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: