Ericsson LBI-39055 manual Firmware, Installation Into The PC, Audio PA Boards, Audio Tower

LBI-39055

Firmware

EPROM integrated circuit U4 on the Logic Board stores the operating program firmware for the on-board microprocessor. After programming at the factory, the EPROM (part number 344A4245Gx) is labeled with the corresponding firmware version number. C3 Maestro application software version 3.0x requires Logic Board firmware version 3.02 (part number 344A4245G10) or later. If necessary, verify the proper EPROM is installed into U4's socket.

Installation Into The PC

The Logic Board is installed in an expansion slot inside the PC. Although it can be installed in any slot, installing it in the slot furthest from the PC's internal power supply is recommended. If field installation is necessary, follow this procedure:

1.	Review the	procedures in	the documentation
	included with the PC related to expansion board
	installation.
2.	If necessary, power-down the PC and
	disconnect it from the ac power source.
3.	Remove the	outside cover	from the PC in
	accordance with the manufacturer's instructions.

Audio PA Board(s)

SW1 − Maximum Speaker Power Level DIP Switch

Switch SW1 on the Audio PA Board provides a method to limit the maximum audio output from each speaker power amplifier. Maximum levels of 5 watts or 8 watts are available. Normally, the factory setting is 5-watts. This level is recommended, as it should be adequate in nearly all dispatch environments. Table 2 indicates the available settings and Figure 4 shows the 5-watt factory setting. These switches have no effect on headset earphone output levels.

NOTE

SW1 is not present on Audio PA Board P29/5000055000. Both speaker power amplifiers on this earlier board (sometimes referred to as a "Phase 1" board) are hardwired for 8 watts maximum output. See LBI-38716 for details.

TABLE 2 − AUDIO PA BOARD

MAX. SPEAKER POWER LEVEL SELECTION

4.	Select an empty expansion slot and remove the
	respective rear cover plate. Retain the hold-down
	screw. Discard the rear cover plate.
5.	Install the Logic Board in the selected expansion
	slot. Secure it with the hold-down screw.
6.	Replace the outside cover.

PLUG-IN RS-422 BOARD (Optional)

If the PC is equipped with a plug-in RS-422 capable board, see the section entitled "INTERCONNECTING

THE EQUIPMENT", subsection "CEC/IMC INTERCONNECTIONS" for set-up information.

AUDIO TOWER

			SW1
	POSITION
1		2		3
OFF			OFF		x
ON			OFF		x
OFF			ON		x
ON			ON		x

"x" = either position

4

x

x

x

x

MAXIMUM

OUTPUT

SPKR A	SPKR B
5 Watts	5 Watts
8 Watts	5 Watts
5 Watts	8 Watts
8 Watts	8 Watts

All necessary slide-in boards are installed in the Audio Tower before the C3 Maestro console system ships from the factory. If the console system is ordered with multiple unselect speakers (2 or 3) or with the Call Director patch option, two Audio PA Boards are installed. DIP switches and jumpers/plugs located on the Audio Matrix and Audio PA Boards are factory configured for standard console installations. The following information lists the normal factory settings and the optional settings which are available.

Figure 4 − Audio PA Board SW1 Factory Setting

SW2 − Audio Source DIP Switch

During normal console operations, SW2 positions 1 and 3 should always be "ON" or "CLOSED" and SW2 positions 2 and 4 should always be "OFF" or "OPEN". Figure 5 shows this setting.

For test procedures, SW2 positions 1 thru 4 may be inverted to shift the Speaker A and Speaker B audio

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