Troubleshooting - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[9-4 Maintenance LED Display and Troubleshooting ]
9-4-2

Troubleshooting

Troubleshooting of USB functions are shown below.
The displays on the maintenance LED described in Section [9-4-1 Maintenance LED Display Content List]may also be used as a
reference.
1. Storing on a USB memory stick
(1) Maintenance LED does not display "USB."
(Meaning or Cause)
The system was not started in Storage Mode.
The USB memory stick is not connected. Or, switch SWP3 may not be pressed deeply enough.
(Solution)
Check the connection of the USB memory stick, and try again using Section [9-2-2 Storing Data on a USB Memory Stick]as
a reference.
Hold down the switch SWP3 until "USB" is displayed on the maintenance LED.
If the problem persists, there may be a problem with the USB memory stick.
Check if the USB memory stick meets the specification described in Section [9-1-3 Necessary Materials](1) USB memory
stick.
If compliance is confirmed, the USB memory stick may be broken. Replace it with a new one.
(2) Pressing the switch SWP3 does not start data storage, and the maintenance LED continues to
display "USB."
(Meaning or Cause)
There may be a problem with the USB memory stick.
(Solution)
Check the connection of the USB memory stick.
If no problem is found, the USB memory stick may be at fault.
Check that the USB memory stick meets the specification described in Section [9-1-3 Necessary Materials](1) USB memory
stick.
If compliance is confirmed, the USB memory stick may be broken. Replace it with a new one.
(3) Maintenance LED displays "Er01."
(Meaning or Cause)
Because there was a problem regarding the USB memory before the start of data storage, data storage has not been com-
pleted.
(Solution)
Check the connection of the USB memory stick.
If no problem is found, the USB memory stick may be at fault.
Check the following three items.
Compliance of the USB memory stick to the specification described in Section [9-1-3 Necessary Materials](1) USB memory
stick.
Available free space of the USB memory stick exceeding 50 MB.
The maximum number of folders or files is not exceeded. When folders are created in the USB memory stick, the upper limit
of folders is 101, including those files from "Mnt000" to "Mnt100." When files are created in the USB memory stick, the upper
limit of files is 101, including those files from "MNT000.MT" to "MNT100.MT."
Delete unnecessary folders or files.
When there is no problem in the above, the USB memory stick may be broken. Replace it with a new one.
(4) Maintenance LED displays "Er02."
(Meaning or Cause)
Because there was a problem regarding the USB memory during data storage, data storage is unfinished.
For example, if the USB memory stick is disconnected during data storage, this display appears on the maintenance LED.
(Solution)
Check the connection of the USB memory stick.
If no problem was found, remove the USB memory stick from the control board and insert it again. Then conduct data storage
referring to Section [9-2-2 Storing Data on a USB Memory Stick].
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