Lose memory My receiver lose the memory after of power cord stay disconnected about seven days. Any body now where is the backup battery?

I do not know for your particular model. There are a dozens of these models in each of the manufacture type receivers. Not all of these receivers use a battery for backup.

If your reciever uses a battery for backup:
In most of these recievers the backup battery is located behind the front bezzle on the front control circuit board. On others it would be on the main circuit board. The battery looks like a small silver coin. Depending on the model, it can be a diameter of about 3/8 of an inch up to over 1/2 of an inch. In many cases the battery is a special type that has solder lugs spot welded to it. The battery would be available from the manufacture's parts and service rep for your area. You will need experience in soldering, and have de-soldering and soldering tools to change the battery in most of these receivers. The cost of the battery is usually in the area of about $6 to $10 depending on the type and rating.

If the reciever's memory uses a gold leaf capacitor:
In many models, they are using a gold leaf storage capacitor instead of a battery. The value of the capacitor is usually in the range of about 4.7 F to 5.5 F rated at 5V to 6V depending on the type. This capacitor is usually not a stock item from most generic electronics parts suppliers. The original should be available from the manufacture's service and parts rep. It is possible to order a generic type from most electronic parts suppliers. You must specify the electrical ratings for it, or an equivelent generic part number. You will need experience in soldering, and have de-soldering and soldering tools to change this capacitor. The cost of this capacitor can be in the area of about $8 to $20 depending on the type and rating.

If your receiver uses an EEPROM for its memory:
Many of these receivers use an EEPROM for the user set-up and memory settings. The EEPROM may be intergrated with the main uPC in many of the models. If this is the case and service is required, this will require proper troubleshooting to determine if the fault is actually the EEPROM section or some other support component. The EEPROM section in these receivers is usually not a socket-ed type IC device. It is usually soldered to the circuit board and it would most likely be a high density surface mount type device. In this case specialized SMD type soldering tools and the proper skills will be required to change this component. To perform this level of service, the factory service manuals, experience and training will be required.

The uPC/EEPROM would have to be purchased as an original part from the manufacture. It will contain internal firmware that is dedicated to the model of the receiver. Many times, they may recommend to change the complete circuit board rather than the IC itself.

After changing the uPC in many models of receivers, as like TV sets, there will be the factory level programing that is necessary to make the receiver work to specs. This will require the factory service manuals, training, and the proper calibration and setup instrumentation to do the task.


Jerry G.