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IBM PC XT/370 Maintenance Guide
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== Safety Warning == The XT/370 PSU is the standard '''IBM 130 W switching supply''' used in the 5160 XT, containing mains-rectified bulk capacitors that hold a lethal charge after power-off. Before any work inside the chassis: # Power off and unplug the mains lead. # Wait at least 30 seconds. # Discharge each PSU bulk filter capacitor through a 1 kฮฉ / 5 W resistor. # Verify with a multimeter. Display: standard CRT (IBM 5151 monochrome or 5153 CGA) โ discharge the CRT anode separately before any work on the deflection / flyback board.
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