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Studer 928 Service Manual

Studer 928
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928 Mixing Console
Alignment E 3/21Edition: 07.02.01
3.3.4 Master units A/B 1.928.320/1.928.321
Note: If the calibration must be done from a stereo input module,
and the PAN potentiometer is off, all measured levels are low-
er by 3 dB.
Fader calibration:
Feed test signal with nominal level (1 kHz, typ. +6 or +10 dBu)
to the LINE input of a mono channel.
Route the signal to Master A (ΣA) or B (ΣB).
Set the LINE GAIN and the PAN potentiometers to their center
positions (CAL.), switch filters off, set the input and master fad-
ers to their 0 dB positions.
Remove the Master unit from the console and reconnect it via
the bus adapter (optionally available; order no. 1.228.332.00).
Connect the unbalanced input of the AF voltmeter to J3/pin1,
and ground to the unit's ground cable.
Adjust level with trimmer potentiometer PR5 to 9 dB below
nominal level (3 dB below nominal level due to the PAN po-
tentiometer in center position, and an additional 6 dB because
of unbalanced measurement setup).
This adjustment is valid for both channels.
Distortion:
Connect the distortion analyzer to the corresponding MASTER
OUTPUT LEFT.
Adjust with trimmer potentiometer PR6 to minimum distortion.
Connect the distortion analyzer to the corresponding MASTER
OUTPUT RIGHT.
Adjust with trimmer potentiometer PR4 to minimum distortion.
Master output level:
Connect the AF voltmeter to the corresponding MASTER OUT-
PUT LEFT.
Adjust the measured level with trimmer potentiometer PR3 to
3 dB below nominal level.
Connect the AF voltmeter to the corresponding MASTER OUT-
PUT RIGHT.
Adjust the measured level with trimmer potentiometer PR2 to
3 dB below nominal level.
Limiter:
Connect the AF voltmeter to the corresponding MASTER OUT-
PUT LEFT.
Activate the limiter by pressing the LIMITER IN key.
Increase the input level with GAIN potentiometer by 10.2 dB
(nominal level +10.2 dB).
Set the THRESHOLD potentiometer to its center (“CAL”) posi-
tion.
Adjust the output level with trimmer potentiometer PR1 to
nominal level +0.2 dB.
OUTPUT
LEVEL R
OUTPUT
LEVEL L
PR3
PR2
J1
J2 J3 J4 J5
J6
PR6
PR4 PR5
NULL
L
NULL
R
FADER
CAL
LIM LEVEL
PR1
Main Board
1.928.320/321
(component side)

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Studer 928 Specifications

General IconGeneral
BrandStuder
Model928
CategoryMusic Mixer
LanguageEnglish

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