STUDER REVOX C279 Serviceanleitung Seite 105

sTUDtrR
REVOX
c279 E
413
4.3
DISPLAY
UNIT 1.775.310
4.3.1
Atigning the output
meter
r Brjng
the
mixing conso[e
to
the
normat
openating posi-
tion.
I
I
Move
the
oUTPUT LEVEL
t'l3l
sLide
suitch
on
the rean
of
the mixing
consoLe
to 0
dBu
position.
connect
the audio vottmeter
to
MASTER
UNBAL. LEFT
t16l
(Range 1
V).
Turn the
INPUT SELECT0R
t1,al to
STEREo
position
and
GAIN
t1,bl
Levet
potentiometer
to the center position.
SHitch
on the mixing
consote.
tJith the
AF
genenator {eed
a 1
kHz
sine Ltave
signaL,
approx. 700
mV,
to
INPUT
I f24J,
STEREO
LEFT
(y).
Move
the input
faden
[1,h) to "0" positjon, and
väry
the
genenator output
voLtage
so
that the AF
voLtmeter
gives a
reading
of
732
mV.
tlith the
trimmer
potentiometer
RA
3 (accessibte
from
the
fr
ont) drive the
LeJt-hand
strip o{ the
PEAK
PRO-
GRAM METER
to the point
Hhere
the
0
dB
-LED
Lights
up.
ALign
the right-hand strip oJ the
PEAK PRoGRAM
METER
in
the
same
mannet:
Connect
the
AF
generaton and
the
audio voLtmeter
to
the
right-händ
channeL and
drive the 0
dB
LED
wjth
trimmer
potentiometer
RA 2.
0dB
RA3
RA2
FFt
RA4
RA3
1.4
INPUT
UNIT 1.775.330
The sjx input units are to be adjusted
individuatLy
acconding
to the
foLLor,Jing
instructions.
The
FADERS
of the five input units not invoLved in
the
measunement
must be bnought
to -o position.
t+.t+.1 ALigning the
harmonic
distortion
r
Turn
the
iNPUT
SELECToR
tal to
STEREo
positjon.
I
Connect
the digital
voLtmeter
to
oUTPUT PRE FADER
Iaa]
output
(range
500
mV AC).
r
connect
the
distortion
meter
to
oUTPUT AFTER FADER
tzl.
r
Fnom
the
AF
generator
{eed a 1
kHz 500
mV
sine
uave
sjgnaL
to the
unbaLanced
input
STEREo
L (Left).
. tlith the input
Levet
potentiometer
GAIN
tbl adjust
the
gain in
such
a
Hay
that the djgitaL voltmeter gives
a
neading
of
255
mV.
r
Move
the
INPUT
FADER
thl to 0
dB
position.
r tlith the
trjmmer potentiometer
RA
4
aLign
the
Lett-händ
channet
{or
minimaL
distortion.
r
Feed
the
same
signal
{nom
the
AF
generator to the
input
STEREo
R
(right)
and
aLign
the right-hand channet for
minimat
distor"tion rith the
tnimmen
potentiometen
RA
3.