From the analysis of the failure phenomenon, the machine has access to protected status. First on the CPU operating conditions (power, clock and reset) to check and found no abnormalities. Then check the voltage of 37 feet and 38 feet, was found 37 feet voltage is much lower than normal (only about 2.2V). It can be seen, 12C bus system is faulty, causing CPU protection. Using the controller circuit method is to check on the bus, when disconnecting the memory IC1102, 37-pin voltage returns to normal, judging memory corruption. After using the memory to replace the original offer, troubleshooting.RBSservice manual download site
 RBSservice manual download site

     Note that you can not use a commercially available blank memory replacement.RBSservice manual download site