B
CUES Inc.
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MPlus+ User Manual | CH905
89
www.cuesinc.com
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APPENDIX B
TROUBLESHOOTING:
The following is a list of the error messages provided by the MPlus+ firmware update
program, along with a description of what each indicates and some potential causes.
NOTES:
1. All of the below error messages can, additionally, be caused by communication problems
with the attached USB Flash drive, which can be caused by poor connection between the
contacts in the drive and those in the USB connector.
2. If the error message description does not provide a solution, try pulling the USB Flash
drive out and plugging it back in, and then retry the procedure from step 6.
3. If failures persist, retry the procedure from the beginning with a different USB Flash drive.
• NO USB DEVICE FOUND
o A USB device is not plugged into the USB port, J4, on the circuit board attached to the
underside of the keyboard panel.
• USB COMMUNICATION ERROR
o The system is having unspecified problems communicating with the attached USB
device.
• UNSUPPORTED CONFIG DSCRPTR
o The ‘Configuration Descriptor’ data received from the USB device was too large to fit
into the internal buffer.
o This is an uncommon error that should only occur when using a non-standard USB
Flash drive or when the attached USB device is something else entirely.
• UNSUPPORTED USB DEVICE
o The attached USB device has not been identified as a ‘Mass Storage Device’, which is
the standard classification for USB Flash drives.
o Check the state of the slide switch, S1, on the circuit board attached to the underside
of the keyboard panel. Make sure it is set to the ‘UPD’ position for performing the
firmware update.
• UNSUPPORTED LOG BLOCK LEN
o The ‘Logical Block Length’ reported by the USB Flash drive is not equal to the value,
512 bytes, supported by the MPlus+ firmware update program.
o This is an uncommon error that should only occur when using a non-standard USB
Flash drive.
• UNSUPPORTED NUM LOG BLOCKS
o The number of ‘Logical Blocks’ reported by the USB Flash drive exceeds the maximum
number supported by the MPlus+ firmware update program.
o If the drive’s ‘Logical Block Length’ is the standard 512 bytes, this equates to
approximately 2TB of memory capacity.
