BCT-2000 Software and BCT-128 and BCT-256 User's Guide - Alber

17. Upgrading BCT-2000 SoftwareUpgrading the BCT-2000 software from the DOS to the Windows version involves the followingsteps. If you need assistance, contact Albércorp Technical Support.17.1. Replace the 87C52 ProcessorBefore the Windows BCT-2000 program can communicate with a BCT-128 or BCT-256 thatwas being used with the DOS BCT-2000 program, the 87C52 processor must be changed inthe BCT-128 or 256.1. Power down the BCT and disconnect it from AC power.2. Remove the six screws under plastic caps located along the sides of the BCT cover.3. Remove the cover.4. The 87C52 U21 processor is located in a socket on the right-most vertically mountedboard.5. At this point, the technician (you) should be connected to ground with a ground strap, oryou should discharge any static electricity by touching a grounded object.WARNING: Notice that the top corner of the socket closest to the front of the BCT isangled. You must align the angled corner of the new chip with this corner before installation.Failure to align the corners will damage the BCT.6. Using a PLCC chip puller, carefully remove U21 from its socket.CAUTION: The socket can easily be broken if you are not careful during removal andinstallation of the chips.7. Grasp the replacement U21 chip and install it in the socket, making certain that theangled corner of the chip is aligned with the angled corner of the socket.8. Replace the cover on the BCT, replace the six screws, and put the plastic caps over thescrews.9. Reconnect the BCT to power.72