ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Listening to the output of various Beomasters was not enough for me so I did not hesitate to accept an offer from someone to take over a silent BM1200; "see what you can do with it". There appears to be a bad contact in the powerswitch or something, anyway after fixing this I got radio receipt, but no Tape or Phono comes through. Where could I start looking for a solution of this problem.
Second question, where is TR145 ( a 60054 or 2N5034) located inside this 1200?
By listening better I can hear a faint sound when engageing Tape or Phono, only when the volume sliders are set in maximum position.
A too high ripple will often cause silence in this model, so there's a place for you to start.The voltage regulator sits together with the output stage transistors at the bottom plate, using it for cooling.Martin
Hi Martin, Thank you for your quick Sunday reply.
Pardon me my asking , but do you mean a ripple on the voltage from the powersupply? to check this shall I start with the big (3000/64) cap?
The power supply, yes.Check it with a scope.
Martin
With the help of a "Beofriend" we found out, thanks to the professional suggestion (quote user="Dillen":"Check it with a scope"), that the 'Phono' problem was caused by the absence of a pre-amp. I connected a BG1500 to the BM1200: on the scope we saw a faint signal . Now I have music through a NAD PP2 pre-amp that I happened to have.The 'Tape' was connected with a cord (why did I pick just this one?, I have numerous ones) with a faulty DIN plug!!
So all's well that ends well.
Thank you