Dynacord DPM 4000 manual Closed

DEVICE DESCRIPTIONS

Block Diagram:

							ELECTRONIC
							PROGRAMMABLE			+U24
							FUSE
										+12V	ANALOG
										-12V	SUPPLY
		DPC 4000								+5V	DIGITAL
		IN A									SUPPLY
		24V
	RS-485									RX485
	AUDIO									TX485
						NRS 90208				INTERNAL MONITOR
							MON A			PILOT
							A			MCLK
						PILOT A				BCLK	2 CHANNEL
											DIGITAL
										WCLK
							D				AUDIO
										DIN
			+24V				MON B
		JP1	1	3					4	SPI
			2	4		PILOT B			BOARD
									CONTROL
MIC/
					MIC
LINE						GAIN
					LINE
IN B	1	2
		3								RES
						NRS 90233	LIN
							JP2
							COMP		BOARD
									STATUS
							LINE JP1		& ID
							MIC 5	6
						COMPRESSOR /
						LIMITER
		figure 5.25				block diagram MIC/LINE + paging station module

Internal Settings:

1.MIC / LINE switching and sensitivity of the MIC / LINE input

The MIC / LINE input's internal PAD-switch (S1) allows switching the channels' sensitivity between microphone and line levels (30 dB). The GAIN-control on the module's front panel is provided to precisely adjust the input sensitivity (range 40 dB).

In addition, a MIC/LINE jumper (JP1, pins 5-6) is located on the printed board assembly, which allows correctly configuring the input. It is important to change the jumper accordingly (open = LINE, closed = MIC) when changing the MIC/LINE switch.

When shipped the switch S1 is pre-set to LINE and the jumper JP1 to its open position.

GAIN setting	MIC / LINE setting	MIC / LINE jumper	Input level
Left margin	MIC	Closed	-14 dBu
	LINE	Open	+16 dBu
Center position	MIC	Closed	-28 dBu
	LINE	Open	+2 dBu
Right margin	MIC	Closed	-54 dBu
	LINE	Open	-24 dBu

2.Phantom power

Closing the pins 1-2 and 3-4 of the jumper JP1 offers the possibility to engage 24 V phantom power for microphones that are connected directly. When shipped, the jumper is factory pre-set to its “open” position (no phantom power).

3.Compressor / Limiter

The MIC / LINE input channel embodies a compressor / limiter circuit which can be incorporated into the signal path via jumper JP2 (position COMP). Normally, the compressor / limiter should be used to eliminate the risks of overdrive and clipping, when directly connecting a microphone. When shipped, the jumper is pre- set to its “Linear” position (LIN).

PROANNOUNCE System User Handbook 1.1 5-21