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Dillen

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Viewing 20 posts - 81 through 100 (of 718 total)
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  • in reply to: Beogram 6500 power supply #60147
    Dillen
    Moderator

    Was this Beogram moved to a different mains voltage area?
    Replace the transformer and make sure it is set up correctly for the actual local mains voltage before connecting mains.
    Having siad that – if the Beogram suffered an over-voltage situation, some of the electronics may also have been damaged.

    Martin

    in reply to: Beogram 8002 problem #60116
    Dillen
    Moderator
    in reply to: Beovox S45 Speakers for sale – £165 #60061
    Dillen
    Moderator

    Rosewood it is.
    Teak is lighter and has a finer grain pattern.
    These speakers won’t ever degrade from foam rot, because no foam was used.
    They are excellent speakers.

    Martin

    in reply to: Beogram 4500 (and others) main pcb question #60060
    Dillen
    Moderator

    It was not meant to be disconnected.
    I always desolder the connector from the board.

    Martin

    in reply to: Beomaster 2400 Controle Module #60007
    Dillen
    Moderator

    Normally, these remote controls need very little attention.

    Martin

    Dillen
    Moderator

    Check for excess ripple on the supply voltages (bad filter capacitors).
    If your CPU module has an electrolytic capacitor near the edge connectors, replace it.

    Martin

    in reply to: Beogram 1203 motor restoration, missing piece #59963
    Dillen
    Moderator

    It’s an oil stop.
    It prevents oil from the bearing creeping up the spindle to the pulley.

    Martin

    in reply to: Question About Beogram 8002 Recapping #59851
    Dillen
    Moderator

    I would never increase the current limit of a fuse significantly.
    Sometimes you can find 315mA fuses rather than 300mA. That would be OK.

    Martin

    in reply to: Question About Beogram 8002 Recapping #59775
    Dillen
    Moderator

    Just a side note:
    The 47uF axial capacitor on the subchassis must not rest on the black plastic support.
    There is no room for that. The subchassis movement will be restricted by it when the Beogram is assembled.
    It must be arranged like the original – down on to the metal.

    Martin

    in reply to: Question About Beogram 8002 Recapping #59718
    Dillen
    Moderator

    There are four holes provided for C24 (to allow for components with different pin spacing).
    Going from C27 towards C29 they are negative, positive, positive, negative.
    Note that the two negative holes are connected together through the jumper next to C1.
    This can often cause confusion.

    Martin

    in reply to: Beomaster 3000 2 (2402) transformer hum #59717
    Dillen
    Moderator

    I am not aware of any modern replacements.
    You could ask at Danish Sound Parts.

    Martin

    in reply to: Beomaster 1400 problem #59698
    Dillen
    Moderator

    Nothing missing or broken as far as I can tell.
    The lit sliding pointer just leans against the rails, it doesn’t grip them.

    Martin

    in reply to: Beomaster 3000 2 (2402) transformer hum #59697
    Dillen
    Moderator

    Isolating the secondary merely means disconnecting everything on the secondary (load) side of the transformer.
    Doing this will confirm that the humming is caused internally in the transformer and not as a result of a too high load.

    Replacing the transformer is the only cure.
    Having siad that, the humming transformer will continue to work technially with no problems for many
    years on, but of course the humming can be annoying.

    Martin

    in reply to: Beocord 5500 FFW/REW Issues #59067
    Dillen
    Moderator

    It can be difficult to spot the crack in the worm gear.
    I have seen this several times, and I suggest you look again.
    Or simply pull off the gear and glue it back on using a good 2-comp. epoxy.

    Martin

    in reply to: Beogram 1203 speed problem #59043
    Dillen
    Moderator

    Lubricating the motor bearings is not that easy;
    Clean out in acetone bath for 24 hours, slush around every now and then to flush as much dirt and dry oil remains out of the pores in the metal as possible.
    Allow to airdry for a few hours.
    Submerge in sinter oil containing the correct and required additives.
    Pull vacuum until bubbling stops.
    Release vaccum and leave bearings in the oil for a few hours to allow the oil to soak into the pores.

    -And if the bearings are already worn from running without proper lubrication, even for just a brief moment, they won’t
    ever be any good again.

    Easier is to simply replace the bearings (read here):
    https://www.dksoundparts.com/product/motor-bearings-set-for-beogram-motor-with-3mm-spindle/

    Martin

    in reply to: Beogram 8000 back to life in a weird way #58987
    Dillen
    Moderator

    Reverse spinning at mains on could f.e. point to lack of input to the processor from the tacho-sensor.
    The deck initiates the motor circuit by reversing it ever so slightly to see the feedback from the tacho sensor.
    With no feedback, the reversing command will not stop.

    Could be a bad sensor-opto but is more likely to be a cracked solder joint somewhere – at the ribbon cable or at the CPU socket. In decks with the extra IC 4013 inside the CPu housing, this IC can also be at fault. A scope will tell.
    Ripple on supply voltage(s) can also cause strage things. Did you replace all capacitors in the kit?

    Martin

    in reply to: Beogram 4004 slowing down #58985
    Dillen
    Moderator

    You don’t state if your deck is a DC- or AC-motor version, but in general:
    Dry motor bearings (if never replaced it’s time now).
    Bad speed relay (if never replaced it’s time now).
    Bad speed trimmers (if never replaced it’s time now).
    Bad contact in speed fingerwheel-trimmers (clean them anyways).
    Cracked solder joints at PCB connectors (later decks only), particularly the one for the speed dial panel.
    Bad TVS diodes in motor (not that common but it does happen. AC-motors don’t have them).
    Any combination of the above.

    Martin

    in reply to: Datalink on Beogram Turntable #58748
    Dillen
    Moderator

    It will not work.
    The “old” and “new” datalink systems are not compatible.

    Martin

    in reply to: 80.2 front grid nobs repair #58582
    Dillen
    Moderator

    You can glue on wooden dovel pins instead. Paint them black afterwards.

    Martin

    in reply to: Beomaster 5000 tuner #58581
    Dillen
    Moderator

    The lamps are correct.
    Weak rectifier would be my guess. Wouldn’t be a first.

    Martin

Viewing 20 posts - 81 through 100 (of 718 total)