Forum Replies Created
-
Hi and welcome to Beoworld!
Looking at the remote control problem first, the Beocenter may be in A.OPT 0, where is will not respond to remote signals. To fix this, first power up the BC9500 as you have until the CODE display disappears, then with the Beocenter back in stand-by, use the BL1000 remote to press ‘SOUND’ then ‘1’ then ‘STORE’. Then try the remote again.
With regard to the CODE display problem, this probably means that the microprocessor’s 3V lithium battery needs replacing. The normal technique to get rid of the CODE display is:
- Fix the battery or RAM and then
- Using a Beolink 1000 press: 1271
- After 3 seconds, disconnect the 9500 from the mains and then reconnect. This should solve the problem.
If you wish to replace the battery, here’s a picture of the location (red arrow). You need to be careful desoldering/resoldering lithium batteries – not too much heat and wear eye protection just in case.
And this is the replacement battery that I have used successfully in the past: https://uk.farnell.com/renata/cr2450-nfh-lf/cell-lithium-button-2pin-3v/dp/1319731
The lack of response from the lower panel is probably due to the loose glass panels and the forum has lots of advice about these – I talk about re-glueing the panels on the second page of this thread:
https://forum.beoworld.org/forums/topic/my-beocenter-9500-restoration/
I guess i could try connecting RCA to this connector and use second amp as you advised, but seems like it would be quite a mess of cables.
Maybe just touch the tip of an RCA against one of the visible solder joints on the front (connection point of that two-pin connector), and provide the ground elsewhere. This should be a quick test.
Those laser units need to be taken out from the back part, right? I can’t see any disassembly guides on versions with curved laser path and really don’t want to break any plastic tabs.
Page 7-1 of the Service Manual refers and is for the curved laser version. It is only the very end of the service manual that shows the newer linear CD mechanisms. When the service manual says flex-print I think it means the flexible ribbon connector.
EDIT: I meant to add: the reason that there’s no online guides/videos for repair of the curved laser path models is that they tend not to go wrong!!
I really don’t think that your problem is related to the laser or the 47uF capacitor, because if faulty I think this would prevent your laser from reading the CD at all, whereas yours plays and shows track data; the latter can only come from the laser reading digital data correctly. The CD audio output is also digital data until PCB8 carries out Digital-to-Analogue conversion).
You haven’t included a photo of the front unfortunately so I can’t compare, but this is what my BC2300 looks like (PCB8 exposed on the right):
I would look initially to see if there is an audio output from the board shown above. I have annotated the PCB with a red circle and from looking at the service manual I think this is where the audio output leaves PCB8 – there is probably a small (2-pin?) connector (P65) behind the red circle which take the CD audio to the pre-amp/input selector – probably black wires.
If removing PCB8 to investigate, be careful of the ribbon connector about half way up on the left hand side. This receives the digital data from the CD laser assembly, and should also be checked for security.
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?
