Question about Yamaha GX-500B Shelf System

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Memory loss Hi, I have a problem with my Yamaha GX-500CD shelf system. (Not sure if this is the same as GX-500B) It's a great system, but in all the time I've had it, the briefest interruption in mains power wipes all the station memories. I had got to the point where I no longer bothered using the radio section (we live in an area prone to regular power outages) as it's an absolute shocker to reprogram. The other day, I noticed an item in the manual to say that it's supposed to hold its memories for a week! And given that it's actually quite a nice tuner, I've decided I'd like to try using it again. Now, I'm a radio tech and Ham radio operator, and I have the service manual, but at 60, my knowledge is a little (ok, a lot) out of date, and I cannot see HOW it's supposed to hold the memories. I can't find a battery or supercap anywhere, and would have expected non-volatile ram to hold the memories forever. Can you help, or tell me what to look for...? I have not, at this stage, opened up the unit. Thanks, Michael

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  • Yamaha Master
  • 5,515 Answers

See if you can find one of these capacitors. It's called a memory retention capacitor they are normally squashed looking things. Voltage ratings around 6 volts.
If you do replace it.


Memory loss - memory cap-xyepn11bn2dncju5oyjak0p4-1-0.jpg

Posted on Mar 08, 2017

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6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: remote control

hi, ya if u know the exact model no. of the remote you can buy a spare one from the manufacturer or any dealer, try searching it on the internet first.

Posted on Jan 03, 2008

  • 3 Answers

SOURCE: Yamaha NX-SW300 sub woofer

Yes, that type of connector is often used for a VGA signal for a computer monitor. But in this case it is an all-in-one connector Yamaha used in order to simplify the hookup of this home theatre system. Unfortunately, the subwoofer is only usable with the DVR-S300 receiver/DVD player.

Posted on Jun 11, 2008

  • 2 Answers

SOURCE: Looking for circuit diagrams for yamaha dx21

Have you managed to locate a DX21 service manual yet?? What problem are you experiancing with the 21?? From your request notes you mention 'all audio sections are live', do you mean that you have no audio from the 21?? Most faults i have experienced with the 21 are, failure of the main OPP YM2164 fm chip and associated D/A convertor(YM3102). In some cases YM3102 is ok .When the YM2164 fails, DX21 will boot as normal but no sound whatsoever from the audio out's. YM2164 is the main tone generation ic. Also when YM2164 is replaced, if sounds are reloaded back into the memory areas from ROM and the display reads gibberish in certain memory areas then a ram or rams have failed also. The crunch, Don't expect to get a YM2164 and Associated components easily, these things are very rare. I have seen the YM2164 fetch £35!! Best way around this, if you are eager to repair the synth is to purchase a working YAMAHA FBO1 FM MODULE ,not a popiular module and sell for about £20 - £50 on ebay. You can rip the parts out of the unit and use them in the 21. Sell whats left on EBAY spares or repairs.
The damaged (i believe) is caused by failure in the powersuppy causing voltage rails to 'spike'. What is strange is the cpu stays in tact. Capaitor replacements can cure this problem. I have a complete circuit diagram i can scan and email to you for a small fee for my time if required . email me:- proteus4@blueyonder.co.uk

Posted on Mar 08, 2009

smarthome2
  • 1114 Answers

SOURCE: Yamaha RX-V2500 completely shut down

Sounds like the volume control on zone 2 is your culpret. You should set up zone 2 to have a "fixed" output instead of "variable" it's in zone 2/3 setup. whats happening is you are overloading the volume control from the zone volume on the receiver and getting feedback to the receiver and shorting it out. What you do is put zone 2 to fixed output. set the vol control to 3/4 then adjust the vol to relatively loud and exit out of settings. this will be your max volume setting. Now, on to your problem.Unplug the receiver. There is an internal fuse that could have blown, not to likely but it's possible. You have to take the top off the receiver with a #1 phillips or a T10 torx they vary. It's about 7 screws, pop off the top and look from front to back, you will see 1 or 2 fuses near the AC plug port. Sometimes they are gray or white and you cannot visibly tell if it's bad. If you have a multimeter, set it tone resistance. Then put your leads on either side of the fuse, if you hear tone the fuse is ok. If not check your leads by touching them together and you will hear tone then test again. If you don't have tone, your fuse is bad. Radio Shack should stock the fuse you need. If you don't already know this, there are 2 Power switches for your unit. Front of receiver bottom left corner "Master Power" and normal Power switch "Main Power" check them both. If your fuses are good and power is good, you have bad transistors internally and it needs to go to service. check www.yamahausa.com support and service, and you can find the closest authorized service center to send it to. If you mail it out directly to the service center rather than taking it to a dealer, you will save some money and get it back faster. Lastly, pull your zone 2 volume control and look for black marks on it or white chalky substance. "oxidation". If you don't mind spending a little money on the system, hardwire the speakers thru and replace the volume control with an IR receiver. If you could control the zone from the zone by pointing the remote at the volume control you had an IR vol control. You really didn't need the vol part. Xantech or Proficient make good IR receivers that aren't too expensive and will keep this from happening again. If you need any more help, I am a Yamaha Dealer, let me know where your located and I can send you to a good service center. Just post a comment and I'll get you the info you need. Hope this helps

Posted on Jun 06, 2009

finish line
  • 207 Answers

SOURCE: power trim on 60 hp yamaha quit working

find the solenoid for the trim it will be a the engine or on the trim motor it self get a test lite and find the power wire on the trim motor and with someone pushing the trim button test the hot on the motor if there is no power it is the solenoid if there is power u my have a brush stuck in the trim motor itself but 99% of the time it is the solenoid u can tap the trim motor and see if that gets a result but dont hit hard

Posted on Jul 09, 2009

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