Pulse oximeters · Rad family

Masimo Rad-97: troubleshooting and error codes

The ServiceForge knowledge base holds 37 documented symptoms for the Masimo Rad-97, with 52 ranked causes, 53 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

Gas readings are questionable patient safety

Capnography gas measurement values appear unreliable or inaccurate

Ranked causes

1. Incorrect sampling line used (common)
2. Sampling line attached incorrectly (common)
3. Sampling line leaking (occasional)
4. Internal error (rare)

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

LEGI indicator dark (off)

LEGI indicator light is not illuminated

Ranked causes

1. Rad-97 with Capnography requires a power cycle (common)
2. Sampling line not fully plugged in (common)
3. Internal error (rare)

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

Pre-repair general procedures caution

General preparation steps for Rad-97 pulse oximeter disassembly and repair including damage inspection, marking documentation, and software version recording.

Ranked causes

1. Need to prevent equipment damage and ensure proper repair documentation (common)
2. Ensure software compatibility after board replacement (common)
3. Verify warranty coverage (occasional)

First check

Verify precautions before disassembly

Test point: AC power cord and unit condition
Expected: AC power cord removed; unit cleaned per procedures; ESD precautions in place

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

Battery does not charge

Rad-97 connected to AC power but battery does not accept or maintain charge

Ranked causes

1. AC power cable disconnected (common)
2. Internal charging circuit failure (rare)

First check

Verify AC power cable is fully inserted in AC outlet and Rad-97

Test point: AC power cable connectors at wall outlet and Rad-97 AC inlet
Expected: Cable inserted firmly with no play

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

Calibration: NIBP Module Pressure Accuracy

NIBP module pressure readings compared to calibrated manometer standard across 0-280 mmHg range; must be within ±3 mmHg tolerance per international standards.

Ranked causes

1. NIBP module requires zero point calibration (occasional)
2. NIBP module requires span point calibration (occasional)

First check

Connect calibration apparatus and set up manometer

Test point: Manometer, 500 mL bottle or cuff, hand bulb connected to NIBP module
Expected: All connections secure via T adapters and tubing

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

Capnography values not displayed on host monitor

Capnography measurements do not appear on connected host device display

Ranked causes

1. Rad-97 with Capnography requires a power cycle (common)
2. Host device incorrectly configured or incompatible (occasional)

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

LEGI indicator steady red caution

LEGI indicator is illuminated with steady red color

Ranked causes

1. Rad-97 with Capnography requires a power cycle (common)
2. Internal error (occasional)

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

Main screen is dim or blank

Rad-97 powers on but display is not visible; screen shows minimal or no content

Ranked causes

1. Brightness setting too low (common)
2. Internal display failure (rare)

First check

Locate brightness setting in menu and increase value

Test point: Brightness control in system settings menu
Expected: Display becomes brighter and readable

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

Nurse Call connection not triggering or showing incorrect resistance patient safety

Nurse Call interconnection cable shows open circuit or incorrect resistance values when alarm triggered or device in idle state

Ranked causes

1. Nurse Call cable misconfiguration or connection fault (occasional)
2. Defective Nurse Call port or internal signal routing failure (rare)

First check

Set Nurse Call polarity to Normal

Test point: Device Output settings Nurse Call Polarity
Expected: Polarity set to Normal

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

Software and battery fuel gauge mismatch after battery replacement

Battery replacement requires coordinated software and fuel gauge firmware updates; incorrect sequencing may cause improper battery performance.

Ranked causes

1. Device software update performed after battery replacement instead of before (occasional)
2. Battery fuel gauge firmware below minimum version V1.0.0.0 (occasional)

First check

Perform device software upgrade

Test point: Software version in Main Menu > About screen
Expected: Version matches yellow 4600 mAh battery kit version (minimum recommended)

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

Unit does not power on

Rad-97 does not respond to power button press; no display, no LED indicators

Ranked causes

1. Power button not pressed long enough (common)
2. Battery depleted (common)

First check

Press and hold Power Button

Test point: Power Button on unit
Expected: System powers on after 2 seconds

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

Alarm limit parameter not updating on display patient safety

Changed High SpO2 Alarm parameter does not appear on display screen or shows incorrect value

Ranked causes

1. Display software or parameter memory issue (rare)

First check

Connect sensor and obtain SpO2 reading

Test point: Sensor on finger; Display SpO2 value
Expected: Valid SpO2 value displayed on screen

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

Battery charge indicator does not illuminate

Battery charge indicator on home button of Rad-97 front panel does not light up after connecting power cord to power entry module on rear of device.

