FRICK QUANTUM™ CONDENSER/VESSEL CONTROL PANEL S90-555 M
MAINTENANCE Page 7
TROUBLESHOOTING GCU BOARD ANALOG AND DIGITAL PROBLEMS
The information that follows in this section can help locate
problems that can occur with GCU Analog and Digital
input and output circuit boards.
“About” Screen
The “About” screen shows any Condenser and Vessel
GCU board(s) that have been detected. If a board has lost
communications, the affected boards will continue to run
their internal programs.
Diagnosing a GCU Board Problem
The GCU Board (both Condenser and Vessel) have built-
in features that help to troubleshoot faulty boards.
Following is a description of the built-in features:
1. The GCU Board has a “Status” LED indicator on
the board that blinks when the board’s software is
running.
If the “Status” LED is not blinking, check to
ensure that the EPROM is installed properly.
2. There are also 5 volt and 12 volt power LED's
that light when DC power is applied to the board.
If the either power LED is not lighted, check
the power harness for proper connectivity.
If the harness appears to be good, then
measure the voltages at the output of the DC
power supply.
3. The main indication of communications is the
RX/TX LED’s on the GCU board. These LED’s
should blink in response to the blinking of the
main processor board’s I/O communication
activity RX/TX LED’s. If the RX LED on the GCU
board is blinking but the board was not detected
on the “About” screen, or an I/O Comm failure
occurs, check the address of the board.
Reference the “JUMPER AND DIPSWITCH
SETTINGS” section later in this manual. This
section contains the dipswitch settings for
addressing all GCU Boards. When these
switches are properly set, the main
processor board is able to serially
communicate with each board and provide
data exchange.
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