Søren,

Looks like another great project…. and you always, but ALWAYS keep things interesting. 😁

Like Rich, I admire the Beomaster 1900, but find it hard to justify adding one as it is so close to my existing Beomaster 2400.

Speaking of which, today needs to be the day that I add the 2 missing DIN pins that Martin sent me to see IF my Beomaster is indeed a 2400-2 and will remote control my “teacher’s pet” Beogram 4004. (It has never caused a single problem in 8 years!)

Sounds ridiculous, but I have been putting it off out of fear that it won’t work. Time to act like an adult…..

Jeff

P.S. For this and other forums the auto-notifications are not coming through for me, so if I fail to respond it is only because I am unaware of a posting.

My son has a BM 1900, and I wanted to see the differences to BM 2400, so I made a wild bit on Ebay and got it cheap, it will probably be a give away, I have BM 2400 and BM 3300, and with the Beolab 5000 coming it is too much now. My biggest wish now is a BG 3000 Thorens this wish always comes up when the virus is in full bloom

Hi Søren,

Not to take away from this posting, but I added the 2 DIN pins and although the remote functions all work like “magic” now I have a terrible hum where I didn’t before.

Any ideas?

And yes I posted this on the workbench, but frankly, the more “eyes” that see this issue, the better shot I have at finding someone with a solution to this annoying hummmmmmm.

Jeff

Could work a little yesterday, as it was Sunday I also had to cook a little, so I just got started.

Main board 1/3 done, I finished it today with Matins marvel kit, as you see I am cleaning off the dust with a soft brush as I go. I also check the ESR as get the caps out, I have never found so many caps totally out of specs in any of the BMs I have made until now. I finished the main board today Monday.

I will have to change these 2 big ones too, one is inside limits, the other one slightly above, no problem, I can buy them down on the corner. I will then check the trimmers and Darlingtons to see if a change is needed. This BM stinks as if it has been stored in a stable (pigs I think) but slowly it get right odor of fresh soldered electronics, The virus kicks in as I go, Its maybe a keeper and not a give away.

Finished the caps (some 60 pcs.) also the 5000 uF (is now 4700 uF) everything clean, put the main board back in place, changed all the lamps and put the lamp assemblies back in place. Ready to test and adjust.

New lamps in ready to be soldered

Ready, easy and fast work. old ones out then the wires from the new ones into the holes, clip on, adjust placement turn around and solder.

Connected my DMM to the 15V supply, connected the power plug turned on the main switch, Stand by lamp on, touched the FM pin, DMM showed 14.9V, thats spot on. Turned off, connected the DMM over R256, turned on again, after 20 seconds a small smoke signal appeared in the left channel area near or at the IC 200 (TIP 141) and the BM went on standby. IC 200 was very hot, I desoldered IC 200 and yes it was bad. Found a used but good TIP 141, checked all transistors and diodes (on board) in the end stage near IC200, cross checked with IC 300 circuit the TR 207 showed different from TR 307, I desoldered TR 207 and tested it off board, it tested OK, put it back in. Soldered the IC 200 in. Connected main on, standby light on, touched the FM pin, the BM turned on all lamps on and immediately went back to standby. I have now checked all transistors and diodes in the end stages and fault switch all with diode tester and on board, but find nothing wrong. So now HELP IS NEEDED

Hi Søren,

Rest assured that help is on the way. I wish I could be of assistance, but as you know, you are WAY over my head….. but fortunately we have guys with real expertise here at BeoWorld.

Like you, I look forward to their solution. 🤒

Jeff

Sorry about that. Not at home today Søren, but I will look into it when I'm back.