GE Healthcare MAC 5

LAN/WLAN or network communication failure

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Asset Type

Electrocardiograph (EKG) Machine

Manufacturer

GE Healthcare

Model

MAC 5

What This Guide Helps With

Troubleshooting MAC 5 LAN, WLAN, network, order download, ECG transmission, or connectivity failures before repair escalation.

Step-by-Step Troubleshooting

Ensure Patient Safety First

Confirm the MAC 5 is not actively being used to acquire a patient ECG.

If the communication issue occurs after acquisition, make sure the ECG is saved locally or printed if clinically needed before restarting or changing network settings.

Expected outcome: Patient ECG data is protected before troubleshooting begins.

Confirm the Exact Network Complaint

Ask the user what failed and when it occurred.

Determine whether the issue involves:

Expected outcome: The issue is separated into local device, wired network, wireless network, destination, or configuration problem.

Check Whether the Device Has Power and Is Fully Booted

Confirm the MAC 5 powers on normally and reaches the main operating screen without boot errors.

If the device is frozen, slow, or showing system errors, restart only after confirming no unsaved ECG is at risk.

Expected outcome: Network troubleshooting starts from a stable operating state.

Check LAN Cable Connection if Using Wired Network

Inspect the Ethernet cable at the MAC 5 and the wall jack.

Reseat both ends of the cable and check for broken clips, damaged insulation, bent connectors, or loose wall plate ports.

Expected outcome: The cable is firmly connected and physically intact.

If reseating the cable restores communication, document the cable connection issue and stop.

Swap the Ethernet Cable

Replace the Ethernet cable with a known-good cable.

This helps rule out a damaged or intermittent patch cable before assuming a device or network failure.

Expected outcome: The MAC 5 communicates normally with the known-good cable.

If the replacement cable resolves the issue, remove the bad cable from use and stop.

Test the Network Wall Jack

Move the MAC 5 to a known-working network jack, or ask IT to verify the original jack.

If another device works on the same jack, the jack is less likely to be the cause.

Expected outcome: The problem follows either the MAC 5 or the network location.

If the MAC 5 works on another jack, escalate the wall jack or network drop issue to IT.

Confirm WLAN Is Enabled if Using Wireless Network

Verify the MAC 5 is configured for wireless operation and is not accidentally set to wired-only communication.

Confirm the device is in range of the expected wireless network.

Expected outcome: Wireless communication is enabled and the device is within usable signal range.

Check Wireless Signal and Location

Move the MAC 5 closer to a known-good access point or to an area where other MAC 5 units communicate successfully.

Avoid testing in shielded rooms, basements, elevators, storage rooms, or areas with known poor wireless coverage.

Expected outcome: Wireless signal improves and communication succeeds.

If communication works in another area, document a probable wireless coverage or access point issue and involve IT.

Confirm the Correct Network Is Selected

Check that the MAC 5 is attempting to connect to the correct hospital SSID or approved network profile.

Incorrect SSID selection, expired credentials, or guest-network connection can prevent worklist and ECG transmission even if Wi-Fi appears connected.

Expected outcome: The device is connected to the correct clinical network.

Check IP Address and Network Status

Review the device network status screen, if accessible.

Look for whether the MAC 5 has a valid IP address, subnet, gateway, and DNS information.

Expected outcome: The MAC 5 has a valid network address appropriate for the site.

If the IP address is missing, invalid, duplicated, or outside the expected range, involve IT before changing network configuration.

Compare Against a Known-Good MAC 5

Compare the failing MAC 5 with another working MAC 5 in the same department.

Check only externally verifiable items such as:

Expected outcome: The failure is isolated to one device, one location, or a broader network/destination issue.

Check Date and Time

Verify the MAC 5 date and time are reasonably correct.

Incorrect date, time, or timezone can interfere with authentication, worklist queries, ECG record matching, and downstream system acceptance.

Expected outcome: Device time matches site expectations.

Confirm the Destination System Is Available

Ask whether other ECG carts are successfully sending to the same destination.

If multiple carts cannot send, the issue may be with MUSE, the EMR interface, DICOM destination, server, VPN, firewall, or network routing.

Expected outcome: The issue is not incorrectly blamed on one MAC 5 when the destination system is unavailable.

Check Worklist Versus ECG Send Separately

Test whether the MAC 5 can retrieve orders or worklist.

Then test whether a completed ECG can transmit.

Worklist failure with successful send may indicate one destination or interface issue. Send failure with successful worklist may indicate a different server, port, route, or receiving-system issue.

Expected outcome: The failed network function is narrowed to order retrieval, transmission, or both.

Review Error Messages

Record the exact error message displayed by the MAC 5.

Note whether the error refers to network unavailable, server unavailable, authentication, timeout, failed transmission, host unreachable, or invalid destination.

Expected outcome: The error message supports accurate escalation to IT, Clinical Engineering, or the vendor.

Restart the MAC 5 Safely

After confirming patient data is saved or no active patient exam is in progress, restart the MAC 5.

Do not repeatedly power-cycle the device if the same failure returns.

Expected outcome: Temporary communication or software session issues clear after one safe restart.

If restart resolves the issue, perform a test transmission if site workflow allows, document the result, and stop.

Check for Physical Damage

Inspect the LAN port, wireless antenna area if externally visible, cart housing, power connector area, and accessory connections.

Look for impact damage, liquid intrusion, loose connectors, cracked plastics, unusual heat, or odor.

Expected outcome: No visible damage suggests continued external troubleshooting is reasonable.

If damage, heat, liquid exposure, or burning odor is found, remove the device from service.

Coordinate With IT Before Changing Network Settings

Do not guess at IP addresses, wireless credentials, certificates, ports, or destination settings.

Network changes should match site-approved configuration and be coordinated with IT or the ECG system administrator.

Expected outcome: The device is not misconfigured during troubleshooting.

Perform a Controlled Test Transmission

If allowed by site policy, send a test ECG or known test record to the approved destination.

Confirm with the receiving system or clinical staff whether the record arrived.

Expected outcome: Communication is verified end-to-end, not just from the device screen.

If the test transmission succeeds, return the device to service.

If the Problem Persists

If LAN cable, wall jack, wireless signal, network selection, IP status, destination availability, restart, and basic configuration checks do not resolve the issue, common external causes have been ruled out.

The MAC 5 should be:

Knowing when to stop is proper troubleshooting. Do not perform internal disassembly or board-level repair during routine clinical area troubleshooting.

Clinical Use Tip

Do not troubleshoot network communication during active ECG acquisition. If ECG transmission is unavailable, confirm whether the ECG can be printed, saved locally, or transferred by an approved downtime workflow before returning the device to clinical use.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Clinical staff reported the GE MAC 5 would not send completed ECGs over WLAN to the ECG management system."

Cause

What was observed during troubleshooting.

Example:
"Verified the MAC 5 had poor wireless signal in the treatment area but transmitted successfully when moved near a known-good access point."

Resolution

What action was taken.

Example:
"Documented probable wireless coverage issue, notified IT, confirmed successful test transmission from a known-good location, and returned the MAC 5 to service with location limitation noted."

Helpful Details to Include (If Known)

Final Thought

MAC 5 network troubleshooting should move from simple external checks to workflow and destination verification before repair escalation. Protect patient ECG data first, avoid unnecessary configuration changes, and document the complaint, cause, and resolution clearly so Clinical Engineering, IT, and ECG system administrators can act on accurate information.

That is successful troubleshooting.

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