Hello, I have this amplifier that does not turn on anymore, I opened it and I noticed that on the circuit connected to the power supply tray the 8-pin dual line integrated circuit signed U3 has exploded, the only letters I read are LN, it should be l switching power supply for standby, I kindly ask if anyone knows the exact abbreviation of this component, thank you.
There is no free download manual specific to this late model so I would guess it is similar to AZUR 650A. Both models are rated at 75W and probably use the same output power amplifier design, based on Sanken STD-03 Darlington devices. U3 however, is repeated on different PCBs and though it may appear to be the same OPAMP - it may not have the same function.
It would be very unusual for an 8 pin OPAMP to explode - except for one detail - there is more than one U3 and this it may be something else, like an optical coupling or decoding device associated with digital audio (IPOD) inputs and remote control devices. So check the PCB number /description - which PCB is the damaged U3 located on?
It would be very unusual for an 8 pin OPAMP to explode - except for one detail - there is more than one U3 and this it may be something else, like an optical coupling or decoding device associated with digital audio (IPOD) inputs and remote control devices. So check the PCB number /description - which PCB is the damaged U3 located on?
Standby power supply IC. That's typically what happens to them. it will need replacing and there are probably other components (a line side capacitor most likely) that will need attention
But what is the complete code of the component? Unfortunately the service manual cannot be found, other similar "Cambridge audio" products do not adopt this circuitry.
I would find out how many windings are on the small transformer. Two windings, it's LNK362-364. Three windings, it's LNK562-564. Id imagine the one with the most output power (the 364 or the 564) would be suitable in any case. I suspect as there is an optocoupler, this is going to be an LN36x
I expect you will want to check the small bridge rectifier, the 400V capacitor nearby, and possibly that optocoupler too
I expect you will want to check the small bridge rectifier, the 400V capacitor nearby, and possibly that optocoupler too
Hello,
While Cambridge audio does not sell service manuals for products still in production - so cheaper companies can not just copy their work, likely if you contact them with the serial number of your unit they would get you the number of the chip.
Worth trying anyway.
Greg
While Cambridge audio does not sell service manuals for products still in production - so cheaper companies can not just copy their work, likely if you contact them with the serial number of your unit they would get you the number of the chip.
Worth trying anyway.
Greg
Looks like a 'clean' fracture.
Maybe with some luck the rest of the top might still be in the chassis somewhere.
If it is it might be readable.
Maybe with some luck the rest of the top might still be in the chassis somewhere.
If it is it might be readable.