Ryobi RY48ZTR75 Service Manual page 22

TESTING THE RMO SWITCH
1. DISCONNECT MAIN POWER FROM MOWER.
2. Set DMM to "Diode" mode.
3. Touch leads where indicated. LED should light (polarity of
probes does not matter).
4. Set DMM to Resistance mode. Switch is normally open
(N.O.). Measure continuity when button held in. Measure
high resistance when released.
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2.5V
5-6V