ECG systems

GE Healthcare MAC 1600: troubleshooting and error codes

The ServiceForge knowledge base holds 22 documented symptoms for the GE Healthcare MAC 1600, with 43 ranked causes, 56 diagnostic checks with test points and expected values, and 19 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Unit not functioning properly after power-up

System does not display proper startup screen or complete self-test after power-up

Ranked causes

1. Unit is not turned on (common)
2. Battery not installed or discharged (common)
3. AC power not connected or outlet faulty (common)
4. Changes in use, location, or environment (occasional)
5. Hardware or software modification since last use (occasional)
6. Operator error (occasional)

First check

Verify unit is powered on

Test point: Power switch and indicators
Expected: Unit powered on, startup screen displays

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

ECGs will not save to SD card

User performs ECG but data does not save to SD card storage

Ranked causes

1. SD card not fully inserted (common)
2. Incompatible SD card capacity (common)
3. SD card is write-protected (occasional)
4. Defective SD card (occasional)
5. Automatic save not configured (common)

First check

Verify SD card is fully inserted

Test point: SD card slot on back panel
Expected: SD card flush with slot, not protruding

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

ECG data displays unacceptable noise levels

Acquired ECG signal contains excessive noise. Check with Hookup Advisor indicator in ECG menu under System Setup > ECG > ECG Acquisition.

Ranked causes

1. Poor skin preparation or electrode placement (common)
2. Defective or date-expired electrodes (common)
3. Defective, broken, or disconnected leadwires (common)
4. Acquisition module noise test failure (occasional)

First check

Verify skin preparation and electrode placement

Test point: Patient skin and electrode contact points
Expected: Clean skin with proper electrode contact

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

Acquisition module test failure

Acquisition board fails diagnostic test indicating board malfunction

Ranked causes

1. Loose or disconnected acquisition board harnesses (common)
2. Defective acquisition board (occasional)
3. Defective mainboard/ETE module (occasional)

First check

Select Acquisition Module Test button from DIAGNOSTIC TESTS window

Test point: Acquisition board
Expected: Test result displayed (Passed or Failed)

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

Battery capacity insufficient

Device unable to complete multiple ECGs or extended operation on battery power

Ranked causes

1. Battery not fully charged (common)
2. Battery degradation or failure (occasional)

First check

Verify battery charge level

Test point: Battery indicator on display
Expected: Fully charged (100%)

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

Modem test failure (internal or external)

Internal or external modem test returns Failed message, indicating modem hardware failure or defective connection

Ranked causes

1. Internal modem hardware failure (common)
2. External modem hardware failure (common)

First check

Connect MAC 1600 device to an active analog phone line

Test point: Phone line connection
Expected: Device connected to active phone line (not inactive)

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

Patient lead wire disconnected or open circuit patient safety

Patient lead wires fail connectivity test; shows Disconnected status during diagnostic test

Ranked causes

1. Lead wire damaged, loose, or not properly connected to cable (common)
2. Patient cable acquisition board defective (occasional)

First check

Patient lead wire connectivity test

Test point: Each patient lead wire connected to patient simulator or shorting bar
Expected: Connected message displayed for each lead wire
Tools: Patient cable with lead wires, patient simulator or shorting bar

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

Poor quality ECGs

ECG waveforms are degraded, noisy, or do not meet expected quality standards

Ranked causes

1. Environmental factors or inadequate patient preparation (common)
2. Hardware failures in acquisition module, lead wires, or cables (occasional)

First check

Visually inspect I/O connectors, cables, and AC power cord

Test point: Connectors and cords
Expected: No fraying, damage, bent prongs, cracked housing, or loose screws

9 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Thermal writer paper does not move

Paper remains stationary during print operations; stepper motor not advancing paper

Ranked causes

1. Faulty stepper motor (common)
2. Printer assembly failure or faulty cables (occasional)

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

Thermal writer paper moves but lines do not print

Paper advances correctly but no output appears on paper, indicating printhead electrical disconnection or failure

Ranked causes

1. Faulty cables in printer assembly (common)
2. Printhead failure (occasional)

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

Thermal writer produces incorrect output speed

Printed output spans incorrect distance per mm/s test (50mm/s, 25mm/s, 12.5mm/s, or 5mm/s), indicating stepper motor or speed control failure

Ranked causes

1. Faulty stepper motor (common)
2. Printer board failure (occasional)

First check

Ensure thermal paper properly loaded in writer tray

Test point: Paper tray
Expected: Thermal paper loaded and ready

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

Battery life indicator below specification

Battery Life Remaining shows less than 3:00 hours with 100% charge remaining, or Battery Charge Remaining is below expected levels during battery test

Ranked causes

1. Battery aging or degradation (common)

First check

Verify AC power disconnected and wait one minute

Test point: Device power state
Expected: Device running on battery power only

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

COM port communications test failure

RS232 loop-back test on COM 1 or COM 2 fails, indicating mainboard serial port failure

Ranked causes

1. Mainboard/ETE module failure (common)

First check

Short pins 2 & 3 on COM A connector with paper clip

Test point: COM A pins 2 & 3
Expected: Pins shorted for loop-back test

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

Display test failure

Color bar pattern discolored or black pixels exceed 4 per pane during display self-test

Ranked causes

1. Defective display assembly (common)

First check

Press right arrow key on Trimpad to move color bars horizontally

Test point: Display screen
Expected: Red, green, blue, white color band pattern scrolls horizontally without discoloration

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

Enable Hookup Advisor to monitor signal quality

Hookup Advisor provides real-time signal quality indication during ECG acquisition.

