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Old 6th February 2011, 07:21 PM   #1
DocTony is offline DocTony  United States
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Default LINN Axis Turntable Motor

Need help on the Linn Axis Pully Motor:
Initially I found that the motor has a hard time starting up. Even with turning the platter by hand, it only revolves a short time and is slow on 33rpm, then stops and little to none on the 45rpm speed.

I have replace ALL electrolytics caps, replaced the R1 resistor with an uipgraded thermistor and the rectifier also upgraded, new drive belt and re-oiled the subplatter well as recommended by a Linn service person.

Still the platter does not rotate freely and eventually stops. The motor has a vibratory noise and sometimes starts backward.

Is the motor shot or some other parts needs replacing. Please help. Thank you
Tony
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Old 9th February 2011, 09:10 PM   #2
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I think the clue here is that sometimes the motor runs backwards. This suggests that you have probably lost one "phase" from the Axis PSU. Get a meter on AC volts across the two phases and I think you will find either one of them absent, low in amplitude, or distorted.

The cause of this is most likely in the output stage itself. Probably a BUX85F.

Do you have a scope?

If you have one phase absent, I'd check the o/p transistors on ohms range and replace as necessary. It may be prudent to replace the associated drivers at the same time. BC184?

This circuit is a bitch to fault find on, and please beware as it is not isolated from the mains and will bite if not treated with proper respect.
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Old 20th April 2012, 06:37 AM   #3
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Default Linn Axis motor

Where can I find a diagram of the motor supply?
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Old 22nd April 2012, 01:56 PM   #4
h_a is offline h_a  Europe
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Location: Graz, Austria
Quote:
Originally Posted by ears12000 View Post
Where can I find a diagram of the motor supply?
Linn Axis Owners Manual, Service Manual, Schematics, Free Download | Vinyl Engine

Quote:
please beware as it is not isolated from the mains and will bite if not treated with proper respect.
Keep that in mind - the circuit directly rectifies mains without a transformer...

Hannes
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