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Old 13th February 2013, 12:28 PM   #131
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Default Aluminum gears CMK4

Hello all!

Aluminum, or brass gears are an option, BUT think about the other gears that these two make contact with. The plastic will wear off times faster than compared to the all plastic set-up. Apart from that there will be an added noise, which is not that important for the drawer gear, but still. I was about to make brass ones for my VRDS, but then decided to buy original plastic ones.

The plastic of the gears, in my opinion ages due to the higher ambient temperature within the case of each unit, and besides they are all made of regular poliamide, so the idea is for them to actually get broken and we seek out and buy spare ones at the end of the day.

Had they been injection-molded from glass microfiber poliamide, that would have been a completely different story.

Hope that helps

Radko
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Old 13th February 2013, 07:02 PM   #132
hifiboy is offline hifiboy  Germany
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Default aluminum gears

well, I had to replace the plastic gear which was broken. I realised that the transfer of force is quite high on both gears due to the difference in circumverences of the white and the black big gear which controls the drawer. A few of the dents on the white plastic gear were broken. So I decided to design a copy of the white gear in aluminum. In fact I am quite happy with it. I cannot detect an increase in the noise when the drawer moves. Wrt the wear out, I use the aluminum gear extensively for a year or so w/o pbs.
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Old 10th June 2013, 07:48 PM   #133
ManUtd is offline ManUtd  Norway
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Default CMK4 inside Wadia 850

Hi,
Seems like this topic is correct for my question as You all talk about CMK4.

I got a problem with my Wadia 850 as it will not stop the spindle when i press
stop and eject.If i stop the spindle manually by hand CD tray goes out normally.
What is controlling the stop of spindle?
Or if anyone had the same situation like me could help.
Except for this "problem" player is working ok.
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Old 11th June 2013, 03:19 PM   #134
ManUtd is offline ManUtd  Norway
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Smile Hall Sensors?

Are this Sensors controlling stop signals for Spindle?



Quote:
Originally Posted by ManUtd View Post
Hi,
Seems like this topic is correct for my question as You all talk about CMK4.

I got a problem with my Wadia 850 as it will not stop the spindle when i press
stop and eject.If i stop the spindle manually by hand CD tray goes out normally.
What is controlling the stop of spindle?
Or if anyone had the same situation like me could help.
Except for this "problem" player is working ok.
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File Type: jpg DSC_0123.jpg (531.9 KB, 91 views)
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Old 21st October 2013, 05:21 AM   #135
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I have taken the foray into cd player repair. I just replaced the gear in a Krell kav 300cd with vrds-? The optical pickup is a KSS213C, not the KSS240A the parts list indicated. How do you know which version it is? -7, -10, -12
I am hoping someone here can provide a clue to this. At present the drawer now moves and the disk plays, however the disc will not index and no music. What is involved to perform the alignment procedure for the optical pickup replacement? (or just to make it read again?) All help greatly appreciated.
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Old 21st October 2013, 09:17 AM   #136
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Default Krell CD CMK-4

Are you sure you have the KSS-213?

I checked the CD DAC list, and for your model is listed with KSS-240.

With regards to the alignment procedure, do check the service manual for VRDS-T1, although I am not sure there is anything particular there, given you have used genuine spare parts. I will check what I have and let you know.

Is the laser emission ok?

Regards,
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File Type: jpg KRELL CDs.jpg (110.0 KB, 61 views)
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Old 22nd October 2013, 04:32 AM   #137
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Yes, it is indeed the 213. Odd I think, since as you point out that is not common. SN of the unit is: 9097110899 I can see the faint red light with the platter removed. The optical pickup seems to endlessly search. Sometimes the # of tracks and the time appear on display, but the track data never shows up when I press play. Dalbani Corp. in Miami has lot of these repair parts. You may not be able get them in Bulgaria, but they do list on e-bay. The 213 has only one trimmer to adjust. Might it be focus? I do not have a manual. Krell is usually not forthcoming with manuals, but the VRDS-T1 would be good to have.
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Old 22nd October 2013, 06:32 AM   #138
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Default KSS 213 KSS240

Hi!

I am surprised to see that the spare gears are offered still, they are becoming hard to find, I even was thinking of a way to reproduce them since there is a huge number of CMK-4 based players sold worldwide.
Can you point me to this company? What is their price for the two gears, or do they sell them separately?

With regards to the KSS pick-up, the only trimmer on the 213 is the one for the laser emission. You can try increasing it a bit, but first mark the trimmer with a colored marker, so you can reverse the process if needed afterwards.

A good option is for you to buy a spare pick-up, since it seems to me that the emission of the laser diode is low. I have several players showing the same problem, and all of them need a new pick-ups.

I enclose a service manual for the KSS240 plus the service buletin from Sony on the same pick-up.

Hope this will be helpful in terms of adjustment procedure.

Regards,
Attached Files
File Type: pdf laser_sony.pdf (585.5 KB, 17 views)
File Type: pdf KSS-240a_Sony_Service_Bulletin_286R1.pdf (26.7 KB, 17 views)
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Old 23rd October 2013, 03:30 AM   #139
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Thanks very much rad. I think you are right about the emission level. I will take your advice. The information is very useful.
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Old 23rd October 2013, 06:38 AM   #140
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Default optical laser emission meter

Hi!

Not at all, you are always welcome.

Can you please give me the contact details for that company you said offers spare plastic gears, the drawer two-step gear and the sled two-step gear. I will need to obtain one set of those to have at hand.

In order to be sure it is an emission problem, and if you have more pick ups to check, you can use something like this:

Sper Scientific Laser Pocket Power Meter | eBay

This way you will know right away if the laser is ok, or gone.
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File Type: jpg VRDS two-step gears.JPG (52.2 KB, 48 views)
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