Electrocardiographs · MAC family

GE Healthcare MAC 5000: troubleshooting and error codes

The ServiceForge knowledge base holds 28 documented symptoms for the GE Healthcare MAC 5000, with 55 ranked causes, 46 diagnostic checks with test points and expected values, and 1 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

ECG data displays unacceptable noise levels

Acquired ECG data shows excessive noise that is unacceptable for analysis

Ranked causes

1. Improper electrode placement (common)
2. Improper electrode application or contamination (common)
3. Defective or out of date electrodes (occasional)
4. Defective, broken, or disconnected leadwires (occasional)
5. Patient movement during acquisition (common)

First check

Verify electrode placement

Test point: Electrode sites
Expected: Electrodes properly positioned per protocol

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Missing ACI-TIPI Report

ACI-TIPI interpretation report is not generated or displayed

Ranked causes

1. ACI-TIPI is disabled (common)
2. Selected report is without interpretation (common)
3. ACI-TIPI required information not entered (common)
4. Patient entered as pediatric with invalid age (occasional)
5. Original ECG acquired without ACI-TIPI option (rare)

First check

Verify ACI-TIPI is enabled

Test point: System settings or configuration
Expected: ACI-TIPI feature enabled

3 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No BP from External Device

External blood pressure measurement device is not communicating or providing BP data

Ranked causes

1. Setup not configured correctly (common)
2. Suntech protocol not configured on Tango device (occasional)
3. Defective or disconnected cables (common)
4. TTL trigger not functioning (occasional)

First check

Verify setup configuration

Test point: System setup menu
Expected: External BP device properly configured

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Treadmill/Ergometer does not move patient safety

Exercise equipment (treadmill or ergometer) is not functioning or responding to commands

Ranked causes

1. Protocol not configured correctly (common)
2. Defective or disconnected cables (common)
3. Input/output settings incorrect (common)
4. Emergency Stop switch activated (occasional)

First check

Verify protocol configuration

Test point: Protocol settings menu
Expected: Equipment protocol correctly configured

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Visual inspection defects identified caution

Physical inspection reveals damaged connectors, loose components, debris, moisture on boards, or faulty wiring

Ranked causes

1. I/O connectors and cables damaged or loose (common)
2. Circuit board contamination or component issues (common)
3. Loose or faulty ground connections and wiring (occasional)
4. Fuses of wrong type or rating, or open fuses (occasional)

First check

Inspect I/O connectors and cables

Test point: All I/O connector plugs
Expected: No fraying, bent pins, cracked housing, or loose screws

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Thermal writer output distorted or misaligned caution

First character distorted, paper skew or crush at edges, diagonal lines curved or wavering, perforations misaligned with tear bar, or paper travel not smooth.

Ranked causes

1. Motor speed control or paper speed incorrect (common)
2. Worn or damaged print roller (occasional)
3. Broken or missing print head dot (occasional)

First check

Run 50 mm/s Test Pattern I

Test point: Printed page
Expected: Length 250 mm ± 5 mm, straight uniform diagonal lines, smooth paper travel, ±5 mm

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not power on

Equipment fails to start or display is not visible on startup; green AC power light does not glow when connected

Ranked causes

1. Unit not turned on or AC not connected (common)
2. Battery not installed (occasional)
3. AC outlet not powered or faulty wiring (occasional)

First check

Verify green AC power indicator glows

Test point: AC power LED on unit
Expected: Green light visible

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Acquisition module not powered or not communicating

Acquisition module test shows module is not powered or not responding to communication commands.

Ranked causes

1. Acquisition module power supply disconnected or defective (common)
2. Acquisition module cable disconnected or defective (common)

First check

Run Acquisition Module Test

Test point: Acquisition module status
Expected: Module shows powered and communicating

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

COM port communication failure

COM port loopback test fails to echo transmitted ASCII characters back to receive lines, or modem test unable to establish communication with external modem.

Ranked causes

1. COM port hardware defective or cable disconnected (common)
2. External modem not properly connected or defective (common)

First check

Run COM Port Loopback Test for each port (COM1, COM2, COM3, COM4)

Test point: Serial port with loopback jumper installed
Expected: Test result displays Passed

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Floppy disk read/write or format failure

Floppy disk test fails to read and write on formatted disk, or diskette format fails with message 'Please insert a data diskette'.

