Studer 928 Operation And Service Manual
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Studer 928 Operation And Service Manual

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Studer 928
Mixing Console
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
General
List of all Plug-In Modules
Layout and Designations, Specifi cations
Block Diagram
Operation
Jumper Settings
Alignment
Plug-In Units of the Input Section (1.928...)
Inputs, Groups,
AUX Master Units
Talkback/Monitoring
Plug-In Units of the Meter Panel
Signaling
Metering
Generator
EU Standard PCBs
Connectors
Wiring Lists
Wiring Diagrams
Bus Boards
19" Rack-Mount Power Supply
Operating and Service Instructions

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Summary of Contents for Studer 928

  • Page 1 Mixing Console General List of all Plug-In Modules Layout and Designations, Specifi cations Block Diagram Operation Jumper Settings Alignment Plug-In Units of the Input Section (1.928…) Inputs, Groups, AUX Master Units Talkback/Monitoring Plug-In Units of the Meter Panel Signaling Metering Generator...
  • Page 2 Copyright by Studer Professional Audio GmbH Studer Professional Audio GmbH Printed in Switzerland Technical Documentation Order no. 10.27.4251 (Ed.0702) Althardstrasse 30 CH-8105 Regensdorf - Switzerland Subject to change Studer is a registered trade mark of Studer Professional Audio GmbH, Regensdorf...
  • Page 3 SAFETY / SECURITE / SICHERHEIT To reduce the risk of electric shock, do not remove covers (or back). No user-serviceable parts inside. Refer servicing to quali- fied service personnel. Afin de prévenir un choc électrique, ne pas enlever les couvercles (où...
  • Page 4 SAFETY / SECURITE / SICHERHEIT FIRST AID PREMIERS SECOURS ERSTE HILFE (in case of electric shock) (en cas d'électrocution) (bei Stromunfällen) 1. Separate the person as quickly 1. Si la personne est dans l'impos- 1. Bei einem Stromunfall die be- as possible from the electric sibilité...
  • Page 5 SICHERHEIT / SAFETY Installation Installation Vor der Installation des Gerätes müssen die hier aufge- Before you install the equipment, please read and adhe- führten und auch die weiter in dieser Anleitung mit re to the following recommendations and all sections of bezeichneten Hinweise gelesen und während der these instructions marked with Installation und des Betriebes beachtet werden.
  • Page 6 SICHERHEIT / SAFETY Zugentlastung für den Netzanschluss Mains connector strain relief Zum Verankern von Steckverbindungen ohne mechani- For anchoring connectors without a mechanical lock sche Verriegelung (z.B. IEC-Kaltgerätedosen) empfeh- (e.g. IEC mains connectors), we recommend the fol- len wir die folgende Anordnung: lowing arrangement: Procedure: The cable clamp shipped with your unit is Vorgehen: Der mitgelieferte Kabelhalter ist selbstkle-...
  • Page 7 Umgebungstemperatur Ambient temperature Geräte und Systeme von Studer sind allgemein für einen Um- Units and systems by Studer are generally designed for an am- gebungstemperaturbereich (d h. Temperatur der eintretenden bient temperature range (i.e. temperature of the incoming air) of Kühlluft) von +5...+40 °C ausgelegt.
  • Page 8 UMGEBUNGSBEDINGUNGEN / AMBIENT CONDITIONS Vor der Inbetriebnahme muss das System auf allfällige interne Before putting into operation, the system must be checked for Betauung oder Eisbildung überprüft werden. Nur bei sehr internal formation of condensation or ice. Only with a minute leichter Eisbildung kann mit direkter Verdunstung (Sublimati- formation of ice, direct evaporation (sublimation) may be ex- on) gerechnet werden;...
  • Page 9 WARTUNG / MAINTENANCE Wartung und Reparatur Maintenance and Repair Durch Entfernen von Gehäuseteilen, Abschirmungen The removal of housing parts, shields, etc. exposes etc. werden stromführende Teile freigelegt. Deshalb energized parts. For this reason the following precauti- müssen u.a. die folgenden Grundsätze beachtet werden: ons should be observed: Eingriffe in das Gerät dürfen nur von Fachpersonal Maintenance should only be performed by trained per-...
  • Page 10 WARTUNG / MAINTENANCE Elektrostatische Entladung (ESD) Electrostatic Discharge (ESD) bei Wartung und Reparatur during Maintenance and Repair ATTENTION: Observe precautions for handling devices sensitive to electrostatic discharge! ATTENTION: Respecter les précautions d’usage concernant la mani- pulation de composants sensibles à l’électricité statique! ACHTUNG: Vorsichtsmassnahmen bei Handhabung elektrostatisch entladungsgefährdeter Bauelemente beachten!
  • Page 11 Lötverbindungen in der Abbildung weiter unten. Bei Studer werden keine handelsüblichen SMD-Teile Studer does not keep any commercially available SMDs bewirtschaftet. Für Reparaturen sind die notwendigen in stock. For repair the corresponding devices should be Bauteile lokal zu beschaffen.
  • Page 12 EMV / EMC Störstrahlung und Störfestigkeit Electromagnetic Compatibility Das Gerät entspricht den Schutzanforderungen auf dem The equipment conforms to the protection requirements Gebiet elektromagnetischer Phänomene, wie u.a. in den relevant to electromagnetic phenomena that are listed in Richtlinien 89/336/EWG und FCC, Part 15, aufgeführt: the guidelines 89/336/EC and FCC, part 15.

