Service manual

Section 5: Troubleshooting
5-2
5.6 TROUBLESHOOTING GUIDE
Problems with the NPB-190 are separated into the categories indicated in Table
5-1. Refer to the paragraph indicated for further troubleshooting instructions.
Note: Taking the recommended actions discussed in this section will correct
the majority of problems you will encounter. However, problems not
covered here can be resolved by calling Mallinckrodt Technical
Services or your local representative.
Table 5-1: Problem Categories
Problem Area Refer to Paragraph
1. Power
• No power-up on AC and/or DC
• Fails power-on self-test
• Powers down without apparent cause
5.6.1
2. Buttons
• Monitor does not respond properly to
buttons
5.6.2
3. Display/Alarms
• Displays do not respond properly
• Alarms or other tones do not sound
properly or are generated without apparent
cause
5.6.3
4. Operational Performance
• Displays appear to be operational, but
monitor shows no readings
• Suspect readings
5.6.4
5. Serial Port
• NPB-190 and PC not communicating
properly
• Nurse Call not functioning properly
5.6.5
All of the categories in Table 5-1 are discussed in the following paragraphs.