I was playing around with a few of my CDM-2 based CD players the other day, swapping the mechanism out of a player I had junked (a CD650) into a CD150. The laser mech from the CD650 just would not track well; tracks one to five were fine, track six was getting marginal, and beyond that it would not track at all. I checked the normal things (friction in the bearings etc.).
It was then that I did some reading, and came across an issue I had never considered before: Static vs Dynamic CDM-2s. It seems that the CDM-2 had two types of radial drive, static and dynamic, and there are different servos for each. This results in four different servo panels:
- No.5725 (static radial drive, on board microcontroller)
- No.5768 (static radial drive, off board microcontroller)
- No.5826 (dynamic radial drive, on board microcontroller)
- No.5827 (dynamic radial drive, off board microcontroller)
And within the model CDM-2/10 there are eight variants:
- Static models; 0000 (Hi-Fi), 0001 (Top Hi-Fi) and 0003 (Leuven)
- Dynamic models; 0008, 0300, 0301, 0303, 0307
Now at the moment I have three CDM-2 laser mechs (a 0000, a 0001 and a 0301) and four servo boards (three 5725s and a 5827). I'd like to run the 0301 laser mech in my Philips CD150, but I need a 5826 servo panel to do this. I've had a look at the schematics of both the 5725 and 5826 servos, and there isn't a whole lot of difference, about half a dozen passive components in the radial drive.
My big question is: Are there any other differences between a static and dynamic servo, especially with the microcontroller programming? Am I going to get a servo that works with dynamic CDM-2s in a CD150 by swapping out those half dozen passive components? I have shown a block diagram of the servo below, with the radial tracking and drive portions highlighted.
And before this I thought a CDM-2/10 was just a CDM-2/10
. Anyone out the care to elaborate on the difference between the static and dynamic radial motors? And does anyone know if the other CDM-2 variants (the /29 etc) are static or dynamic? I would guess dynamic, but I'm not sure.
It was then that I did some reading, and came across an issue I had never considered before: Static vs Dynamic CDM-2s. It seems that the CDM-2 had two types of radial drive, static and dynamic, and there are different servos for each. This results in four different servo panels:
- No.5725 (static radial drive, on board microcontroller)
- No.5768 (static radial drive, off board microcontroller)
- No.5826 (dynamic radial drive, on board microcontroller)
- No.5827 (dynamic radial drive, off board microcontroller)
And within the model CDM-2/10 there are eight variants:
- Static models; 0000 (Hi-Fi), 0001 (Top Hi-Fi) and 0003 (Leuven)
- Dynamic models; 0008, 0300, 0301, 0303, 0307
Now at the moment I have three CDM-2 laser mechs (a 0000, a 0001 and a 0301) and four servo boards (three 5725s and a 5827). I'd like to run the 0301 laser mech in my Philips CD150, but I need a 5826 servo panel to do this. I've had a look at the schematics of both the 5725 and 5826 servos, and there isn't a whole lot of difference, about half a dozen passive components in the radial drive.
My big question is: Are there any other differences between a static and dynamic servo, especially with the microcontroller programming? Am I going to get a servo that works with dynamic CDM-2s in a CD150 by swapping out those half dozen passive components? I have shown a block diagram of the servo below, with the radial tracking and drive portions highlighted.
An externally hosted image should be here but it was not working when we last tested it.
And before this I thought a CDM-2/10 was just a CDM-2/10
. Anyone out the care to elaborate on the difference between the static and dynamic radial motors? And does anyone know if the other CDM-2 variants (the /29 etc) are static or dynamic? I would guess dynamic, but I'm not sure.
Any news ?I was playing around with a few of my CDM-2 based CD players the other day, swapping the mechanism out of a player I had junked (a CD650) into a CD150. The laser mech from the CD650 just would not track well; tracks one to five were fine, track six was getting marginal, and beyond that it would not track at all. I checked the normal things (friction in the bearings etc.).
It was then that I did some reading, and came across an issue I had never considered before: Static vs Dynamic CDM-2s. It seems that the CDM-2 had two types of radial drive, static and dynamic, and there are different servos for each. This results in four different servo panels:
- No.5725 (static radial drive, on board microcontroller)
- No.5768 (static radial drive, off board microcontroller)
- No.5826 (dynamic radial drive, on board microcontroller)
- No.5827 (dynamic radial drive, off board microcontroller)
And within the model CDM-2/10 there are eight variants:
- Static models; 0000 (Hi-Fi), 0001 (Top Hi-Fi) and 0003 (Leuven)
- Dynamic models; 0008, 0300, 0301, 0303, 0307
Now at the moment I have three CDM-2 laser mechs (a 0000, a 0001 and a 0301) and four servo boards (three 5725s and a 5827). I'd like to run the 0301 laser mech in my Philips CD150, but I need a 5826 servo panel to do this. I've had a look at the schematics of both the 5725 and 5826 servos, and there isn't a whole lot of difference, about half a dozen passive components in the radial drive.
My big question is: Are there any other differences between a static and dynamic servo, especially with the microcontroller programming? Am I going to get a servo that works with dynamic CDM-2s in a CD150 by swapping out those half dozen passive components? I have shown a block diagram of the servo below, with the radial tracking and drive portions highlighted.
An externally hosted image should be here but it was not working when we last tested it.[/URL]
And before this I thought a CDM-2/10 was just a CDM-2/10
On the web I don't find descriptions in detail.
Service-Manual is here:
https://www.hifiengine.com/manual_library/philips/cdm-2.shtml
but only for the above mentioned servo boards.
Actually there are must be several upgrades resp. supplements for later released (newer) servo boards, e. g. "5886" for CDM-2/10 (used in later versions of Philips CD660/CD670), "5888" for CDM-2/26 (used in Cambridge Audio CD-3) and 6105 for CDM-4/11 (Cambridge Audio CD-2 and Micromega "SOLO" first series).
This servo boards contains two adjustments:
1) Laser Power (VR 3106)
2) Focus Offset (VR 3146)
The older servo boards mentioned in the CDM-2 service manual from hifi engine contains either only one adjustment (Laser Power VR3106) or two adjustments (additional Tracking offset VR3165) but no focus offset.
Thanks for advices for finding the CDM-2 servo board supplements and Philips/Marantz models where the "6105" servo board together with CDM-4/11 is in use.