Ranked causes

1. Battery not properly connected (common)

First check

Verify battery charge indicator illuminates on home button

Test point: Home button on front panel
Expected: Battery charge indicator illuminates

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

Battery icon shows red X on Main Screen

Battery icon displayed on Main Screen shows a red X through it, indicating battery connection issue.

Ranked causes

1. Battery not properly connected (common)

First check

Verify battery icon on Main Screen does not show red X

Test point: Main Screen battery icon
Expected: Battery icon displays without red X, indicates charging

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

Battery not holding sufficient charge

Run time is below specification

Ranked causes

1. Battery aged or degraded below Full Charge Capacity (used) limit (common)

First check

Read Full Charge Capacity from Battery Diagnostics screen

Test point: Battery Diagnostics menu
Expected: At or above Full Charge Capacity (used) limit

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

Battery not identified after replacement

Battery charge indicator on home button does not illuminate, or battery icon shows red X on main screen

Ranked causes

1. Battery cable not properly connected (common)

First check

Verify battery charge indicator on home button illuminates

Test point: Home button on front panel
Expected: Battery charge indicator illuminates

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

Battery replacement requires software and firmware updates

Device software and battery fuel gauge firmware must be updated when battery is replaced to ensure proper operation

Ranked causes

1. Battery replacement with yellow 4600 mAh battery (occasional)

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

Battery replacement requires specific firmware versions for 5400 mAh battery

Device software and battery fuel gauge firmware minimum versions must be met when replacing with blue 5400 mAh battery

Ranked causes

1. Blue 5400 mAh battery replacement (occasional)

First check

Verify device software version meets minimum V1.6.4.0 for 5400 mAh battery

Test point: Main Screen > Main Menu > About screen > Processor field
Expected: V1.6.4.0 or higher

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

Battery replacement software requirements unknown

Uncertainty about which software and firmware versions are required when replacing Rad-97 battery

Ranked causes

1. Unclear minimum firmware versions for battery replacement (unknown)

First check

Confirm battery replacement kit contents

Test point: Battery replacement kit
Expected: Both device software upgrade USB drive and battery fuel gauge firmware USB drive included

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

Battery replacement software update needed

After battery replacement, device software and battery fuel gauge firmware must be updated in correct sequence

Ranked causes

1. Battery replaced requiring firmware synchronization (unknown)

First check

Verify minimum software version for yellow 4600 mAh battery

Test point: Main Menu, About screen, Processor field
Expected: Device software and battery fuel gauge firmware V1.0.0.0 or higher

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

Calibration: NIBP Air Leak Test

Pneumatic system air leakage measured over test period; must not exceed 6 mmHg/minute per international standards.

Ranked causes

1. Pneumatic system leakage exceeds tolerance (rare)

First check

Connect calibration apparatus and power on manometer

Test point: Manometer, 500 mL bottle, hand bulb connected to NIBP module
Expected: Manometer powered on, set to mmHg, calibrated within 12 months

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

Calibration: NIBP Overpressure Safety Test (Adults/Pediatrics) patient safety

Overpressure relief valve function verified; pressure relief valves must open within specified pressure ranges (300±10 mmHg for adults/pediatrics, 150±5 mmHg for neonates).

