Specifications

Chapter 6 Troubleshooting & Maintenance RIGOL
Service Guide for DM3058
6-9
Inspection method:
Press the second menu operation key in the left side, and turn on the meter at the
same time. Keep pressing for about 5 seconds until you hear beep. After that,
multimeter starts testing display and a tip message on the screen
“Press ·Help· Key to Switch, Hold ·Help· Key to Exit” will be shown.
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 the brightness of LCD out of control, please enter into normal operating state
and adjust the brightness and contrast in the menu of “Utility” to verify the real
fault cause more. IF the brightness cannot be adjusted, which denotes there may
be something wrong about mainboard. If LCD can not shine, LCD module or
mainboard may have been damaged.
If bright point or scotoma occurs, the LCD module may be damaged.
Before replace the parts, please try to pull out the connecting line between LCD
and mainboard and reconnect and test to get rid of the trouble to connectivity.
If you make sure it was the malfunction of the screen, please contact RIGOL.
4. Keyboard
DM3058 utilize Keyboard self-check program to inspect whether its button and
backlight are normal.
Inspection method:
Press the first menu operation key in the left side, and turn on the multimeter at
the same time. Keep pressing for about 5 seconds until you hear beep. After that,
multimeter starts testing display. In this state, the basic measure keys, parameter
keys and trigger control keys would twinkle and the screen displays keyboard
testing menu. When you first press a button, the corresponding icon in the test
interface would change to reverse video, after this, the icon would vary with the
button you have pressed.
If no movement happens after you pressed the button, there may be something
wrong about button or relative circuit.
If the backlight of some or all buttons does not wink while you execute self-check,
that denotes there may be something wrong about backlight or relative circuit.
Before replace the parts, please try to pull out the connecting line between LCD
and mainboard and reconnect and test to get rid of the trouble to connectivity.
If you verify that it was the malfunction of keyboard, please replace a new
keyboard board or (and) rubber button.
Tips:
Some difficulties could be solved by recalling factory setup.
For example, parts of setup mistakes or Non-fault errors could be eliminated by this
way: