Micros Systems Workstation 4 LX Service Manual page 96

WS4 Troubleshooting
Testing the Power Supply and System Board Voltages
3. The ABRD36-B System Board adds Q20 and Q21 to control the +5V fed to the
Integrated and Pole customer display connectors. All other voltage test points and
component designations are the same as the AB28-F, G, and I.
Figure 3-3: Checking the ABRD36 System Board Working Voltages
The VCC5V_DISP circuit briefly removes power to the integrated and pole customer
displays ports when the LCD [Reset] button in the WS4 Diagnostics Utility is pressed.
This circuit requires UWS4.DLL Version 1.27 or later (part of GR 2.2) to be present.
3-10 Workstation 4 and 4 LX Field Service Guide