GE Healthcare MAC VU360

Asset Type

Electrocardiograph (EKG) Machine

Manufacturer

GE Healthcare

Model

MAC VU360

Manual Reference

MAC VU360 Resting ECG Analysis System Service Manual, Version 3.00, 5956455-8EN Revision 1.

Manufacturer Recommendation / AEM Status

Manufacturer-listed PM Frequency

Regular yearly maintenance, regardless of usage. The manual states that yearly maintenance is essential to ensure the equipment is functional when required.

Manufacturer-listed PM Items

The service manual points yearly maintenance toward functional checkout, visual inspection, electrical safety checks, and diagnostic checks. For the annual electrical safety checkout, the manual lists visual inspections 1–7, operational checks 1–6, diagnostic checks 1–17, and electrical safety checks.

Calibration

The system does not require calibration procedures.

Cleaning

The service manual refers cleaning procedures to the MAC VU360 Operator’s Manual. Do not create cleaning chemicals or cleaning intervals from this service manual alone.

Battery Replacement Interval

No fixed battery replacement interval is specified in the provided service manual. Battery condition is evaluated by inspection, battery metrics, and quick battery charge/discharge testing. The manual lists battery replacement need when battery conditioning is required or battery pack condition is unacceptable.

Filter Replacement Interval

Not applicable / not specified in the provided manual.

Post-repair Safety Inspection Requirements

The manual provides FRU and non-FRU checkout tables. Several FRU repairs require electrical safety checks, including keyboard assembly, printer PWA, power supply, power inlet module, printer module, touchscreen, display assembly, expansion board, CPU board, FIPS wireless module, hardware kit, and harness/cables. Non-FRU “no parts replaced” and hardware upgrade repairs require electrical safety checks if the device is opened.

AEM Note

If a facility performs this PM at a different interval or changes the listed activities, that should be handled under the facility’s approved AEM program, risk assessment, maintenance history, and applicable regulatory requirements.

What This PM Procedure Covers

This procedure covers visual inspection of the ECG device, patient cables, leadwires, battery, power cord, connectors, trolley, and labels; functional checkout using simulated ECG data; device diagnostics; battery quick charge/discharge check; electrical safety testing; and CMMS documentation for audit support.

Required Tools and Equipment

Electrical safety analyzer capable of ground continuity and leakage testing.

ECG simulator capable of NSR, known heart rate, and known gain.

Barcode test setup if barcode reader is installed.

AC power source.

Thermal ECG paper.

Facility-approved cleaning supplies, if cleaning is performed per operator manual.

USB drive only if exporting diagnostic results or service documentation is required by facility policy.

Step-by-Step PM Procedure

1. Confirm Device Identity

Action: Verify manufacturer, model, serial number, asset tag, location, and software version if required by facility policy.

Expected outcome: Device identity matches the CMMS record.

2. Remove Device From Clinical Use for PM

Action: Confirm the device is not connected to a patient. Power down and disconnect from AC power before visual inspection or cleaning.

Expected outcome: PM is performed without patient connection or clinical interruption.

3. Perform Exterior Visual Inspection

Action: Inspect the device surface for cracks, dust collection, or other damage. Inspect safety markings, labels, and labeling for legibility and completeness. Inspect plastic parts for proper fit, finish, and deformation.

Expected outcome: No physical damage, missing labeling, or enclosure defects are present.

4. Inspect Patient Cable, Leadwires, and Electrodes

Action: Inspect patient cable, leadwires, and electrodes for defects, damage, corrosion, discoloration, brittle wires/connectors, and expiration.

Expected outcome: Patient connection accessories are intact, not expired, and suitable for clinical use.

5. Inspect Keyboard and Touchscreen

Action: Inspect the keyboard membrane for cuts, cracks, and illegible key labels. Inspect the touchscreen for scratches, cracks, or viewing impairment.

Expected outcome: User controls and display are readable and usable.

6. Inspect Power Cord, Connectors, and Power Source

Action: Inspect the AC power cord, I/O connectors, cables, and plug hardware for fraying, bent prongs/pins, cracked housings, and loose screws. Verify the power source does not show obvious issues such as faulty wiring.

Expected outcome: Power and connection points are safe and mechanically intact.

7. Inspect Battery Pack

Action: Inspect the battery pack for cracked, swollen, or leaking enclosure and debris on electrical contacts.

Expected outcome: Battery pack has no visible damage or contact contamination.

8. Inspect Trolley and Casters

Action: Inspect trolley structure and casters. Lock the trolley casters and verify the wheels do not move.

Expected outcome: Trolley is stable, casters lock properly, and the device can be safely positioned.

9. Power On and Verify Basic Operation

Action: Reconnect AC power. Power on the device. Confirm normal startup, screen operation, and no unresolved service condition.

Expected outcome: Device powers on normally and is ready for functional testing.

