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  • Re: Operating frequencies of Beo4

    Hi, B&O used 455 KHz as carrier frequency at least since Beolink 1000, every remote afterwards used it also. Only with Beo 5 and 6 you can send with a lower freq. To receive the 455 KHz you can try to get a TSOP7000 (Standard package like other receiver chips) or the TSOP5700 which is the SMD version. Both are capable of receiving the 455 KHz IR signal, demodulate it and give the transferred information at its output. Another possible solution is an old MCL Tranceiver which also receives 455
    Posted to General Discussion & Questions (Forum) by RaMaBo on Sun, Jul 14 2013
  • Re: Beocenter 2300 CD issues.

    Hi, the CDM-4 Unit moves the laser in an arc whereas the later units move linear. The CDM-4 very often suffers from the 'C2103' problem. In the Beocenter 2300 / 2500 it's the C100 on the 'CD SERVO Motor System AND DISC DETECTOR' Board 97. The Capacitor is a 47µF connected between Pin 17 of TDA 8808T and Ground (Focus Servo).
    Posted to The Workbench (Forum) by RaMaBo on Thu, Jul 18 2013
  • Re: Which Beomaster 6000 - mid70ties or mid 80ties model ???

    Hi Olly, hi Jaques, have a Beocord 5000 Type 4705 in a good working condition but i'm also a bit afraid of the dark cloud chewing tapes over this nice tapedeck. I'm interested in both modifications. so would be pleased if you can you send me both proposals.
    Posted to Vintage Products (Forum) by RaMaBo on Tue, Jul 23 2013
  • Power Supply Board of Beovision 3 ( same as Avant 32 Real Flat)

    Hello, i have a Beovison 3 MK I (8800) which suddenly had a fault with the power supply. The TV was switched off with the mains switch (lower left under the frame). When it was switched on the standby LED didn't come on and also no reaction on pressing TV, DTV, VMEM or DVD button. Removed the uper and lower back to check the mains fuse, which was okay (what else ). So i checked the function of the mains switch, the power cable and everything else until i reached the input of the main power supply
    Posted to The Workbench (Forum) by RaMaBo on Sun, Aug 18 2013
  • Re: Power Supply Board of Beovision 3 ( same as Avant 32 Real Flat)

    Hi, thank you for your hints and tips! I will try to check the next few days if there are 5V at the CPU elcos and 8V at the 150V lines during standby. You are correct that my measurement was done without the mains connected. Thanks for the hint of the 8V going up to 150V when tv is switched on. Prevents me from getting a surprise :) Will report back if i did check the 5V and 8V. Hopefully the 5V are missing and 8V is available.
    Posted to The Workbench (Forum) by RaMaBo on Thu, Aug 22 2013
  • Re: Beomaster 8000 Project

    Hi, the voltages you measure seem to be fine. Concerning the blown fuse it's a 250V / 2A type. Those 3-pin fixed voltage regulator chips (78Mxx) are rock stable but have one weak point: If the output voltage is higher than the input voltage they get damaged. and that's what you probably did: Shorting the input while the ouput is still at 5V shot the regulator chip into silicon heaven (and the fuse too ). Nowadays a well designed powersupply has an additional fast schottky diode from the output
    Posted to The Workbench (Forum) by RaMaBo on Fri, Aug 23 2013
  • Re: Power Supply Board of Beovision 3 ( same as Avant 32 Real Flat)

    Hi, i was a bit successful in so far that i mounted the powersupply board in the TV set and got all connectors mounted back in place. After that i connected the mains cable to the TV and tried to meassure the 8V Standby but with no luck. Checked all other Pins of the two cables going to the mainboard but no voltage came out. Okay i know i have forgotten to switch the TV on with the mains switch Switching the TV on gave me the standby light nearly immeadiately. This made me wonder because nothing
    Posted to The Workbench (Forum) by RaMaBo on Mon, Aug 26 2013
  • Re: Avant input control (8133)

    Hi, there's one possibility when your Avant has a Dolby Digital Modul installed. Then you can connect your Video Source via scart and a different Audio source digital Audio via RCA connector. But that's not very comfortable, you need at least a second remote for the digital Audio source to control it.
    Posted to General Discussion & Questions (Forum) by RaMaBo on Mon, Aug 26 2013
  • Re: Beomaster 8000 Project

    Hi, do you have the Beomaster 8000 Technical Product Information here from this side downloaded? There are very interesting details about the function of several parts of the different circuits in the Beomaster. Try starting the beomaster without your dimbulb tester, maybe this helps to get the BeoMaster running. The switching on of the big transformer is done by the microprocessor and the two relays to reduce the input rush current when the trafo gets powered. This might interfer with your dim bulb
    Posted to The Workbench (Forum) by RaMaBo on Tue, Aug 27 2013
  • Re: Beomaster 8000 Project

    Learning by doing can be very effective So finally the beast is working again the one elco in the 55V power supply section reading about 8000µF could be replaced too to get the job very well done, It's nearly out of tolerance this could be due to high temperature and age. If you find a elco with about 10000µF and the correct voltage (or a bit higher) and with the same size (maybe a bit smaller) you could change this one too. Saves you same trouble in a few years maybe.
    Posted to The Workbench (Forum) by RaMaBo on Wed, Aug 28 2013
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