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Old 16th July 2017, 09:52 PM   #1
sattwa is offline sattwa  Italy
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Default Help Arcam CD73

Hello guys this is what happened to my Arcam CD73.
Motors in the mechanism suddenly became crazy. If I turn the unit on the player starts the loading and finds no disc but the spinning motor does not stop spinning and also the laser keeps sliding up and down untill it reaches one of the ends, but the motor does not stop trying to move it further and the weels start jumping one over another producing a nasty noise. This happens whith or without CD in the unit.
I did not have problems before and the unit could read all cds correctly, untill one day while I was listening to music the music stopped and a continous noise was produced from the player. That noise, as I tried to explaine before, comes from the two weels of the laser unit that are forced even when the laser is at the end of the rail.
Do you think I would solve the problem by changing the mechanism?
Thank you for helping :-)

Last edited by sattwa; 17th July 2017 at 10:26 AM.
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Old 17th July 2017, 10:17 AM   #2
percival007 is offline percival007  England
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Sounds like you possibly have a Supply missing.

Before changing things you need to make some tests.

Service Manual here....
https://www.hifiengine.com/manual_li...iva-cd73.shtml

P.
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Old 17th July 2017, 10:23 AM   #3
Mooly is offline Mooly  United Kingdom
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Help Arcam CD73
Agree with checking all the supplies. Use a scope to look for excess ripple (I think the Arcam products are ones that suffer from failed caps, look for any that are bulging at the top vents).
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Old 17th July 2017, 10:29 AM   #4
sattwa is offline sattwa  Italy
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Thank you for the answers. This happened in a hot day and the player is located in a place which is not so ventilated. The top was indeed quite hot.
I had a look inside but unfortunatelly found no strange things :-(
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Old 17th July 2017, 10:38 AM   #5
Mooly is offline Mooly  United Kingdom
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Help Arcam CD73
You have to measure the rails next then. I would also disconnect the sled motor to prevent damage to the gears, or take a gear out.

(Make absolutely sure the caps are OK, and if you do an image search for 'failed electrolytic' you will see lots of examples of how failed caps look)
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Old 17th July 2017, 12:34 PM   #6
sattwa is offline sattwa  Italy
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Quote:
Originally Posted by Mooly View Post
You have to measure the rails next then. I would also disconnect the sled motor to prevent damage to the gears, or take a gear out.

(Make absolutely sure the caps are OK, and if you do an image search for 'failed electrolytic' you will see lots of examples of how failed caps look)
Hello Mooly, what do you mean by measuring the rails?
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Old 17th July 2017, 02:02 PM   #7
Mooly is offline Mooly  United Kingdom
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It means checking all the supply voltages, both regulated and unregulated to make sure they are of the correct voltage and also free from noise and ripple.
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Old 17th July 2017, 08:52 PM   #8
sattwa is offline sattwa  Italy
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this is what the inside looks like..
To be honest I am not shure where to test voltage. I have done it several times on vintage valve amplifiers and that was quite easy, but in this case I am a bit confused :-(
Sorry I am quite ignorant
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Old 18th July 2017, 06:17 AM   #9
Mooly is offline Mooly  United Kingdom
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It sounds as though this is going to be above what you are comfortable working on and it would be easy to cause more problems if things went wrong.

You need to be able to identify from the service manual all the separate supplies the player uses (there are many) and then check and confirm all are OK. That is always the first step in any faultfinding.

Your pictures show what seem to be four voltage regulators mounted on heatsinks and two simply PCB mounted. So there are six supplies there together with the unregulated ones (another six). There could be other supplies local to various parts as well.
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Old 18th July 2017, 03:55 PM   #10
sattwa is offline sattwa  Italy
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You are right Mooly, this time unfortunately it's not something obvious.. I will have to go to a servece shop, poor me ;-)
Thank you for your patience ��
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