  • Page 13: Ce Declaration Of Conformity

    CH-8105 Regensdorf, erklärt in eigener Verantwortung, dass das Produkt declares under his sole responsibility that the product Studer 928, Mischpult, Studer 928, Mixing Console, (ab Serie-Nr. 1001), (on from serial No. 1001), auf das sich diese Erklärung bezieht, entsprechend den to which this declaration relates, according to following Bestimmungen der EU-Richtlinien und Ergänzungen...

  • Page 14: Table Of Contents

    928 Mixing Console CONTENTS 1 General ................E1/1 Utilization for the purpose intended ......E1/2 First steps ..............E1/2 1.2.1 Unpacking and inspection ........E1/2 1.2.2 Installation ............... E1/2 1.2.3 Adjustments, repair ..........E1/4 1.2.4 Accessories, options ..........E1/4 Specifications ............... E1/5 Contents E 1 Edition: 07.02.01...
  • Page 15 928 Mixing Console E 1 Contents Edition: 07.02.01...

  • Page 16: General

    928 Mixing Console GENERAL The Studer 928 console features a modular 30 mm concept with me- chanical frames for 12 or 16 units. This way, different size consoles can be built; the maximum would be 96 input units. Both mono and stereo input units are available.

  • Page 17: Utilization For The Purpose Intended

    928 Mixing Console Utilization for the purpose intended The Studer 928 mixing console is intended for professional use. It is presumed that the unit is operated only by trained personnel. Serv- icing is reserved to skilled technicians. The electrical connections may be connected only to the voltages and signals designated in this manual.
  • Page 18 928 Mixing Console Air flow Supply unit, version 1.918.213.00 Air flow Power connection: The attached female IEC 320/C13 mains cable socket has to be con- nected to an appropriate mains cable by a trained technician, respect- ing your local regulations. Refer to the “Installation, Operation, and Waste Disposal”...

  • Page 19: Adjustments, Repair

    The primary fuse is located inside the power supply unit and cannot be changed. In case of failure, the complete supply unit must be re- placed. Please ask your nearest Studer representative. 1.2.4 Accessories, options Accessories shipped with the 928 console: (Set: order No.

  • Page 20: Specifications

    928 Mixing Console Specifications General Voltage specification dBu: 0 dBu 0.775 V Channel input faders and master faders are set to 0 dB mark. Line outputs are terminated with 600 Ω. External sources have a source impedance of < 200 Ω.
  • Page 21 >100 dB Fader attenuation, output >90 dB Power supply 100...240 V, 50/60 Hz Power consumption (Studer 928 32/8/4) approx. 400 VA Note: Depending on the application, the on-air mixing consoles can have different configurations. For this reason the abovementioned values are applicable only to a typical configuration;...

  • Page 22: Front View

    928 Mixing Console Dimensions (console) in mm: 12-module 16-module base frame base frame Optional Eurocard rack Optional Eurocard rack Dimensions (supply unit, versions 1.918.210.00...211.81) in mm: Front view View “A” 15...20 480 mm (19") POWER “A” “B” +48V +15V View “B”...
  • Page 23 View “A” 15...20 480 mm (19") POWER “A” A ARM +15V –15V Rear view DC out Link to 2nd PS CONSOLE LINK MA NS 928 console cross section: Headphones jack Optional Eurocard rack Cable duct E 1/8 General Edition: 07.02.01...
  • Page 24 928 Mixing Console CONTENTS 2 Operation ..............E2/1 Mono input unit ............E2/1 Stereo input unit ............E2/5 Mono group unit ............E2/9 Master unit A/B ............E2/12 CR Monitor unit ............E2/14 Studio Monitor unit ............ E2/16 Contents E 2...

