Beomaster 6000 Type 2702 service manual

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  • #4035
    Vinlyfrontier57
    BRONZE Member
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    Does anyone know if the service manual for the Beomaster 6000 Type 2702 is available in the public domain on the internet.  I can find manuals for what I assume is a later Beomaster 6000, but the one I need is for the quadraphonic version circa 1974.

    (Fyi the problem with the unit is that the power supply pcb (circuit board 5 on the circuit diagram) isn’t generating the 18V rail, so the input selection function doesn’t operate.)

    Thanks.

    #4045
    Keith Saunders
    Administrator
    • Hampshire, England
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    The the following manuals are available in the Beoworld library for silver and gold members.2702

    #4161
    hcraig244
    BRONZE Member
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    Are you sure its not the 21vdc that is fed from PCB2 ?

    I have had a problem with the voltage regulator for the 21vdc in  the past

    Craig

    #4357
    Vinlyfrontier57
    BRONZE Member
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    Thanks for your post, Craig (#4161).

    I checked the 20V and 21V rails that are generated on PCB2.  They measured 10V and 11.5V respectively, so there is a problem here too.

    Can you by any chance remember which components had failed on your unit?  Was it the regulator transistor (2TR8) on the cct diagram?

    Thanks,

    Phil (Vinylfrontier57)

    #4373
    hcraig244
    BRONZE Member
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    Phil

    As I recall I replaced the zener diode 2D9 and the problem pesisted, I then replaced the two diodes 2D10 and 2D8 and still had an issue, I put off replacing the zener diode 0D2 because it was difficult to get at….its hidden away off PCB2 and bracketed against the front end shield box PC1, eventually I had no choice but to do so….and that solved the problem, I cant remember if I replaced 2TR8 or not….the post will be somewhere in the archived forum 2012-2022 along with pictures if you care to try and track it down…..it may help, I would recommend changing 2TR8 seeing as your going to replace the diodes…….good luck I have had lots of fun with the 6000 type 2702 amps.

    #4377
    sonavor
    BRONZE Member
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    Here are a nice series of posts by Alain (boneofiel) showing a complete Beomaster 6000 Type 2702 restoration.  The link starts with the final post and goes backwards.  At the end of each page is a link to look at older posts to continue the thread.

    There is a lot of good information in the threads.

    #4392
    Vinlyfrontier57
    BRONZE Member
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    Craig, thanks for your recollections on which components you replaced in the PCB2 power supply circuit.

    I had noticed from the circuit diagram that 0D2 isn’t actually on the pcb, and could be difficult to get at.  Having done my initial inspection without disassembling the main internals, I now need to start pulling it apart to get the the power supply circuits, starting with the tuner dial cord.  Wish me luck!

    Phil (Vinylfrontier57)

    #4393
    Vinlyfrontier57
    BRONZE Member
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    Hi sonavor, many thanks for the link to the Beomaster 6000/2702 restoration on the Beolover blogspot.  There’s a huge amount of useful info here, which I’ll read carefully.

    Phil (Vinylfrontier57)

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