10. Perform ECG Functional Checkout

Action: Using an ECG simulator, record a rhythm strip of simulated ECG data and verify it records successfully. Record a 12-lead ECG using simulated NSR with known heart rate and gain, such as NSR at 80 bpm with 1 mV R-wave.

Expected outcome: Rhythm strip records successfully. 12-lead ECG is analyzed and recorded successfully.

11. Verify Storage and Transmission

Action: Store a simulated ECG and verify it stores successfully. Transmit a simulated ECG and verify it is successfully received, if network transmission is used at the facility.

Expected outcome: ECG storage and transmission pass.

12. Verify Barcode Reader, If Installed

Action: Scan a barcode using the connected barcode reader. Confirm the barcode reader communicates successfully with the device.

Expected outcome: Barcode scan is accepted and communication is successful.

13. Run Device Diagnostics

Action: Perform applicable diagnostics from the service screen. For annual electrical safety checkout, the manual lists diagnostic checks 1–17: keyboard, touchscreen, quick battery charge/discharge, barcode reader, display, audio, writer, LAN, WLAN, brightness, Acquisition LED, Acquisition pushbutton, Acquisition barcode, USB port, KISS pump, keyboard LED, and accelerometer diagnostics.

Expected outcome: Applicable diagnostic checks pass.

14. Perform Quick Battery Charge / Discharge Check

Action: Use the quick battery charge/discharge procedure from the service diagnostics.

For quick charge, verify battery charge is between 5% and 80%, connect AC power, record initial percentage and current, and observe for 5 minutes.

For quick discharge, verify battery charge is above 20%, disconnect AC power, record initial battery current, and observe for 5 minutes.

Expected outcome: Charge check: percentage increases more than 2% from initial value and battery current is between 100 mA and 2200 mA. Discharge check: battery current reads negative and does not vary more than ±10% from the initial recorded value within 5 minutes.

Electrical Safety Testing

The manual lists electrical safety checks using IEC 62353:2014 references and includes protective earth resistance, equipment leakage current, touch current, patient leakage current, and applied part leakage current.

Protective Earth Resistance

Manual-listed test point: AC mains power cord ground prong to exposed metal surface / ground lug.

Manual-listed limit: < 200 mΩ.

Ground resistance measured in ohms, expected ≤ 0.5 Ω or facility/NFPA 99 criteria if different.

Result =

Pass / Fail =

Equipment Leakage Current

Forward polarity, NC: limit ≤ 500 µA.

Neutral open, forward polarity, SFC: limit ≤ 1000 µA.

Neutral open, reverse polarity, SFC: limit ≤ 1000 µA.

Reverse polarity, NC: limit ≤ 500 µA.

Result =

Pass / Fail =

Touch / Chassis Leakage Current

The manual notes touch current is not mandatory for IEC 62353. If performed, use the manual-listed limits.

Forward polarity, NC: limit ≤ 100 µA.

Neutral open, forward polarity, SFC: limit ≤ 500 µA.

Ground open, forward polarity, SFC: limit ≤ 500 µA.

Ground open, reverse polarity, SFC: limit ≤ 500 µA.

Neutral open, reverse polarity, SFC: limit ≤ 500 µA.

Reverse polarity, NC: limit ≤ 100 µA.

Touch/chassis leakage measured in microamps:

Facility limit used =

Result =

Pass / Fail =

Patient Leakage Current

The manual notes patient leakage current is not mandatory for IEC 62353. If performed, use the manual-listed limits.

Forward polarity, NC: limit ≤ 10 µA.

Neutral open, forward polarity, SFC: limit ≤ 50 µA.

Ground open, forward polarity, SFC: limit ≤ 50 µA.

Ground open, reverse polarity, SFC: limit ≤ 50 µA.

Neutral open, reverse polarity, SFC: limit ≤ 50 µA.

Reverse polarity, NC: limit ≤ 10 µA.

Result =

Pass / Fail =

Applied Part Leakage Current

Forward polarity, neutral / ground closed, SFC: limit ≤ 50 µA.

Reverse polarity, neutral / ground closed, SFC: limit ≤ 50 µA.

Result =

Pass / Fail =

Pass / Fail Criteria

PM Passes When

Visual inspection finds no unsafe damage or unacceptable wear.

Patient cable, leadwires, electrodes, power cord, connectors, battery, trolley, labels, and enclosure pass inspection.

Simulated rhythm strip records successfully.

Simulated 12-lead ECG records and analyzes successfully.

Storage and transmission checks pass where used.

Barcode reader check passes where installed.

Applicable diagnostics pass.

Battery quick charge/discharge check passes.

Electrical safety testing passes manual-listed or facility-approved limits.

Remove From Service If

Device fails electrical safety testing.

Power cord, ground connection, enclosure, or battery condition is unsafe.

Patient cable or leadwires are damaged, brittle, corroded, discolored, defective, or expired.

ECG acquisition, analysis, printing, storage, or transmission fails.

Required diagnostics fail.

Trolley/caster issue creates a safety risk.

Any condition could affect patient safety, ECG accuracy, or reliable clinical use.

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