Bought this amp as none working in the hope of an easy fix, I replaced all the capacitors and 2 resistors ( burn marks around their pins ) .
All was well until i heard a loud crack through one speaker and the amp powered itself off , I unplugged it , I’m just guessing now that it potentially be the output transistors which only have the chord markings so I can’t identify them, can I identify them by unsoldering them and then connect my peak atlas to the pins and the one retaining screw ( pen shows where they are ) they’re very difficult to get to ! I can see the printing on them but it relates to nothing.
All was well until i heard a loud crack through one speaker and the amp powered itself off , I unplugged it , I’m just guessing now that it potentially be the output transistors which only have the chord markings so I can’t identify them, can I identify them by unsoldering them and then connect my peak atlas to the pins and the one retaining screw ( pen shows where they are ) they’re very difficult to get to ! I can see the printing on them but it relates to nothing.
Well, no one can tell a darn thing, other than they are TO-3, from that picture.
And maybe the power supply voltage is between -+50 and 60 volts.
And maybe the power supply voltage is between -+50 and 60 volts.
Normally they were marked CHORD N or P. I have several PSUs and halfassed mainboards laying around. NOT easy to serve.
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Thanks RM 👍🏻
Kind of relates a little to their markings
SML CHORP 18D
B0003 BY
am I correct in thinking there will be 2 x npn and 2 x pnp ? Or 4 of the ones that you mentioned?
Kind of relates a little to their markings
SML CHORP 18D
B0003 BY
am I correct in thinking there will be 2 x npn and 2 x pnp ? Or 4 of the ones that you mentioned?
It depends on the version of the amp. The small one, the 600 have less, the bigger, the 1200 have more. I really can`t remember all details. I do, however, have a complete 3000 without PSU. With lots of MOSFETs.
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Yes this is the smaller 600 model , any idea what the matching npn transistor would be ( if needed )
Always gentlemen the folks at Chord Electronics. I remember a particular incident when I called and complained about some irate behaviour, by the amp, not the people. Some seconds later the guy said, "Well, all I can say is that the amp was not designed to behave like that".
You just have to love people who can give you such an answer.
Look at my picture, BUZ901 and BUZ906.
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You just have to love people who can give you such an answer.
Look at my picture, BUZ901 and BUZ906.
R
Oh ! That would explain why they changed it on the 650 .
I wouldn’t have a clue how to fix or diagnose psu issues so I may have to submit to a repair shop 😩
I wouldn’t have a clue how to fix or diagnose psu issues so I may have to submit to a repair shop 😩
I suggest you send it to Chord. A normal repair shop is not really suitable for this kind of work.
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