I have read about the issue of Philips based players suddenly having reading errors and often the disc will spin CCW , usually at high speed. Some times this is after a 'clock' install , or even a cap replacement. There was some speculation about this problem , but never a concrete answer .
I currently have 2 Philips based players , one is a CD850II , the other is a CD40 based McCormack Signiture. Now I recapped both of these units , in particular the servo caps that dry out. I also install new local power caps around the IC's , along with some bypass caps. Each unit worked fine after reassembly , but after some time (between use) , started having disc errors or skipping. The disc would then start 'rocking' back and forth. After some inspecting and changing the laser with one from another working player , the disc would spin CCW at fast speed , sometimes cotinually , sometimes stopping after 20 sec. I looked for solder bridges with a magnifying glass , looked for broken traces with an ohm meter, Check voltage reading on all power regulators and at all IC inputs.
Is there a common problem that occurs after tinkering? I've done the same procedures to many many players without issue , but a few have really stumped me. Any insight?
Thanks
I currently have 2 Philips based players , one is a CD850II , the other is a CD40 based McCormack Signiture. Now I recapped both of these units , in particular the servo caps that dry out. I also install new local power caps around the IC's , along with some bypass caps. Each unit worked fine after reassembly , but after some time (between use) , started having disc errors or skipping. The disc would then start 'rocking' back and forth. After some inspecting and changing the laser with one from another working player , the disc would spin CCW at fast speed , sometimes cotinually , sometimes stopping after 20 sec. I looked for solder bridges with a magnifying glass , looked for broken traces with an ohm meter, Check voltage reading on all power regulators and at all IC inputs.
Is there a common problem that occurs after tinkering? I've done the same procedures to many many players without issue , but a few have really stumped me. Any insight?
Thanks
Once I was stupid enough (well more then usually) to changed a 2.2µF lytic for wich the value matters... maybe I'm the only one but in case, let's show to the world how can a simple "just upgrade lytics cap" can come to a mess!
Matthieu
Matthieu
Philips "invented" the modern optical disc player ... by purchasing MagnaVox ... So, anything Philips wants, they get, being the gorilla of the optical disc world.
They even have the "exclusive" rights to Sony's Blu-Ray chip designs and firmware.
My understanding is that if any Philips player spins "backwards", it is a semantics question as everyone else would be "wrong", Philips would be "right".
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BTW: The OppoDigital.com DVD/Blu-Ray "universal" player is Number One at the top of Consumer Reports lists = best of breed = mostly because their video circuit does a better job on "up-converting" and reproduction of video, Blu-Ray or otherwise. Their video chips are all Philips. (The audio DAC chips are a mix of Philips and others, depending on the model.)
They even have the "exclusive" rights to Sony's Blu-Ray chip designs and firmware.
My understanding is that if any Philips player spins "backwards", it is a semantics question as everyone else would be "wrong", Philips would be "right".
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BTW: The OppoDigital.com DVD/Blu-Ray "universal" player is Number One at the top of Consumer Reports lists = best of breed = mostly because their video circuit does a better job on "up-converting" and reproduction of video, Blu-Ray or otherwise. Their video chips are all Philips. (The audio DAC chips are a mix of Philips and others, depending on the model.)
Uncontrolled high speed spinning of a CD in a Philips based player, forwards or backwards is usually due to one of two things:
- A failed spindle motor drive amplifier (only applicable for those players using brushed motors).
- A malfunctioning decoder IC (either SAA7010 and SAA7020, SAA7210 or SAA7310). The decoder IC can malfunction for a number of reasons, including a loss of clock, or it can be itself faulty.
I've seen all of the faults mentioned above myself.
So basically, if your having problems with uncontrolled spinning of the spindle motor, have a look at the who motor control sub-system.
- A failed spindle motor drive amplifier (only applicable for those players using brushed motors).
- A malfunctioning decoder IC (either SAA7010 and SAA7020, SAA7210 or SAA7310). The decoder IC can malfunction for a number of reasons, including a loss of clock, or it can be itself faulty.
I've seen all of the faults mentioned above myself.
So basically, if your having problems with uncontrolled spinning of the spindle motor, have a look at the who motor control sub-system.
Are you sure you were'nt looking over my shoulder😉
Just how important are the actual cap values in the servo circuit. You have to know us wana-be elctronic engineers/modifiers think bigger is always better🙂
Very interesting post as that is more or less exactly what my old Mission Dad5 does ....... it will play for a while then abruptly stop with a "ssshhrrrp!". When I open the disk drawer the cd is usually spinning at high speed. The unit has not been modified but I would be interested knowing what you changed to fix the problem.
i have had this problem,and i my case it has turned out to be the decoder chip, SAA......
you can rule out dry joints by simply pressing on the chip to see if the player starts normally, also check to see if it gets hot, that normally indicates a bad decoder. iirc the disc spinning ccw means no clock input?
in the Philips based players i had, this problem was caused by dry joints, even if they measure ok, as the player heats up the connection of the chip to the motherboard can become intermittent
you can rule out dry joints by simply pressing on the chip to see if the player starts normally, also check to see if it gets hot, that normally indicates a bad decoder. iirc the disc spinning ccw means no clock input?
in the Philips based players i had, this problem was caused by dry joints, even if they measure ok, as the player heats up the connection of the chip to the motherboard can become intermittent
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