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WARNING
WARNING
M3500B/M5500B Service Manual
Discharging the Defibrillator Capacitor
The steps that follow describe two methods of discharging the unit's Defibril-
lator Capacitor. Always employ the Primary Method, as it will work in most
cases. If there are any doubts, the Secondary Method should also be used.
Always discharge the defibrillator capacitor before servicing this unit.
To avoid completing a high voltage circuit, use only one hand to perform the follow-
ing steps. Keep the other hand away from the unit at all times. Do not touch any-
thing else but the parts described.
1. Carefully lift up the defibrillator capacitor together with its two foam cov-
ers. Lift straight up, then roll the capacitor and its covers over to the side
and lay them on their side on top of the Power PCA. Note the alignment
of the foam pieces around the capacitor. Also note that both foam pieces
are contoured to fit in the case only one way.
2. Inspect the Disarm Pathway, located under the Defibrillator Capacitor on
the left side of the Power PCA. The Disarm Pathway consists of 2 large
power resistors (Disarm Resistors), a red inductor, and the PCA traces
that connect them. See Figure 4-16 on page 4-28. Look for signs of arc-
ing or burning, damage to the resistors or inductor, blown traces on the
Power PCA, etc.
If the Disarm Pathway is intact, refer to Figure 4-16 and use the Pri-
mary Method below to discharge the defibrillator capacitor.
If you see any burns or damage, the Disarm Pathway may not be
intact. Use the Primary Method, then also use Secondary Method to
discharge the defibrillator capacitor.
Primary Method
Using the High Voltage Discharge Tool, first touch one end of the
a.
tool's brass bar to the current sensing resistor (the small loop of flat
metal).
Then pivot the brass bar so its other end contacts the exposed end of
b.
the disarm resistor.
Maintain contact at these two points for at least 5 seconds. The
c.
defibrillator capacitor is now discharged.
Opening the Sealed Case
4-27
4
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