42 SDG1000 Service Manual
Check the Main Board
If you want to remove the main board from the metal shelf inside the generator,
you’d better place it on a clean, insulated mat. In addition, to avoid some chips
or components on the main board being damaged for overheating, it is
essential to cool the main board whenever possible using a fan. Here are
procedures for testing the main board:
1. Several kinds of connectors including Fan Connector, Power Connector and
Keypad Connector are located on the main board. Check if all these
connectors are connected properly.
2. Make sure that the connectors on the main board are properly connected,
then connect the generator to AC power and turn it on. Check if the voltage
values at all test points are within the spec range using a digital multimeter.
The voltage parameters to be tested are listed in table below:
Table 5-3 Voltage parameters of the main board
If each tested voltage value is within the corresponding spec range referring to
the table above, then the main board works normally. Otherwise, the failure
may also come from power supply board except the main board, please return
the generator to the factory to have it repaired or contact SIGLENT.
In addition to power supply test points listed in the table above, the following
three signal test points are recommended for you to decide the main board
failure. Since the signal from these points is AC signal, you should measure
them using a digital oscilloscope.
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