Posts by AntonvZ (archived2)
33 total posts31 results
Beomaster 4000 model 2406 resurrection
in Imported Content (Unmapped) · Feb 28, 2021 17:03How to measure Darlington Transistors with a DMM? Well from what I've read you can't really do that. The Darlingtons MJ3001 and MJ2501 both contain resistors and can apparently only be tested in a circuit to see if they …
Beomaster 4000 model 2406 resurrection
in Imported Content (Unmapped) · Feb 28, 2021 16:28[quote user="fkatze"] Is there a short in your output transistors? [/quote] Thanks, used that as a starting point. First desoldered all the wires connecting board 8002095 to the Darlington board. Desoldered from 8002095 …
Beomaster 4000 model 2406 resurrection
in Imported Content (Unmapped) · Feb 24, 2021 11:57I was picking up some Beovox P45's from a 2nd hand dealer when I saw the BM4000 lying in a corner. "How much for that" was answered with "It won't even turn on, take it if you want it". Of course it went home with me and…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Jul 29, 2020 15:28Hi Grissa, unfortunately have no detailed images of that part of the Beomaster from when it was disassembled and before I started replacing caps. Suggest you hunt around on the web and in this forum. If you go through my…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 13, 2020 19:35[quote user="manfy"]you just need to adjust the idle current for the amplifier[/quote] Solid at 24mV [quote user="manfy"]unlikely that there is something wrong with the input wiring, particularly since the left channel i…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 13, 2020 18:37[quote user="Dillen"]They were very good quality (I see them often and I rarely replace them).[/quote] Like my original post said this set has been in my family since new so they are definitely originals and I am sure th…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 12, 2020 21:07[quote user="Dillen"] Glad to hear, that my suggestion regarding the two zeners and BC154 was right. Now perhaps a shorted 902 (100uF) or 904 (Zener) [/quote] Snap - bit of a cross post there (-: Indeed you were right as…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 12, 2020 21:00[quote user="AntonvZ"]Now I'm onto the next mystery - where has my 9V supply gone for the radio circuit?[/quote] Well the 13 hour post approval lag gave me time to figure that out and replace the other zener diode #904. …
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 12, 2020 11:46[quote user="manfy"]Yes, I think BC161 is a good choice here[/quote] Well Manfy you rock, thanks to your help and suggestions the power circuit is stable at 30V 🤩 It was the "BC154" that was the culprit, the moment the …
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 10, 2020 10:29[quote user="manfy"]BC214, huh? You like to live dangerously, don't you?[/quote] 😮 Erm ...... yes but not with audio equipment - thanks for the warning! So as you first suggested 🙂 rather go with the BC161 as that can …
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 10, 2020 08:56[quote user="Dillen"]Beovox 2705? Sure they are not 2702?[/quote] 2705 for sure, will put up the sticker later, 25w RMS 45w peak. Exactly the same size and grill type as my Beovox 1200's, just in teak and not rosewood. Q…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 10, 2020 08:15[quote user="manfy"]If you don't have a BC154, the replacement model is BC416 (so says the internet). If you can't find BC416, you might try the BC161. BC161 should work fine for this purpose and since you fixed your pre…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 9, 2020 19:31Hi Manfy Checked again, diode cathode is connected to BC154 emitter. It is in the right way. BC154 on diode check , circuit off and unplugged I’m sometimes getting OL and sometimes 0.001V between emitter and collector. T…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 9, 2020 08:15[quote user="manfy"]At first look, I'd say you mounted the new zener the wrong way around, i.e. in forward direction. 😠 No worries, it's no biggy. The 3.3k resistor in series should limit the current to just 13mA, which…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 9, 2020 07:32[quote user="Dillen"] Is the trimmer slider ("single pin side") connected to the BC154 base at all? Is the emitter resistor (910 / 3,3K) OK? Martin [/quote] Confirmed : Single pin side of trimmer is connected to BC154 ba…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 7, 2020 20:43[quote user="manfy"]Check the Zener diode 908. You should normally read 21V on the cathode - in your case it should be 30.4V since you get 39.4V on the collector of 2N3055. If the diode is ok, check transistor BC154 and …
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 5, 2020 07:56[quote user="Dillen"]You can use a 2N3055 if you don't have a 2N5034 . You will have to adjust the voltage regardless.[/quote] Hi Martin Thanks as always. Swopped out the 2N5034 with a 2N3055. Update and Edit, just to se…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 4, 2020 10:31[quote user="Dillen"]Points to a problem with one of the output stage transistors or, perhaps most likely, one of the driver transistors.[/quote] Hi Martin Still having a problem with getting 30V stable. Adjusting trimme…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 2, 2020 15:23So now for the next set of issues. 1. Stable voltage is now sitting at 40.8V iso 30V. Adjusting the trimmer has no effect whatsover and this is a new one. 2. My original problem. The RIGHT preamp channel (QII) is dead. e…
Beomaster 1000 model 2318 repair project
in Imported Content (Unmapped) · Mar 2, 2020 15:00Update The left channel has sound again ! 🤩 First my thanks to Martin, without his help I'm very doubtful I would have found the problem so quickly. It was indeed the left channel transistor U2734 (hard to find specs on…