Specifications

RIGOL Chapter 6 Troubleshooting & Maintenance
Service Guide for DM3058
6-8
AC 110 V
AC 110 V
AC 8.5 V
AC 17 V
AC 17 V
AC 9 V
Red
Yellow
White
Blue
Blue
Brown
White
Yellow
Black
Black
Figure 6-3 Transformer Sketch Map
Compare the measured voltages of each winding with the ones in Table 6-1, 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
(1) If all the winding voltages among original side are 0, there might be
something wrong with filter board or power socket.
(2) If the original voltage is half or double of the typical value, inaccurate
location might be selected by AC voltage selectors.
(3) 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.
3. Display
DM3058 utilize LCD self-check program to inspect its bright point, scotoma,
backlight and display control circuit.