Service manual

Rad-8 Signal Extraction Pulse Oximeter Service Manual
6-2
6.3 Troubleshooting
6.3.1 The troubleshooting procedures in this manual instruct the
technician to isolate the failure down to the sub-assembly level.
The intention is to have the Unit Under Test (UUT) repaired with
minimal steps. The Masimo SET Tester is needed to perform
the Performance Verification in Section 4-1 upon completion of
repairs.
Note: The Masimo SET Tester is not a calibrated device. It is to be
used for evaluation purposes only and not to determine if an
Oximeter is “calibrated”.
6.3.2 Tools required are as follows:
Phillips head screwdriver
6.3.3 The troubleshooting steps below are presented in order of the
most probable cause first. Proceed to the next step only if the
unit continues to fail.
Symptom Cause and Corrective Action
Steps
• Speaker Alarming (very
loud) and unit is not
functioning or displaying.
• Probable Watchdog error.
1. Replace System board.
2. Replace User Interface board.
• Alarm LED does not
Illuminate
1. Unit must be in alarm state.
2. Audible alarm can be heard.
1. Replace User Interface board.
2. Replace Display board.
•
Alarm Condition But No
Audible Indication.
1. Unit is in alarm condition.
1. Replace Speaker.
2. Replace System board.
• Display Missing Segments
1. Replace User Interface board.
2. Replace Display board.
• Button Function Error
1. Any front panel button
Affected.
2. Buttons do not activate
feature.
1. Replace Keypad.
2. Replace User Interface board.
• "No Sen", or “Sen Off”
Displayed.
1. Cable is connected with
sensor attached.
1. Replace sensor.
2. Replace patient cable.
3. Replace flex cable.
4. Replace oximeter board.