Beomaster 5500

5th February 2010

If the output transistors (IC200 and IC201 or their left channel equivalents) have to be replaced then the following components should be checked before switching the set on again: R228 and R229 (both 0.22R), R220 (270R fusible), TR205 (BF423) and TR206 (BC547B). Don’t connect the loudspeakers before the mid-point voltage has been checked and confirmed to be within a few mV of 0V and check (and if necessary adjust) the bias current too, while the amplifier is still cold. The Beomaster 5000, 6500 and 7000 all use a similar circuit and can be dealt with in the same manner. [Beomaster 5000, Beomaster 5500, Beomaster 6500, Beomaster 7000]