Ryobi RY48ZTR75 Service Manual page 39

TESTING DRIVE CONTROLLER
Test for short circuit:
1. Set meter to Resistance Mode.
2. Connect DMM probes to heavy red wire (power) and heavy black (ground) wire to check
for short circuit.
Nominal resistance: 750K Ohms
Check resistance in controller output:
1. Set DMM to Resistance Mode.
2. Check continuity between any two terminals (heavy Yellow and heavy green for
example).
3. Check continuity between two other terminals (2 and 3 for example).
4. The 2 measurements should be nearly identical.
Nominal resistance: 20K Ohms
Test Power and Ground Resistance at output circuitry
1. Connect black lead of DMM to heavy black wire (ground).
2. Sequentially connect the red probe wire to each pin.
3. The measurements should be nearly identical.
Nominal resistance : open circuit
1. Connect black lead of DMM to heavy RED wire (ground).
2. Sequentially connect the red probe to each pin.
3. The measurements should be nearly identical.
Nominal resistance 10k Ohms
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