GE Corometrics 250cx Series, Service Manual, Page: 143 / 252

Revision C 250cx Series Maternal/Fetal Monitor 5-3
2036947-001
Troubleshooting: Diagnostic Tests
Diagnostic Tests
Main Motherboard and DSP Board Self-Test
Upon power-up, the 250cx Series Monitor’s Main Motherboard and DSP Board
perform a number of tests before allowing the monitor to enter the normal
operational mode. After setting the
Power
switch to the on (
I
) position, the tests run
for approximately 2 seconds. If all tests pass, the monitor enters the normal
operational mode. During normal operational mode, the monitor continues to
perform a series of self-tests. If a test fails, you will see one of the following error
messages centered in the display:
SYSTEM FAULT: ROM
SYSTEM FAULT: RAM
SYSTEM FAULT: Alert
SYSTEM FAULT: UI KEYPAD
SYSTEM FAULT: SOFTWARE
SYSTEM FAULT: DEFAULTS
SYSTEM FAULT: DSP
The first errors indicate problems on the Main Motherboard. The last error indicates
a problem on the DSP Board. If the monitor displays any of these messages, turn off
the monitor and contact your GE Service Representative.
Monitor Self-Test
The 250cx Series Monitor contains self-test routines which verify the unit’s
calibration and internal circuitry. These routines are initiated by depressing the front
panel
Test
button. The test results are printed on the strip chart recorder paper,
verifying the integrity of the unit.
It is recommended practice to initiate the self-test feature at the beginning of each
monitoring session. Refer to Self-Test Routine in the “Maintenance Section.”
Error Log Screen
The
Error Log
screen, as shown below, displays a service log of the 250cx Series
Monitor. The service log is useful only to GE engineering and may be requested by
your service representative. There are 255 error codes that can be detected by the
monitor. The
Error Log
is comprised of multiple pages with up to 20 error codes per
screen. Each screen displays three columns:
„ The
Error ID
column lists the error code. The
Count
column lists the number
times the error code has occurred.