natus neoBLUE User manual

Service Manual

Caution: Federal Law (U.S.) restricts this device to sale or use by or on the order of a physician (or properly licensed
practitioner).
neoBLUE is a registered trademark of Natus Medical Incorporated.
Biliblanket is a registered trademark of Ohmeda Medical.
Bili-meter is a registered trademark of Olympic Medical.
© 2006 Natus Medical Incorporated. All rights reserved.
This manual may not be reprinted or copied in whole or in part without written consent from Natus Medical Inc. The
content of this manual may change without notice.
Corporate Headquarters
Natus Medical Inc.
1501 Industrial Road
San Carlos, CA USA 94070
Telephone [phone]
Fax [phone]
Technical Service [phone]
E-mail [email protected]
European Office
EU Representative
Fischer-Zoth Dianosesysteme GmbH
Walter-Kolbenhoff-Str. 34
D-82110 Germering
Germany
Telephone [phone]
Fax [phone]
E-mail [email protected]
www.natus.com
Phototherapy System and Device: Patent Application Pending 10/265,970
neoBLUE®LED Phototherapy System Service Manual
P/N 051296

neoBLUE® LED Phototherapy System Service Manual 1
PN 051296
Table of Contents
CHAPTER 1 Introduction
1.1 About this manual 5
1.1.1 Overview 5
1.1.2 Intended users 6
1.1.3 Manual conventions 6
1.2 Product description 6
1.3 Pictorial introduction to the neoBLUE system 7
1.4 Before you start 14
1.5 Contacting Natus Technical Support 14
CHAPTER 2 Routine Maintenance Procedures
2.1 Cleaning 15
2.1.1 Cleaning the light enclosure and accessories 16
2.1.2 Cleaning the light enclosure air filters 16
2.2 Safety testing 17
2.3 Performance Verification 18
2.3.1 Verifying general performance 19
2.3.2 Checking the light intensity 20
2.4 Adjusting light intensity 22

Table of Contents
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CHAPTER 3 Troubleshooting Guide
3.1 Troubleshooting the neoBLUE light 23
3.2 Troubleshooting the LED light current assembly 26
CHAPTER 4 Repair procedures
4.1 Removing the light diffuser 30
4.2 Removing the LED light panel 32
4.3 Removing the subplate 33
4.4 Removing components from the subplate 35
4.4.1 Removing the power supply assembly 36
4.4.2 Removing the LED light current assembly 37
4.4.3 Removing the subplate fan assembly 37
4.4.4 Removing the LED light panel cable 37
4.5 Replacing the subplate 38
4.6 Removing components from the enclosure 38
4.6.1 Removing the enclosure fan 39
4.6.2 Removing the AC power entry module 40
4.6.3 Removing the rocker switches 40
CHAPTER 5 Parts and Specifications
5.1 How to order parts 41
5.2 Parts in context 42
5.3 Parts list 45
5.4 Illustrations of major parts 50
5.5 Accessory pack 51
5.6 Specifications 53
Appendix: Technical Note on Photometers 55
Index 57

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List of Tables and Figures
Tables
TABLE 2-1 Ground Integrity 17
TABLE 2-2 Earth leakage current 17
TABLE 2-3 Enclosure leakage current 18
TABLE 2-4 Equipment 18
TABLE 3-1 Troubleshooting Guide 24
TABLE 4-1 Equipment 30
TABLE 4-2 Equipment 38
TABLE 5-1 Parts List for Natus neoBLUE system 45
TABLE 5-2 Accessory Pack 52
TABLE A-1 neoBLUE Light Intensity Output Conversion Chart 56
Figures
FIGURE 1-1 External, front view 8
FIGURE 1-2 External, rear view 9
FIGURE 1-3 Internal, view from top 10
FIGURE 1-4 Power supply 11
FIGURE 1-5 LED light current assembly 12

