4. Check the level at the MIC PRE OUT connector (ref
Table 6 for pin-out). It should measure +8 dBu.
5. If the reading is not +8 dBu, but within a 3dB range,
adjust the LEVEL TO MATRIX trimmer (RV406)
for +8dBu.
6. If the reading is more than 3 dB from +8 dBu, or
another output level is used by your facility, proceed
to paragraph to begin the mic preamp calibration
procedures.
7. Check the frequency response from 200 Hz to 15
KHz. It should be within 1 dB.
8. Check the input noise. It should be at least -70 dB
below +8 dBu.
9. Check the Total Harmonic Distortion (THD) from
200 Hz to 15KHz at +18 dBu output. It should be less
than or equal to 0.15 percent.
Balance Adjustment
1. Turn the COMPR trimmer (RV405) fully
counterclockwise. This sets the compressor circuit to
minimum (compressor ratio of 1:1).
2. Measure and record the dc voltage at test point
TP407.
3. Install a shorting plug across J402.
4. Measure the dc voltage at TP407, and adjust RV408
(internal) to match (within 5 mV) the previously
recorded voltage.
5. Remove the shorting plug at J402.
Tone Generator Level Adjustment
1. Activate the 400 Hz tone generator in the keypanel
(enter 0-8-7 on the keypad).
2. Adjust the LEVEL TO MATRIX trimmer (RV406)
for a +8dBu tone output level at the MIC PRE OUT
connector.
3. Turn off the tone generator (press CLR on the
keypad).
Panel Mic Level Adjustment
1. Configure the J404-J406 jumper blocks for a
balanced dynamic panel microphone: J404 short pins
2-3; J405 short pins 1-2; J406 short pins 1-2. (This is
the default microphone configuration.)
2. Insert a -70dBm signal (1 KHz at 150 ohms) into the
gooseneck microphone connector. Or use the EXT
MIC IN connector (with the front panel microphone
removed).
3. Adjust the PNL trimmer (RV401) for +8dBu at the
MIC PRE OUT connector.
4. Insert a common mode signal (120 Hz, -70 dBm) into
the gooseneck microphone connector, or into the
EXT MIC IN connector.
5. Adjust RV402 (internal) for a minimum common
mode signal at the MIC PRE OUT connector.
6. Reinsert a -70dBm signal.
7. Remove the shorting plug across J401 (causes
continuous mic activation).
8. Monitor the level at the audio output pins of the
FRAME connector, P10 (reference Table - for
pin-out). The output level should be +8dBu.
9. Remove the signal from the mic input, and reinstall
the shorting plug across J401.
Headset Dynamic-Mic Level
1. Insert a -60dBm signal (1 KHz at 150 ohms) into the
dynamic mic input of the HEADSET connector
(reference Table
4, page 11 for pin-out).
2. Activate the HDST key on the front of the keypanel.
3. Monitor the signal level at the MIC PRE OUT
connector. It should be +8 dBu. If not, adjust the
DYN HDST trimmer (RV403) to achieve an output
reading of +8 dBu.
4. Insert a common mode signal into the dynamic mic
input of the HEADSET connector.
5. Adjust RV404 (internal) for a minimum common
mode signal at the MIC PRE OUT connector.
6. Remove the signal at the dynamic mic input.
Installation Instructions, KP95-0 Keypanel 15
(31 páginas)
(22 páginas)
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