For some reason the front panel lights will not work on my receiver. All other functions work. The unit is about a year old. One day they came on mysteriously, then the next day they did not work again.
Any help will be appreciated.
The display on an amp has two components. A small Lamp (light bulb) A LCD display with a color filter. Normally when the display goes out the problem is with the lamp The lamp on my RXV 870 died after about 9 years of use. I called Yamaha and was able to by a replacement. The lamp is an odd voltage 14.5 if I recall.
Looking at the receipt i should have bought 3 for the cost of shipping. It cost about 10.00 cnd,
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Between the ground and the "PRD" pin of the CPU, there are three diodes: D503, D504 and D505. The first two seem to be useful to protect the CPU itself against any over-current. In case of short circuit or similar, these 2 diodes can easily blow out, and force to "0" the pin 139 voltage of the CPU ("PRD" pin, dedicated to detect any abnormal DC voltage from output transistors) This is the reason why the protection circuit shuts-off the unit, even if the faulty power transistors have been replaced
Diodes are normal surface-mounted 1SS355: I've replaced them with two 1N4146, and everything works perfectly now. Diodes are located in the "Function" board, at the left side of the unit: they are easily accessible
I've realized that the problems seems to be extremely common for this model, so I hope that this hint will be useful in several cases
Do you have the owners manual of this Receiver. If yes, then I can guide you the page numbers:
The memory backup circuits prevent the stored data from being lost even if the unit is set in the standby mode, the power cord is disconnected from the AC outlet, or the power supply is temporarily cut. However, if the power cut is more that one week , the parameter values will retun to the factory setting. If this happens, edit the parametets again.
Now you want to reset all parameters:
Use PARAM.INI ( see page 63)
First put the MEMORY GUARD to OFF position.
To go to the the above :
Make sure the OSD is displayed.
Set AMP/SOURCE/TV to AMP,
then press MENU to enter SET MENU
Reach Option mode/2
enter C) PARAM.INI
All the parameters where changes have been made from their original setting would be marked in Asterisk(*).
Make the changes required.
Hope this works for you.
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- Single item, or fixed. This unit will only operate the unit it came with - Multi function, this type can operate the unit it came with and a fixed set of other types. Normally the remote comes with a list of supported device it could work with. - Learning, the combine both a predefined list with the ability to learn functions by sensing input from the original remote. - Programable. These are the newest remotes that work like multifunction but the list is maintained by the manufacturer and down loadable from the web.
I would guess that the DVR has a multi function remote. If you can't find the specific Yamaha in the list, then try another brand, this could take a while.
Some multi function remotes have an option that allow a semi automatic configuration. You turn on the item and then using a special key sequence try to turn off the device. once the item turns off you should be able to control it.
If you can't the Yamaha has a learning remote. If you really want an easy solution try looking at a programmable remote. I just got a Logitech, (Harrmony). Life has never been so easy.
This set is getting old and is in the Archives section of the Yamaha consumer guide area. But, you can still download the owners manual if you need one.
If it is going into protection mode even when there are no speakers connected OR when the sound level is very, very low or zero it is not good news.
Yes, unplugging the line cord will cause the protection system to reset itself. But, if it shuts itself off again soon after rebooting it is a sign of bad grease in the output stages -- in all probability.
Let me explain: The audio output transistors are mounted to a large heatsink which keeps them cool during operation. They are electrically isolated from touching the heatsink by an electrical insulating washer. But, in order to keep them cool and allow for good thermal conductivity of the heat generated by the output transistors the washers are treated with a heat conducting grease. Over time this grease will dry out and lose its heat conductivity ability allowing the temperature of the transistors to rise; as the heat goes up they conduct more current and cause the protection system to activate and shut the set down (in order to avoid damage to the set).
That is the most common cause of your symptoms. However, there are several other possibilities, but I give this explanation a 90% probability based on my experience.