List of Tables and Figures
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FIGURE 1-6 Block diagram 13
FIGURE 2-1 Locating the filter 16
FIGURE 2-2 Measuring distance 20
FIGURE 2-3 Adjusting the potentiometers 22
FIGURE 4-1 Removing the diffuser 31
FIGURE 4-2 Removing the LED light panel 32
FIGURE 4-3 Detaching the subplate 34
FIGURE 4-4 Subplate components 36
FIGURE 4-5 Enclosure components 39
FIGURE 5-1 Subplate and its attachments 43
FIGURE 5-2 Enclosure and its attachments 44
FIGURE 5-3 LED light panel (item #1) 50
FIGURE 5-4 Enclosure (item #2) 50
FIGURE 5-5 Subplate (item #3) 51
FIGURE 5-6 LED light current assembly (item #4) 51

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CHAPTER 1 Introduction
In this chapter:
1.1 About this manual 5
1.2 Product description 6
1.3 Pictorial introduction to the neoBLUE system 7
1.4 Before you start 14
1.5 Contacting Natus Technical Support 14
1.1 About this manual
1.1.1 Overview
This manual contains information needed for servicing the neoBLUE Phototherapy System.
•Description of the product and overview illustrations (Chapter 1)
•Troubleshooting guide (Chapter 2)
•Maintenance procedures (Chapter 3)
•Repair procedures (Chapter 4)

Chapter 1 Introduction
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•Parts and ordering information. (Chapter 5)
•Conversion chart for photometers of various brands. (Appendix A)
•Index
1.1.2 Intended users
This service manual is written for qualified biomedical technicians. It describes service tasks
which could lead to injury, or which could damage the device, if attempted by a person
without the requisite skills.
1.1.3 Manual conventions
Precautionary information is emphasized by being labeled as warning, caution or important.
Other explanatory information is highlighted with the word Note.
Throughout the manual, when parts are referred to in figures or in the text, the Item Number
from the Parts List (Chapter 5) is used to identify the part.
1.2 Product description
The neoBLUE LED Phototherapy System consists of two products – the neoBLUE
Phototherapy light source (light) and the neoBLUE Phototherapy Roll Stand (roll stand).
Type of information Usage
WA R N I N G Identifies conditions or practices that may result in injury or
death to the patient and/or user. Warnings are boxed and
preceded by a hazard symbol.
CAUTION: Precedes an action that may result in damage to or
malfunction of the device.
Important! An instruction provided to help ensure correct clinical
results and provide quality assurance to the phototherapy
procedures.
Note: Background information provided to clarify a particular
step or procedure. Information in this category is not
considered precautionary.

Pictorial introduction to the neoBLUE system
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These components provide a floor-standing, mobile, phototherapy light that delivers a narrow band
of high-intensity blue light via blue light emitting diodes (LEDs) to provide treatment for neonatal
hyperbilirubinemia.
Blue LEDs emit light in the range of 400 – 550 nm (peak wavelength 450-475 nm). There are two
light intensity settings, high and low. The light output is optimized to provide an average intensity
of 30-35 µW/cm2/nm at the high setting and 12-15 µW/cm2/nm at the low setting at 30 cm (12
inches) distance from the light enclosure.
LEDs have minimal light output degradation over their lifetime with proper use. Nevertheless, the
technician can adjust the output of the LEDs using two potentiometers located on the side of the
light enclosure. The light is expected to operate as specified at least 10,000 hours at the low
setting, and at least 3,000 hours at the high setting.
The roll stand is designed to hold 8 lbs of weight with a base designed to accommodate the weight
distribution of the light enclosure at any height or angle.
The light is mains-power operated. The power cord plugs into a receptacle at the power inlet at the
back of the light enclosure. A power cord strain relief bracket is provided to hold the power cord in
place.
1.3 Pictorial introduction to the neoBLUE system
This section is meant to acquaint you with the various views of the neoBLUE light that you will see
in the course of troubleshooting and repairing it. The item numbers and names used in the Parts
List (see Chapter 5) are used throughout the book whenever parts are discussed.
These pictures show the front and rear views of the light enclosure, and internal views showing
where the major components are located and some details. Also included is a block diagram.
WARNING Eye Protection: Do not look directly into the LEDs. Some people are
sensitive to blue light in the environment. Amber safety glasses shield
sensitive eyes, minimizing the effects of the blue light.
WARNING If an alternative stand is used, care must be taken to validate the load
capacity.

