Fisher & Paykel MR720, MR730, MR700 Performance Check MR480, Dual Probe Temperature Test

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iv

 

4.0 CIRCUIT OPERATION

9

4.1

Introduction

9

4.2

Control Board

9

 

4.2.1

Control Thermistors

9

 

4.2.2

Input Analog Switches U8 and U9

9

 

4.2.3

Analog to Digital Converter U10 b,d,e

9

 

4.2.4

Processor Control U3

9

 

4.2.5

Power Line Interrupt (Revisions D/F PCBs)

10

 

4.2.6

Power Line Interrupt (Revision H PCB and later)

10

 

4.2.7

41 °C Comparator

10

 

4.2.8

Heaterplate Overtemperature

10

 

4.2.9

Watch Dog

10

4.3

Power Board

11

 

4.3.1

Revision D/F PCBs

11

 

4.3.2

Revision H AND J PCBs

11

4.4

Probe Temperature versus Thermistor Resistance

11

5.0 CALIBRATION

12

5.1

Introduction

12

5.2

Equipment Required

12

5.3

Calibration Procedure for Models with Revision D PCBs or earlier

12

5.4

Calibration Procedure for Models with Revision F PCBs or later

12

6.0 PERFORMANCE CHECK

14

6.1

Introduction

14

6.2

Performance Check MR730/720/700

14

 

6.2.1

Equipment Setup Notes:

14

 

6.2.2

Setup

14

 

6.2.3

Temperature Control Check MR700/720/730

14

 

6.2.4

Alarms check MR700/720/730

15

6.3

Performance Check (MR480)

15

 

6.3.1

Equipment Required

15

 

6.3.2

Setup

15

 

6.3.3

Temperature Control Check (MR480)

15

 

6.3.4

Alarms check - MR480

16

6.4

Dual Probe Temperature Test

16

 

6.4.1

Equipment Required

16

 

6.4.2

Test Procedure

16

7.0 SERVICING INFORMATION

17

7.1

Introduction

17

7.2

Printed Circuit Board Removal

17

 

7.2.1

Control PCB

17

 

7.2.2

Power PCB

17

7.3

COMPATABILITY

17

 

7.3.1

Hardware compatability

17

 

7.3.2

MR480 Transformers

18

 

7.3.3

Software compatability

18

7.4

Heaterplate

18

 

7.4.1

Heaterplates with screw-in standoffs

19

7.5

Fault Location

19

7.6

Screw Torque Settings

19

Ref. 185040646 *MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001

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Contents D E L S MR730 MR720 MR700 MR480 Auckland, New ZealandRevision F changes Section Description of Change National OfficeContents Dual Probe Temperature Test Performance Check MR480Power PCB Harness Connection Diagram Maintenance Schedule B1.1Maintenance Schedule Checklist 10.1Appendix D MR700 Series General Specifications Models MR730/720/700EOH SETTOP RSDOperating Controls and Modes MR700 Series Humidifiers with Version 1.0 SoftwareStandby Button MR700/720/730 only 2 MR720 Version 2.0, 3.0 Software 1 MR700/MR730 ALL Software VERSIONS, MR720 Version 1.0 onlyAlarms and Indicators Version 1.0 and Version 2.0 Software Version 3.0 SoftwareAudio Alarm Circuit Operation Power Line Interrupt Revisions D/F Pcbs Revision H and J Pcbs Calibration For models with Revision D PCB and earlierPage Performance Check Alarms Check MR700/720/730 Dual Probe Temperature Test Replacing revision F or earlier power PCB MR700/720/730 Servicing InformationReplacing revision F or earlier power PCB MR480 Fault Location SCHEMATICS, Part Lists and Mechanical Drawings Power Board Control Board Component Layout Revision F PCB Page This page Left Blank Circuit Diagrams Revision H and J PCB Control PCB Circuit Diagrams Revision H and J PCB Power PCB Circuit Diagrams Revision F PCB Control PCB Circuit Diagrams Revision F PCB Power PCB DSP1, DSP2, DSP3 LED1, LED3LED2,LED4, LED5,LED11 LED6,LED7 LED8,LED9,LED10SW5 SPK1VR1 VR4Fuse fast acting 2 a 20 × 5 mm for 230 999830009 MR480AGM Exploded Diagrams MR480 10.3 MR730/720/700 Mechanical Parts MR720ASU Exploded Diagrams MR730/720/700 Heaterplate Assembly Parts MR730/720/700/480 Page PCB Identification Diagram Power PCB Harness Connection Diagram Product Change History Date Change First Serial Number Comments AffectedAAA Xxxxx Year Model Code Serial NumberAppendix a OFFError Messages A2.3 Integral DisplayEP1 EP2EP3 EP4Second Byte First ByteThird Byte A5.4 Serial Data Interface Connector B1 Maintenance Schedule Appendix BPhotocopy and File in Maintenance Records Electrical Safety Checks as requiredAppendix C Possible cause Action to takeHigh Temperature C1.5 C1.6LED on Check Voltage Rating Of Unit Cleaning instructions Appendix DSetup Notes Appendix EDynamic Test Sequence MR730/720/700 Dynamic Test Procedure MR480