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IBM 5110 Maintenance Guide
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== Safety Warning == The 5110 PSU is a '''linear''' supply with large bulk filter capacitors that hold a charge after power-off. The 5114 Diskette Unit has its own separate linear PSU. Before any work inside either chassis: # Power off and unplug the mains lead. # Wait at least 30 seconds. # Discharge each bulk filter capacitor through a 1 kฮฉ / 5 W resistor. # Verify with a multimeter. The internal 5-inch CRT carries high voltage on the flyback transformer and anode. Discharge the CRT anode to chassis ground via a high-voltage probe before any work on the deflection / flyback board.
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