BACKUP BATTERY for STUDER A810

REPLACEMENT NiMH BACKUP BATTERY  for STUDER A810 micro-processor board 

This should be considered an absolute MUST DO! Don't let it get to the point that the battery has corroded the surrounding IC terminals. Replace every 5 - 7 years. Not a big ask really.

Why Bother - my machine seems to work?  When the backup battery fails, you lose your machines's audio calibration and it then runs on an emergency default approximate calibration data set. 

FACT: MOST A810'S HAVE A FAILED BATTERY AND ARE RUNNING ON THE FACTORY DEFAULT EMERGENCY SET OF DATA THAT SETS UP THE WHOLE AUDIO CHAIN INCLUDING BIAS AND REFERENCE LEVELS. 

How much better could these machines that are running on a rough default calibration be working once calibrated properly and then the calibration saved safely the way it should be?

I now include the kit shown here as part of the essential overhaul kit because of its importance. Over the years restoring Studer tape recorders, inevitably running the gauntlet and frustration of finding information and spares, the engineer in me has often asked the question.  “Why cant I just get a professional upgrade kit with all the bits and pieces that are really needed”?  Now you can.

 General Info About This Kit.  The kit contains specially sourced, new, freshly manufactured components from reliable manufacturers whom we have been dealing with for many years.

 The Nagravox A810 backup battery replacement kit contains:

• A new German or Japanese manufactured Ni MH  battery pack assembled in Australia.  The battery is tested, charged and dated by Nagravox.  We charge it using a sophisticated microprocessor controlled “burp” charger.
• DOES NOT contain replica cheap copycat batteries made in China - the later one generically available velly velly cheep, no work so long or so good!
• A set of AAA dry cells and holder with leads that is used to maintain the RAM memory whilst you change the main battery.

• A detailed set of instructions detailing how to do it and how to preserve your calibration data in three different ways to make sure! 

BATTERY REPLACEMENT.  The battery should be replaced as part of the micro processor board service and update.  Don’t let it get to the point shown in picture  where corrosion has started to set in.  You should replace the battery at least every 5 years. Earlier MP boards have a slightly different battery that clips into a clip which was later replaced with a more sturdy soldered in battery. Our earlier battery is supplied with flying leads so it can be securely soldered into place on the PCB like the later one.

GOOD IDEA In our battery kit we supply a temporary dry cell battery (2x AAA in a holder with wire leads). This is to maintain the MEMORY data (unique audio calibration for your machine) whilst you change the rechargeable battery. The idea is not mine but actually suggested by Studer. Use the batteries from this temporary battery after you have finished in your TV remote. Gee - I love multi purpose stuff!