Software Rewrite Function On The Usb - Mitsubishi Electric CAHV-R450YA-HPB Service Manual

[ XI USB Function ]

[2] Software Rewrite Function on the USB

The USB memory stick may be used to rewrite the software of the outdoor unit in the same way as using a ROM writer.
<1> Preparation
• Prepare a USB memory stick and a portable battery charger.
A LEAD WIRE ASSY USB for connecting the control board and the charger is also necessary.
Make sure the portable battery charger is sufficiently charged.
• Prepare a countermeasure program file "******.mot" for the intended model.
• Copy the software rewrite program file "******.mot" onto the root folder of the USB memory stick.
Install only one program and only in the root folder of the USB memory stick.
<2> Rewriting Software
The procedure is shown below.
1. Operation procedure
(1) Starting software rewrite mode
1) Shut down the power for the outdoor unit. Make sure the power for the control board is off.
This is done by confirming LD2 is off.
2) Turn on switches SW7-9 of the control board.
3) Insert the USB memory stick into the USB port (CNUSB) on the control board.
4) Connect the portable battery charger to the XA connector (CN601). The control board will turn on.
5) Make sure the display "Pro" is shown on the maintenance LED (LD301)
This shows that Software Rewrite Mode has been started.
(2) Performing software rewriting
1) Wait for 5 seconds after "Pro" appeared on the LED, and press SWP3 (ENTER) to start software rewrite.
When the rewrite process is in progress, progress bars move as shown below.
2) If "End" is displayed on the LED, the rewrite process has been completed correctly. * Generally, this process takes about five
minutes.
(3) Confirmation of operation
1) Disconnect the portable battery charger from the XA connector (CN601). The control board will turn off.
2) Remove the USB memory stick from the USB port (CNUSB) on the control board.
3) Turn off the switches SW7-9 on the control board.
4) Turn on the outdoor unit, and check that the versions of the outdoor unit and the software are the same.
The version of the software may be found using the maintenance tool or other means.
Perform a test run, and check for normal operation.
HWE22020
M a i n t e n a n c e L E D D i s p l a y
- 177 -
GB