Ryobi RY48ZTR75 Service Manual page 38

TESTING SECONDARY BLADE CONTROLLER
Test for short circuit:
1. Disconnect all connectors to Secondary 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.
Nominal resistance: 1.45M Ohms
Check for resistance controller output:
1. Set DMM to Resistance Mode.
2. Check continuity between any two terminals.
3. Check continuity between two other terminals.
Nominal resistance: 18K Ohms
Test Power and Ground to output circuitry
1. SET DMM to "DIODE"
2. Connect black lead of DMM to heavy black wire (ground).
3. Sequentially connect the red probe wire to each pin. Meter
should measure "open".
4. Connect black lead of DMM to heavy RED wire (ground).
5. Sequentially connect the red probe to each pin (diode test .4V).
6. Meter should measure approximately .48V.
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Note: Primary Controller is identified
by large square connector (see
previous page).
Secondary Controller does not have
this connector.