7.2.1 Beginning Setup
1. Make sure all boards are connected.
2. Verify Ax, SOLO, and SPR are all "OFF".
3. Verify RELAY (Bypass) is "OFF".
4. Set NR THRESHOLD to -60.
7.2.2 Tune Check
1. Set input signal to audio sweep.
2. Set SOLO to "ON".
3. Set PEAKING to 12 o ’clock.
4. Set NULL FILL to minimum.
5. Place a spectrum analyzer on output.
6. Verify-3dB point tunes from 700Hzto 7KHz (approx).
7.2.3 Peaking Check
1. Set input and output to equal those in section 7.2.2.
2. Set TUNE Control to 12 o ’clock position.
3. Set NULL FILL to minimum.
4. Verify nominal peaking characteristics (Max peak = +6dB).
7.2.4 Null Fill Check
1. Set input and output to equal those in section 7.2.2.
2. Set SOLO to "OFF".
3. Set Ax to "ON".
4. Set MIX to maximum position.
5. Set PEAKING to 12 o ’clock position.
6. Verify NULL FILL the null at maximum setting.
7.2.5 Shift Null
1. Inject a +2V to -2V ramp at TP402.
2. Observe the shift at TP403.
3. Adjust VR408 and VR409 for minimum shift.
Test and Nulling Procedure 7 -3
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