44 SDG1000 Service Manual
Quick Guide for General Failures
The general hardware failures are described as below. Reading the following
information can help you quickly handle some easy hardware failures with
more convenience.
1. No start-up after pressing the Power button:
(1) Check if the power cord is correctly connected.
(2) Check if the power button is usable.
(3) Check whether the fuse has been burnt out. If the fuse needs to be
changed, please contact SIGLENT as soon as possible and return the
instrument to the factory to have it repaired by qualified personnel.
(4) Check if the power connector is properly connected to the main board.
(5) If the instrument still does not work normally, please contact SIGLENT.
2. The instrument starts up with a dark screen:
(1) Check if the power connector is properly connected to the main board.
(2) Test if the voltages on the test points marked “-5V” and “LED_ANODE”
are within the spec range.
(3) If the instrument still does not work normally, please contact SIGLENT.
3. No response after pressing any button or abnormal display of the
screen:
(1) Check if the two end of the connector between the keypad circuit board
and the main board is properly connected.
(2) If the instrument still does not work normally, please contact SIGLENT.
4. The output frequency measured on the oscilloscope is incorrect:
(1) Check if the frequency on the test point marked “T4” is correct.
(2) Refer to “Check the Main Board” or contact SIGLENT.
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