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  • Re: Beomaster 4000 - Resistor from power switch to ground

    IIRC, it's a snubber resistor, designed to shunt off the arc energy created, when breaking contact - ie switching OFF the machine. Those arcs, if not mitigated, destroy the contacts of the switch. So the resistor prolongs the life of the switch Check my thread here https://forum.beoworld.org/forums/p/32196/249376.aspx#249376
    Posted to General Discussion & Questions (Forum) by Menahem Yachad on Thu, Sep 16 2021
  • Re: Beogram 1200 repair

    "transparent shrink tube" Now that's a superb idea - I'll remember that!
    Posted to BeoGram (Forum) by Menahem Yachad on Tue, Sep 14 2021
  • Re: Beogram 1200 repair

    Perhaps these members who have good metal workshops, could make up a pulley for you. Soren Mexico, and Evan Search for them, open their profiles, and start a conversation There may be other members who could do so, but these are men who have done excellent work for me.
    Posted to BeoGram (Forum) by Menahem Yachad on Tue, Sep 14 2021
  • Re: Beocenter 9500 no sound at low volumes

    Do not touch any calibration. That's NOT the problem. There are some capacitors which are known troublemakers and need to be replaced. On the small PCB attached underneath the actual laser mechanism, C2103 and also the same types on the Main CD Decoder PCB Once you have removed those 2 PCB's, advise, and I'll be happy to help you.
    Posted to The Workbench (Forum) by Menahem Yachad on Tue, Sep 14 2021
  • Re: BeoLab 9 Overhaul

    [quote user="Teyelvis"] Will the ic be the cause of the orange light and not the caps? [/quote] Absolutely Not! Those IC's are in the Audio Circuit only. Also proof is that immediately AFTER the capacitor replacement, the Orange light problem disappeared. At that point, I had not yet started any troubleshooting on the IC's, and the crackling was still present. Therefore I can conclude beyond doubt, that the Orange light problem was related to the capacitors, and the Crackling was
    Posted to The Workbench (Forum) by Menahem Yachad on Fri, Jun 4 2021
  • Re: BeoLab 9 Overhaul

    A quick summary of the solution: Orange light (solved first): Replacement of some capacitors and one carbon resistor on the PSU PCB, as shown above Replacement of all SMD Electrolytics on all 3 PCB's in the PCB999 module. Crackling (solved last): Replacement of 2 MC33079 Quad OpAmps on PCB1 - the Crossover PCB (inside PCB999 module). This does NOT imply that replacing IC203 and IC204 in all defective BL9's will solve the problem, but it does point to a possibility that any or some MC33079
    Posted to The Workbench (Forum) by Menahem Yachad on Thu, Jun 3 2021
  • Re: BeoLab 9 Overhaul

    Duplicate Post
    Posted to The Workbench (Forum) by Menahem Yachad on Wed, Jun 2 2021
  • Re: BeoLab 9 Overhaul

    Martin, You're right - it is some statement, and I'll stand by it. My workshop organization, cleanliness, environment, workmanship, ability and attention to detail is far above any norm, and the results show. It would also exceed any critical industrial standards, even though I have no need or intention of applying for certification. After working in the Israeli electronic industry, arguably among the most advanced in the world (based on the equipment we are proud to produce and export world
    Posted to The Workbench (Forum) by Menahem Yachad on Wed, Jun 2 2021
  • Re: BeoLab 9 Overhaul

    [quote user="Beobuddy"] It's probably the most reliable solution [/quote] I'll warrant that my repair is more reliable than an original (even if new) exchange module. Those original SMD capacitors are incredibly unreliable, and after having been replaced by regular High-quality leaded units, this unit will outlast an original B&O exchange module. Not to mention that I reflowed all the SMD joints with LEADED solder - that alone will add years to its life, when compared to the
    Posted to The Workbench (Forum) by Menahem Yachad on Tue, Jun 1 2021
  • Re: BeoLab 9 Overhaul

    After 48 hours of testing, the crackling is gone. A quick summary of the solution: Replacement of some capacitors and one carbon resistor on the PSU PCB, as shown above Replacement of all SMD Electrolytics on all 3 PCB's in the PCB999 module. Replacement of 2 MC33079 Quad OpAmps on PCB1 - the Crossover PCB (inside PCB999 module). Done successfully, in spite of me having to do extra troubleshooting work, because B&O refused to share requested info. Fellow BL9 owners having overheating or startup
    Posted to The Workbench (Forum) by Menahem Yachad on Tue, Jun 1 2021
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