I can't remember whether you have the service manual - available on site for Silver and Gold members!

If you do have the manual, page 5-8 has details of the CD Test Mode - with information that is more comprehensive than most service manuals and may give a good indication of the fault.  It will also allow you to switch on the laser without CD fitted so that you can observe the light output, if present (view through smartphone camera for safety).

It looks to be in great cosmetic condition, so well worth repairing!

 

When Laser problems, first always check in the technical datasheet that your's is a genuine kyber crystal. Sometimes it may ruin your CD but it is well know to last long – Like 6 or 10 iterations plus spin-offs.

More seriously, if your CD lens is one of the common ones – Meaning 20$ on the bay – don't bother but be ready to try one or two before the right one comes. All details on BW II or there.

And in any cases, try the "deep clean method" widely discussed in our colums.
It does not work everytime but has a fair amount of success.

Finally, in my experience, the weak link in a CD mechanism is the lens, so CD not spinning, no motor noise, etc… Is in most case due to laser fault.
Someone did once explain me the full CD start sequence and it did make sense.

Clean or change the lens.

Good luck.

 

Hi - many thanks for the replies :-)

I have the manual with the test procedure, why didn't I check this first?!

OK - when in test mode and pressing CD, the display briefly reads 1, then settles at displaying 2, which according to the manual is a focus error. None of the other test modes for the CD give any output. Test modes 40, 42, 43, 44, 45, 46, 47, 48 and 49 do nothing, all I hear is a very quite 'blip' from the mechanism, and that's it. I viewed the lens through my phone, and I couldn't see anything on my phone screen when trying test mode 40. I'm wondering - if a focus error is returned from the test mode, does that mean none of the other test modes will work?

Thanks again!

 

With that Test Mode outcome I would be tempted to disassemble, clean what you can (and manually 'exercise' the CD mechanism).  Check traces, components (bulging capacitors?), check that ribbon connectors are correctly inserted.  Then re-assemble and run the test modes again.

Hi,

First, check to make sure the CD transport locking screws on the back of the unit are loose (turn them counterclockwise to loosen.  Then try test mode again, especially 42, 44, and 45.  These will test the movement of the assembly.

I can't tell from the photo if the opening for the laser beam is a vertical straight-line going down from the center of the clamper or a curved (radial) opening that's slightly to the left of center at it's lowest point.  It matters a bit because the laser diode unit (lens) in the straight-line version is less reliable than the radial version.

If you have the straight-line version, it may be that the grease on the rails has hardened and the unit can no longer move at all.  It may need to be cleaned and re-lubricated.  You'll want to check this, I think, to ensure that the assembly can move freely up and down the rails if you get a 3 or 4 from the test mode checks.  You can "exercise" the CD mechanism manually by turning the large white gear to make the assembly move (as Guy has suggested).

The cd mechanism in the radial units is very robust, and significantly different from the CD Pro model (straight-line version) and it can't be "exercised" in the same way. You can tip CD assembly unit (while still installed to the base plate after removal from the BS2000) from left to right in your hand to check and see if the laser unit will move along its radial path.

As Guy suggests, inspecting cable connections, looking for obvious component failures is the way to get more information.

These are very nice units and well worth taking the time to get back into working order.

Good luck!

Bill

 

Thanks for the replies :-)

The drive is the later Philips type, with straight-line tracking. I checked the transport screws, they were in place and were fully unscrewed.

I removed and dismantled the CD drive, then cleaned the lens & mirror as per:

Hi,

I just pulled out one of my Bs2000's with a linear CD drive mechanism (CD Pro) that was working last year.  It would not play a  CD now so I ran through the different CD options in test mode and was able to replicate your results exactly.  I swapped out the complete CD mechanism (transport and servo board) with a known good unit and it worked fine again.  While the BS2000 was out of service it was stored in an extra bedroom and properly covered so no dust could get to it (top. bottom, and sides).  In this case I doubt that cleaning would help.  I would guess from my experience with these units that you need to replace the laser diode.  Check Danish Sound Parts (https://www.dksoundparts.com/) for the correct laser module for your unit.

 

It's well worth the money to keep it up and running properly.

Bill

Sorry to hear that Bill :-(

I wonder what has failed, given your working unit has been powered down, and was found to be faulty on powering up. Maybe a pronged period of no power, followed by power-up causes a spike / damage?

Did your spindle motor move at all in any of the tests, even a touch, or was it completely stationary? I would be interested to know the start sequence for the drive. I'm wondering, if the laser is faulty, then the spindle motor won't receive any power.

But then, would a faulty laser also result in no response to the tests, like 44 and 45, which just move the pickup? I note that test 42 states: 'Turntable motor starts, and the laser switches on and goes into starting position.'  Is this a simultaneous action, or sequential?

So many questions!

When I first ran through the tests I had a CD loaded so I couldn't see what the lens was doing but I could see that the turntable motor was not spinning the disc. The only error code that ever showed up was 2 - focus error.  I then removed the CD and ran through again and the lens tried to focus briefly but stopped and the turntable did not move.  No test was able to move the turntable.  I assume that if the first test (40) results in a 2, no other test after that will work.

I then pulled out a different BS2000 unit that uses the radial type (CDM4 variant) and ran through the tests and everything worked just fine, each test did exactly what it was supposed to do in terms of moving the laser around and moving the turntable.  CDs play properly.

Because I had a known working complete assembly to swap in and test I didn't spend any time trying to diagnose the problem with the bad unit. I suspect a bad laser module as I've replaced many of these linear type units over the years in BS2000s, BS3000s, and BS4000s.  In every case a new laser module solved the problem. I've never had any luck with the deep cleaning process restoring the module but I can see how it would in some cases where significant dust buildup would be a problem.

Good luck with yours