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MR850 Technical Manual * Revision J * Issued November 2005 * Ref. 185041340 (185041713 internal)
42
7.2.6 Installing New Software
NOTE: A software upgrade kit is required.
Some software may not be available in your country. Refer to your local Fisher & Paykel
Healthcare representative for the appropriate part number:
Single ROM pack 32 ROM Pack
GJU model 043042459 043042461
JHU model 043042458 043042460
All other models 043042066 043041255
Figure 7.8 Showing location of U3
1. Open the case (section 7.2.1).
2. Remove ROM integrated circuit U3 (Figure 7.8) using appropriate tools.
3. Place new ROM into the empty socket, ensuring correct orientation.
4. Close the case (section 7.2.8)
5. Turn the humidifier upside down; use a non conducting tool to hold the production test
button down. This button is accessible through the right air vent slot (when looking at the
rear of the humidifier). See Figure 7.9.
WARNING:
Never use an electrically conducting tool to depress the production test button, as there
are live mains voltages inside the humidifier.
Figure 7.9 Showing Location of the Production Test Button