| jurb6006@gmail.com: Mar 23 02:36PM -0700 > I will. > Peter Wieck > Melrose Park, PA It also appears that the hi cut and low cut switches can cause a complete loss of signal. Remember since there is no big noise there is no DC involved. It also appears that some of the boards are plug in, all of those connections could be bad. For the switches, worjk them very slowly to find out if in the out or in position they lose it at any time. Also, wiggle the PC boards very slowly and see if you can duplicate the problem that way. Going fast doesn't get it sometimes. Also when you clean them, after some vigorous action, then go very slowly looking for any cutout or even distortion. I found an elusive source of intermittent distortion in one channel of a Yamaha receiver by turning the function switch very slowly, and this was after it had supposedly been cleaned already by someone else. And this was not the first time that going very slowly revealed an elusive intermittent. Fast action and brute force are not the best course of action here. |
| Chuck <ch@dejanews.net>: Mar 23 06:02PM -0500 >For the switches, worjk them very slowly to find out if in the out or in position they lose it at any time. Also, wiggle the PC boards very slowly and see if you can duplicate the problem that way. >Going fast doesn't get it sometimes. Also when you clean them, after some vigorous action, then go very slowly looking for any cutout or even distortion. >I found an elusive source of intermittent distortion in one channel of a Yamaha receiver by turning the function switch very slowly, and this was after it had supposedly been cleaned already by someone else. And this was not the first time that going very slowly revealed an elusive intermittent. Fast action and brute force are not the best course of action here. FYI Yamaha had a whole year of amps and receivers with intermittent source select switches in the 1990s which couldn't be repaired by cleaning. They were made by Alps and had to be replaced. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
| jurb6006@gmail.com: Mar 23 06:13PM -0700 >"Yamaha had a whole year of amps and receivers with intermittent source select switches in the 1990s which couldn't be repaired by cleaning." This was a Natural sound type with a silver front and wood case, analog tuner. Had the flat knobs for source and tape select. The switches were the linear type operated by some sort of cam gizmo from the knob. I remember on that unit the asked why he had to turn the volume up to like 11 oclock to get the same level as his lower powered Yamaha got at 9 oclock. I had to explain that if they made the linkage on your car so that it was floored when you gave it half a pedal, would it go faster ? That that is a feature, a better control that gives you better control. In this country people often confuse gain with power. The have the volume at 8 oclock and don't realize that some of them were at nearly full power at that point. Extra gain is nice but they took it too far. |
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