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strange issues, cr-1020

roseskunk

roseskunk

Well-Known Member
hi guys, please help me out. i've got my yammie cr-1020 plugged in to my computer system (mac g5) to listen to computer stuff, dvd's, itunes, etc. there's nothing else plugged in to the back of the receiver except the audio out of the computer to the aux in of the receiver. when i turn the receiver on and the selector is aux in, i hear a high frequency pitch sound. if i switch the tuner button from fm to am, the frequency drops but is still there. when i turn the volume knob all the way to zero, the sound increases... any ideas? am i haunted? do i need to ground the receiver? the power cord for the receiver is plugged in to the wall. i'm stumped... oh, and after five minutes, the sound goes away completely... thanks in advance for any ideas!
 
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Try plugging something else into the AUX IN like a CDP or tape deck . I'm thinking you may have a possible impedance issue with the PC.sound card. My 2 cents...:D
 
I had a Pioneer receiver that screeched and it was due to voltage regulators overheating and creating a situation that the pcb was burned so bad it was not repairable. Open it up and look for overheated areas.
 
hmmm... nothing's too hot, it happens as soon as i turn it on... the sound is there even with the computer not plugged in to the aux in... nothing is plugged in, sounds like it's the tuner somehow... but makes the noise without the tuner being selected... actually the noise is there with any input selected...
 
Might try cleaning the input selector switch real good with deoxit ..A noisey regulator circuit or a preamp circuit-ocsillating amplifier.Start hollering for Merrylander...:yes:
 
We'll have to wait for Rob to chime in.

BTW: Roseskunk, it's sorta weird, but MY CR-1020 is plugged into MY G5. I also have a MAC-4100 and a CR-1000, and some AR-3a's (but the only Sooey I've got is a TU-217 for my Scott 299D). I feel like a stalker! ;)
 
roseskunk said:
hi guys, please help me out. i've got my yammie cr-1020 plugged in to my computer system (mac g5) to listen to computer stuff, dvd's, itunes, etc. there's nothing else plugged in to the back of the receiver except the audio out of the computer to the aux in of the receiver. when i turn the receiver on and the selector is aux in, i hear a high frequency pitch sound. if i switch the tuner button from fm to am, the frequency drops but is still there. when i turn the volume knob all the way to zero, the sound increases... any ideas? am i haunted? do i need to ground the receiver? the power cord for the receiver is plugged in to the wall. i'm stumped... oh, and after five minutes, the sound goes away completely... thanks in advance for any ideas!
Click to expand...

I had the same problem with my G4 plugged running into my pre-amp. It didn't make any difference whether I had selected that input or not. Sometimes computers can even do that when they aren't connected to the computer, just on the same circuit. I've had that problem too...
 
There is a cap on the relay board of both the 1020 and 2020 that is across the emitter of TR701, a 10mf/25V - left front of the relay board beside the 180 ohm 3 watt resistor. If that goes open it will oscillate like crazy. That may be your problem. Yes, I know, it is a right proper PITA to get at the bottom of that board.
 
the sound is most loud when i turn the machine on. makes the same noise whether the computer is plugged in to the back or not. the sound is lessened when i push the fm muting button. after a few minutes, it stops... weird. gotta love vintage! i'll see if the local guy can handle it, otherwise, rob, it'll be coming to you! i just hate shipping these things...
 
Roseskunk,
You are probably picking up noise from the G5's power supply. Just like any other switch-mode supply, it will make high-frequency noise. Make sure you are using shielded interconnects, and try moving the amp away from the Mac. Even though the G5's case is totally extruded aluminum, it will still leak noise.

I'm also sure you're aware your Mac has no soundcard, but impedance shouldn't be an issue, after all, a LOT of these things (I have one also) are used for all types of audio, even pro audio, applications. If you are using the front audio out jack, try the one in back and see if the noise changes or goes away. I'm not sure what quality the 1/8 inch stereo plug is that you are using on the audio out jack, but the Mac likes to have the plug be very precisely machined, and it needs to fit firmly, and not be even a fraction too short . . . (ok, the rest of you get your minds outta the gutter!:twak:)

. . .Anyway, you may also want to check the audio out setting in System Preferences. If the audio out port is turned all the way up, try setting it at 75% and see what happens.

Good luck!

Don
BT
 
thanks for all the input guys. the sound goes away after a few minutes, so in typical fashion, i'll most likely do nothing. or at least, very little. i'm in the middle of an old house redo, so money is tight and this isn't a priority... but i'm using the yammie because my pioneer is acting up and not giving me stereo, and my cr-1000 is crackling a bit... that leaves a few more. i guess that's the reason i keep all this old stuff around, back-up's for my back-up's...
 
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