Medical workstations

Gyrus ACMI G400 Workstation: troubleshooting and error codes

The ServiceForge knowledge base holds 6 documented symptoms for the Gyrus ACMI G400 Workstation, with 8 ranked causes, 10 diagnostic checks with test points and expected values, and 102 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

System reset triggered (Fault 100-10)

Watchdog timeout or software execution failure causes system reset; display shows 'SYSTEM RESET'

Ranked causes

1. Unstable mains supply voltage (common)
2. Software watchdog timeout due to internal timing issue (rare)

First check

Measure mains supply voltage

Test point: Wall outlet and G400 power input
Expected: Within specification and stable

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

Video output not functioning

Generator video output to monitor does not display or shows incorrect OSD overlay

Ranked causes

1. Video OSD display disabled or misconfigured (common)
2. Video input/output BNC connectors disconnected or faulty (occasional)

First check

Navigate to Video OSD Select menu

Test point: G400 front panel Mode switch
Expected: 'Video OSD Select' displayed after pressing Mode multiple times

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

Mains electrical safety test failure high voltage

Electrical safety measurements do not comply with Class 1 type BF specifications per IEC60601-1-1

Ranked causes

1. Internal electrical insulation failure (unknown)

First check

Verify safety tester calibration

Test point: Safety tester documentation
Expected: Tester calibrated and approved for Class 1 type BF devices

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

Non-volatile memory corrupt (Fault 100-12)

Settings memory corrupted or not initialised; display shows 'SETTINGS CORRUPT' and 'SETTINGS FLT!'

Ranked causes

1. Settings memory corruption or initialisation failure (rare)

First check

Perform manual reset via Mode key

Test point: G400 front panel Mode key
Expected: Fault symbol flashes after first press; clears after second press

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

RF output not within specification high voltage

Generator RF power output does not meet expected values during testing with Biomed Test Cable

Ranked causes

1. Internal RF generation circuit fault (unknown)

First check

Verify Biomed Test Cable connection

Test point: G400 front panel
Expected: Display reads 'BioMed Non-Human-Use' PK3 200W, DES 120W

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

ROM checksum failure (Fault 100-11)

Internal firmware ROM corruption detected; display shows 'INTERNAL FAILURE' and '!!!!'

Ranked causes

1. ROM memory corruption or programming error (rare)

First check

Power cycle and observe self-test

Test point: G400 front panel display
Expected: 'ATTACH INSTRUMENT' symbol displays after self-test completes successfully

