6. Readjust the line input level control to measure
4.9V AC output at the audio analyzer.
7. Insert a 1KHz common mode signal into the EXT LINE
IN connector.
8. Adjust RV204 (internal) for a minimum common mode
signal.
9. Insert a +8 dBu (1 KHz) signal into the EXT LINE IN
connector and record the output reading.
10 Remove the signal from the EXT LINE IN connector,
and insert it into the audio input “+” and “-” pins of
the FRAME connector, P10.
11. Remove the shorting plug from jumper block J201.
The output reading should be the same as in step 9.
2.2.3.3 Speaker Muting Set-up
1. Short pins 2 and 3 of jumper block J202.
2. Insert a +8 dBu signal (1 KHz) into the audio input pins
of the FRAME connector, P10.
3. Alternately activate and deactivate a front panel
Talk
key while adjusting the SPKR MUTE trimpot
(RV203) to provide 15 dB muting at the + AMP
OUT and - AMP OUT terminals during
Talk
switch
activation.
4. Short pins 1 and 2 of J202. Insert a +8 dBu signal (1
KHz) into the audio input of the FRAME connector.
5. Activate a front panel
Talk
key, and check that the
amplifier output is fully muted. Restore the J202
shorting plug to pins 2-3.
6. Remove the 8-ohm load from the amplifier output, and
reconnect the speaker.
2.2.3.4 Headphone Level Adjust
1. Terminate the headphone output of the HEADSET
connector (pins 5 and 9) with an 8-ohm, 10-watt
resistive load. Connect an audio analyzer across the
load.
2. Set the front panel HDST switch to on.
3. Insert a +8 dBu signal (1 KHz) into the audio input of
the FRAME connector.
4. Adjust the HDST trimpot (RV208) for 2V RMS (500
milliwatts) at the headphone output.
5. Set the front panel HDST switch to off.
6. Adjust the HDST MUTE trimpot (RV206) for 6 dB
muting below the 2V AC reference level.
2.2.3.5 Sidetone Level Adjust
1. Install a shorting plug across pins 1-2 of J203.
2. Insert a -70 dBm signal (1KHz at 150 ohms) into the
dynamic mic input of the HEADSET connector .
3. Turn on the HDST switch, and monitor the signal level
across the 8-ohm load at the headphone output of the
HEADSET connector.
4. Adjust the SIDETONE trimpot (RV209) to 35 dB
below a 2V AC reference level. (The level may be
varied according to user preference.)
5. Remove the test equipment.
KP95/96/97 Keypanel Installation
2-5
(58 paginas)
(22 paginas)
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