Troubleshooting; Introduction; How To Use This Section; Who Should Perform Repairs - Nellcor N-180 Service Manual

SECTION 5: TROUBLESHOOTING
Introduction
How to Use This Section
Who Should Perform Repairs
Replacement Level Supported
Obtaining Replacement Parts
Troubleshooting Guide
INTRODUCTION
This section explains how to find and correct equipment problems. The
troubleshooting method incorporates decision trees and associated selection
tables.
HOW TO USE THIS SECTION
Use this section in conjunction with Section 7, Performance and Safety Tests,
and Section 9, Spare Parts. To remove and replace a part you suspect is defec-
tive follow the instructions in Section 6, Disassembly Guide. The circuit anal-
ysis section, section three, offers information that can help you understand
how the monitor functions. Observe monitor operation and note symptoms.
Then scan the major paragraphs of this section for related troubleshooting
procedures. e a a
WHO SHOULD PERFORM REPAIRS
Only qualified biomedical technicians should open the monitor housing, re-
move and replace components, or make adjustments. To simplify this chapter,
these persons are identified as your "qualified service authority'. If your
medical facility does not have qualified service personnel, contact Nellcor.
Operators are only authorized to replace an entire monitor.
REPLACEMENT LEVEL SUPPORTED
These procedures support a repair scheme that envisions swapping PCBs, but
not individual discrete components such as resistors, ICs, and microproces-
sors. Once you isolate a suspected PCB, following the procedures in this sec-
tion, replace that PCB with a known good PCB and check to see that the
trouble symptom disappears and the monitor passes all performance tests. If
the trouble symptom persists, swap the replacement PCB and the suspected
malfunctioning PCB (the original PCB that was installed when you started
troubleshooting) and continue troubleshooting as directed in this section.
OBTAINING REPLACEMENT PARTS
Nellcor Technical Services provides technical assistance information and re-
placement parts. To obtain replacement parts, contact Nellcor. Refer to parts
by the part names and part numbers listed in Section 9, Spare Parts.
TROUBLESHOOTING GUIDE
Symptoms can occur in one or more of the following categories:
* Status messages on the front panel display
Front panel display problems .
e Interface problems