Patient monitors · BeneVision family

Mindray BeneVision N22: troubleshooting and error codes

The ServiceForge knowledge base holds 28 documented symptoms for the Mindray BeneVision N22, with 78 ranked causes, 63 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Blank screen upon startup

Monitor powers on (AC or battery) but display shows nothing; no image or backlight.

Ranked causes

1. Front housing display interface board defective (occasional)
2. AC-DC power module damaged (occasional)
3. Main control board defective (occasional)
4. Screen line, screen and backlight line defective (occasional)
5. Coaxial cable of display interface damaged (occasional)
6. DCDC board failure (occasional)

First check

Verify AC indicator status

Test point: AC LED on monitor
Expected: AC LED is ON

3 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

SMR cannot identify parameter modules

Smart Module Rack does not recognize installed parameter modules; module status shows unknown or offline.

Ranked causes

1. External cable defective or poorly connected (common)
2. Defective parameter module (occasional)
3. Wrong communication board software version (occasional)
4. SMR power supply abnormal (occasional)
5. 8-slot Module rack communication board defective (rare)
6. DCDC board failure (rare)

First check

Verify SMR to main unit cable connection

Test point: SMR cable connectors at both ends
Expected: Cable fully inserted and seated

2 more checks with pass and fail actions, 8 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit does not power on high voltage

Monitor fails to power on when AC mains connected or battery available; no LED indicators light up.

Ranked causes

1. AC mains not connected or insufficient battery power or battery damaged (common)
2. Cable defective or improperly connected (common)
3. Power switch & LED board defective (occasional)
4. Power module defective (occasional)
5. Motherboard failure (occasional)

First check

Verify AC mains connection to socket

Test point: AC power inlet
Expected: AC mains properly connected to socket

3 more checks with pass and fail actions, 8 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Alarm LED off or cannot be turned off patient safety

LED indicator does not light during alarm condition; or LED remains lit when alarm should be off while audible alarm sounds.

Ranked causes

1. Cable defective or improperly connected (common)
2. Alarm LED board failure (occasional)
3. Front housing interface board failure (occasional)
4. Main board failure (occasional)

First check

Verify alarm LED board cable connection

Test point: Alarm LED board to front housing interface board connector
Expected: Cable fully inserted and seated

1 more check with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Failure to connect to wireless network

Monitor cannot establish wireless connection; wireless network not detected or authentication fails.

Ranked causes

1. Incorrect network settings (common)
2. Antenna not installed properly (common)
3. Wireless module damaged (occasional)
4. Main control board failure (rare)

First check

Verify wireless network settings in System menu

Test point: Network settings > Wireless menu
Expected: Network SSID correct; authentication method matches router; password correct

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

MPAN module failure

MPAN (Patient Area Network) module does not function; no communication on MPAN interface.

Ranked causes

1. Antenna not installed properly (common)
2. MPAN module damaged (occasional)
3. SMR COM board defective (occasional)
4. Wrong software version for MPAN module (occasional)

First check

Verify MPAN antenna installation

Test point: MPAN antenna on module
Expected: Antenna fully connected and oriented properly

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

No audible alarm sounds patient safety

Alarm LED indicates alarm condition but no sound is emitted; audible alarm silent while LED is normal.

Ranked causes

1. Audible alarm disabled (common)
2. Cable defective or improperly connected (common)
3. Speaker failure (occasional)
4. Main board failure (occasional)

First check

Check minimum alarm volume setting

Test point: System > Maintenance > Alarm menu
Expected: Minimum Alarm Volume set to proper value (not minimum)

2 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Touchscreen does not respond

Touch input not recognized; screen responds to AC power but does not register finger taps or stylus input.

Ranked causes

1. Touchscreen disabled (common)
2. Cable defective or improperly connected (common)
3. Touchscreen control board defective (occasional)
4. Front housing interface board failure (occasional)

First check

Check touchscreen enable status

Test point: Main Menu QuickKey area on screen
Expected: No disable symbol visible above Main Menu QuickKey; or symbol present

2 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

USB device unusable

USB connected device not recognized or does not function; enumeration fails after connection.

Ranked causes

1. USB enumeration failure (common)
2. Cable defective or improperly connected (common)
3. USB Hub board failure (occasional)
4. Main board failure (occasional)

First check

Restart the system

Test point: Monitor power cycle
Expected: System restarts and USB device re-enumerates

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

Battery cannot be recharged

Battery pack does not charge when AC mains connected; charging indicator does not light.

Ranked causes

1. Battery damaged (common)
2. Cable defective or improperly connected (common)
3. DCDC interface board damaged (occasional)

First check

Verify battery interface board cable to DCDC board

Test point: Battery interface board to DCDC interface board connector
Expected: Cable fully connected and seated

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

Battery cannot supply power

Battery pack installed but does not power monitor when AC is disconnected; monitor shuts down immediately.

Ranked causes

1. Battery damaged (common)
2. Cable defective or improperly connected (common)
3. DCDC interface board damaged (occasional)

First check

Verify battery cable connection

Test point: Battery interface board to power module connector
Expected: Cable fully connected and seated

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

Cannot view other patients in View Others mode

Monitor connected to network but cannot see other patient monitors or view remote patient data.

Ranked causes

1. Improper network cable connection (common)
2. Too many simultaneous requests (occasional)
3. Incorrect IP configuration (common)

First check

Verify network cable connection and length

Test point: Network cable from monitor to network infrastructure
Expected: Cable length <= 50 m; connector fully seated

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

Devices Integrated window shows nothing after connection

External device connected to monitor but Device Integration interface shows no device information.

