Revision C 250cx Series Maternal/Fetal Monitor 4-43
2036947-001
Maintenance: Display Check
Display Check
There is no calibration or replacement procedure for either the Display Driver Board
or the Power Controller Unit. Contact your GE Service Representative for
information about repair/exchange of the entire display assembly.
WARNING
HIGH VOLTAGE—The 250cx Series Monitor display backlight
generates potentially dangerous voltages capable of causing
personal injury (~700 VAC). Do not touch the display electronics
during operation!
CAUTION
ELECTROSTATIC DISCHARGE—The 250cx Series Monitor
display uses CMOS and MOS-FET components. These
components are electrostatic sensitive. Unpack, assemble, and
examine this assembly in a static-controlled area only. When
shipping, use packing materials designed for protection of
electrostatic-sensitive components.
Checking a Display
In troubleshooting, the following methods can be employed to determine whether a
problem exists with the display assembly, the 250cx Series Monitor DSP Board or
the interconnect cable.
Verifying the DSP Board Operation
1. Turn off the monitor.
2. Remove the nine screws which secure the monitor top cover. Four screws are
located on the bottom of the monitor and five screws are located in the back.
3. Remove the cover by sliding it toward the rear of the monitor.
4. Unplug the display interconnect cable from J2 on the DSP Board.
5. Turn on the 250cx Series Monitor.
6. For making the following measurements on the DSP Board, use J2 (pin 3) on
the for the ground (or negative) connection.
7. Using a digital voltmeter, measure the LCD voltage at J2 (pin 12). Verify that
the LCD voltage is +3.3 Vdc +
0.3 Vdc.
8. Using an oscilloscope, verify the presence of the periodic waveform signal
PCLK at J2 (pin 1).
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