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Cambridge Audio 640R 7.1 Channels Receiver Questions & Answers
Cambridge audio 640r surround receiver
Hi,
I know this posting is now more than 10 years old, but what the heck! Just wanted to know if the poster of this was finally able to fix this? I got the blue dot problem now in 2024 after using the receiver very sparingly for more than 10 years! The guy I bought it from said he couldn't fix it and quoted all kinds of problems. Just found a new guy that said he could analyze the receiver and fix it. Will have more updates soon.
Caimbridge audio amp right channel always dies
Stereo amps are two mono amps put together. So if you have a bad channel then you also have a good channel to compare it with. I suspect you have a faulty transistor. You can test it by proding the channels with a pen or your finger - touching plastic only parts. The two channels should buzz. If buzzs in the left then if you touch it in the right it should do the same. An alteration or change in the sound in the right and you have found the faulty part.It's nothing to do with the power supply section so keep away from that!
DC error Cambridge audio amplifier
For model AZUR 740A with random DC-error on display after power on.
Only several resets will be a solution, but not for long !!
Behind the rear panel is a small pcb with 2 relays
which switch the transformer AC output to the rectifiers of each amp channel
Relays are branded " MASSUSE", type ME-11,with a 12VDC coil,
contacts 8A / 250VAC
They are DPDT type.( double pole double throw)
Contacts will detoriate ( burned) after several years.
Replacing these relays by a good model ( Schrack i.e.) will be the final solution to
get rid of the DC-error problem and will save your speakers !!
The pcb can be removed without disassemling the rear cover, only the top cover is enough, but this is with very tiny TORX screws.You need a very small fitting tool.
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