LYDKRAFT ApS
Mose Allé 20, DK 2610 Rødovre
Denmark
6
ADJUSTMENT PROCEDURE:
CAUTION:
Before making any adjustment let the unit heat-up at least 15 min.
Observe that the offset-voltage measured at the side chain jack socket, when the
THRESHOLD is off, is not greater than +/- 15 mV DC in both position "fixed" and "manual".
(tip is bus 1 and ring is bus 2).
If the voltage exceeds this value, replace either IC1 or IC2.
For serial no. up to 15891
THE GRE SHALL BE MARKED BETWEEN 1.225-1.285
For serial no. 15892 and onwards
THE GRE SHALL BE MARKED BETWEEN W1.20- W1.50
ADJUSTMENT OF BASIC GAIN:
1)
Apply a signal of 1 kHz, -30,0 dBU into the input of the compressor.
2)
Turn the
GAIN-
control fully clockwise.
3)
Set the
RATIO-
control at 2:1
4)
Adjust the pre-set
GAIN
(located on amp/psu PCB) to an output-reading of 0,0 dBU.
ADJUSTMENT OF COMPRESSION TRACKING
:
1)
Turn the
THRESHOLD
-control fully counter-clockwise.
2)
Set the
RATIO-
control at 2:1.
3)
Set the
BUS-select
-switch at 1.
4)
Apply a signal of 1 kHz, 0,0 dBU into the input of the compressor.
5)
Adjust the
GAIN
-control to an output-reading of 0,0 dBU.
6)
Apply a DC-voltage of +250,0 mV into the side chain jack socket (tip) and observe that the
output level has dropped to -10,0 dB.
7)
If this is not the case, adjust the level with P 2 (P 1)*, to obtain a drop of exactly -10,0 dB.
*
The trimpots in parenthesis refers to PCB 870316-0,1,2
(180515)