Ranked causes

1. ID adapter not compatible with external device (common)
2. Serial port adapter cable not compatible (common)
3. Wrong software or protocol version of external device (occasional)

First check

Verify ID adapter compatibility

Test point: Device Information menu in Devices Integrated window
Expected: Device information displayed; ID adapter recognizes external device

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

No output for nurse call

Nurse call output interface does not function; external nurse call system does not receive signal from monitor.

Ranked causes

1. DCDC interface board cable loose (common)
2. DCDC interface board damaged (occasional)
3. Main board failure (occasional)

First check

Verify DCDC interface board cable connection

Test point: DCDC interface board to main board connector
Expected: Cable fully inserted and seated

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

Secondary screen does not function

External secondary monitor connected via DP port does not display; no image on external display.

Ranked causes

1. Cable defective or improperly connected (common)
2. DP cable not inserted when system powered on (occasional)
3. Secondary screen power off (occasional)

First check

Verify secondary screen power button

Test point: Secondary display power switch
Expected: Secondary screen power on after pressing button for 5s

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

Blank screen but monitor operates normally

Display shows no image but monitor functions; patients are being monitored; alarms sound and LEDs work.

Ranked causes

1. Cable defective or improperly connected (common)
2. LCD defective (occasional)

First check

Verify display cable connections

Test point: Front housing interface board and main control connectors
Expected: Cables connected properly with no signs of looseness

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

Frequent network dropouts or disconnects

Network connectivity intermittent; monitor frequently disconnects from hospital network or loses signal.

Ranked causes

1. Improper network cable connection (common)
2. Incorrect IP configuration (common)

First check

Verify network cable length

Test point: Network cable from monitor to switch or wall outlet
Expected: Cable length does not exceed 50 m

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

Monitor has no response when loading ID adapter

Monitor hangs or freezes when ID adapter is loaded; no response to user input during ID adapter loading.

Ranked causes

1. BeneLink module application software corrupted (common)
2. BeneLink module damaged (occasional)

First check

Verify BeneLink module software version

Test point: System > Maintenance > Version menu before adapter load
Expected: BeneLink module software version listed and current

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

No +12 V output high voltage

Power supply does not provide +12 V to components; voltage measurement at test points reads zero.

Ranked causes

1. Power supply protected (common)
2. DCDC interface board damaged (occasional)

First check

Power off and restart monitor

Test point: Power button
Expected: +12 V output restored after restart

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

No +3.3 V output high voltage

Power supply does not provide +3.3 V to components; voltage measurement at test points reads zero.

Ranked causes

1. Power supply protected (common)
2. DCDC interface board damaged (occasional)

First check

Power off and restart monitor

Test point: Power button
Expected: +3.3 V output restored after restart

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

No +5.0 V output high voltage

Power supply does not provide +5.0 V to components; voltage measurement at test points reads zero.

Ranked causes

1. Power supply protected (common)
2. DCDC interface board damaged (occasional)

First check

Power off and restart monitor

Test point: Power button
Expected: +5.0 V output restored after restart

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

Calibration: BIS (Bispectral Index) measurement patient safety

Verify BIS module and sensor function using healthy subject or simulator

Ranked causes

1. BIS sensor or module not functioning or not calibrated (unknown)

First check

Connect BIS sensor (live subject method)

Test point: BIS sensor electrodes
Expected: Sensor properly applied per manual
Tools: None

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

Calibration: Cardiac Output (C.O.) measurement

Verify cardiac output module measures correctly at 5 L/min using patient simulator with thermodilution injection

Ranked causes

1. C.O. module not calibrated or configured (unknown)

First check

Verify blood temperature setting

Test point: Patient simulator BT display
Expected: 37±0.1ºC
Tools: Medsim300B or equivalent simulator

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

Calibration: CCO/SvO2 interconnection

Verify cardiac output and oxygen saturation data consistency between patient monitor and Vigilance monitor in demo mode

Ranked causes

1. CCO/SvO2 interconnection not configured or malfunctioning (unknown)

First check

Configure interconnection between monitors

Test point: Patient monitor and Vigilance monitor network connection
Expected: Both monitors connected and Demo mode enabled
Tools: None

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

Calibration: EEG electrode impedance

Verify EEG channel impedance and signal quality using test method selected

Ranked causes

1. EEG module or leads not properly connected or tested (unknown)

First check

Connect EEG test equipment

Test point: EEG lead connectors
Expected: Proper connection to simulator or test device
Tools: ECG simulator or resistance box per method

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

Calibration: IBP pressure measurement

Verify invasive blood pressure channels measure correctly at zero and 200 mmHg using patient simulator

Ranked causes

1. IBP module not zeroed or calibrated (common)

First check

Connect patient simulator to IBP connector

Test point: IBP connector
Expected: Simulator connected via dedicated adapter cable
Tools: Patient simulator (Medsim300B or MPS450)

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

Calibration: Temperature measurement

Verify temperature channels display correct values when resistance box simulates body temperature

Ranked causes

1. Temperature sensor or channel not calibrated (unknown)

First check

Connect resistance box to temperature connector

Test point: Temp connector pins
Expected: 1354.9 Ω applied
Tools: Resistance box (accuracy >0.1 Ω)

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

Generate alarm: BeneLink Comm Stop

Monitor generates 'BeneLink Comm Stop' alarm; BeneLink module communication failure or module error.

Ranked causes

1. BeneLink module application software corrupted (common)

First check

Verify BeneLink module software version

Test point: System > Maintenance > Version menu
Expected: BeneLink module software version listed; current or compatible version

1 corrective action and part numbers 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.