Hello all! I am repairing my K2000R synth. When I turn the unit on, it states it is initializing battery backed memory. But the battery is fine, even I do get a low voltage indication at times. When I quickly turn it off and back on, it boots up successfully without going through the memory initialization. At first this was an intermittent problem. Now it is a consistent headache. I replaced the diode pair that permits the battery to power the memory chip when the power is off. There is also a transistor that I changed which a part of this circuit. It brings the +5V power line up when unit is switched on and cuts off power from the battery. There is a capacitor that permits changing the battery without losing what is in memory. I do not think this is the problem. What is left is the memory chip(s) and the battery sensing circuitry. Either something is a drain on the battery which recovers when the unit is turned on, or there is a problem with the battery sensing circuit. If the former was the problem, the battery probably would be dead by now. Any ideas? How is the unit sensing a need for memory initialization to factory defaults? Looking for a signature in the memory itself? Or sensing the low batter voltage? Perhaps there is a better Usenet group for this question? Thank you! Bob Graham
