USL JSD-60 Manual - Manual (Page 55)

Page 55
Appendix C – System Restore and Power-Up Buttons
System Restore
The JSD-60 has several methods of recovering from an unlikely failure. These are detailed below.
Bypass Mode
When the JSD-60 main power switch is off and the bypass power supply is plugged in, independent bypass circuitry
creates a mono sum of the selected analog or digital input audio and routes it to the left and right outputs. A quick
way of recovering from a system failure is to turn the JSD-60 off.
Restore Factory Firmware
If a firmware update of the main (PIC) processer is interrupted, it is possible to leave the system inoperable. To
restore the factory installed firmware, turn off the JSD-60, then hold down buttons 4 and 6 (Option and Non/Sync)
while turning the power back on. The message “Firmware Update Running” gets displayed and when completed
the JSD-60 will restart with the original firmware. The interrupted firmware update can then be repeated. This
only restores the PIC firmware, not the DSP or Front Panel firmware. Ensure the versions for each are from the
same code package.
Load Configuration from SD Card
The SD card is used as a "personality module" in the JSD-60. Should a JSD-60 be replaced, all the saved settings
from the old unit can be easily loaded in to the new unit without the use of a computer. These settings were saved
during the initial configuration using the SD Card Backup button on the GUI. To restore the settings to a new JSD-
60, insert the card from the old unit (behind the removable cover on the rear panel) in the new unit. With the JSD-
60 off, hold down buttons 6 and 7 (Non/Sync and MIC) down while turning on the power. Continue to hold the
buttons about 30 seconds until the bypass LED stops flashing. The configuration will be loaded and copied to the
internal non-volatile memory. The JSD-60 is now configured the same as the previous unit. The configuration data
is written as a text file that can be opened using a text editor like Note Pad. The file can also be opened with the
GUI and then transferring the settings to the connected unit, or just read to review settings.
Power-Up Buttons
The JSD-60 checks the state of front panel buttons during power up to determine if some special action is required.
During normal operation, no front panel buttons are down during power up. The table below describes the
response of the JSD-60 when buttons are held down during power up.
Buttons Action
Option, Non/Sync Restores factory installed PIC firmware and configuration. Hold buttons until the
display reads “Firmware Update Running”. Does not restore DSP or front panel
firmware.
Non/Sync, MIC Loads configuration from SD card and saves to external flash. This is usually used when
swapping out a JSD-60, as described above.