(e) Trigger the oscilloscope sweep to begin when the motor turns ON
and adjust variable resistor R36 to set the ON-time circuit for a five second sweep.
Close verification can be made using a storage-type oscilloscope. Adjust to within plus
or minus 0.5 seconds.
(f) Trigger the oscilloscope to begin when the motor turns off and
adjust variable resistor R35 to set the OFF-time circuit for a five-second sweep. Adjust
to within plus or minus 0.5 seconds. A storage-type oscilloscope simplifies
Steps (e) and (f) above may be monitored at various points. For simplicity
and convenience, the positive-voltage motor input should be used, and the
oscilloscope triggering slope set for the ON circuit, then reset for the OFF
PREVENTIVE MAINTENANCE PROCEDURES
Preventive maintenance checks and services (PMCS) are provided by the
equipment operator (EO) who regularly operates the equipment and a medical
equipment repairer who provides repair and troubleshooting capabilities. Table 2-1
shows the PMCS tasks, who performs them [equipment operator (EO) or medical
equipment repairer (MER)], and the frequency of performance.
Clean item (remove dust, lint, rust, etc.)
Properly store accessories
Visually inspect and perform operating tests
Lubricate casters with graphited oil
Perform leakage-current tests
Estimated average annual man-hour
AO = after operations; D = daily;
Q = quarterly; S = semiannually;
A = annually; Z = as necessary;
BO = before operation.
Table 2-1. Preventive maintenance checks and services procedures.
Do not overfill vacuum bottles. If simultaneous ac recharging and
external 12vdc operation is being employed, ensure the external 12vdc