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bretohne 11th June 2013 09:25 AM

Problem with Krell KAV 250 CD MkII

I am looking for a shematic for the player above, requests for Krell run naturally into vacancy.
The following problem:
The charge is now running again and pulls the CD also.
Laser also drives up 3x and then up and down and
tried to focus. However, the spindle motor is not rotating, the motor I measured with external power and it works. The IC 102 is probably responsible for the spindle motor.
Without switching the whole plan is pretty unproductive,
no voltage specifications, test points.
A cow stood in the mist, because they no longer found.

I hope you can help me.
Best regards

Mooly 11th June 2013 12:24 PM

The spindle motor won't rotate until focus is found. Primary suspect would probably be the laser pickup.

What is the significance of a "cow standing in the mist" ? I'm sure you understand my curiosity :D

bretohne 11th June 2013 03:30 PM

Hi Mooly,
Disorientation, no approach to problem solving.

bretohne 11th June 2013 04:43 PM

Hi Mooly,

It is true that the laser is focused first and he then signal for the spindle motor outputs on the processor, which turns only? When the laser is defective, that is, the signal flow is interrupted?

best regards

Mooly 11th June 2013 06:14 PM

The sequence of events is,

1) Laser on
2) Focus search initiated (lens going up/down)
3) Processor waits for FOK "focus OK" signal at which point the spindle motor is kicked to approx. correct speed.
4) The disc servo takes over and locks the speed of the disc by comparing the data rate off the disc to a known reference... the master oscillator in the player.

So yes, laser defective and the flow is interrupted.

tiefbassuebertr 12th June 2013 06:34 PM


Krell KAV 250 CD MkII
bretohne Offline
RE: Krell KAV 250 CD MkII
Hallo Andreas,
verbaut ist ein CEC TL51Z mit einem
Sanyo SF-P1 Laser, vielleicht hast Du ja einen SF-P1
Beste Grüsse
check out this threads:

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