Ranked causes

1. Overpressure relief valves open beyond tolerance (rare)

First check

Connect apparatus; verify appropriate cuff size for patient population

Test point: Manometer, 500 mL bottle or cuff, hand bulb; cuff type
Expected: Adult or Pediatric cuff confirmed; do not use Neonate cuff for adults/pediatrics

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

Charging indicator shows red

Rad-97 charging indicator LED illuminates red instead of expected green/amber; indicates charge fault condition

Ranked causes

1. Internal charging circuit fault (rare)

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

Continuous speaker tone sounds caution

Continuous audible alarm tone emits from unit; cannot silence by normal alarm dismiss

Ranked causes

1. Internal audio controller malfunction (rare)

First check

Press and hold Power Button for 8 seconds to force shutdown

Test point: Power Button on unit
Expected: Alarm silences and unit powers off

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

Electrical safety test required after disassembly high voltage

Mandatory electrical safety testing required following any disassembly of Rad-97 unit.

Ranked causes

1. Verify electrical safety after service (common)

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

ESD protection procedures caution

Precautions required to minimize electrostatic discharge damage during service including grounding and anti-static equipment.

Ranked causes

1. Prevent ESD damage to sensitive electronic components (common)

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

Home button does not work

Home button on control panel does not respond when pressed; no navigation occurs

Ranked causes

1. Home button switch failure (rare)

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

LEGI indicator blinking red caution

LEGI indicator is blinking with red color

Ranked causes

1. Sampling line obstructed (occlusion) (common)

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

Low or degraded battery run time

Battery runtime significantly reduced from normal operation

Ranked causes

1. Battery memory effect from incomplete charge/discharge cycles (occasional)

First check

Perform complete discharge and full recharge cycle

Test point: Battery charging system
Expected: Battery runtime restored to normal levels after full cycle

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

Nurse Call does not communicate patient safety

Nurse Call feature does not establish connection to hospital communication system; no signal transmitted

Ranked causes

1. Nurse Call connector loose or disconnected (common)

First check

Visually inspect Nurse Call connector at Rad-97 and wall outlet

Test point: Nurse Call connector at both ends
Expected: Connector fully seated and locked

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

Software upgrade fails or device corrupted

Device power is interrupted during software upgrade process, potentially causing device software corruption and malfunction

Ranked causes

1. Power interrupted during software upgrade (rare)

First check

Verify software version after upgrade

Test point: Main Screen > Main Menu > About screen > Processor field
Expected: Software version matches installed version

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

Software upgrade fails or device corrupts

Device power interrupted during software upgrade process, risking firmware corruption and device malfunction

Ranked causes

1. Power loss or device power-off during upgrade (rare)

First check

Verify Rad-97 is powered and plugged in

Test point: Power status
Expected: Device powered on or ready to power on

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

Software upgrade interruption caution

Device powers off unexpectedly during software update process, risking firmware corruption.

Ranked causes

1. Power loss or manual shutdown during upgrade (occasional)

First check

Verify Rad-97 has power before starting upgrade

Test point: Power connection
Expected: Device plugged in and functional

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

Software upgrade needed caution

Device requires software update via USB drive for proper operation or after battery replacement

Ranked causes

1. Outdated or incompatible software version (unknown)

First check

Verify current software version

Test point: Main Screen, Main Menu, About screen, Processor field
Expected: Software version matches intended upgrade version

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

Speaker does not produce sound

Speaker fails to respond to volume adjustments; no audio output during Speaker Test

Ranked causes

1. Speaker defective or disconnected (unknown)

First check

Perform Speaker Test with volume adjustments

Test point: Sounds settings menu
Expected: Speaker responds and sounds in relationship to volume adjustment

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

Speaker not producing audio during speaker test

Speaker fails to respond or produce sound when alarm volume or pulse tone volume adjusted

Ranked causes

1. Speaker defect or internal connection failure (unknown)

First check

Access Sounds settings with Rad-97 powered on

Test point: Sounds settings menu
Expected: Settings menu accessible

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

Touch screen is not responsive

Touch functionality does not respond to finger input; no commands execute from screen touches

Ranked causes

1. Internal touch controller failure (rare)

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

Error codes

Code	Meaning	Trigger	Severity
`Red X battery icon`	Battery not properly connected or identified	Power-on after battery replacement when cable is unseated	warning

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.