ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hi, I recently picked up a nice BC9500 and was pleased to note the tape mech was still working very well (had expected to have to service it). Workes so well in fact that I suspect it is the same as was used in the 9000 and Beocord 5500s, which seemed to be more robust (belts). I think later versions of the 9500 and then 8500 onwards used a single motor config which were less well engineered (IMO) and many have now run out of steam and need new belts. These mechs are more fiddly to service I've found. Anyway, I don't want to take my 9500 apart just to look. It certainly sounds like the original mechs (bit slower on auto-revers switch-over). This 9500 is a very early issue Ser Num 06xxx from Dec 1989. So does anyone know when the 9500 mech switched over to that used in the Beocord 6500 and 7000s, again lesser beast I feel. Would be reassuring to know then when my 9500 needs new belts then it's a much easier task than with later models?
If the tape drive spindles have a Phillips screw in the centre, then it is the earlier tape mechanism.
Regards Graham
Graham, I will check but sadly I've lost interest now as I was at my mums this weekend and as I was using the system the CD developed a fault, right there in front of me. Not one of the usual faults it would appear, just a horrible noise when you select CD. The disc spins ok but I'm thinking it's the audio section on the CD module. Rest of the system is fine (Radio / Tape) sound wise. Just CD is broke, I think it happened during a lightning storm so may have had a surge and the power supply to the CD or the D2A converter electronics may be damaged? The unit relays switch a couple of times when CD is selected but then it reverts to Stand By. Do you have any spare CD mechs to sell or are you interested in servicing it for me. It is in mint condition? Gutted. I can do the fix myself but it's a risk just getting a replacement mech from say a 8500 and hoping for the best? Could easily be something else on another board. Not studied the 9500 that much to be honest. Looks like that's going to change :-(
I've never seen this fault before but I would look at the CD Interface board first.
Is this under the disc mechanism or a section of one of the larger boards under the middle part of the unit? When I said I'd swap the mech I really meant the associated boards. I don't think it's a disc control / servo board type fault, more like an digital or audio processing / pre amp part. There's mains ripple on the audio noise you hear with CD selected so possible blown short or open cct cap / diode etc Something really small but with drastic consiquences for the audio.
Jackplug: Is this under the disc mechanism or a section of one of the larger boards under the middle part of the unit? When I said I'd swap the mech I really meant the associated boards. I don't think it's a disc control / servo board type fault, more like an digital or audio processing / pre amp part. There's mains ripple on the audio noise you hear with CD selected so possible blown short or open cct cap / diode etc Something really small but with drastic consiquences for the audio.
It doesn't sound like a fault on the servo board , which is the one under the CD mech.
If I were a betting man, which I'm not, I would look at the CD interface board which is where the ribbon cables from the CD mech terminate and contains the D/A converter chip and the CD control chips as well as the power supplies. It is situated behind tin box containing the microprocessor and memory chips and between the mains transformer and the tuner board.