Pulse oximeters troubleshooting: models and common symptoms

10 pulse oximeters with troubleshooting records in ServiceForge. Each model page lists every documented symptom with its ranked causes and first check.

Models

• Masimo Rad-5 29 symptoms
• Masimo Rad-97 37 symptoms
• Nellcor N-20 12 symptoms
• Nellcor N-395 23 symptoms
• Nellcor N-600 16 symptoms
• Nellcor N-65 20 symptoms
• Nellcor NPB-290 9 symptoms
• Nellcor NPB-295 15 symptoms
• Nellcor NPB-40 12 symptoms
• Nellcor Oxi-Max N-595 22 symptoms

Common symptoms

• Battery does not charge Rad-97, N-395, N-600, NPB-295, Oxi-Max N-595
• Unit does not power on Rad-97, N-395, N-65, NPB-40, Oxi-Max N-595
• Alarm does not sound N-395, N-600, NPB-295, Oxi-Max N-595
• Display pixels do not light N-395, N-600, NPB-295, Oxi-Max N-595
• Alarm sounds for no apparent reason N-395, NPB-295, Oxi-Max N-595
• Display values missing or erratic N-600, NPB-295, Oxi-Max N-595
• Battery Low indicator on during DC operation with alarm sounding N-395, NPB-295
• Display backlight does not illuminate N-65, NPB-40
• Display backlight not illuminating N-20, N-65
• Power-on self-test verification NPB-40, Oxi-Max N-595
• Unit does not power up on AC or DC N-395, NPB-290

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