4-44 250cx Series Maternal/Fetal Monitor Revision C
2036947-001
Maintenance: External Display
9. Using an oscilloscope, verify the presence of the periodic waveform signal
HSYNC at J2 (pin 5).
10. Using an oscilloscope, verify the presence of the periodic waveform signal
VSYNC at J2 (pin 9).
11. If you suspect that the DSP Board is not supplying the correct voltage or one of
the video signals is missing and you have another properly functioning 250cx
Series Monitor, substitute the DSP Board and check for proper operation. Contact
your GE Service Representative for information about repair/exchange of the
DSP Board.
12. If you suspect that the interconnect cable is not working properly, refer to Chapter
6,
“Parts List, Drawings, and Replacement”
or contact your GE Service
Representative for part ordering information.
13. If you suspect that either the Display Driver Board or the Controller Power Unit
are not functioning correctly and you have another properly functioning 250cx
Series Monitor, substitute the entire display assembly and check for proper
operation. Refer to “Checkout” and “Checkout”. Contact your GE Service
Representative for ordering information.
External Display
Connect a known good display and check display. Display should match LCD
display for content and closely mimic colors.
Maternal SpO
2
Calibration
The 250cx Series Monitor automatically performs a self-test on the pulse oximetry
module upon power up and whenever the MSpO
2
module is reset. The self-test
verifies the integrity of the ROM, RAM, Back-End Processor, and System Voltage
levels. The module operation begins if no error was detected during the self-test.
Hardware Switches
The 250cx Series Monitor Main Motherboard contains one dip switch pack SW1,
which is used to:
enable/disable a factory test mode (for factory use only);
select between Hewlett-Packard or Corometrics–compatible outputs from the
rear panel J102 connector;
set the clock speed;
enable/disable the maternal NIBP option;
enable/disable/select the MSpO
2
option;
enable/disable the MECG option.
To configure these switches:
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