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Revision C 250cx Series Maternal/Fetal Monitor 5-11

2036947-001

Troubleshooting: Diagnostic Control Screen

5. Open the recorder door.

6. Support the printhead by reaching in through the recorder door, then remove the

two screws on top of the printhead.

7. Pull the printhead down and out through the recorder door with the harness still

attached.

NOTEIf you are familiar with other Corometrics monitors, be

assured that the four pressure springs are held captive and

will not fall out.

8. Remove the harness cable from the printhead and retain for use with

replacement printhead.

Replacing the Printhead

Use the following procedure for installing a 250cx Series Monitor printhead:

1. Turn off the 250cx Series Monitor and disconnect the power cord from the

monitor.

2. Carefully remove the new printhead from the packaging; do not touch any of

the contact pins. Record the voltage rating marked on the decal affixed to the

bottom of the printhead. This value is the VHEAD voltage. The voltage rating

should be marked over the old voltage rating on the printhead bracket.

3. Re-connect the harness cable to the printhead.

4. Slide the new printhead into position through the recorder door and under its

bracket. Push on the center of the printhead to ensure it is pushed all the way

back.

5. Align the printhead with the front holes in the bracket and replace the two

screws.

6. Re-connect the harness cable to the Recorder Board at J3.

7. Connect the positive lead of a voltmeter to TP1 on the Recorder Board; connect

the negative lead to TP2.

8. Re-connect the monitor power cord and then turn on the monitor.

9. Press the Record button to turn on the recorder.

10. Adjust R2 on the Recorder Board until the reading on the digital voltmeter is

within ±100 mV of the VHEAD voltage stamped on the printhead.

11. Access the Diagnostic Control service mode screen and run the recorder test to

check the printing of vertical lines. (Refer to “Diagnostic Tests” on page 5-3.)

If light printing occurs, refer to the instructions under “Horizontal Offset

Adjustment” on page 5-9.

12. Replace the top cover and secure all nine screws.

Other manuals for GE Corometrics 250cx Series

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