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New repainted Quad chassis-parts are available Aug See http: Some 2N’s and BDC’s arrived today and I worked slowly and carefully, removing the old and replacing them with the new. A friend helped me to diagnose the db242 channel on my Quad MK1 and the problem was traced to one of the Toshiba 2SD’s.
Datasheets history of inquiries : Datasheets for Electronic Components and Semiconductors
Thank you and best regards to all assisting me here. What could have gone wrong? Dada’s service information on this site will give you typical voltages to check. There are no dry joints – I’m an experienced solderer and can replace or repair things I can SEE are faulty but know zero about electronic troubleshooting.
The amplifier is well-ventilated with nothing on top. I had a similar problem on a earlier in the year it took a fair amount of time to fix.
I did not have a replacement 4A fuse in stock and replaced the blown item with a similar sand-filled 3A fuse which also blew immediately. Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly. Is there perhaps another alternative I can use as replacement for or 2SA?
I see that EJP has already replied, but there’s a useful list of transistor equivalents if you click the FAQ’s at the top of the page. I have a variac and your recommendation to to look at R8 is very useful.
Even replacing dtaasheet these caused TR9 and 10 to blow again. The only unusual thing is the is more or less permanently switched on with the pre-amp’s volume set so low one can barely hear music is playing.
Btw, I don’t think I have blown components. An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. Which of his recommendations datqsheet first choice, if any? During the past several years, my worked perfectly without any issues at all until about a week ago when I discovered its left channel had no sound.
I’ll have a look and do some measuring. So you will need to replace there, with MJ Enter Word Verification in box below. Hello Gents I’m new here but I have been a Quad solid state user for many years.
I removed the top cover and discovered one of the sand filled? The reason being that I now live alone in a big house after the death of my wife in January this year and I leave the system switched on due to previous house robberies here, hoping the system’s sound will deter more break-ins at my house. The same thing happened – the same fuse blew again. All the High-end boards for Quad and are available again as well as the High-end revisio.
Where else can I look or measure, please? Apologies for not keeping you up to date about my MK silent left channel. Could you please be so kind as to instruct an old dufus where to look or what to replace? The same local ZAR source was supposed to get back to me about replacements for the ‘s since the 7th October but she never did. I am a phono cartridge maker and don’t know too much about amplifier electronics but I can help myself in a basic way.
But the next question is why? Apologies for asking for some assistance in my very first post.
Datasheet search «BD242*»
I have to buy some 4A fuses today and will post here re the diagnosis. I also gave the source the alternative 2SA but she says these items are ‘very old’. Well I didn’t mean to imply you dahasheet it personally, but it has undoubtedly happened somehow.
I then replaced the 4A fuse which kept blowing, connected the to its pre and switched on. New Blog articles Sep Esmond made new posts.
BD Datasheet(PDF) – Mospec Semiconductor
My friend researched some replacement data sheets for me and recommended the following replacements: I have been unwell for many days with all kinds of flu datashdet. After looking carefully, I can see no other overheated part or burnt wire anywhere.
Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1. Thank you Mr Pye.
My problem happened to be R8 but my bd422 was that any component failure in the initial stages datasheett manifest itself with further component failure at the outputs. At the time, I also replaced some smaller capacitors where I could reach those.
Check with a multimeter across collector the case and the emitter pin. Whereas amplifiers like the are AC coupled the being DC coupled can be much more difficult to repair. Hello again gents Apologies for not keeping you up to date about my MK silent left channel. I’m new here but I have been a Quad solid state user for many years.