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ARCHIVED FORUM -- April 2007 to March 2012 READ ONLY FORUM
This is the first Archived Forum which was active between 17th April 2007 and
1st March February 2012
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Hi Clive, Thanks for the pics - that's a new one on me. The ones I've had in, in the past, have all been with regular TTH (Through-the-Hole) capacitors. I've not seen one yet with the SMD's. In general, SMD caps are far more failure-prone than regular TTH capacitors. IIRC, it's got something to do with the extremely high temperatures
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Hi Wings, This is what it should look like, all assembled. Plastic bits do break off once in a while, and it is not difficult to remanufacture from other bits, and epoxy. I would also give a bit of thought as to why that bit broke off in the first place. My first guess would be excessive strain due to the grease on the 2 axles having hardened, and creating
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IIRC, there is a small disc capacitor at the right rear of the turntable, which is connected bewteen the cable shield and the turntable casing. Check that that capacitor is OK. Menahem
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Check all the capacitors on the Control PCB for high ESR. Most will need replacing. Menahem
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Hi Cubs Have you checked for any semblance of voltage at the main bridge rectifier - AC voltage at the input, and DC voltage at the output? Even if there's no standby light, the initial part of the system may have power. Next I would check the main relays - these have a habit of failing - luckily they can be replaced with fairly commonly available
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Bazooka, I don't want to deflate your balloon of success on this, but understand that these modules are pretty reliable and don't fail willy nilly. You need to check the passive components around the CPU, especially the capacitors, and replace the faulty ones, else the new CPU will fail again fairly soon. Martin (Dillen) has capacitor kits,
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I've got one coming in for repair in about 2 weeks with exactly the same fault - so the customer says. I'll post back my findings on this after I have it repaired, but C2815 will be the first port of call. Menahem
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Hi BeoLab The CD7000, just like the CD6500 and CD5500 before it, is based almost entirely on the Philips CD650 circuits. Even though B&O designed their own PCB's, they certainly did not reinvent the wheel, and the circuits are almost a carbon-copy of the Philips CD650 family (except for B&O's discrete output stage). That was a very smart
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Hi Jon I'm in Israel, and I'd be more than happy to do a "From the Ground Up" complete restoration on your BeoMaster and BeoGram, and return them to new condition, but as Martin wryly observed, the postal costs are probably the biggest obstacle to getting the job done right. That said, feel free to pass my Beogram Restoration article
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I ran a couple of tests - I put in the following capacitors (polypro 100VDC), and scoped the oscillations at 0TR1 collector No capacitor - medium oscillations 10nf - bad oscillations 22nF - bad oscillations 47nF - medium oscillations 100nF - slightly less oscillations than no capacitor. 220nF - no improvemnt over the 100nF I left the 100nF installed
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