Telex MCE325 User Manual download pdf (Page 42)

4-4 CSI-200 User Instructions

2 Set the MIC ON button to on. Set all other front panel buttons to off.

3 Check for 13 VDC minimum at the key 1 output.

4 Turn CH 1 TALK on and check for less than 2 VDC at the key 1 output.

5 Repeat steps 3 and 4 for the other channels:

CH2 TALK: key 2 out (J22 pin 19)

CH3 TALK: key 3 out (J22 pin 7)

CH4 TALK: key 4 out (J22 pin 20)

6 Remove the 47 kohm pull-up resistors when finished.

USMB (Un-Switched Microphone Balanced) Frequency Response

and Level Check

1 Set all front panel buttons to off.

2 Connect a signal generator to the DYN MIC HEADSET jack mic input (J2 pins 1 & 2).

3 Connect a 600 ohm resistor across the USMB output (J22, pins 1 and 14).

4 Connect an AC voltmeter across the 600 ohm resistor.

5 Verify the output levels for the input frequencies and levels in Table 4.2.

6 Remove the 600 ohm resistor across the USMB output.

Frequency Response and Level Check, Mic to Line

Four-Channel, Two-Wire Mode

1 Activate the MIC ON button. (All other front panel buttons should be off.)

2 Connect an AC voltmeter across the channel 1 output. The signal generator should still be

connected to the dynamic mic input.

3 Activate the CH 1 TALK button.

4 Verify the output levels for the input frequencies and levels in Table 4.3.

5 Repeat for channels 2 through 4 by connecting the AC voltmeter across the appropriate output,

activating the appropriate TALK button, and measuring the output level:

Table 4.1

Talk button vs. output.

TALK BUTTON OUTPUT

CH 2 J8, pins 1 and 3

CH 3 J10, pins 1 and 2

CH 4 J10, pins 1 and 3

Table 4.2

USMB frequency response and level check.

INPUT

FREQUENCY INPUT LEVEL OUTPUT LEVEL

1 kHz -55 dBu (1.4 mV)

–45 dBu (4.35 mV)

–25 dBu (43.5 mV)

-1 ±3 dBu (0.49 – 0.98 VAC)

2.5 ±2 dBu (0.83 – 1.32 VAC)

2 ±2 dBu (0.75 – 1.2 VAC)

100 Hz -55 dBu (1.4 mV)

–45 dBu (4.35 mV)

–25 dBu (43.5 mV)

-0.5 ±3 dBu (0.51 – 1.03 VAC)

4.2 ±2 dBu (0.98 – 1.55 VAC)

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 84 85

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Telex MCE325 User Manual Page 42

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