M---
New Member
Hi all,
I picked up a Harman Kardon 730 Twin Powered receiver for $30 at a garage sale this weekend. She's a little rough around the edges (a few scratches on the case, a chip out of the top corner of the glass, couple little dings on the faceplate, and the Tape Monitor 2 switch is missing its aluminum cap.
When I hooked her up yesterday, I was initially disappointed-- with my iPod on Aux 1, the left channel was OK, but the right channel was dead. With the volume cranked all the way up, I could hear some faint sounds, like headphones with the volume maxed out. Then I flicked it over to FM, and I got nice clear sounds from both channels. So I plugged my iPod into the Aux 2 input, and I have great stereo sound! Both channels are working beautifully!
But the pots were all scratchy, so today I picked up a can of MG Nu-Trol control cleaner, sprayed it into the pots, and into the selector switch, and worked them all. While I was at it, I noticed that one of my fuse-style bulbs is missing... Maybe this is my opportunity to go LED for the backlights?
The pots are all working beautifully now-- no scratchiness! :thmbsp:
...But I'm disappointed: I've lost the right channel for all inputs. Aux 1, Aux 2, AM, FM are all missing the right channel. All I get is that faint sound like headphones that are turned up loud. :tears:
Can any of you suggest any hints as to where I should start my search for a problem?
I think I can rule out the volume control, since the faintness turns up and down. Same thing for the balance control, since the right (however faint) does fade in and out smoothly. I can't tell if the bass/treble controls are working on the right channel, because the sound is so minimal.
Sigh, I guess my project for tomorrow will be to flip her upside-down and trace the input selector switch.
Once I get it fixed, then I'll be on to the next task: finding a new cap for the Tape Monitor 2 switch. And grinding out the little crunch in the top edge of the acrylic face. And buffing the front face of the glass so that she shines. Maybe I'll go LED for the bulbs, rather than replacing the fuse-style lamp (those things are expensive! And I haven't even found the right voltage of bulb yet! ...But unfortunately the amp is feeding the light panel with AC).
...And I've got to figure out what to do with my previous receiver, a Sanyo 2050 in absolutely pristine condition. Wife says to sell it, so that's probably what I'll do, but it's a shame because it's in perfect shape, just one faint scratch on the aluminum top edge.
I picked up a Harman Kardon 730 Twin Powered receiver for $30 at a garage sale this weekend. She's a little rough around the edges (a few scratches on the case, a chip out of the top corner of the glass, couple little dings on the faceplate, and the Tape Monitor 2 switch is missing its aluminum cap.
When I hooked her up yesterday, I was initially disappointed-- with my iPod on Aux 1, the left channel was OK, but the right channel was dead. With the volume cranked all the way up, I could hear some faint sounds, like headphones with the volume maxed out. Then I flicked it over to FM, and I got nice clear sounds from both channels. So I plugged my iPod into the Aux 2 input, and I have great stereo sound! Both channels are working beautifully!
But the pots were all scratchy, so today I picked up a can of MG Nu-Trol control cleaner, sprayed it into the pots, and into the selector switch, and worked them all. While I was at it, I noticed that one of my fuse-style bulbs is missing... Maybe this is my opportunity to go LED for the backlights?
The pots are all working beautifully now-- no scratchiness! :thmbsp:
...But I'm disappointed: I've lost the right channel for all inputs. Aux 1, Aux 2, AM, FM are all missing the right channel. All I get is that faint sound like headphones that are turned up loud. :tears:
Can any of you suggest any hints as to where I should start my search for a problem?
I think I can rule out the volume control, since the faintness turns up and down. Same thing for the balance control, since the right (however faint) does fade in and out smoothly. I can't tell if the bass/treble controls are working on the right channel, because the sound is so minimal.
Sigh, I guess my project for tomorrow will be to flip her upside-down and trace the input selector switch.
Once I get it fixed, then I'll be on to the next task: finding a new cap for the Tape Monitor 2 switch. And grinding out the little crunch in the top edge of the acrylic face. And buffing the front face of the glass so that she shines. Maybe I'll go LED for the bulbs, rather than replacing the fuse-style lamp (those things are expensive! And I haven't even found the right voltage of bulb yet! ...But unfortunately the amp is feeding the light panel with AC).
...And I've got to figure out what to do with my previous receiver, a Sanyo 2050 in absolutely pristine condition. Wife says to sell it, so that's probably what I'll do, but it's a shame because it's in perfect shape, just one faint scratch on the aluminum top edge.