Chapter 1 Introduction
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FIGURE 1-1 External, front view
Item Description Notes
2Enclosure
8Light intensity rocker switch Sets intensity to high or low
9Target light rocker switch Controls red target light. Momentary action.
13 Calibration access cover Covers potentiometers for adjusting light intensity
23 Self tapping screw
24 Screw, 5/8”
89
23 24(x2) 13
2

Pictorial introduction to the neoBLUE system
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FIGURE 1-2 External, rear view
Item Description Notes
2Enclosure
6Diffuser Diffuses the light from the LEDs
7AC power entry module Includes on/off switch (I/0); fuses
12 Enclosure fan filter assembly Consists of a cover, filter, and backplate
23 Self tapping screw Location for power cord strain relief bracket
29 Thumbscrew For attaching enclosure to roll stand
30 Locating post screw Slotted
AAir vent Consists of an enclosure fan filter assembly with-
out a filter
29 12
A
2
23 730 6

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FIGURE 1-3 Internal, view from top
Item Description Notes
1LED light panel
3Subplate Holds power supply, assembly, and subplate fan
4LED light current assembly
5Power supply
6Diffuser Diffuses the light from the LEDs
7AC power entry module Includes on/off switch (1/0); fuses
1
10
4
5
7
89
11
14
6
3
A

Pictorial introduction to the neoBLUE system
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FIGURE 1-4 Power supply
s
8light intensity rocker switch For selecting intensity level
9Target light rocker switch Indicates center of treatment area
10 Enclosure fan Cools the enclosure
11 Vent guard
14 Subplate fan Cools the LED light panel and diffuser
A Mounting plate Mounts light to roll stand
Item Description
A 24 volt ground
B 24 volts +
C Ground spade
D AC inlet
Item Description (Continued) Notes
B
AC
D

Chapter 1 Introduction
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FIGURE 1-5 LED light current assembly
The block diagram, Figure 1-6, lays out the electrical connections.
ALED light panel header, J1
BMain power, fan header, J2
CFront panel switch header, J3
DLight intensity adjustment potentiometers
A
B
C
D

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FIGURE 1-6 Block diagram
AC power entry module
Enclosure fan Mounting
plate
Target light rocker switch
Light inten- sity rocker switch
Subplate fan
LED light current assembly
Power supply
LED light panel
Items in dotted rectangle are mounted on enclosure.

Chapter 1 Introduction
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1.4 Before you start
1.5 Contacting Natus Technical Support
Should you encounter situations that are not covered by this Service Manual, contact a Natus
Technical Support representative.
Please have your Natus device model and serial number available when calling Technical
Support.
United States customers: Contact a Natus Technical Service Representative at:
Telephone: [phone]
Fax: [phone]
Email: T[email protected]
European office:
Telephone: [phone]
Fax: [phone]
Email: [email protected]
WARNING Observe Electrostatic Discharge (ESD) precautions when handling,
adjusting, or performing any procedure with the device internal
components.

neoBLUE® LED Phototherapy System Service Manual 15
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CHAPTER 2 Routine Maintenance
Procedures
This chapter includes procedures for routine maintenance of the neoBLUE light, hereafter
called the Unit Under Test (UUT).
2.1 Cleaning 15
2.2 Safety testing 17
2.3 Performance Verification 18
2.4 Adjusting light intensity 22
These procedures must be performed after any of the following events and/or as prescribed by
the institution’s maintenance schedule:
•Initial receipt of the UUT at the institution.
•Foreign material or liquid has been deposited on the UUT.
•UUT has been visually damaged or subjected to mechanical shock (e.g., being dropped).
•UUT has been submitted for maintenance or scheduled performance verification.
2.1 Cleaning
Cleaning the UUT incorporates two different tasks:

