GE Healthcare MAC 5500 HD

Preventive Maintenance Procedure

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Asset Type

Electrocardiograph (EKG) Machine

Manufacturer

GE Healthcare

Model

MAC 5500 HD

Manual Reference

MAC 5500/MAC 5500 HD Resting ECG Analysis System Service Manual, Software Version 10, document 2046275-017G, Revision G, 31 January 2019.

Manufacturer Recommendation / AEM Status

The service manual does not establish one single interval for every maintenance activity. It lists maintenance activities at several different frequencies.

Manufacturer-Listed Frequencies

The manual states that failure to implement a satisfactory maintenance schedule may cause equipment failure and possible safety hazards. Regular maintenance is required regardless of equipment usage.

Battery Criteria

Post-Repair Inspection

The service manual provides a component-specific checkout matrix. Depending on the component replaced or the work performed, required post-repair checks may include:

Power-supply, motherboard, enclosure, hardware-upgrade, and other listed repairs require electrical safety testing or other applicable checkout procedures before return to service.

AEM Status

If the facility performs this PM at a different interval or changes the manufacturer-listed activities, the change should be managed through the facility’s approved AEM program, documented risk assessment, maintenance history, and applicable regulatory requirements.

What This PM Procedure Covers

Required Tools and Equipment

A facility electrical-safety analyzer may be used in place of the specifically listed tester when it can perform the manufacturer-listed test conditions and the substitution is permitted by facility policy.

Step-by-Step PM Procedure

1. Identify the Device and Configuration

Record the model, serial number, software version, installed acquisition module, communication options, trolley, barcode reader, card reader, and other configured accessories.

Expected outcome: Device identity and installed configuration match the equipment record.

2. Review Service History

Review the equipment record for unresolved repairs, intermittent failures, battery complaints, print-quality problems, liquid intrusion, or accessory issues.

Confirm whether the three-month battery-conditioning and printhead-cleaning activities are due.

Expected outcome: No unresolved condition prevents completion of the PM or safe testing.

3. Inspect the Housing and Exterior

Inspect the following:

Equipment requiring repair must not be used until repairs are completed.

Expected outcome: Housing, display, mounting, labels, and mechanical components are intact and secure.

4. Inspect the Power Cord

Inspect the complete power cord for:

Remove a damaged cord from service and replace it. Do not repair or modify the power cord.

Expected outcome: Power cord is intact, properly grounded, and free from damage.

5. Inspect the Patient Cable and Leadwires

Inspect the acquisition cable, patient cable, leadwires, adapters, connector pins, strain reliefs, and labels.

Check for:

Expected outcome: Patient cable and leadwires are clean, secure, correctly identified, and free from damage.

6. Clean the Exterior

Turn the system off and disconnect accessories as appropriate.

Clean exterior surfaces using a cloth lightly moistened with mild soap and water. Disinfect using a manual-approved sodium-hypochlorite solution or wipe:

Dry the device completely before operation.

Do not immerse the device or cables. Do not allow fluid to pool around connector pins. Do not use ammonium-chloride products, abrasive cleaners, acetone, ketones, Betadine, alcohol-based exterior cleaning products, sodium salts, wax-containing products, autoclaving, or steam cleaning.

Expected outcome: Surfaces are clean, dry, and free from cleaning-related damage.

7. Clean and Inspect the Thermal Printhead

When the three-month activity is due, open the writer compartment and inspect the printhead and roller area.

Clean the thermal printhead with an alcohol-containing solution applied to a nonwoven, nonabrasive cloth such as Techni-Cloth. Do not use paper towels.

Inspect for paper residue, contamination, scratches, or damage.

Expected outcome: Printhead is clean and undamaged.

8. Verify Paper Loading and Writer Operation

Confirm:

Perform a diagnostic writer test when print quality or paper transport is questionable.

Expected outcome: Paper feeds correctly and printed traces are legible, uniform, and complete.

