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Joost’s recommendations to use a Variac when testing ‘s is good advice as one can bring the voltage up slowly.
What could have gone wrong? New repainted Quad chassis-parts are available Aug See http: Eventually the fault was traced to R8 being open circuit thus putting an incorrect voltage on IC1.
Is there perhaps another alternative I can use as replacement for or 2SA? But the next question is why? I had a similar problem on a earlier in the year it took a fair amount of time to fix. Btw, I don’t think I have blown components. Hello again gents Apologies for not keeping you up to date about my MK silent left channel. My problem happened to be R8 but my datashret was that any component failure in the initial stages could manifest itself with further component failure at the outputs.
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There are no dry joints – Dstasheet an experienced solderer and can replace or repair things I can SEE are faulty but know zero about electronic troubleshooting. 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.
Dada’s service information on this bd422 will give you typical voltages to check. The amplifier is well-ventilated with nothing on top. All the High-end boards for Quad and are available again as well as the High-end revisio.
My friend researched some replacement data sheets for dwtasheet and recommended the following replacements: I’m new here but I have been a Quad solid state user for many years.
At the time, I also replaced some smaller capacitors where I could reach those.
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I have a variac and your recommendation to to look at R8 is very datashest. 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. Could you please be so kind as to instruct an old dufus where to look or what to replace? I did datasheeg have a replacement 4A fuse in stock and replaced the blown item with a similar sand-filled 3A fuse which also blew immediately.
I have to buy some 4A fuses today and will post here re the diagnosis. Which of his recommendations are first choice, if any?
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Apologies for asking for some assistance in my very first post. So you will need to replace there, with MJ Even replacing all these caused TR9 and 10 to blow again. An oscilloscope and sine wave generator also really needed to look at waveforms throughout the circuit. Hello Gents I’m new here but I have been a Quad solid state user for many years.
The same local ZAR source datasheeg supposed to get back to me about replacements for the ‘s since the 7th October but she datasheeet did. I’ll have a look and do some measuring. The same thing happened – the same fuse blew again.
Thank you and best datashete to all assisting me here. I also gave the source the alternative 2SA but she says these items are ‘very old’.
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. Whereas amplifiers like the are AC coupled the being DC coupled b242 be much more difficult to repair. Some 2N’s and BDC’s arrived today and I worked slowly and carefully, removing the old and replacing them with the new. Thank you Mr Pye.