Dillen
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Bad vol.preset switch. (Contact cleaner + use).
Bad connection to the switch (shorted leads if the old connector type).Martin
I have seen stereo decoder ICs fail in Beomaster 1900. – It’s rare, but it does happen.
However, a failed IC would usually cause complete silence (or slight permanent static), and that’s not what you experience.
Your symptoms (or those of your Beomaster to put it more precise) could point to a
thermal problem, – a capacitor, perhaps – but it could also be something else.Next time it loses a station, try tuning around and see if the lost station can be found near the original point of tuning, as that could point to a drift problem.
Martin
Are all electrolytic capacitors in the tuner area reasonably new?
If not, that would be a place to start.Martin
The center spindle for the cam wheel can be lubricated, but all the small “rattling” arms and levers on the cam wheel should run clean and dry.
They must NOT be lubricated, or things won’t work.Martin
It’s mask programmed by/for B&O.
But these rarely fail.
What are the symptoms?Martin
I have seen cases where Beocord 9000 rec. cal ends as Metal tape detected with a CrO2 tape inserted,
if the Beocords bottom plate is not fitted, so correct assembly is one important thing.Martin
- Kit here.
- Yes. And it must be done in an ESD-safe environment.
- The service manual will tell you how.
Martin
An open-circuit midrange will see all four going silent.
I have one, refoamed and ready.
PM me if you need.Martin
Adjustments can be done through holes in the bottom plate. Refer to the user or service manual.
But trimmers and/or capacitors may be bad.
A service kit is available.Martin
The laser is not specific to B&O.
– But is that a carpet? Get it away from that!
These are static sensitive devices, – (VERY!) easily damaged by static electricity.
Wear an ESD protective wrist band and work on an ESD field mat as a minimum.And of course the shop will accept a return, but if you bought something by mistake they
will most likely (and fairly) ask you to pay the return postage and that could, depending on your location, not be worth it.Martin
A bit difficult to measure.
As long as one end of the capacitor is not connected to anything, only the voltage at the other end is known.
And noone knows what it will be connected to in the future.A foil cap would be a good solution as well – but completely out of proportions quality-wise.
Looking at the rest of the construction there will be other limitations playing in long before any difference from electrolytics to foil caps come into view.
This Beomaster is not an audiophile unit in any way, – never will be and never was intended to be.Martin
Look at the series of components; DIN socket, resistor, capacitor and transistor.
If the resistor is nearest TR100 (and the capacitor is nearest the DIN socket), the caps positive pin should go towards the resistor.
If the capacitor is nearest TR100 (and the resistor is nearest the DIN socket), the caps negative pin should go towards the resistor.Martin
The series of capacitor and resistor can be in either order.
One end of the capacitor carries a known DC level ~ the base voltage of the first transistor.
Seeing as this is an input, we don’t know the level of any DC content of the incoming signal.
It’s a general handrule to make the positive lead face inwards.This also goes for line-level outputs. Positive inwards.
So when coupling an input to an output, it will be negative pin facing negative pin = bipolar capacitance.Martin
C110 (2,2uF series coupling capacitor for phono right channel input) should have
positive pin towards TR100/R111.Martin
I wondering what weight range would be good for a Record Weight for my 4002.
None!
Use no record weights, antistatic mats or other nasties with any Beogram.
If your record is warped, put it under press somewhere else (not on a Beogram) or discard and replace it.Martin
