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For all other Frame IDs, the DSP performs special functions as described in Special DSP ID Codes (p. 16).
These steps are described in detail in the sections that follow.
A. Power-On Self Test
During the first stage of power-on boot, the LX-DSP processor module waits for the LX-300 power and bus signal
conditions to stabilize. It then tests its main SDRAM memory circuits and loads the next stage of boot software.
1. Power is turned on.
2. Wait for the LX-300 circuits to fully power-on and stabilize.
• Wait 1/2 second. The Watchdog LED is red.
• Start a watchdog timer that will turn the LED red if the system stalls.
• If the Watchdog LED does not turn green, the LX-300 is completely non-functional and must be returned to
Meyer Sound for repairs.
3. Test the SDRAM memory.
• Green Watchdog LED: success.
• Red Watchdog LED: failure.
4. Initialize Hardware. Proceed to B. Hardware Initialization (p. 8), below.
POST Failure
In the event of a POST error, rebooting the LX-300 may resolve the issue. Repeated failure indicates the LX-DSP
processor module is non-functional. Replace the LX-DSP with a known-good module. Return the non-working
module to Meyer Sound for repairs.
Multiple LX-DSP failures indicate a problem with the LX-300 itself. Replace the LX-300 with a known-good LX-300.
You may re-use the modules from the non-working LX-300, but they should be treated as suspect until proved good
(they may have been damaged by the non-working LX-300.) Return the non-working LX-300 to Meyer Sound for
repairs.
Multiple LX-300 failures indicate a problem with the facility power system. This is a situation beyond the scope of
this manual. Facility power problems may result in non-warrantable damage to your LX-300s.
B. Hardware Initialization
1. Prepare boot monitoring: set Watchdog LED to green.
When possible, the LX-300 will display an error code when the boot process fails. It does this by blinking the
Watchdog LED and by using the Frame Status display.
Most errors will display an two-digit error code in the Frame Status ("IE" plus two numbers).
There are several errors that make it impossible to use the Frame Status display. For these errors, the Watchdog
LED will repeatedly blink the error code, with a pause between each cycle. The number of green-red blinks corresponds
to the error code.
Consult the LX-300 Error Codes (p. 43) section of this manual for trouble-shooting advice for known failure modes.
The cause of a failure that stalls the system, such that errors can not be displayed, can not be directly determined.
In such cases, contact Meyer Sound LCS Series™ customer support for assistance.
2. Perform various vital hardware initializations.
• Green Watchdog LED: initialization is proceeding successfully.
• Red Watchdog LED: system initialization has stalled.
• Blinking Red-Green LED: initialization has failed. See LX-300 Error Codes (p. 43).
There are two possible failures that do not stop the system at this point. The error messages will be scrolled across
the Frame Status. They refer to "DMA0" and "DMA1". See LX-300 Error Codes (p. 43) for details.
3. Enable front panel display.
8
A. Power-On Self Test