Question about Yamaha GX-505 CD Shelf System
Over a period of a few weeks, the volume control on the unit became intermittent, then failed totally to respond to rotational movement. The remote control works fine. Have removed volume control knob assembly from PCB (left body attached to PCB). No obvious sign of excessive wear on contacts (knob or PCB-attached contacts). Small amount of factory-installed grease relocated (to simulate new product). Re-assembled whole unit, problem remains (naturally...) Is problem most likely (or has experience proven): - volume control assembly worn out, needing replacement? - contacts (within control) needing 'repositioning', to ensure greater friction between surfaces? - analogue components (pull-up and/or pull-down) between volume control and digital IC failed? - digital IC failed (no longer 'reading' changes from volume control)? (All of the above?!) Thanks...
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Posted on Jan 02, 2017
hi, ya, someimes the POT i.e the volume controller variable resistor loses its contacts with the carbon strip. tru using some switch cleaning solution( NoN Acidic) to clean the POT,let me know
Posted on Dec 30, 2007
SOURCE: Volume control on unit
Unfortunately, it sounds as if the encoder is broken. The encoder is a digital input which takes the place of a traditional volume control, and is what holds the volume knob in place and spins. Since it works fine with the remote, that means everything else is ok, but you will have to replace, or have a tech replace, the encoder itself.
Posted on Sep 16, 2008
Guys, I might have accidentally found the problem because the fix worked for me :). I have the RX-V995 and for the last 2+years or so, I had resorted to getting up and using the knob manually for volume control. System will show 'voluem up/down' in the display, but the knob didn't rotate. Same problem as yours.
I was getting ready to buy the service manual, find the knob motor which I thought was the main culprict and replace with a new one.
So I took out the top cover (just a few screws), the front face-plate (again just a few screws. The inner details were all visible. The volume knob circuit board was vertically placed. They were all covered in a good layer of dust. I got my Dyson vacuum cleaner and gently and carefully tried to **** up all the dust that had settled down. With soft front brushes, I agitated the dust I couldn't reach with dyson wand direclty, once dust were loose, dyson did a great job even with picking up those last dust pieces.
I couldn't succeed in taking apart the volume knob circuit board, as I was still awaiting for the service manual. I put all the covers back on and guess what? I used my remote and the knob was moving again. Responding very well, the knob made the full turn, when I was on the remote. It has been working perfectly for the last few days now.
I think I know what was happening. Teh top of the RX-V (and I am sure many Yamaha receivers) are very porous to allow for good heat dissipation. Over time, this allows a large amount of dust to collect on top of the parts. Most parts are electronic (not mechanical) and hence don't get affected by the dust. But the few mechanical parts might have adverse affect if dust settles down in between the rotating mechanisms.
My volume knob had stopped responding to remote command, very slowly. Initially it worked a little, missed a little, then it missed a lot and eventually it didn't rotate. That proves the theory to some extent that if the motor had completely failed, it would stop working from the get-go, not intermittently. Dust build-up provided intermittent contact between the parts and hence the response was intermittent.
The dyson vacuum did a great job in pulling out those fine dust from such parts and amazingly, things are looking very good at present. Honestly, I hadn't the slightest hope that vacuuming would fix the problem. I had vacuumed to make it easy for me to work on the parts :).
So, it doesn't hurt at all to just give it a try. Do open the covers so that you can reach closer to the real boards and parts.
Good luck and let us know!!!
PN from San Jose, CA
Posted on Jan 28, 2009
The volume knob issue alone sounds like it's hardware-related and therefore not easily fixed. Also, since the remote appears to be working (the LED's are lighting up), but the unit is not controlled anymore, the IR sensor is probably faulty as well. I would seriously consider sending this AV receiver in for repair. If it's still within warranty, you shouldn't need to pay anything for the repair.
Manual for your receiver: http://www2.yamaha.co.jp/manual/pdf/av/english/re/RX-V1000.pdf
It's not much but I hope this helps.
Posted on Aug 21, 2011
SOURCE: I own a yamaha surround
The volume control in AVR receiver is a like press button switches. There will be two miro switches inside the volume control. When you rotate the volume control in the both direction the micro swtich get activeted and that will result in increase or decrease in volume. In you case the contact of the micro switch inside the volume control is faulty. It a common on problem to AVR, because we vocationally rotates the volume control, this will make the contact of the micro swich dirty. If you can do one thing Go to some electronic spare part shope near to you and buy a swich cleaning oil. Open the AVR's top cover and put two or three drops of the swtich cleaning oil to the top of volume control. rotate the control in both direction for some time. Then power ON the AVR and check is it jumps. If then also it make the same problem then you have to replace the volume control wit a new one . You can see the volume control behind the volume knobe.
Posted on Sep 05, 2011
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