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Since I had basically the same issues on Sony CD player I thought that dirt or dust on the laser could be to blame as well, how deep of disassembly is needed to clean the laser itself and not the lens which is seen from the front side?
I forgot to answer this bit. To be honest deep cleaning of the laser pickup head/mechanism looks quite complex (and I haven’t tried it myself!), so I would leave that for now and investigate some of the simpler solutions first (especially if the CD passes all of the CD Test Mode tests.)
If your BeoCenter 2500 has the curved laser then it is more like the one that is the subject of my later thread here: https://forum.beoworld.org/forums/topic/beocenter-2300-cdm-4-cd-repair/
I have paused work on that at the moment due to family commitments, but actually the CD started working fully after a few days of regular use so I may well leave it for now. Happy to try and assist with your fix though!
These curved tracking CDM-4 CD players seem more reliable than the later linear tracking CDM-12 versions, so these is possibly less information on the forum about fixing the particular problem that you described (i.e CD working but with no sound).
It would definitely be worth trying the CD test modes first so see if that gives a useful indication. Test modes are explained in the service manual at page 7-5 and 7-7. You may find that your CD player passes all the tests, because the fault could be downstream in the audio section.
In my linked thread you can see PCB 8 exposed, which carries out the Servo, disc detector and CD decoder functions on one board (unlike the later models). The circuit diagram is page 2-10 and 2-11. The ‘input’ to PCB8 is a ribbon connector from the back of the CD mechanism, and the audio output can by seen bottom right of the circuit diagram on page 2-11, namely ‘Plug 65 connections 1 and 2’. I would check the physical security of the ribbon cable and of plug 65 first. Also check for an audio signal at plug 65. Note that I am not sure where P68 is on PCB8, but it should be labelled on the board itself.
Good luck, and please come back with any questions as you investigate. Photos may be helpful to explain the problems.
Hi and welcome to Beoworld!
That’s a strange fault, and I suspect that there is nothing wrong with the laser since it is tracking and displaying on the screen. I am not aware of any functions on this model that are only available from the remote, or indeed ‘lockable’.
I would look first at the audio signal connections from the CD Servo PCB to the CD Interface PCB, and also from Interface to Pre-Amp PCB. If the laser unit has been repaired in the past it could simply be a case of a disconnected plug.
Do you have the service manual? This should help you to identify the correct boards and connections to check. Also, is the CD linear tracking (straight path across disc) or the older curved tracking version?
If you ever want to use datalink with the ‘expanded’ input then it could be worth trying to find the B&O Aux Expander, which gave full 7-pin DIN switching from up to 4 inputs. They do come up on eBay occasionally:
Alternatively, connect a Playmaker to the BC9300 Aux input, stream Qobuz from your phone using airplay/DNLA and connect the Revox tapedeck to the Playmaker’s (auto-sensing) aux input. Instead of a Playmaker you could also do this with Essence Mk1 or Mk2.
You will have a different Beoline to me if yours does not need an adapter. Mine is the rectangular one that does need the adapter.
Yours will be the Beoline PSTN: (I have one of these in a box, together with the ISDN version that I am still trying to think of a use for!)
Whereas I am now using the Beoline EU Mk2 (specifically the type number 1130GB):
The older PSTNs (like yours and the pyramid version) actually have better compatibility across the BeoCom phone range. For example, my newer Beoline EU Mk2 will not update the time on my Beocom 2 (Mk1), whereas my previous pyramid PSTN did)
Further to the above, I have just this week changed my phone setup from a BC6000 pyramid PSTN to a Beoline PSTN. The Beoline doesn’t need an adaptor, but I just checked the one that I was using before and it is the right hand one without the white dot (pins close together). However, below is the RJ11 to BT Plug adaptor that was at the BT-socket end, which changes RJ11 pins 3/4 to BT pin 2/5 hence gives the same eventual connection:
EDIT: I just checked and the Beoline PSTN also uses the RJ11 centre pins (3 & 4) with a similarly wired adaptor at the BT socket.
