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Resumen del manual
Cut the cable tie holding the heaterplate and chassis wires together. The power board and heat sink assembly can now be removed by flexing the case sides away from the top edge of the board and moving the board forward slightly to disengage from the case. The board should now be lifted slightly to clear the lower retaining guides and moved further forward to gain access to the various wiring harness connectors which can now be detached. Before removing the PCB, unscrew the mains cord connections and cut the cable tie holding the mains cord in place. 7.3 COMPATABILITY 7.3.1 HARDWARE COMPATABILITY • If a revision D or earlier power or control PCB needs to be replaced, then both PCBs need to be upgraded together to ensure correct performance. Revision F and later PCBs can be replaced individually. • To upgrade both PCBs and the software use a PCB service upgrade kit. The part numbers to order are as follows: Model Part number Model Part number MR480 043040791 MR720 043040793 MR700 043040792 MR730 043040794 • For humidifiers with Rev F or later PCBs, you will only be required to purchase individual boards for repairs (as detailed in sect. 8.9). • If a revision H or later power PCB needs replacing, the replacement power PCB must also be revision H or later. Replacing revision F or earlier power PCB MR700/720/730 Ref. 185040646 MR730/720/700/480 Technical Manual . Revision F . Issued March 2001 18 If you are fitting a Revision H or later power PCB to a Humidifier that has a revision F or earlier control PCB , you will have to ensure correct phase polarity on the transformer secondary wires. To check for correct polarity, turn the humidifier on, if the humidifier displays F-2, then the polarity of one of the transformer secondaries needs to be changed. This is accomplished as follows: i. Unplug the power supply and then unplug the transformer secondary connector (Connector J9) from the power PCB. ii. Then carefully remove the two yellow wires from the connector housing by depressing the locking tabs on the back of the connector terminals and pulling the wires out of the housing. iii. Insert the yellow wires in to the connector housing in reverse order to what they were before. See below. EXISTING WIRINGYELLOW YELLOW WHITE WHITE SECONDARY J9 NEW WIRING AFTER POLARITY SWAPPED YELLOW YELLOW WHITE WHITE SECONDARY J9 Replacing revision F or earlier power PCB MR480 If the existing power PCB is Rev. F or earlier, there will be an earth wire from the secondary harness of the transformer to the chassis. Unclip this wire from the transformer connector and unscrew it from the chassis. The Rev. J replacement power PCB will have an earth wire attached to the PCB. Fit the end of this earth wire to the earth stud on the chassis. 7.3.2 MR480 TRANSFORMERS For MR480’s , the transformer secondary wiring changed when Rev. J PCB started. When replacing the transformer, follow the instructions supplied in the transformer replacement kits to ensure compatability. 7.3.3 SOFTWARE COMPATABILITY Software versions 1.0 and 2.0 can be upgraded to version 3.0 in their existing PCBs. Software version 1.0 should be replaced with version 3.0 if the PCB’s are upgraded. Software versions 2.0 and 3.0 are compatable with all PCB revisions. 7.4 HEATERPLATE To reset the 118 °C over temperature cutout, separate the case front from the case body, then push the reset button (through a small hole under the heaterplate in the front panel case assembly). To replace the heaterplate: 1 Separate the case front from the humidifier body. 2 Unclip the Power PCB from the case body (see § 7.2.2 above). 3 Unplug the heaterplate wires from the Power PCB (connectors J3 and J7). 4 Unscrew the earth screw on the chassis for the heaterplate earth wire. 5 Unplug the ribbon cables from the Power PCB to the Control PCB (connectors J1 and J2). The front case assembly is now separate from the case body. 6 Detach the heaterplate from the case front by unscrewing the three screws which secure it to the case front. 7 Assembly is the reverse of the above procedure. Ref. 185040646 MR730/720/700/480 Technical Manual . Revision F . Issued March 2001 19 7.4.1 HEATERPLATES WITH SCREW-IN STANDOFFS For products after S/N:9773XXX19731, the heaterplate standoffs were changed to shoulder bolts that screwed directly into the heaterplate. When fitting these heaterplates,‘click’ the heaterplate springs into the recesses on the heaterplate (by rotating them while pushing down), then align the springs with the holes in the case front and screw in the self tapping standoffs into the heaterplate. 7.5 FAULT LOCATION If neither the digital display nor any of the front panel LED’s are on and no power appears to be reaching the transformer primary, check that the mechanical overheat protector on the heaterplate has not cut out. This may be checked by depressing the red reset button. (See § 7.4). Determine if all power supplies are operational and all fuses are intact. If the power supplies are OK but t...
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