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

Error codes

Code	Meaning	Trigger	Severity
`100-10`	System reset triggered by watchdog timeout	Software execution failure or watchdog reset timeout	warning
`100-11`	ROM checksum failure detected	Firmware memory integrity check fails on startup	critical
`100-12`	Non-volatile settings memory corrupted	Settings memory not properly initialised or corrupted	error
`100-17`	System reset triggered by software execution failure	Background software execution error	warning
`100-18`	Continuous test timing failure	Background timing test exceeds time limit	critical
`100-19`	Background loop timing failure	Background task execution timing exceeds specification	critical
`100-20`	Status event queue overrun	Internal status event queue buffer overflow	critical
`100-21`	User event queue overrun	Internal user event queue buffer overflow	critical
`100-22`	VFD event queue overrun	Display interface event queue buffer overflow	critical
`100-23`	Waveform event queue overrun	RF waveform event queue buffer overflow	critical
`200-10`	PWM signal shorted high	PWM signal stuck at high logic level during self-test	critical
`200-11`	PWM signal shorted low	PWM signal stuck at low logic level during self-test	critical
`200-14`	Energy signal stuck high	Energy feedback signal remains high during self-test	critical
`200-18`	CUT/COAG signal stuck high	Mode selection signal remains high during self-test	critical
`200-19`	CUT/COAG signal stuck low	Mode selection signal remains low during self-test	critical
`200-20`	CLAMP signal error in DAC output	Digital-to-analog converter output for clamp control fails	critical
`200-21`	BOOST signal error in DAC output	Digital-to-analog converter output for boost control fails	critical
`200-22`	PEAKSET signal error in DAC output	Digital-to-analog converter output for peak setting fails	critical
`200-24`	RF_DET signal stuck low	RF detection feedback signal remains low during self-test	critical
`200-25`	OVERDOSE signal permanently ON	Overdose protection signal stuck high during self-test	critical
`200-26`	ENERGY signal stuck low	Energy feedback signal remains low during self-test	critical
`200-27`	PlasmaBlend Transformer feedback failure	Internal system fault detected during POST	critical
`200-28`	G400 Workstation too cold, dependent on temperature	Unit startup when ambient temperature is below operational threshold	warning
`200-31`	CURRLIM signal error (DAC output)	Internal POST check failure	critical
`200-32`	VOLTLIM signal error (comparator input)	Internal POST check failure	critical
`200-33`	BUSVOLT signal error (analogue input)	Internal POST check failure	critical
`200-34`	Incorrect PK RF board installed	System detects wrong RF board type during POST	critical
`200-35`	RF relay 1 (socket) not operating	Internal relay test failure during POST	critical
`200-36`	RF relay 2 (poles) not operating	Internal relay test failure during POST	critical
`200-42`	CPU POST Thermistor failure	Temperature sensor read error during POST	critical
`200-43`	CPU POST failure	Processor self-test fails at startup	critical
`200-44`	RAM test failure [POST check]	Memory read/write test fails during startup	critical
`200-45`	Crystal failure [POST check]	System clock oscillator malfunction detected	critical
`200-47`	Analogue reference failure [POST check]	Voltage reference circuit test fails	critical
`200-48`	CLAMP_SET failure [POST check]	Clamp voltage setting circuit fails test	critical
`200-49`	BOOST_SET failure [POST check]	Boost voltage setting circuit fails test	critical
`200-50`	CURRLIM_SET failure [POST check]	Current limit setting circuit fails test	critical
`200-51`	PEAK_SET failure [POST check]	Peak current setting circuit fails test	critical
`200-52`	COAG_CUT failure [POST check]	Coagulation/cutting mode detection fails	critical
`200-53`	PK_CUT_COAG failure [POST check]	Peak cut/coag detection fails	critical
`200-54`	PK_SKT_SET failure [POST check]	Peak socket setting circuit fails test	critical
`200-56`	NO_RF failure [POST check]	RF output detection fails during self-test	critical
`200-65`	RFBUS_VOLTS failure [POST check]	RF bus voltage measurement fails	critical
`200-67`	PSU_STATUS failure [POST check]	Power supply unit status detection fails	critical
`200-68`	Mains input failure [POST check]	Mains power detection fails during startup	critical
`200-69`	OVERDOSE failure [POST check]	Overdose protection circuit test fails	critical
`200-70`	PWM low failure [POST check]	Pulse width modulation circuit test fails	critical
`200-71`	ID CAL circuit failure [POST check]	Identification/calibration circuit test fails	critical
`200-72`	BUSLIM failure [POST check]	Bus current limit circuit test fails	critical
`200-73`	CURRLIM failure [POST check]	Current limit feedback circuit test fails	critical
