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Late Beogram 4002 and the 4004 (Types 551x and 552x), which have DC platter motors instead of the earlier synchronous AC motors usually suff...

Friday, November 6, 2020

Beomaster 2400 Type 2902 - Canada Project Tying Up Some Loose Ends and Completing the Reassembly

The Beomaster 2400 has been playing music without a hitch since I started the listening/play tests. 

Now it is time to tie up any loose ends and complete the reassembly of the Beomaster in its cabinet.

There is one more service manual check I needed to make.  That is the audio output level setting the service manual recommends for the volume control.  The procedure uses the Tape audio source input as the reference for setting this volume level. 
The adjustment procedure calls for inputting a 200mV, 1KHz sine wave signal to the Tape source going into the Beomaster.
The volume out measurement is made with a DMM connected to the speaker outputs.
The Beomaster 2400 volume preset level set to the Medium position.
The DMM should read 100mV across either of the channel speaker outputs.  Trimmer 2R136 is used to make that adjustment. What the 2R136 trimmer is doing is adjusting the intensity of the lamp inside the Beomaster 2400 volume control module which directly controls the volume level. 




Now to finish the reassembly of this Beomaster 2400...
Here are the Bass, Treble and Balance indicator masks connected back up to the slider controls.
















I also installed new plastic feet that I get from Martin Olsen at Beoparts.




























This Beomaster receiver arrived with a missing Speaker 2 selection switch lever.  Luckily I had a spare and I got it installed to the bottom plate of the cabinet.



































Finally all of the pieces fit back together.





























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