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DSP/Amplifier PCB LED's

There are 2 LED's in the system, located on the DSP/Amplifier board, a green LED (DS6500

[sheet 3, D7]) and an amber LED (DS6501). The amber LED is not populated in production.

When the main board is installed and rear cover is in place, the light produced is visible (with

practice) through the rear grille as it reflects off the heat sink as well as goes through drilled

holes in the PC board. R6500 and R6501 limit the current through the LED's (as well as the

DSP controlling them). The table below explains the uses of these LED's in production mode

(CB = Counter Blink: when one LED is on, the other LED is off!):

Green

Amber

LED

Off

CB, 5 Hz

Once

Off

every 5

sec

1 Hz

Off

CB, 1 Hz

Toggle

Don't

care

CB, 5 Hz

1 Hz

5 Hz

10 Hz

OFF

THEORY OF OPERATION

This should never happen. If it does, it likely means

1) That there is no power –OR-

2) There is a problem with the hardware (or, perhaps, software!)

When power is first supplied, BEFORE the DSP boots, the hardware

will put the LED's into this state. If the board stays in this state

there is a problem with the DSP hardware (or software).

Immediately after powering up AND if the LED's remain in this mode,

there is a problem with the Power On Self Test (POST): either the

FLASH did not checksum or the SDRAM memory test failed or

there was a problem initializing one or more or the audio peripherals

(U4000, U4400).

Board is powered, initialized, and waiting for a Smart Speaker

command to turn on the board. The LED will be on for only 0.010

seconds!

Board is powered, initialized, has been turned on by the console (or in

ASCII TAP mode) and S/PDIF is present. When on, the LED will be

on for 0.5 seconds.

Board is powered, initialized, has been turned on by the console (or in

ASCII TAP mode), S/PDIF NOT present. When on the LED will be

on for 0.5 seconds.

The green LED will toggle whenever a byte is received from the

RS-232 input. This toggling will modulate the current state of the

green LED, i.e. the normal 1 Hz rate may be "chopped" by incoming

RS-232 data.

If the board passed the POST and generally seemed to be OK, this

state indicates that a catastrophic software error has occurred. The

production code will stay in this mode for 1 second then do a

software reset; development code will remain in this state, allowing

the developer to isolate the source of the problem.

When the system is operating normally, the orange LED may remain

on when the amplifier mute is on.

LED's will blink together when reading FLASH update data.

LED's will blink together when FLASH is being written with update

information

The green LED will blink when in the quasi-standby state

Description