Chassis Diagnostic Test Mode (Amp Info – Diagnostics); Bootloader Mode; Front Panel Lockout - Crown XTi series Service Manual

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Chassis Diagnostic Test Mode (Amp Info – Diagnostics):
NOTE: This mode is available to all users.
Entered by pressing all three front panel buttons for > 3 seconds.
Exit by successfully pressing SEL at any time.
IMPORTANT!!!!: When you are in the "AMP INFO" screens, the firmware is NOT running
thru all of the normal routines. Clip check is called, but not as fast as normally, you will
see more clipping. The thermal limiter and fan should work just fine. The heartbeat LED
and front panel LEDs will not update. The clip limiter and governor are also not running.
Operation
Display the present Power Supply measured temperature in degrees C
Display the present Ch1 measured temperature in degrees C
Display the present Ch2 measured temperature in degrees C
Display the present Firmware rev level (read from serial flash)

Bootloader Mode:

Entered by pulling TP17 low during power up.
Exit by cycling the power.
Operation
Used to download new firmware to the LPC2142. It copies an internal boot-loader
from flash to RAM, where it executes. It erases the on-chip flash, and reprograms
it. See the Programming document for more details. It is impossible to corrupt this
boot-loader. It resides at a special location in internal Flash that is not accessible to
anything. This should ALWAYS work!

Front Panel Lockout:

Entered by holding UP and DOWN buttons down simultaneously.
Exit by holding UP and DOWN buttons down simultaneously.
Operation
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After holding down the up and down
buttons for about 3 seconds, the LCD
will display "LOCKED", this indicates the
amp is now in lockout mode. If any
button is pressed, no action will be
taken, except to display the "LOCKED"
Special Note: The front panel lockout message. IF you continue to hold the
buttons down they will simply toggle the mode can also be entered from the
lockout mode on and off. software. In this case, the software will
supersede the front panel. So, holding
down the up and down buttons will NOT
disable front panel lockout mode. When
enabled from software, it can ONLY be
disabled from software. This operation
is consistent with the ITech.