Krel DSP CDM-1 MkII Pickup Need Schematic - diyAudio
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Old 18th May 2007, 02:26 PM   #1
gto127 is offline gto127  United States
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Default Krel DSP CDM-1 MkII Pickup Need Schematic

The motor on my Krell CD-DSP got jammed and burned up the motor drive IC on the motor board and resistor on the lower pickup board. I replaced the motor drive IC but can't tell what the value was on the burnt resistor. The resistor is in series with another 1 ohnm resistor going to ground. The other side of resistor is going to the -8volt line. There is also a possibility that I bumped the pot on the motor board in disassembly it's at 2.63k which don't sound right. All the other pots on the sub board are set at even numbers ie 10k 750Ohm. If anyone has one of these CDM-1 MK II pickups and can check values or has a schematic-It would be greatly appreciated.
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Old 19th May 2007, 05:17 AM   #2
robo is offline robo  Hong Kong
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Default hi

HI..
i have the sch about that board from CD880.give me you email.i can send you that.
good luck.
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Old 20th May 2007, 07:59 PM   #3
gto127 is offline gto127  United States
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My email is vcrsi@ charter.net Thanks
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Old 21st May 2007, 02:43 AM   #4
robo is offline robo  Hong Kong
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Default hi

please have a check.
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Old 21st May 2007, 04:39 AM   #5
WT is offline WT
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Can I have the schematic as well. I own the same CD player that need to be fixed too.
My e-mail withaya_tangtanaporn @yahoo dot com Thanks
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Old 21st May 2007, 06:37 AM   #6
gto127 is offline gto127  United States
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Default an I have the schematic as well. I own the same CD player that need to be fixed too.

What is problem with your player? I actually repaired mine and had it working perfect until I accidently jammed up motor. (Had disassembled to investigate squeaking noise and somehow a smal plastic piece lodged in the motor causing it to burn up IC and resistor).
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Old 22nd May 2007, 02:22 AM   #7
WT is offline WT
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My player does not read CD. I think the laser is gone. My friend who is more expert than me also confirm that laser is gone bad. The DAC part seem to working fine.

I search the forum and found a few laser head alternative. Unfortunatly, I can not find one yet locally.
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Old 22nd May 2007, 02:48 AM   #8
robo is offline robo  Hong Kong
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Quote:
Originally posted by WT
Can I have the schematic as well. I own the same CD player that need to be fixed too.
My e-mail withaya_tangtanaporn @yahoo dot com Thanks

sorry,WT,i tried to send you the file,but it's said that your email is wrong.
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Old 22nd May 2007, 02:52 AM   #9
robo is offline robo  Hong Kong
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Quote:
Originally posted by WT
My player does not read CD. I think the laser is gone. My friend who is more expert than me also confirm that laser is gone bad. The DAC part seem to working fine.

I search the forum and found a few laser head alternative. Unfortunatly, I can not find one yet locally.
CDM1MK2 is a very good laser,has lond life.maybe the problem is the servo board.the board is not very stable.
or you can fine a CDM4 laser and exchange the part of laser,they are the same.

good luck.
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Old 22nd May 2007, 08:20 AM   #10
gto127 is offline gto127  United States
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Mine had the same problem. First it would try to spin but was slipping. I noticed the rubber grommet on the aluminun hub was almost worn off so I took acetone and cleaned it all the way off. I then took a broken sony playstation and removed the rubber grommet from that. This can be done by taking a heat gun or hair dryer and gradually heating it up(the glue comes off easily once its heated) make sure you remove any glue reside from this so the rubber will be even. Next lay it on its back and spray some duro spray adhesive from about a foot away-wait 30 seconds and place on hub-you will probably have to work with it to get it even. It doesnt go all the way to tthe edge like the original but is slightly thicker which ends up being the perfect height.(I also used this trick to repair Nakamichi cd700-the early version with the poorly designed mechanism). Now ther was no slippage but the player would only read 1 or 2 tracks and would not read some discs.. I then removed the servo board from the pickup and found a defective 33uf capacitor on the servo board(it measured around 29uf) I prefer using a esr meter if you have one. After replacing the cap it would read all tracks on even very scracthed discs. Also you may want to check the 2 big pots on the servo board. The 22k should read around 10k and the 4.7k should read around 750ohm (alot of people mess with the pots and get them off spec) Hope this helps.
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