Fisher & Paykel MR850 manual 4

6	TROUBLESHOOTING .....................................................................................................................	24
6.1	OPERATIONAL PROBLEMS....................................................................................................................	24
6.2	TECHNICAL PROBLEMS ........................................................................................................................	26
6.3	“SEE MANUAL” ERROR CODES.............................................................................................................	27
6.4	DIAGNOSTIC MENU..............................................................................................................................	29
	6.4.1 Diagnostic Menu for Software Versions 5.45, 5.70...............................................................	29
	6.4.2 Diagnostic Menu for Software Version 6.00 .........................................................................	30
	6.4.3 Diagnostic Menu for Software Version 7.00 & 7.21 ..............................................................	31
	6.4.4 Diagnostic Menu for Software Version 7.14 & 7.22 ..............................................................	32
	6.4.5 Diagnostic Menu for Software Version 7.23 .........................................................................	34

7	SERVICING PROCEDURES............................................................................................................		35
7.1	GENERAL CONSIDERATIONS ................................................................................................................		35
7.2	DISASSEMBLY .....................................................................................................................................		35
	7.2.1	Opening the case..................................................................................................................	35
	7.2.2	Replacing Fuses ...................................................................................................................	36
	7.2.3 Replacement of Printed Circuit Boards (PCBs) ....................................................................		37
	7.2.4	Replacement of Transformer ................................................................................................	38
	7.2.5 Servicing the Heater Plate ....................................................................................................		38
	7.2.6	Installing New Software.........................................................................................................	42
	7.2.7 Replacing the Mains Cable ...................................................................................................		43
	7.2.8	Closing the case....................................................................................................................	43

8	PERFORMANCE TESTING .............................................................................................................		44
8.1	HUMIDIFIER PERFORMANCE TESTING ...................................................................................................		44
	8.1.1 Entering the Service Menu....................................................................................................		44
	8.1.2	Humidifier Calibration Check ................................................................................................	44
	8.1.3	Humidifier Display Test .........................................................................................................	45
	8.1.4 Humidifier Voltage Calibration Check ...................................................................................		46
	8.1.5 Humidifier Warm-up and Control Check ...............................................................................		46
8.2	PROBE ACCURACY CHECK...................................................................................................................		47
	8.2.1 Probe Temperature Accuracy Test .......................................................................................		47
	8.2.2 Probe Flow Accuracy Test ....................................................................................................		47

9	RECOMMENDED MAINTENANCE CHECKLIST............................................................................	49
9.1	HUMIDIFIER CHECK (ANNUALLY) ..........................................................................................................	49
9.2	PROBE CHECK (EVERY SIX MONTHS)....................................................................................................	49
10	SPARE PARTS.................................................................................................................................	51
11	CALIBRATION PROBE ...................................................................................................................	55
12	SERIAL PORT & LOGGING SOFTWARE ......................................................................................	56
12.1	INTRODUCTION...............................................................................................................................	56
12.2	INSTALLATION.................................................................................................................................	56
12.3	OPERATING INSTRUCTIONS .........................................................................................................	56
	12.3.1 Viewing Humidifier Data........................................................................................................	56
	12.3.2 Logging Humidifier Data to File.............................................................................................	57
13	EMC INFORMATION........................................................................................................................	58
14	PRODUCT CHANGE HISTORY.......................................................................................................	60

4 MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)