Testing Primary Blade Motor Controller - Ryobi RY48ZTR75 Service Manual

TESTING PRIMARY BLADE CONTROLLER
Test for short circuit:
1. Disconnect all connectors to Primary Controller.
2. Temporarily touch a wire between "+" and "-" wires to drain
capacitance.
3. Set meter to Resistance Mode.
4. Connect DMM probes to heavy red wire (power) and
heavy black (ground) wire to check for short circuit
Typical resistance: 1.46M
Check resistance of controller output:
1. Set DMM to Resistance Mode.
2. Check continuity between any two terminals .
3. Check continuity between other terminals.
4. Both measurements should be nearly identical.
Test Power and Ground to output circuitry
1. Set DMM to "Diode" mode
2. Connect black lead of DMM to heavy black wire (ground).
3. Sequentially connect the red probe wire to each pin shown above.
4. Meter should read "Open" for each pin.
5. Connect black lead of DMM to heavy RED wire (ground).
6. Sequentially connect the red probe to each pin.
DMM should measure approx .48V for each pin (indicating diode good).
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Note: Primary Controller is
identified by additional large square
connector as shown above.
Secondary Controller does not have
this connector