Marantz TT15 motor noise problem

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rbmitch2
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Marantz TT15 motor noise problem

Post by rbmitch2 » 12 Oct 2019 19:02

My Marantz TT15 motor unit is quiet at first and then gets louder (almost sounds like a scraping sound) with extended use. It is very audible from my listening position. The motor pod also becomes pretty hot at this point. I pulled the top off, put a drop of oil down the shaft and noticed that the motor itself has a lot of vibration when turned on. Any ideas for a fix? Marantz wants $489 for a replacement part.

Copperhead
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Re: Marantz TT15 motor noise problem

Post by Copperhead » 13 Oct 2019 14:40

rbmitch2 wrote:
12 Oct 2019 19:02
My Marantz TT15 motor unit is quiet at first and then gets louder (almost sounds like a scraping sound) with extended use. It is very audible from my listening position. The motor pod also becomes pretty hot at this point. I pulled the top off, put a drop of oil down the shaft and noticed that the motor itself has a lot of vibration when turned on. Any ideas for a fix? Marantz wants $489 for a replacement part.
Is the motor itself the part they want $500 for and have they actually looked at it? I assume you have isolated the scraping sound to the motor and it's not the platter rubbing somehow.

I would try oiling the motor again and running it without the platter for a few minutes, unfortunately I have never seen one of these motors so can't comment as to taking one apart.

There have been threads about these motors vibrating, though, but it getting hot is something you should investigate.

rbmitch2
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Re: Marantz TT15 motor noise problem

Post by rbmitch2 » 13 Oct 2019 15:44

The sound is definitely coming from the motor. I took the top off of the motor unit and could feel how much the actual motor inside the pod is vibrating. Have oiled the shaft twice to no effect. Have not contacted Marantz yet but have a hunch they will suggest replacement.

https://marantz.encompass.com/item/1104 ... PM100020R/

https://i.postimg.cc/rs9q2x1M/Marantz-T ... 0x1300.jpg

Copperhead
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Re: Marantz TT15 motor noise problem

Post by Copperhead » 13 Oct 2019 16:12

Not looking good, that's an expensive motor. Could you not have someone to look at it before sending to Marantz?

lenjack
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Re: Marantz TT15 motor noise problem

Post by lenjack » 13 Oct 2019 18:23

Is the motor something you can easily remove to examine it closely under good lighting? I note there is a service manual available on ebay for a reasonable price.

rbmitch2
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Re: Marantz TT15 motor noise problem

Post by rbmitch2 » 14 Oct 2019 15:00

lenjack wrote:
13 Oct 2019 18:23
Is the motor something you can easily remove to examine it closely under good lighting? I note there is a service manual available on ebay for a reasonable price.
It is easily accessible. The heat after extended use is from the motor unit itself. The service manual online is only a list of part numbers, so not much help.

https://i.postimg.cc/vHYNpcMz/20191013-110412.jpg


https://i.postimg.cc/nh0QcVsp/20191013-110451.jpg

Alec124c41
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Re: Marantz TT15 motor noise problem

Post by Alec124c41 » 14 Oct 2019 15:10

You can oil the bottom bearing, too. Don't know if it will help.
I see 2 screws in the mounting plate. These might reveal more screws to get inside the motor, itself, if it doesn't actually open the motor.

Cheers,
Alec

Coffee Phil
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Re: Marantz TT15 motor noise problem

Post by Coffee Phil » 14 Oct 2019 18:26

Hi rbmitch2,

That motor is a simple 2 phase hysteresis synchronous motor. It should cost no more than a few tens of dollars. Marantz price is a rip-off. Check the phase shift capacitor. If it is bad I can conceive of the motor running hot.

If the motor is truly bad we need to find out how many poles it is and find a replacement from a motor manufacturer like Hurst. The speed will be 3600 RPM divided by some integer, for example: 1800, 1200, 900, 720, 600, 450 RPM.

You can figure the approximate speed by the ratio of platter diameter to motor pulley diameter, then compare it to a synchronous speed which can be had from 60 Hz. With that knowledge go the the catalog of Hurst and find one which will fit.

Alternatively you can go to Esoteric Sound: https://www.esotericsound.com/access.htm and get their DC motor conversion kit. It is spendy but less that Marantz rip-off price and you will be able to play records of any speed.

Phil
rbmitch2 wrote:
14 Oct 2019 15:00
lenjack wrote:
13 Oct 2019 18:23
Is the motor something you can easily remove to examine it closely under good lighting? I note there is a service manual available on ebay for a reasonable price.
It is easily accessible. The heat after extended use is from the motor unit itself. The service manual online is only a list of part numbers, so not much help.

https://i.postimg.cc/vHYNpcMz/20191013-110412.jpg


https://i.postimg.cc/nh0QcVsp/20191013-110451.jpg

markcass
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Re: Marantz TT15 motor noise problem

Post by markcass » 14 Oct 2019 18:38

Hi

It's a bit hard to make out from the label, but it looks as though it might be a motor that runs at 250 rpm on a 50Hz supply. In that case, it would run at 300 rpm on 60Hz.

HTH

Mark

journeymanj
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Re: Marantz TT15 motor noise problem

Post by journeymanj » 14 Oct 2019 18:57

It looks very similar to Philips/Premotec etc motors.

http://www.farnell.com/datasheets/1685512.pdf

https://uk.farnell.com/allied-motion-pr ... dp/1784855

This motor has a similar speed and voltage requirement, if the shafts a similar diameter etc I dont see why You cant replace with this. It and a few variations are fitted to loads of European turntables so is easy enough to find ,eg a Rega motor.

rbmitch2
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Re: Marantz TT15 motor noise problem

Post by rbmitch2 » 14 Oct 2019 20:47

journeymanj wrote:
14 Oct 2019 18:57
It looks very similar to Philips/Premotec etc motors.

http://www.farnell.com/datasheets/1685512.pdf

https://uk.farnell.com/allied-motion-pr ... dp/1784855

This motor has a similar speed and voltage requirement, if the shafts a similar diameter etc I dont see why You cant replace with this. It and a few variations are fitted to loads of European turntables so is easy enough to find ,eg a Rega motor.

Wow - it looks almost identical. Very helpful information and that motor is even available in the US from Amazon and Newark. I am a total novice with electronics, so hopefully I can find someone here in Tucson to assist. Hard to believe that Marantz willl only sell the entire assembly.

lenjack
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Re: Marantz TT15 motor noise problem

Post by lenjack » 14 Oct 2019 21:08

Keep us updated.

journeymanj
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Re: Marantz TT15 motor noise problem

Post by journeymanj » 15 Oct 2019 03:07

I would swap the capacitor/s first as they are sometimes the problem.
A lot cheaper and easier to find than the motor.
If you find an electronics Guy local to You, this is an easy job for someone in that "game".
They can easily cause heating and vibration if they fail.

Copperhead
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Re: Marantz TT15 motor noise problem

Post by Copperhead » 15 Oct 2019 03:25

journeymanj wrote:
14 Oct 2019 18:57
It looks very similar to Philips/Premotec etc motors.

http://www.farnell.com/datasheets/1685512.pdf

https://uk.farnell.com/allied-motion-pr ... dp/1784855

This motor has a similar speed and voltage requirement, if the shafts a similar diameter etc I dont see why You cant replace with this. It and a few variations are fitted to loads of European turntables so is easy enough to find ,eg a Rega motor.
You are right, I didn't see the photograph properly earlier. It does look like a premotec. After hearing how much Marantz wanted I assumed the motor and electronics were far more complex. Might be an easy and cheap fix after all.

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