape? http://www.splicit.com/index.html, The BEST SM are from Stereomanuals.com!
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  #3  
Old 04-10-2012, 02:36 PM
rotovator rotovator is online now
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See if this helps

http://www.tapeheads.net/showthread.php?t=8378

I think they all share the same motor
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Old 04-10-2012, 04:19 PM
Stephenhero Stephenhero is offline
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thanks!

i am going to try resoldering the board before i start replacing caps. its been a while since i have had a component apart. i am remembering cold solder joints account for the most of my troubles in the past. i think a lot of this cap replacing really just fixes a cold solder joint issue. the 134 isn't old enough that i would suspect caps - unless of course it was from one of those bad batches we have all had to deal with at one time or another.
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Old 04-11-2012, 12:45 AM
rotovator rotovator is online now
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See also this video of mine

http://www.youtube.com/watch?v=16OOtIjUc2w
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Old 04-11-2012, 07:44 AM
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Skywavebe Skywavebe is offline
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Smile

Hello Rotovator,

I liked this video as it was very clearly done and demonstrated one of the design flaws with the board of the motor. It was made clear that your demonstration did result in the repair of the unit but not so clear as to what the substance was that would make the repair possible and what it was doing. I suspect that what you were using is a form of conformal coat covering that we used at Hughes to put on Aircraft boards that were on aircraft world wide. It is easy to put on but a pain to take off when you have to do other repairs. So is that the type of thing you are using?
Of course I love to have the finding of other technicians published and I have one problem right now that has two Technician stumped right now and it concerns the Bias circuit of a X2000R.
I will create another post for this.
Also on the motors I worked on there was no leaked electrolyte from the surface mount caps that were twisted off and replaced with regular caps of the same type. However, I was not able to get the motor to work again and that is in the past now due to the motor and deck being out of reach. Still this information is invaluable to those of use needing to fix our motors. There may be three failure modes of the motors- moisture and heat reaction, bad caps, and cracked foils or feed through that have gone bad. I have been discussing the finding of a number of other Technical people with regard to these cheaper motors. There are Direct Drive motors that are older but have not ever failed.
With much gratitude for your video!
__________________
Best regards,

Sam Palermo, BSEE, past Broadcast Engineer
Skywave Tape Deck Repair- Chicago area
(630)616-0932 Office/ 708-334-2260 Cell, E mail:skywavebe@sbcglobal.net
Past Teac/Tascam Lead Service Technician at Chicago Factory Service still doing repairs.
http://www.thumbtack.com/il/bensenvi...tascam-repairs
Need Tape? http://www.splicit.com/index.html, The BEST SM are from Stereomanuals.com!
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  #7  
Old 04-11-2012, 08:49 AM
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Skywavebe Skywavebe is offline
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Oh, I should also have added that there were some modifications issued in the different cassette decks that had a variable speed control down at the lower left side of the deck. I have also found on a 112 unit- different motor I am sure, that the pot that was used for pitch control was damaged and no replacement could be found. In this case I notified the client about it and hard wired the pitch control out of circuit. In the modification of the speed external control there were some resistor values changed and the circuit was changed in some fashion. In cases where I put in a new motor that was not original and the speed does not zero in with the pitch control board- it becomes necessary to change resistor values on that board to get
the motor back into the right speed. This is not to be substitute for a motor repair if one is needed as in previous posts but can help where third party parts are required due to no original parts being available.
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Best regards,

Sam Palermo, BSEE, past Broadcast Engineer
Skywave Tape Deck Repair- Chicago area
(630)616-0932 Office/ 708-334-2260 Cell, E mail:skywavebe@sbcglobal.net
Past Teac/Tascam Lead Service Technician at Chicago Factory Service still doing repairs.
http://www.thumbtack.com/il/bensenvi...tascam-repairs
Need Tape? http://www.splicit.com/index.html, The BEST SM are from Stereomanuals.com!
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  #8  
Old 04-11-2012, 08:56 AM
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Dumpster Diver Dumpster Diver is offline
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If you got nothing to lose by replacing the motor, then I'd probly do that If I can't find anything else that could be a potential cause of the slow speed.

if you replace the motor and still have the same problem, then you at least narrow it down one less thing I guess?

and then also would give you an extra motor for a rainy day if things don't work out like they should!

can you test the motor by Value with a volt-meter by any chance to see if it does match the rating in the owners manual?
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  #9  
Old 04-11-2012, 09:04 AM
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Skywavebe Skywavebe is offline
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Hi Dupmpster,
First welcome to the forum as I think you are new here.

When changing the motor the need is to get one that is near the same speed rotation as what was in there. The thing is no one in the Teac company tells you what is in there so you need to go by third part vendors who do research and comparisons as to what Mabuchi motor is rotating at what speed. They also can rotate in the wrong direction. It is possible that a motor can be purchased that is slightly different in speed from the original and so comes the task of adjusting circuits within reason to get the new product to work in an old mechanism. I have done it a few times already and the result was a success.
I am not the owner of this deck and problem but I just thought I would clear up the task to those that are looking on just in case it happens to them.
__________________
Best regards,

Sam Palermo, BSEE, past Broadcast Engineer
Skywave Tape Deck Repair- Chicago area
(630)616-0932 Office/ 708-334-2260 Cell, E mail:skywavebe@sbcglobal.net
Past Teac/Tascam Lead Service Technician at Chicago Factory Service still doing repairs.
http://www.thumbtack.com/il/bensenvi...tascam-repairs
Need Tape? http://www.splicit.com/index.html, The BEST SM are from Stereomanuals.com!
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  #10  
Old 04-11-2012, 01:30 PM
rotovator rotovator is online now
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Quote:
Originally Posted by Skywavebe View Post
Hello Rotovator,

I liked this video as it was very clearly done and demonstrated one of the design flaws with the board of the motor. It was made clear that your demonstration did result in the repair of the unit but not so clear as to what the substance was that would make the repair possible and what it was doing. I suspect that what you were using is a form of conformal coat covering that we used at Hughes to put on Aircraft boards that were on aircraft world wide. It is easy to put on but a pain to take off when you have to do other repairs. So is that the type of thing you are using?
Of course I love to have the finding of other technicians published and I have one problem right now that has two Technician stumped right now and it concerns the Bias circuit of a X2000R.
I will create another post for this.
Also on the motors I worked on there was no leaked electrolyte from the surface mount caps that were twisted off and replaced with regular caps of the same type. However, I was not able to get the motor to work again and that is in the past now due to the motor and deck being out of reach. Still this information is invaluable to those of use needing to fix our motors. There may be three failure modes of the motors- moisture and heat reaction, bad caps, and cracked foils or feed through that have gone bad. I have been discussing the finding of a number of other Technical people with regard to these cheaper motors. There are Direct Drive motors that are older but have not ever failed.
With much gratitude for your video!

Hello. I'm glad you liked it

In the video I used this product:
http://www.crcindustries.com/faxdocs/tchdta/101.pdf

But it is volatile, and does not form a layer but leaves a residue that makes the contacts work. It does the job but maybe not for so long.

So I bought and tried this other one, which should work better and longer:

"CRC Urethane Isolation"

http://pdf.directindustry.com/pdf/cr...20885-_18.html

Maybe you didn't see the leaked electrolyte, I didn't either, but the "proof of the straw" was clear: Something on the board is too conductive.
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