Yingang YG125-25, Руководство по обслуживанию

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YG125-25 Maintenance Manual General remarks of electrical system
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General remarks of electrical system
Precautions for circuit inspection System principle and composition
Precautions for circuit inspection
1. While disengaging or engaging the patch plug, turn the ignition switch to OFF position, otherwise the electrical
elements may be damaged.
2. While checking the circuit, use a stylus that can be inserted from the front and rear ends of the connector and can
contact the terminals reliably.
3. To carry out the line on/off inspection, turn off the power supply and the related electrical elements.
4. To carry out inspection with voltage, check the accumulator voltage first.
5. In case of electrical system failure, diagnose according to the following steps:
A. Observe the failed behavior to determine which sub-system fails.
B. According to the circuit schematic drawing, use the process of elimination (POE) to narrow down the possible
failure scope.
C. Check the sub-system line for open circuit, short circuit or wrong connection.
D. Check the related components for failure or damage.
6. While looking up the line failures, check where the removal is convenient first following the principle of “searching
from easy to difficulty”. Both the parameter detection method and the parts replacement method are acceptable.
However, if the parts replacement method is used, you should confirm whether or not overload has occurred in the
line, as this may damage the new spare parts.
7. A multimeter must be permanently available for the circuit inspection.
8. Most of the instant electrical failures are caused by cable connector or electric wire failure.
System principle and composition
The electrical system is an important guaranty for the motorcycle’s running, safety running, reliable running and
efficient running. It involves many aspects, including contents of several subjects, including electric machine,
electrical, electronics, computer, electrochemistry, acoustics, optical material, etc. The development of electronics
will especially influence the motorcycle’s electrical system significantly. YG125-30A’s electrical system uses a lot of
advanced vehicle electronics technologies that are much more complicated then the traditional motorcycle. It
comprises the following sub-systems:
• Power supply system
• Starting system
• Engine management system
• Illumination signal system
• Information display system
We shall give detailed explanations separately in the following sections
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