Telex MCE325 Benutzerhandbuch
4-8
C S I - 2 0 0 U s e r I n s t r u c t i o n s
11
Restore jumper J16 to short pins 1 & 2.
Program B to Right Headphone
1
Remove the signal from the PROGRAM A input, and connect it to the PROGRAM B input.
2
Measure the level at the right headphone output (J2, 3 & 5). It should be 1.3 dBu ±2 dBu.
(Program volume at maximum.)
(Program volume at maximum.)
3
Set the signal generator to 0 dBu, 100 Hz. The right headphone output should be 0.8 dBu ±2
dBu.
dBu.
4
Set the signal generator to 0 dBu, 10 kHz. The right headphone output should be –3.8 dBu ±2
dBu.
dBu.
5
Reset the generator to 0 dBu, 1 kHz.
6
Remove jumper J17 (program not assigned to right headphone). Verify that the signal level
drops at least 35 dB from the reference level in step 2.
drops at least 35 dB from the reference level in step 2.
7
Restore jumper J17 to short pins 1 & 2.
Program to Speaker
1
Connect the AC voltmeter across the 8 ohm load at the speaker output
2
Set the SPKR ON button to the on position.
3
Measure the level at he speaker output. It should be 6 dBu ±2 dBu. (Program volume at
maximum.)
maximum.)
4
Set the signal generator to 0 dBu, 100 Hz. The speaker output should be 1.3 dBu ±2 dBu.
5
Set the signal generator to 0 dBu, 10 kHz. The speaker output should be 7.3 dBu ±2 dBu.
6
Reset the generator to 0 dBu, 1 kHz.
7
Remove jumper J18 (program not assigned to speaker). Verify that the signal level drops at
least 35 dB from the reference level in step 3.
least 35 dB from the reference level in step 3.
8
Restore jumper J18 to short pins 1 & 2.
IFB Test
IFB B
1
Set all front panel buttons to off. Set all volume controls to minimum.
2
Move the J5 jumper to short pins 1 and 2 (IFB B assigned to channel 4).
3
Check the output level across intercom channel 4. It should be –9.8 dBu ±2 dBu.
4
Turn on the CH 4 TALK and MIC ON buttons. The channel 4 output should drop at least 45
dB from the reference level in step 3.
dB from the reference level in step 3.
5
Turn off the CH 4 TALK and MIC ON buttons.
6
Ground the Key 4 input (short J22 pin 20 to pin 10). The channel 4 output should drop at least
45 dB from the reference level in step 3.
45 dB from the reference level in step 3.
7
Remove the Key 4 ground.
8
Move the J5 jumper to short pins 2 and 3.