Section 4: Service Mode; Introduction; Service Level 1; Information Screen - Nellcor NPB-75 Service Manual

SECTION 4: SERVICE MODE

4.1

INTRODUCTION

4.2

SERVICE LEVEL 1

4.2.1

Information Screen

4.2.2

Event Messages Screen

4.1 Introduction
4.2 Service Level 1
4.3 Service Level 2
The monitor supports a service mode built into the instrument's firmware.
To access the service mode, refer to Table 4-1: "Accessing Service Mode
and Changing Parameter Settings".
The architecture of the monitor's service mode divides the service mode
into two levels as described in the sections below.
• Service Level 1
• Service Level 2
The Service Level 1 provides information and tools on three service
screens to test and calibrate specific functions without disassembling the
monitor.
• Information Screen
• Event Messages Screen
• Interface Test Screen
From these display screens the service technician can check the operating
hours counter and event messages, test the Human Interface functions
(HMI), set the light detection threshold, adjust the LCD contrast middle
point and perform a calibration check and a calibration process, if
necessary. Refer to Table 4-1: "Accessing Service Mode and Changing
Parameter Settings".
The information screen displays the monitor's main board serial number,
the number of operating hours, and the SpO
versions.
The monitor automatically performs a series of built-in tests (BITs) at
start-up and during operation to check sub-systems and modules for
errors. The event messages screen lists the last five event messages, the
time each occurred relative to the unit's operating hours, and a
recommended service action. There are three event messages and each
has a specific response as follows:
Event Message:
CO board
2
SpO board
2
Flow
and C O boards' software
2 2
Action:
Replace CO board
2
Replace SpO board
2
Replace CO board
2
4-1