9. Perform Startup Check

Connect the device to AC power and verify:

Normal opening of the startup screen indicates that the power-up self-test passed.

Expected outcome: Device completes startup without errors and reaches the normal operating screen.

10. Check the Display, Keyboard, and Speaker

Operate the display and all commonly used controls.

When indicated by equipment condition, repair history, or facility procedure, run the following manufacturer diagnostic tests:

Verify:

Expected outcome: Display, controls, and audible output function normally.

11. Verify ECG Acquisition and Recording

Connect an ECG simulator through the acquisition module and patient cable.

Perform:

Verify:

For a MAC 5500 HD configuration, confirm that HD is displayed when a CAM HD is connected, Version 10 software is installed, and the HDMD option is activated.

Expected outcome: Device acquires, displays, analyzes, and prints a simulated ECG without errors.

12. Check Storage and Transmission Options

When configured and included by facility policy, verify:

Do not fail an unconfigured option merely because it is unavailable.

Expected outcome: Installed and supported options function as configured.

13. Check Battery Condition

Inspect the battery for swelling, leakage, heat damage, damaged contacts, or deformation.

Verify the system operates from battery power and transfers between AC and battery operation without an unexpected shutdown.

Review the following Battery Status information in system diagnostics:

At an indicated charge of 80% or greater, expected battery voltage is 15–24 V.

Battery temperature greater than 45°C / 113°F indicates failure. Consider replacement when battery temperature exceeds ambient temperature by more than 10°C / 50°F.

Expected outcome: Battery is physically intact, recognized, charges normally, and supports battery operation.

14. Condition or Capacity-Test the Battery When Due

The manufacturer recommends one deep-discharge conditioning cycle every three months.

When conditioning is due:

  1. Fully charge the battery.
  2. Disconnect AC power.
  3. Operate the device or run the Battery Discharge Test until the device shuts down.
  4. Reconnect AC power.
  5. Recharge the battery completely.

Do not perform repeated unnecessary deep-discharge cycles.

When a formal Battery Discharge Test is performed, the manufacturer-listed minimum discharge capacity is 2,000 mAh.

Battery discharge capacity:
Result = ______ mAh
Pass / Fail = ______

A result below 2,000 mAh is a manufacturer-listed reason to consider battery replacement.

Electrical Safety Testing

The service manual lists annual current-leakage and ground-continuity testing. Perform the applicable manufacturer-listed tests with the unit powered on and record every measured value and pass/fail result.

Ground Continuity

Test from the AC mains ground prong to the exposed metal ground lug or other applicable exposed grounded metal.

Ground resistance measured in ohms, manufacturer limit <0.2 Ω:
Result = ______ Ω
Pass / Fail = ______

Earth Leakage Current

Earth leakage measured in microamps:
Facility limit used = ______ µA
Maximum result = ______ µA
Pass / Fail = ______

Enclosure Leakage Current

Touch/chassis leakage measured in microamps:
Facility limit used = ______ µA
Result = ______ µA
Pass / Fail = ______

Patient Leakage Current to Ground

Patient leakage measured in microamps:
Facility limit used = ______ µA
Result = ______ µA
Pass / Fail = ______

Patient Leakage Current — Mains on Applied Part

Mains-on-applied-part leakage measured in microamps:
Facility limit used = 5,000 µA
Result = ______ µA
Pass / Fail = ______

Record all electrical-safety values, not only the final pass/fail result.

15. Final Inspection and Return to Service

Confirm:

Expected outcome: Device is complete, functional, electrically safe, and ready for clinical use.

Pass / Fail Criteria

Pass

The device passes when:

Remove From Service

Remove the device from service when any of the following is present:

Copy/Paste CMMS Work Order Procedure

Post-Repair Safety Inspection

Use the manufacturer service manual, facility policy, and approved AEM program to determine the final PM interval and return-to-service requirements.

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