Ryobi Homelite RY48ZTR75/100, Manual

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Table of Contents
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WARNING 3
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ZTR Mower Overview 4
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Brushless Motors 5
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Using this Manual 6
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ZTR Block Diagram and Control Flow 7
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Troubleshooting: General 8
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Troubleshooting: Detailed 9
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DMM and Other Tools 10
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Component Locations 12
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Controller and Label Locations 13
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Main Battery Connection 14
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Testing Main Fuse 15
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Testing Battery Voltage 16
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Control Panel 17
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Testing PTO Switch 18
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Testing Headlight Switch 19
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Testing the Drive Speed Switch 20
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Testing Blade Cutting Speed Switch 21
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Testing Fuel Gauge / Hour Meter 22
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Testing Key Switch 23
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Testing USB Port 24
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Testing the Neutral “Zero” Switches 25
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Testing Headlight Assembly 26
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Testing Accelerator (angular transducers) 27
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Testing Brake Switch 28
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Testing Beeper 29
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Testing Seat Switch 30
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Testing Master Blade Motor Controller 31
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Testing Slave Blade Motor Controller 32
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Testing Drive Motor Controllers 33
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Testing Blade Motors 34
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Testing Drive Motors 35
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Testing Drive Motor Hall Sensors 36
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Testing 48V-12V Converter and fuse 37
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Testing Relay 38
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Testing Relay Diode 39
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Testing Charge port and interlock 40
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Testing the Battery Charger 41
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Battery Charger Error Codes 44
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ZTR Beep Codes 45
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Testing the Temperature Sensor 46
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Wire Harness 47
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Pre and Post-Repair Checklist 48
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Electronic Tips for the Mechanical Small Engine Tech 49
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Electronics Terms, Symbols and Tools 50
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Using the Digital Multi-Meter (DMM) 51
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