`200-74`	VOLTLIM failure [POST check]	Voltage limit feedback circuit test fails	critical
`200-76`	VCC_ANA_DIV_2 failure [POST check]	Divided analogue supply voltage out of range	critical
`200-77`	12V failure [POST check]	12V supply voltage out of specification	critical
`200-78`	0V failure [POST check]	Ground reference measurement fails	critical
`200-79`	PK-RF Thermistor failure [POST check]	RF board temperature sensor fails	critical
`200-80`	RF_VOLTAGE [POST check]	RF output voltage measurement fails	critical
`200-81`	RF_CURRENT failure [POST check]	RF output current measurement fails	critical
`200-82`	ANALOGUE_REF failure	Analogue reference voltage out of specification	critical
`200-83`	VCC_ANA_DIV_2 failure	Divided analogue supply out of range	critical
`200-84`	12V failure	12V supply voltage out of specification	critical
`200-85`	0V failure	Ground reference voltage out of specification	critical
`200-86`	RF_DET stuck high failure	RF detection signal remains high continuously	critical
`200-87`	PSU_STATUS failure	Power supply status signal malfunction	critical
`200-88`	Mains input failure	Mains power detection circuit malfunction	critical
`200-89`	BUSLIM failure	Bus current limit circuit test fails	critical
`200-90`	CURRLIM_SET failure	Current limit setting circuit fails	critical
`200-92`	Over active ID count	Excessive ID (instrument identification) counts detected	critical
`200-93`	External Watchdog unable to reset CPU	External watchdog timer fails to reset processor	critical
`200-94`	Internal Watchdog unable to reset CPU	Internal watchdog timer fails to reset processor	critical
`300-10`	Internal overheating	Temperature exceeds thermal shutdown threshold	warning
`300-11`	Excess RF input voltage error (RFBUS > set)	RF bus voltage exceeds set limit	error
`300-12`	PK-RF board overheating	RF board temperature exceeds thermal threshold	warning
`300-14`	Accessory error: excessive RF output current	RF output current exceeds safe limit, output shorted	error
`300-19`	Two instruments of the same type attached	System detects duplicate instrument types connected	warning
`300-20`	Unsupported instrument type	System detects incompatible instrument	warning
`300-22`	Detected instrument with buildup of debris	Instrument electrode contamination detected	info
`400-10`	Footswitch BLUE pedal stuck	Blue footswitch button continuously depressed during startup	error
`400-11`	Footswitch YELLOW pedal stuck	Yellow footswitch button continuously depressed during startup	error
`400-12`	Footswitch MODE pedal stuck	Mode footswitch button continuously depressed during startup	error
`400-14`	Instrument identification circuit fault	Handpiece cable or instrument not detected correctly	error
`400-15`	Front panel Yellow UP button stuck	Yellow UP button continuously depressed during startup	error
`400-16`	Front panel Yellow DOWN button stuck	Yellow DOWN button continuously depressed during startup	error
`400-17`	Front panel Blue UP button stuck	Blue UP button continuously depressed during startup	error
`400-18`	Front panel Blue DOWN button stuck	Blue DOWN button continuously depressed during startup	error
`400-19`	Front panel MODE button stuck	MODE button continuously depressed during startup	error
`400-20`	Front panel STANDBY button stuck	STANDBY button continuously depressed during startup	error
`400-22`	Handswitch Yellow button stuck	Yellow handswitch button continuously depressed during startup	error
`400-23`	Handswitch Blue button stuck	Blue handswitch button continuously depressed during startup	error
`400-24`	Handswitch Mode button stuck	Mode handswitch button continuously depressed during startup	error
`600-01`	POST Aux board ADC check failure	Auxiliary board ADC does not respond in time	critical
`600-02`	Aux board relay checks failure	Auxiliary board relay malfunction detected	critical
`600-03`	Aux board relay 1 fail	Relay 1 on auxiliary board fails test	critical
`600-04`	Aux board relay 2 fail	Relay 2 on auxiliary board fails test	critical
`600-05`	Aux board relay 3 fail	Relay 3 on auxiliary board fails test	critical
`600-06`	Aux board relay 4 fail	Relay 4 on auxiliary board fails test	critical
`600-07`	Aux board relay 5 fail	Relay 5 on auxiliary board fails test	critical
`600-08`	Aux board relay 6 fail	Relay 6 on auxiliary board fails test	critical
`600-09`	Aux board relay 7 fail	Relay 7 on auxiliary board fails test	critical
`600-10`	Aux board relay 8 fail	Relay 8 on auxiliary board fails test	critical
`600-11`	Aux board +5vPC_A fail	Auxiliary board 5V supply voltage malfunction	critical
`600-12`	Aux board +V_OSET fail	Auxiliary board offset voltage supply malfunction	critical
`600-13`	Handswitching error	Handswitch control circuit malfunction	critical

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.