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•Cleaning the light enclosure and accessories (Section 2.1.1)
•Cleaning the light enclosure air filters (Section 2.1.2)
CAUTION: Do not immerse the UUT or its accessories in liquid, or clean with caustic or
abrasive cleaners. Do not spray or pour any liquid on the UUT enclosure.
2.1.1 Cleaning the light enclosure and accessories
Clean the UUT enclosure using a cloth dampened with Germiocide™ or an equivalent product.
Wipe the exterior plastic surfaces lightly. Do not allow any liquid to penetrate the power con-
nector, switches, fans, connectors, or openings on the enclosure.
2.1.2 Cleaning the light enclosure air filters
The air filter should be cleaned at least every 30 days to prevent possible instrument
overheating.
1Remove the cover from the enclosure fan filter assembly, shown below in Figure 2-1.
FIGURE 2-1 Locating the filter
WARNING Disconnect UUT from AC power before cleaning.
WARNING Biohazard. Until UUT is disinfected per institutional requirements,
gloves and other appropriate safeguards must be employed.

Safety testing
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2Inspect the filter for damage. If damaged, it must be replaced.
3Clean the filter by holding it under warm running water to clean away dust and other foreign
materials.
4Place the filter in a clean environment and allow it to air dry. The process can be expedited by
having extra filters available for immediate replacement.
5Return a dry filter to the fan assembly and press the filter cover firmly into place.
2.2 Safety testing
The safety tests meet the standards of, and are performed in accordance with, IEC 60601-1,
Amendment 1, Amendment 2,) and UL 2601, for instruments as Class 1 and TYPE BF and ANSI/
NFPA Standard 99.
Applicable tests for these standards are listed below. Technicians must be familiar with the
standards applicable to the technician’s institution and country. Test equipment and its application
must comply with the applicable standard.
•TABLE 2-1 “Ground Integrity”
•TABLE 2-2 “Earth leakage current”
•TABLE 2-3 “Enclosure leakage current”
TABLE 2-1 Ground Integrity
100 milliohms or less
TABLE 2-2 Earthleakagecurrent
AC Polarity Line cord Neutral cord IEC 60601-1 UL 2601-1
ANSI/NFPA 99
Normal Closed Closed 500 μA 300 μA
Reversed Closed Closed 500 μA 300 μA
Normal Open Closed 1000 μA 500 μA
Normal Closed Open 1000 μA 500 μA

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2.3 Performance Verification
This section discusses the tests used to verify UUT performance
•Verifying general performance (Section 2.3.1)
•Checking the light intensity (Section 2.3.2)
All tests can be conducted without removing the UUT enclosure. If the UUT fails to conform
or cannot be adjusted to conform, repairs must be made to correct the problem before the
instrument is returned to the user.
TABLE 2-3 Enclosureleakagecurrent
AC line cord
polarity
AC line cord
neutral
conductor
AC line cord
ground
conductor
IEC 60601-1 UL 2601-1
ANSI/NFPA 99
Normal Closed Closed 100 μA 300 μA
Normal Closed Open 500 μA 300 μA
Normal Open Closed 100 μA 300 μA
Reversed Closed Open 500 μA 300 μA
Reversed Open Closed 500 μA 300 μA
Reversed Closed Open 500 μA 300 μA
TABLE 2-4 Equipment
Tools and test equipment Type
Screwdriver Phillips, medium
Photometer Ohmeda BiliBlanket® Meter II or equivalent (see Note below)
Potentiometer adjustment tool GC Electronics 8608 or small flat head screwdriver
Allen wrench 5/16” 90 degree or equivalent
Safety glasses Amber
Work pad Any non-abrasive non-static surface