  • Page 25: Operation

    928 Mixing Console OPERATION Mono input unit 1.928.220 MASTER ΣA, ΣB Keys for routing the audio signal to the stereo MASTER busses. GROUP 1...8 Keys for routing the audio signal to the GROUP busses. TB DIR. OUT Talk back, momentary pushbutton for talking via the command micro- phone to the electronically balanced Direct Output.
  • Page 26 928 Mixing Console LINE Key for selecting the electronically balanced line input (input trans- former optional). Input sensitivity adjustable in a ±15 dB range with potentiometer LINE [9]. If the LINE key is released, the transformer-balanced MICrophone in- put is selected, and the key is dark.
  • Page 27 928 Mixing Console [16] AUX 7, AUX 8 Outputs to the stereo auxiliary busses 7 and 8. The (pre- or post-fader) input signal can be mixed to the desired AUX bus with the concentric potentiometers. The small knobs are the level controls, while the outer rings are used as PAN controls.
  • Page 28 928 Mixing Console [24] 1, 2, 3, 4 Keys for selecting the four VCA group master faders located on the CR Monitor and Studio Monitor Units. The selected group faders are act- ing on the channel VCA in parallel to the channel fader. If a VCA group master fader is selected, the corresponding key is illuminated.

  • Page 29: Stereo Input Unit

    928 Mixing Console Stereo input unit 1.928.250 MASTER ΣA, ΣB Keys for routing the audio signal to the stereo MASTER busses. GROUP 1-2...7-8 Keys for routing the audio signal to the GROUP bus pairs. TB DIR. OUT “Talk back”, momentary pushbutton for talking via the command mi- crophone to the electronically balanced Direct Output.
  • Page 30 928 Mixing Console SPREAD Control for adjusting the image width from mono (counterclockwise stop position) through normal stereo (detent in center position) to extra wide (clockwise stop position). [10] SPREAD ON Key for activating the SPREAD control [9]. [11] Ø...
  • Page 31 928 Mixing Console [18] If PRE is pressed, the pre-fader signal is mixed to the AUX bus instead of the post-fader signal, and the key is illuminated. [19] PAN/BAL Either panorama or balance potentiometer with detent in center posi- tion. Function selectable with the adjacent, mutually releasing PAN and BAL keys.
  • Page 32 928 Mixing Console [24] START ON Two sets of relay contacts to start/stop external machines are avail- able. These may be set to latching (default) or pulsed operation with jumpers (refer to section 3.1.2). The relays are operative only if the unit's LINE input is selected.

  • Page 33: Mono Group Unit

    928 Mixing Console Mono group unit 1.928.230 MASTER ΣA, ΣB The panned signal is routed to the MASTER busses with the MASTER ΣA and ΣB switches. It may also be routed to the other Group busses. GROUP 1-2...7-8 Keys for routing the group signal to the GROUP busses. The left signal is routed to the odd-numbered groups, and the right signal to the even- numbered groups.
  • Page 34 928 Mixing Console LEVEL Potentiometer to control the input gain. Adjustment range: –∞...+10 dB. Key for connecting the output of the stereo return circuit to the Master busses. Key to activate the CUE function. If the key is pressed for a short time (less than 0.5 s), the function latches;...
  • Page 35 928 Mixing Console GROUP CHANNEL: [16] Electronically balanced insert point. If the INS key is pressed and illu- minated, the signal path is routed via the INSERT SEND/RETURN con- nectors, else the signal path is routed internally. The signal is always available on the INSERT SEND connector, re- gardless of the INS key.

  • Page 36: Master Unit A/B

    928 Mixing Console Master unit A/B 1.928.320/.321 There are two master units (A and B) in a console, each handling a stereo channel, 3 mono AUX masters, and one stereo AUX master. LIMITER: REL. TIME Potentiometer for adjusting the limiter's release time in a range of 200 ms to 10 s.

  • Page 37: Output Level Control

    928 Mixing Console [10] If this key is pressed (and illuminated), the mono signal is tapped after the level control [8] and routed to the CUE system. OUTPUT LEVEL CONTROL: [11] Key to activate the CUE function. If the key is pressed for a short time (less than 0.5 s), the function latches;...

  • Page 38: Cr Monitor Unit

    928 Mixing Console CR Monitor unit 1.928.420 MONITOR SOURCES: EXT. SOURCE 1...8 The EXT. SOURCE bank of mutually releasing switches allows to se- lect one of eight external inputs as external monitor source, if the SOURCE EXT switch [10] is pressed.

