SDG6000X Service Manual
75
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Check the Power Supply
Before performing the power supply testing procedure, please make sure that
the generator is grounded correctly through the protective lead of the power
cord. Take care not to touch or even disassemble the power supply module
without any safety precautions to avoid electric shock. Here are procedures for
testing the power supply:
1. Disconnect the power cord of the generator and then check whether the
fuse is good.
2. Connect the power cord and then turn on the generator. Focus on the Power
Connector (J13) on channel board, which contains 6 pins, from Pin 1 to Pin 6.
Since two of the six pins are ground wires, test the other four pins that are
marked respectively with blue, yellow, red and white, using a digital
multimeter, to check whether the voltage value is within the corresponding
specified range. The voltage parameters to be tested are listed in the table
below:
Table 5-2 Test Voltages of Power Connector
Voltage value
Pins
Error limit
20 V
VH+(red)
±10%
-20 V
VH-(white)
±10%
6.5 V
VL+(yellow)
±10%
-6.5 V
VL-(blue)
±10%
3. If each tested voltage value is within the corresponding specified range
listed in the table above, then the power supply is working normally. Otherwise,
please go to step 4.
4. Disconnect the power connector and redo step 3. Because of the removal of
the load, each voltage value error limit increases by approximately 20
percent.
Table 5-3 Test Voltages of the Connector After Disconnected
Voltage value
Pins
Error limit
20 V
VH+(red)
±30%
-20 V
VH-(white)
±30%
6.5 V
VL+(yellow)
±30%
-6.5 V
VL-(blue)
±30%
Summary of Contents for SDG6000X Series: SDG6022X
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