Powers up with +32V AND -32V but no output.
Cannot find a schematic anywhere.
Help please
Tony
Cannot find a schematic anywhere.
Help please
Tony
-
-
Re: Cambridge Audio Amplifier P25
Hi Tony I'm strictly hobbyist level, but I've managed a few successes with amps, CD players and DAB tuner. I looked out a P25 Mk11 I got YEARS ago not working. I thought I'd tried all permutations of inputs and knobs, but today after finding a couple of basic issues it burst into life with a beautiful sound through just a pair of Sony speakers from a 'stereo'! Previously I'd replaced the TL072 op amps and re-soldered a leg of C712 that seemed to have been missed originally. I am left however with probably the original fault where there's no output in the 'normal' setting but perfect in the 'direct'. The 5532 op amp shows a short through pins 5 and 6, but I assume (!!?) this would only affect the Phono input? I'm not sure how or if this relates to your post but just might prove yours isn't unique? Esp if you get the same result..... -
Hi, I've got a P25 MkII and, when moving it, must have crossed the speakers wires or similar. now no sound although it powers up.
Does anyone know if there's a fuse or reset button anywhere please ? Or a link to manual. Cheers - JoeComment
-
I have here a Cambbridge Audio Stream Magic 6 which does not power on.
When opening the case the PSU appears to be faulty:
IC1 (ICE3BR0665J), D2, the rectifier bridge, C15,C16 are dead and T2 is fried:
I found the schematics of the PSU in the cambridge Audio CXN Service guide which uses the same:
My problem is that I cannot find any info on T2 (SG01323) which seems to be a choke. Anyone knows how I can find a replacement & the value of that choke ?
Thanks very much in advance... -
The Problem: This player has a toggle switch to select between Stereo, Mono R, and Mono L. Regardless of the setting it outputs the sound to both the L&R audio jacks. In the Mono R position, the audio output level is normal (from both the L and R audio output jacks), in the Stereo position the audio output is about half the volume, and in Mono L, it's about 3/4 the volume. Something about putting it into Stereo mode is causing the volume to drop significantly and I can't figure it out.
The player processes the audio signal using two different reference frequencies. The "R"... -
Well for RF transmitters, transmitting without an impedance matched antenna and if the transmitter doesn't have automatic limiting... kiss the final transistor goodbye and chalk one up to something you killed.
But that's not the same way with audio amps for the most part, well, at least the wavelength of audio on copper is so long that you get all of it back anyway but the transistor is fine with it...
So how are people destroying finals in their audio amplifiers then? Heh.
Are people shorting their outputs or something, overdriving output to a too big speaker?... -
My childhood best friend was killed about 9 years ago. His parents are finally letting go of his things, and they offered me his Polk RTi100 tower speakers. The Polk RTi100 towers are one of a handful of designs from the early 2000s that is a full range 3-way tower with a built-in self-powered subwoofer. This is accomplished with a plate amp integrated into the speaker input panel.
I think they used them for a while, but they've been sitting for at least a few years now. After about 40 hours of driving to their house and back (both they and I have moved in the last 9 years) I got... -
I found a project in the electronics trash yesterday. A nice Argon SA1 audio amp with some electrical issue. Took it apart and saw that the 4A250V fuse was blown so started lifting components to find the short. Eventually got to two MOSFETs (model FTA14N50C) that are shorted and when i took them out the short was gone.
Now i didn't have any replacements of the same model of course but i found a couple with pretty similar spec i thought (K10A60D & K12A50D) and put them in. Also replaced the blown fuse with a 3.5A250V one. Checked another time for short circuit and plugged it in....
Comment