Rigol DM3000 Series - Page 92

RIGOL
Service Guide for DM3000 Series
6-8
Compare the measured voltages of each winding with table2.1, we can see that:
Table 6-1 Check Table of Voltages among Windings of Transformer
windings
Max(Vrms)
Min(Vrms)
Typical（Vrms）
Original
side
White-Yellow
132
90
110
White-Red
265
180
220
Vice side
Black-Black
10.8
7.3
9
White-Yellow
21
14
17
Yellow-Brown
21
14
17
Blue-Blue
10.3
6.9
8.5
 If all the winding voltages among original side are 0, there might be something wrong
with filter board or power source socket.
 If the original voltage is half or double of the typical value, inaccurate location might be
selected by AC voltage selectors.
 If the vice side voltage is less than the minimum value, short circuit might be
happened within mainboard. You can pull out the vice side socket of the transformer
from the motherboard (please cut off the electricity before operating), then test the
voltage in vice side. If the voltage is upturned, short circuit might be happened within
mainboard or transformer malfunctions.
If you make sure that it was the malfunction of Power frequency transformer, please
contact RIGOL.
3. Display
DM3000 series utilize homochromatic LCD, support Power-on testing.
Inspection method：
Press the second menu operation key in the left side, at the same time turn on the
multimeter, keep pressing for about 5 seconds until you hear beep. After that, multimeter
starts testing display within a tip message on the screen “Press ·Help· Key to Switch,
Hold ·Help· Key to Exit”.
Press Help button, the screen would switch between Full white (all pixel are bright) and Full
black (all pixel are put out).
Press Help button for about 2 seconds, the display return to normal measurement state.
If you make sure it was the malfunction of the screen, please contact RIGOL.
4. Keyboard
DM3000 series utilize LED backlight button design, which is more convenient and accurate.