Mindray VS-800, Service Manual

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Machine Disassembly/Assembly and Troubleshooting
4-17
Cannot start
Check if the AC indicator
is lit
Check the keypad-to-main board signal line for fault ；
Check the keypad-to-power board signal line for fault;
Check the keyboard for fault
Check the main board for fault;
Check the power board for fault;
Check/replace the
above units one by one
so as to locate the
fault;
Check if the power
supply is normal
Y N
Check the AC power
cord is norma
l
Y
Check the keypad-to-power board signal
line for fault;
Check the keyboard for fault
Check the main board for fault;
Check the power board for fault;
Y
Check if battery is
installed;
Check if the battery
has electricity;
N
Y
Y
N
N
N
end
Figure 25
Black Screen Troubleshooting Map
4.3.2 LCD Black, Backlight Off
1. Check if the LCD signal line is in good condition;
2. Check if the keypad power cord is in good condition;
3. If the problem still remains after the connection cables are replaced, replace the
LCD module:
4. If the problem still exists, check the keypad, power board or main board.
4.3.3 LED Displays Abnormally
1. Check if the LED signal line is in good condition;
2. Check if the keypad power cord is in good condition;
3. Check if the button signal line is in good condition;
4. If the problem still exists, check the keypad, power board or main board.
4.3.4 Alarms Soundless
1. Check if the sound is turned off in the software setup;