Q2 Audio Compex F760X-RS User Manual - page 10
8. If output attenuator(s) are fully CW (open), the output should be +12dBu. If it is not, adjust 1K potentiometer (VR6) near
the edge of the front PCB to give +12dBu output. If the meter no longer reads 4dB of GR, go back to step 7 and repeat.
9. Check distortion at this stage; a measurement of about 0.2% or better should be obtained with a release time setting of
0.4S.
10. Peak limit threshold is now checked by switching that section “in” and switching the threshold to “0”. The peak limit
light should come on and the gain reduction indicated on the meter drops to 2dB. The output level of the unit will rise to
+14dBu approx. (Adjust the peak limit threshold pre-set to give +14dBu Output).
11. EXPANDER SECTION: Adjust front panel “Range” pot CCW (“20”); attack switch to “F” and Threshold CCW (“H”).
12. Select “EXPAND” mode and meter should read 20dB gain reduction with the green indicator lighting.
13. If it does not read 20dB, temporarily adjust the “range” pre-set on the “C” board unit a reading of 16dB is achieved then
proceed to the next step to adjust for stereo linking.
Check that both channels are reading 16dB, then select the “stereo in” mode on the stereo link switch and ob
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serve and change of position in meter readings. If movement occurs, switch out the stereo link and adjust the one moving
towards “0” with the “FET LAW” preset on the “C” board so that it moves forward by 2X as much as the backward error
(over correct by 100%). Now bring back to 16dB with the “RANGE” pre-set. Check the stereo match (meters should not
move when ‘stereo’ is selected) again by switching IN the stereo link, repeat as necessary. Once the channels are ste
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reo matched, adjust both channels “Range” trimmers to indicate 20dB with the range control set to maximum.
14. Threshold adjustment: Expander front panel threshold pot fully CW (“LO”); select EXPAND mode; RANGE control at
maximum (CCW); attach switch to “F” and release to fastest position.
15. Input a 1Khz signal @ -40dBu; adjust the “THRESHOLD” pre-set on the “C” board so that the expander is just open
(meter reading “0”) and green indicator lamp is flickering.