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Re: BM4400 Restoration

Any hints/guidance on any of the above issues. Thanks !!

Posted to General Discussion & Questions (Forum) by dahiyas on Tue, Aug 17 2021

Hello once again, this time with a BM4400. When I got it, there was no POWER ON light, when a source was selected the OVERLOAD lamp flashed briefly and that's it. Tested and replaced three blown TIP146's and idle current trimmers. Switched on and all was well. Recap was also completed. Couple of issues still need attention - 1. The Tuning Indicator light does not come ON after the recap. I remember it being one before the recap. I have checked polarity of all the capacitors and everything

Posted to General Discussion & Questions (Forum) by dahiyas on Tue, Aug 10 2021
Filed under: BM4400

Re: Beomaster 5000 Issue

Thanks Martin. Yes, I have nothing connected on the headphone socket, Also, I tried disconnecting the P9 connector and no change. The transistors checkout ok. The voltage between R44 and R42 measures at 20V (instead of 15V). I do not see any voltage changing to 0V when mute is pressed. The MCP shows the mute status correctly whenever mute is pressed. Thanks

Posted to General Discussion & Questions (Forum) by dahiyas on Sun, Jun 13 2021

Beomaster 5000 Issue

Hello again..I recently added a Beomaster 5000 to my collection. (The unit was advertised as "for parts" and completely dead - no standby light). Replacing the capacitors on the processor pcb fixed the standby issue. I replaced the trimmers also and made the adjustments as per service manual guidelines. Current issues - 1. There is no output on speaker 1. Speaker 2 sockets work(kind of..issue 2) 2. There is a lot of distortion (on both speakers) when music is played. Issue 1 - I have already

Posted to General Discussion & Questions (Forum) by dahiyas on Sun, Jun 13 2021

Re: Beomaster 8000 Restoration

All good again. Cable Connector on 9P84 had come off. I assume when I was closing the keyboard it must have got pulled. I had to reroute the cables and problem fixed. Hopefully don't have to open the beast again. Thanks !!

Posted to General Discussion & Questions (Forum) by dahiyas on Sat, May 22 2021

Re: Beomaster 8000 Restoration

oh oh...I closed this early... This morning I tried to use FM and am back to same situation as before with minor changes - 1. In both AUTO TUNE and MANUAL mode, only 1 station is being picked up. In auto tune mode that is also inconsistent. 2. I do see the MPX light coming on for some frequencies. Similarly the signal strength meter does go up on some stations. But there is no sound. In auto mode all is silent, in manual mode just white noise. Everything was ok when I replaced 1IC2-CA8139E 2 days

Posted to General Discussion & Questions (Forum) by dahiyas on Fri, May 21 2021

Re: Beomaster 8000 Restoration

Thank you for the information John. That's helpful. With this I can mark this project as closed (Better half will be as pleased I am ). It took 8 months but well worth the effort. Learnt a lot of new things on the way. John/Martin - Once again THANK YOU for your guidance/pointers in helping resolve the issues.

Posted to General Discussion & Questions (Forum) by dahiyas on Thu, May 20 2021

Re: Beomaster 8000 Restoration

Thanks Martin. Finally !! The problem was 1IC2 (CA3189E). FM works fine now. I also got to see the MPX light :-). Last issue - With volume at 0, I can still hear music from the speakers. Any suggestions ?

Posted to General Discussion & Questions (Forum) by dahiyas on Wed, May 19 2021

Re: Beomaster 8000 Restoration

Hi Martin, I had a spare LF353N. Replaced 2IC3 and no change. btw - The symptoms seems to be consistent with the issue documented by you earlier. I have not seen the MPX light come on and silence on Auto Tune. Anything else I can check before trying to source 1IC2 (CA3189E) ? Thanks

Posted to General Discussion & Questions (Forum) by dahiyas on Sun, May 9 2021

Re: Beomaster 8000 Restoration

I will check the two ICs. Thanks Martin.

Posted to General Discussion & Questions (Forum) by dahiyas on Sun, May 9 2021