Lcd Background Adjustment - Mindray BA-88A Service Manual

4.9

LCD Background Adjustment

If the power board or CPU extension board is serviced or replaced, the LCD
background voltage might change. To ensure the voltage meet the requirement, it is
necessary to adjust it. The procedure for adjusting is shown as follows:
1 Install all the boards back and ensure all the connections are well connected;
2 Set the digital universal meter to volt measurement. Connect the connectors of
the universal meter to LCD background cable connectors. ("+" is connected to
red cable; "-" is connected to white cable). Turn on the power of the analyzer.
3 Observe the voltage result measured by digital universal meter, if the voltage is
within the range of 9.80V≤V≤10.10V, it meets the requirement; Otherwise, the
voltage should be adjusted by operating software. The procedure for adjusting is
shown as follows:
4 Click Maintenance on the main screen of the instrument. Select Maintenance
tab. Click Advanced and enter the password "analyzer" to enter the advanced
adjustment interface as shown in figure 4-14.
5 Click Optional to enter the advanced setting interface. Use "+" or "-"in Screen
brightness area to adjust the background voltage. Click "+" to increase the LCD
background voltage (LCD background is brightening); click "-"to decrease the
LCD background voltage (LCD background is darkening). The adjustment range
is: 9.80V≤V≤10.10V;
6 Return to the main screen when adjustment is completed.
Figure 4-14 LCD background adjustment
4-10 4 Hardware