Micros Systems Workstation 4 LX Service Manual page 31

Introduction to the WS4/WS4 LX FRUs
Workstation 4 and 4 LX - LCD/Touchscreen/Mag Stripe Reader
• Backlight Inverter Board - P/N 700633-005.
This board attaches to the LCD bracket and powers the Samsung or Sharp LCD
backlight tubes. Two versions of the backlight inverter board now exist. The
original board can be identified by the number 'XB33' located near the input
connector J1.
The ROHS compliant version of the backlight inverter is the same MICROS P/N
as the previous board, but includes a new transformer that operates at a higher
frequency. This board can be identified by the model number 'XBRB33'
silk-screened near the input connector J1.
The increased operating frequency of the inverter circuit is optimized for the
Sharp LG41 and later the LG61 LCD, and results in diminished backlight
brightness if used with the EOL Samsung LCD and GR 2.0 platform software.
The low brightness levels affect the DIM and NORMAL brightness settings and
are inherent to the new transformer's operating characteristics. See the 'Other
Platform Files and Folders' section of Chapter 3 for more information.
Workstation 4 and 4 LX Field Service Guide 1-19