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Revision C 250cx Series Maternal/Fetal Monitor 5-9

2036947-001

Troubleshooting: Diagnostic Control Screen

Replacing the Stepper Motor

1. Slide new stepper motor into place.

2. Replace the two screws which attach the motor to the frame.

3. Re-connect the stepper motor harness cable to the Recorder Board at J4.

Printhead Adjustments

Refer to “Recorder Top View” on page 5-12 and “Recorder Right Side View”

on page 5-12 for identification of the adjustment points outlined in this section, and

to assist in clarifying adjustment procedures. These figures show top and right side

views of the 250cx Series Monitor strip chart recorder assembly removed from the

unit’s chassis.

Table 14 gives a description of each recorder adjustment. Adjustments C through F

can be performed without removing recorder from unit’s chassis; however, they

require removing the monitor’s top cover.

The printhead may require performing one or both of the following offset

adjustment procedures.

Vertical Offset Adjustment

To check vertical offset alignment, run at least two monitor self-tests by depressing

the front panel Test button. The first horizontal trace should be printed 0.490 ± 0.002

inch from the right hand paper guide. (Refer to figure “Vertical Offset

Adjustment Self-Test Trace” on page 5-13.) Perform the following steps if the

trace does not fall within the specified offset range.

1. Loosen the two set screws labeled A in Figure on page 5-12.

2. Adjust hex-head screw labeled C in Figure on page 5-12, until test trace falls

within specified tolerance.

3. Tighten the two set screws labeled A.

Horizontal Offset Adjustment

Adjust the horizontal offset if any of the following symptoms are detected. If

skewing occurs, check for other malfunctions. Noticeable skewing of a vertical line

printed on the strip chart paper is usually accompanied by one of the following

symptoms:

 Paper consistently curls to one side.

 Printing of unequal weight occurs along the vertical trace line, from one end to

the other.

 Dots are missing along the vertical trace.

 Printing is too light following printhead replacement.

If the Horizontal Offset Adjustment is required, perform the following steps:

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