  • Page 39: Master Faders

    928 Mixing Console Level control Overall output level control for the monitor speaker outputs. For opti- mum stereo tracking, this potentiometer controls two VCAs [11] MONO If this key is pressed, the left- and right-hand signals are summed to a mono signal for both monitor speakers;...

  • Page 40: Studio Monitor Unit

    928 Mixing Console Studio Monitor unit 1.928.520 TEST GEN. ON Key for activating the internal test generator; if active, the key is illu- minated. The generator output signal is routed to the internal tone bus and (after the LEVEL control [3]) to the internal ΣA and ΣB busses.
  • Page 41 928 Mixing Console [11] TB MIC The input to the talkback system is from the built-un talkback mic. The overall gain of the talkback system is adjusted with the TB MIC potentiometer. [12] Key for routing the talkback signal to the External Talkback output. If active, the key is illuminated.
  • Page 42 928 Mixing Console CRM, ΣA, A7, EXT [21] The input signal for the guest headphones, studio headphones and stu- dio monitor speakers is selected with this bank of mutually releasing selector keys. The selection is CRM (i.e. the same signal as is fed to the control room monitor speakers via the CR Monitor unit), ΣA, AUX 7, or...
  • Page 43 928 Mixing Console CONTENTS 3 Jumper settings, Alignment ..........E3/1 Jumpers ............... E3/1 3.1.1 INPUT UNIT MONO ..........E3/1 3.1.2 INPUT UNIT STEREO ..........E3/5 3.1.3 GROUP UNIT ............E3/7 3.1.4 MASTER UNIT ............E3/8 3.1.5 CR MONITOR ............E3/9 3.1.6...

  • Page 44: Jumper Settings, Alignment

    Instead of the test tone input, on the input unit a second microphone can be connected. For this purpose, the module 1.928.710 must be re- placed by the module 1.928.711, and the jumpers J1 and J2 are to be set as follows:...
  • Page 45 Signalization The 928 mixing console features two signaling busses that are used for on-air signaling and deactivation of the studio speakers. 2-3 (default) Fader start active (not applicable to version 2 of...
  • Page 46 Signalization The 928 mixing console features two signaling buses that are used for on-air signaling and deactivation of the studio speakers. When the microphone channel is opened, the CR monitor is dimmed (DJ mode)
  • Page 47 928 Mixing Console Input channel meters The built-in LED meter can be operated with VU or PPM characteristic and indicate either the input signal, the post-fader signal or the signal on the direct output or N-1 output. 1-2 (default) PPM characteristic...

  • Page 48: Input Unit Stereo

    928 Mixing Console 3.1.2 INPUT UNIT STEREO 1.928.250 Insert With the settings of jumpers J1...J4 the insert point can be placed either before the equalizer or before the fader. Jumper Insert Pre-EQ Insert Pre-Fader 1-3 and 2-4 3-5 and 4-6...
  • Page 49 928 Mixing Console Remote control key With the START key the fader start can be prepared or initiated. If the key is pressed when the fader is closed (dim backlight of the key) the fader start command is executed as soon as the fader is opened and the ON key is activated.

  • Page 50: Group Unit

    928 Mixing Console 3.1.3 GROUP UNIT 1.928.230 Stereo return With the EXT/GRP key, the stereo return signal can be selected either from an external stereo line input or from the internal pre-fader group signal. If in GRP position (key pressed), the signal is tapped before or after the limiter, depending on the position of jumper J1.

  • Page 51: Master Unit

    928 Mixing Console 3.1.4 MASTER UNIT 1.928.320 Insert With the settings of jumpers J2...J5, the insert point of the master chan- nel can be placed either before or after the fader. Pre-fader insert (default) Post-fader insert Talkback closed (default) Talkback signal interrupts the master signal...

  • Page 52: Cr Monitor

    928 Mixing Console 3.1.5 CR MONITOR 1.928.420 Main Board 1.928.420 CR monitor è studio monitor The CR monitor unit can also be used as a studio monitor unit by estab- lishing the following jumper settings: J1 / J3 1-2 (default)

  • Page 53: Studio Monitor

    928 Mixing Console 3.1.6 STUDIO MONITOR 1.928.520 Option TB output of user keys J1 / J2 An external signal is connected to User Output Ground is connected to User Output J5 / J6 Talk to all N-1 outputs Talkback to studio speaker...

  • Page 54: Alignment, General Information

    928 Mixing Console Alignment, general information • The mixing console should be aligned only when it has reached its operating temperature. • For measuring the levels on the line outputs they must not be loaded with less than 10 kΩ.

  • Page 55: Voltage Level ↔ Decibel

    928 Mixing Console Voltage level ