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IBM 3270 PC/G Maintenance Guide
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== Opening the IBM 5278 Display Attachment Unit == The 5278 is a separate enclosure roughly the size of a small lunchbox. It contains: * Its own '''linear power supply''' (separate mains cord). * '''Vector graphics processor''' driving the 5279 monitor. * Frame buffer RAM. * '''75-pin connector''' to the 5279. * Input connector from the 5371's Display Adapter. To open the 5278: # Power off and unplug both the 5278's mains lead and the 75-pin cable to the 5279. # Wait 30 seconds and discharge the 5278's bulk caps. # Remove screws around the perimeter of the case. # Lift the cover.
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