Ranked causes

1. Floppy disk drive defective or unable to format (occasional)
2. Unformatted or incompatible diskette (common)

First check

Format unformatted diskette on external PC

Test point: Diskette file system
Expected: Diskette successfully formats on PC

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Modem error remote device not responding

Message 'MODEM ERROR. The remote device is not responding. Would you like to retry?' displayed

Ranked causes

1. Modem not connected or wireless client bridge not connected (common)
2. MAC 5000 out of range of access point (wireless option) (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Poor quality ECGs

ECG waveforms are degraded, noisy, or incomplete; may appear on display or printout with noise artifacts

Ranked causes

1. Environmental factors or patient preparation issues (common)
2. Hardware failure in acquisition module, leadwires, or cables (occasional)

First check

Use simulator to obtain ECG report

Test point: Simulator input connector
Expected: Good quality ECG report from simulator

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

SD card read/write or memory failure

SD card test fails to read, write, or perform memory check on inserted SD card.

Ranked causes

1. SD card defective or corrupted (common)
2. CPU board defective (occasional)

First check

Insert SD card that is not write-protected

Test point: SD card slot
Expected: SD card fully inserted and recognized

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Analog input voltage not reading correctly high voltage

Analog input test shows incorrect voltage reading when DC power supply is connected to DC input pins of ANA/TTL connector.

Ranked causes

1. Main CPU board defective or analog input circuit failure (occasional)

First check

Run Analog Input Test with DC power supply connected to DC input pins

Test point: ANA/TTL connector DC input pins
Expected: Voltage reading displayed matches input voltage applied

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Analog output voltage incorrect or missing high voltage

Analog output test shows +12V, DC Output 1, DC Output 2, ECG Output, or TTL Trigger Output voltage reading does not match expected value on oscilloscope.

Ranked causes

1. Main CPU board defective or analog output circuit failure (occasional)

First check

Connect oscilloscope to DC Output 1 test point (pin 2) with ground on pin 4 or 5

Test point: DCOut1 pin 2 vs ground
Expected: Voltage reading matches selected test output value

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery charge low indicator flashing

Battery icon flashes intermittently on screen

Ranked causes

1. Battery charge is low (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery current excessive with AC power off patient safety

Battery current reading less than -0.7 amps (e.g., -0.8 amps) when AC power is not applied and system is idle.

Ranked causes

1. Main CPU board defective or drawing excessive current (occasional)

First check

Check Battery Status with AC power not applied

Test point: Battery current display
Expected: Greater than or equal to -0.7 amps (less negative) A

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery voltage abnormal or capacity insufficient patient safety

Battery voltage below 15 volts with 80% or more charge remaining, or minimum discharge capacity less than 2000 mAH.

Ranked causes

1. Battery aged or defective (common)

First check

Check Battery Status with AC power applied and 80% or more charge remaining

Test point: Battery voltage display
Expected: Between 15 and 24 volts V, 15 to 24 V

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Device password does not work

Cannot use the system because Device Password does not work

Ranked causes

1. Device Password changed or not communicated (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Display pixels missing or not illuminating

Screen Display Tests reveal missing or non-functional pixels during pixel verification or grey scale pattern tests.

Ranked causes

1. Display screen defective (common)

First check

Run Pixel Verification Test

Test point: Display screen
Expected: All pixels illuminated uniformly across screen

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Internal ambient temperature excessive caution

Ambient temperature inside unit more than 10 degrees greater than current room temperature during normal operation.

Ranked causes

1. Poor internal ventilation or blocked cooling air path (occasional)

First check

Check Battery Status for ambient temperature

Test point: Ambient temperature display
Expected: Within 10 degrees of current room temperature

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Keyboard key does not register or highlight

Pressed key does not highlight on screen or display at the top of screen during keyboard test.

Ranked causes

1. Keyboard defective or key contact failure (common)

First check

Run Keyboard Test

Test point: All keyboard keys
Expected: Each key highlighted on screen with scan code displayed at top

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Lead disconnected message appears

'X' Lead disconnected message shown on screen

Ranked causes

1. Electrode(s) disconnected (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

No battery installed indicator displayed

Battery icon appears on screen

Ranked causes

1. No battery installed (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Speaker produces no audible tone

Speaker test produces no sound output when Loud or Soft is selected and Enter key is pressed.

Ranked causes

1. Main CPU board defective (speaker is part of CPU board) (common)

First check

Run Speaker Test from System Diagnostics menu

Test point: Speaker output
Expected: Audible loud or soft tone

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

System does not power up on battery

Unit will not turn on when operating from battery power

Ranked causes

1. Battery is empty (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

System shuts down during battery operation

Unit powers off while operating from battery

Ranked causes

1. Battery is empty or Automatic Shutdown enabled (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Writer door open indicator displayed

Writer door open icon appears on screen

Ranked causes

1. Writer door is open (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`E-14`	Example error code format used in manual	Not specified in text	unknown

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.