Ranked causes

1. Hookup Advisor disabled (occasional)

First check

Verify Hookup Advisor is enabled

Test point: ECG menu System Setup > ECG > ECG Acquisition
Expected: Hookup Advisor enabled

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

Keyboard test failure

Keys do not produce asterisk on screen or sticky keys not highlighting properly during diagnostic test

Ranked causes

1. Defective keyboard assembly (common)

First check

Press each key on keyboard and verify asterisk appears on screen representation

Test point: Keyboard and display screen
Expected: Asterisk appears on screen for each key pressed

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

LAN connectivity test failure

LAN Test indicates Network Unavailable when device is connected to an active network, indicating network adapter or mainboard failure

Ranked causes

1. Mainboard/ETE module network adapter failure (common)

First check

Connect MAC 1600 device to an active LAN

Test point: Network connection
Expected: Device connected to active network (not inactive tap)

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

Speaker test failure

No audible tone heard from speaker during diagnostic test

Ranked causes

1. Defective mainboard/ETE module assembly (common)

First check

Select Speaker Test button from DIAGNOSTIC TESTS window and listen for audible tone

Test point: Speaker output
Expected: Brief audible tone present

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

Startup screen shows but system not in expected mode

Startup screen displays but next screen is not the expected Resting ECG mode or selected Power up mode

Ranked causes

1. Power up mode configured differently than expected (occasional)

First check

Verify System Configuration Power up mode setting

Test point: System Configuration menu
Expected: Resting ECG mode selected (default)

Thermal writer produces faded prints

Printed output appears faded or has insufficient darkness, indicating roller contamination or wear

Ranked causes

1. Faulty or worn roller (common)

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

Thermal writer produces gaps or missing dots in output

Printed output shows gaps or missing dots in lines, indicating printhead wear or contamination

Ranked causes

1. Printhead failure or wear (common)

First check

Select Print Head Test button and print 1-page report

Test point: Printed output
Expected: No gaps in any printed lines; up to 5 mm blank paper allowed at top and bottom

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

USB port malfunction

USB keyboard input does not register or character input field remains empty during diagnostic test

Ranked causes

1. Mainboard or ETE module defective (unknown)

First check

USB keyboard character input test

Test point: MAC 1600 USB port back panel
Expected: Character in Character Input field matches key pressed
Tools: USB keyboard matching system language selection

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

Error codes

Code	Meaning	Trigger	Severity
`Acquisition Error -1`	General acquisition error	Generic error condition in acquisition system	error
`Acquisition Error 10`	Acquisition driver communication error	Communication between driver and acquisition board fails	error
`Acquisition Error 11`	Acquisition firmware file not found	Firmware file missing or not accessible	error
`Acquisition Error 2`	Synchronization error in 100ms ECG packet	100ms data packet does not arrive on schedule	error
`Acquisition Error -2`	Acquisition module not connected or detected	Acquisition board not connected or communication lost	error
`Acquisition Error -3`	Acquisition buffer overflow	Acquisition buffer memory exceeds capacity	error
`Acquisition Error 3`	Sequence number error in 100ms ECG packet	Packet sequence number out of order or duplicated	error
`Acquisition Error -4`	Invalid command sent to acquisition driver	Invalid command received by acquisition driver	error
`Acquisition Error 4`	Checksum error in 100ms ECG packet	Packet data integrity check fails	error
`Acquisition Error 7`	Acquisition self test error	Built-in self test failed during startup or self test mode	error
`Acquisition Error 8`	Error loading acquisition firmware	Firmware file cannot be loaded or loaded incorrectly	error
`Acquisition Error 9`	Acquisition driver failed to open	Driver cannot initialize communication with acquisition board	error
`Printer Internal Error 1`	Printer firmware detected an error	Printer internal firmware self-test or operation failed	error
`Printer Internal Error 2`	Printhead temperature is too hot or too cold to print	Printhead thermal sensor out of range during operation	error
`Printer Internal Error 3`	Printer driver could not be opened	Software driver fails to initialize	error
`Printer Internal Error 4`	Printer driver communication error	Communication lost between software and printer during operation	error
`Printer Internal Error 5`	Printer driver timeout error	Printer does not respond within expected time	error
`Printer Internal Error 6`	Printer driver miscellaneous error	Generic error condition in printer subsystem	error
`Printer Internal Error 7`	Undefined printer status was received	Printer reports unrecognized status code	error

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.