Beomaster 900K tuner repairs

in Imported Content (Unmapped) · Apr 28, 2013 20:43 GMT

OK, I am not totally familiar with FM detector circuits but it looks very much like this uses a ratio detector, and the sudden loss of sensitivity would point at an issue with either the diodes or capacitor(s) in the rat…

Beomaster 900K tuner repairs

in Imported Content (Unmapped) · Apr 23, 2013 10:12 GMT

Yes these are the IF - so ~10Mhz should be their working area? I am at risk of showing my ignorance here though! I have the schematic but need to sit down and figure out the various parts such as oscillator, filters etc …

Beomaster 900K tuner repairs

in Imported Content (Unmapped) · Apr 16, 2013 20:49 GMT

So the radio has been working nicely for the last couple of weeks, only in the last day it seems to have lost some of its ability to find weaker stations. STill gets the local stations fine but stations it previously fou…

Beomaster 900K tuner repairs

in Imported Content (Unmapped) · Mar 27, 2013 09:58 GMT

Replaced with AF126, the actual tuner tunes in very well even with the built-in aerial. The meter moves much more on the other bands.

Beomaster 900K tuner repairs

in Imported Content (Unmapped) · Mar 26, 2013 21:14 GMT

Update - replaced the two transistors and radio now working nicely on all bands. I still need to check the bass/treble circuits and have realised that if I turn the treble right down there is a crackle and the right spea…

Beomaster 900K tuner repairs

in Imported Content (Unmapped) · Mar 24, 2013 21:23 GMT

I've picked up a beomaster 900K which has a few issues, the main one being the tuner being inoperative on all bands. The unit powers up fine and power supply voltages all seem good, other issues being that it sounds very…