How To Update The Firmware - JVC GY-HM790U Service Manual

5.2.2 IEEE1394 ID setting method
IEEE1394 equipped units have an ID, as defined by the IEEE1394 standard, stored in the internal EEP-ROM (IC1504). At the time of
production, the ID numbers allotted to each individual unit are written into the unit's memory, and a label bearing the ID is affixed inside
the unit. When the EEP-ROM or MAIN circuit board is replaced, the ID needs to be set again.
(1) Procedure for setting IEEE1394 ID
The ID is an 8-digit hexadecimal code with 1 high-end Byte being the model code, and 3 low-end Bytes being unique to the unit.
The model code is automatically initialized, so only the lower 3 Bytes of unique code need to be set manually.
Start from [SERVICE MENU] → [OTHERS] Menu → [MEM. EDIT] (Memory Edit) to select the address in the ID data section
and make the setting directly.
The 3 low-end Byte address is as follows. Make the setting while checking the ID printed on the label (ID: 85xxxxxx) affixed inside
the GY-HM790.
IEEE1394 ID data :
MEMORY Address number : "39C" "39D" "39E"
(2) Setting procedure
a) Move the cursor to [MEM.EDIT], then press the [Set] button or the [Cross-Shaped] button (right).
b) The ADR parameter blinks. Select [39C], then press the [Set] button or the [Cross-Shaped] button (right).
c) The DATA parameter blinks. Set the ID written on the label.
d) Press the [Set] button or the [Cross-Shaped] button (right) to set the parameter. The parameter lights up.
e) Follow the same procedure above to set IDs for ADR parameters [39D] and [39E].
f) Move the cursor to [BACK], then press the [Set] button or the [Cross-Shaped] button (right) to go back to the upper layer
and finish the setting.
5.3

HOW TO UPDATE THE FIRMWARE

NOTE:
• When replacing CAM board or CODEC board, the firmware update is required to maintain combination with other CPU versions.
• Do not turn OFF the power during the update, Otherwise the CPU may be destroyed and replacement of IC or board may be
required.
• Use an AC adapter for updating. Do not use a battery for firmware update.
• When the update is failed, audio AUTO LED's are flash alternately. In this case, remove the SD memory card, then try the update
again.
• Remove the IEEE1394 cable, or it may cause troubles on the GY-HM790.
• Do not format the SD memory card by PC.
The SD memory card formatted on the PC may not work correctly. Format the SD memory card on the GY-HM790 if formatting
is required.
• You can also use the SD memory cards formatted with digital still cameras, or formatted using formatting software supplied from
SD memory card manufacturer such as Panasonic.
5.3.1 Preparation (Copy the firmware to SD memory card)
NOTE:
• The update file is named as "GY-HM790.UPD".
• The update file should be put on the directory "//PRIVATE/JVC/GY-HM790", otherwise the update is not executed.
(1) Download the update file from JS-NET SMIS and unzip it to a PC.
(2) Insert the SD memory card to the PC and confirm that no file is in the SD memory card. If there are some files, delete them.
(3) Make the directory "//PRIVATE/JVC/GY-HM790" on the SD memory card.
(4) Copy the unzipped update file to the folder "GY-HM790" on the SD memory card.
1-28 (No.HC034<Rev.001>)
87 x x x x x x
(Each 1 Byte ID data are stored for every one memory address number.
ID Label