GE MAC 3500 Service Manual page 108

5-26
Maintenance: Main CPU Board Replacement
the device. If the primary boot code cannot detect a valid code within 2 minutes and
6 seconds, the device shuts down.
Because the device's display is not available when the software application cannot
be found, the onboard LEDs, DS1 (Red) and DS2 (Green), flash status codes to
indicate progress. To ensure the LEDs are visible, the device's top cover must be
removed before you begin the installation.
NOTE
A copy of the primary boot program (pages with ID "Bn" where n is the 3-bit
PCB ID code 1-8) is kept in NAND FLASH. This is updated when the software
is updated. For 006 and 007 boards, the FPGA image is X3 and the primary
boot code image is B3. For 008 board, the FPGA image is X4 and the primary
boot code image is B4.
1. To prevent the system from shutting down during the update, reset the system's
timeout controller by doing the following:
a. Disconnect the device from AC power.
b. Remove and reinsert the battery.
See "Battery Replacement"
2. Remove the top cover.
This is required to make the on-board LEDs visible. See
Keyboard/Top Cover Assembly"
3. Connect the device to AC power.
Keep the device connected to AC power during the software update.
4. Insert the SD card with the required application software.
Before inserting the SD card, confirm that the dummy file update.com is located
in the card's root directory.
5. Power on the device.
NOTE
Do not power off the device during the update.
The on-board LEDs flash a series of codes to indicate installation progress.
Refer to the following table for a description of those status codes.
DS1 (Red) DS2 (Green)
Off Flashing
Off
Off
On
Flashing Flashing
Flashing
MAC™ 3500 Resting ECG Analysis System
2021337-036
on page 5-6 for instructions.
on page 5-14 for details.
Status
No SD card detected for software updated.
On Copying image files from SD card to SDRAM.
Off Erasing and/or formatting the NAND FLASH.
Applicable only during the software update
process.
Off Programming the NAND FLASH.
Successful completion of programming.
Off Error — Could program all the image files but
error in programming the status page 'Z0'
"Removal of
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