Manley Langevin Dual Vocal Combo 4/2001 - present LDVCP179 and up - Manual (Page 15)

INTERNAL ADJUSTMENTS
1) +45 Volt DC adjust with meter from ground to resistor marked by arrow. Check this first and adjust if
needed. It is the power supply regulator adjustment. Now for the audio ....
You will have to start out by setting front panel controls to these settings: BYPASS mode, SEP /
LINK OFF, REDUCTION controls counter clockwise (MIN), GAIN to 1:00 or unity, Balance
at 12:00. The top will need to be open. There are two screws on the top that hold the top perforated
panel in place. Remove these and the top will slide back. Be careful! THERE ARE HIGH
VOLTAGES
INSIDE THE LIMITER. DO NOT HOLD THE METAL PART OF THE SCREWDRIVER. DO NOT
PROBE PROBE AROUND WITH THE SCREWDRIVER OR FINGERS. The unit should be on for
about 15 minutes to allow for "warming up".
2 & 3) This adjusts thelimiter amplifier gain in all modes. 1 KHz sine at 1.23 volts RMS (+4 dBm, 0 VU) to
both inputs. BYPASS mode. Adjust 2 & 3 for unity gain at outputs.
4 & 5) This adjusts VU meter calibration for OUTPUT. Same input, Meter switches to OUTPUT. Adjust for
0 VU on the Meters.
6 & 7) This adjusts the meter zero for Reduction mode. Meter switches to REDUCTION. Adjust for 0 VU on
the Meters.
8 & 9) This adjusts the meter in Reduction mode to reflect the actual gain reduction accurately. You will
probably need to increase the oscillator 10 dB to get Limiting. Switch from BYPASS to IN. Meter
switches to OUTPUT. Adjust GAIN controls to get 0
VU on the METERS again, then adjust
REDUCTION controls to reduce the signal to -4dB. Switch METERS to REDUCTION. Adjust 8 &
9 to get -4 dB on the METERS.
10) This adjusts the gain of the right side chain and adjusts the side chain balance in Link. Switch the
LINK ON. There should be 1 to 2 dB change in the Meters. Adjust 10 so that the meter is
the
same for both sides. You may have to re-adjust 8 and 9. Check that both in LINK and
SEPARATE that both channels show the same reduction.
11) Sets the gain for each channel's Mic Pre. Use a low level input in the mic XLRs and adjust each
channel for 45 dB of gain with the Input Attenuator wide open fully CW.
12) Sets the Direct (Instrument) Input gain. Use a low level input in the 1/4" front panel jacks and adjust
each channel for 25 dB of gain with the Input Attenuator wide open fully CW.
15
(see layout on page 16)