Ryobi RY48ZTR75 Service Manual page 43

TESTING 48V TO 12V (DC-DC) CONVERTER
Testing Converter Fuse:
1. DISCONNECT MAIN POWER.
2. Check continuity of fuse.
3. If fuse is bad, replace only with same type and Amperage.
Testing Converter:
1. Turn mower on. Set DMM to "Volts"
2. Measure ~48V between Red and black wire as indicated.
3. Check for 12V output at blue and yellow wire.
To test Converter Module Independently:
1. Apply 48V "+" to Red AND Yellow wire.
2. Apply "-" to black wire.
3. Check for 12V output at blue and green wire.
Note: Red and Black are 48V input Blue and green are 12V output
Yellow is a control wire (48V) to turn on the output
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