Forum Replies Created
-
AuthorPosts
-
DillenModeratorYes, the tape mechanism is the same, but keep in mind that the tape controller
and the tape drive has been calibrated together.
If you replace only the tape mech, you must realign everything on the tape controller to match the new tapeheads etc.
Best is to keep the things paired and replace both the drive and the controller.
– Or repair your drive. What has broken?Martin
DillenModeratorThe outer shield of the round DIN plug carries the chassis ground.
If it still hums (that depends on your amplifier), the center pin in the DIN (signal ground) could be shorted to the chassis screw as well.Martin
DillenModeratorAre you thinking about the wrong types of transistors fitted as 5TR4, 5TR5 and 5TR6 in the safety circuit?
They can cause the primary fuse to blow for no apparent reason and are found in
some Beomaster 2200 with serial number earlier than 1470001.
Servicemanuals give out wrong part numbers as well.5TR4 should be a 8320408 (BC 256 or similar)
5TR5 and 5TR6 should be 8320409 (BC 174 or similar).Martin
DillenModeratorCheck the diode.
Martin
DillenModeratorFind an original manual.
Martin
DillenModeratorTR31 and TR32 are only one or two cms apart, in grids G1 (TR31) and F1 (TR32).
Most (but not all) original Beomaster 1900 / Beomaster 2400 servicemanuals have excellent PCB layouts.Martin
DillenModeratorReplace capacitors on the decoder/audio PCB.
Martin
DillenModeratorChatol of course.
Martin
DillenModeratorIn the Master 41 service manual, where the versions B, K , S and RG are covered,
the B is mentioned as the model housed in bakelite.
Of course there must be another explanation for the 510B etc.S is mentioned as a “konsolskab” (Skab = cupboard or closet), so a console model.
“Klangbund” is not really a part of the model name.
The Klangbund (“Soundboard”) is a type of passive radiator for low frequencies, working on what B&O described as an “elastic pillow” of air between the speaker cone and the radiator.
In fact it is the back plate of the receiver, and it’s a (relatively) airtight cover, that will “play along” with the bass (read: deepest notes) using a wall behind the receiver as reflector.Try listening to it if you get a chance, it actually works.
Martin
DillenModeratorB: I think this was only used for bakelite models that were also available in a wooden cabinet. At present I can only think of Master 41K/41B
U: Universal (suitable for both DC and AC mains)
CH: Chartol
K: I think is for Kabinet (cabinet housed) – usually with built-in speaker. I believe this is a leftover from when many radios were also available as chassis’ only
S: Used mainly for console models. S could be for Stรฅende (Standing) or solitair
RG: Radiogramophone (radio/gramophone combination)
RGS: Standing Radiogramophone
BRG: Bord-Radiogramophone (tabletop-radiogram)
P: I think is for Papir-isolation (paper-insulated leads – due to WW2 material shortages)
Martin
DillenModerator1974/75 is correct.
Martin
DillenModeratorCheck the muting switch.
Martin
DillenModeratorDrill through the breaks and glue in steel pins.
Martin
DillenModeratorNo.
The small thermo relay has a yellow reset button sticking out the front near the “Overload” printing.Martin
DillenModeratorIf the whole speaker goes silent, failing contact in the safety (thermo-) relay.
Give it a blast of contact cleaner and excersize it a couple dozen times.Martin
DillenModeratorI can’t find any mentioning of this resistor in my notes, but if it sits in series with the
supply to the regulator it is far more likely to be a 4,7ohm or similar value.
And it should be a flame-proof type.Martin
DillenModeratorA 1M resistor would not be a “voltage limiter”, and it won’t be in series with the supply in any way as even the smallest current would result in a huge voltage drop across it.
Could be a bleeder or a coupling to another part of the supply – but don’t worry about this resistor at this point.Set your meter to DC volts.
Clip your meters negative lead to the negative pin on C3.With the positive lead please take readings on
– C3 positive lead
– IC1 all three pins respectively
– TR5 all three pins respectivelyMartin
DillenModeratorIs the problem from all sound sources (FM/Tape/CD)?
Have you checked or reset the sound settings (bass/treble..)?Missing or partly missing speaker outputs, occasionally able to break through at louder volumes – replace the muting relay (Beoparts-shop).
Martin
DillenModeratorSoldering star capacitors have four leads. One center positive and three negative in the outer circle.
You can fit a general purpose capacitor with reasonable specs instead, just make sure to get the
polarity right and connect any negative pads that were previously connected by the original cap.Martin
DillenModeratorWell.. they just always seem to be great performers.
Of the type 57xx family, Beogram 1700 was the newest of the “squares”.
It has the DC-servo controlled motor, it has the slimline tonearm with the round counterweight (read: easier adjustable tracking force) but still carries the good MMC20-series cartridge.
Good platter, and it doesn’t have the operation panel with the somewhat flimsy buttons found on the sloping models.All in all it’s just a stabile and solid build causing few problems.
Only thing you could argue is that it doesn’t have datalink.
Martin
-
AuthorPosts
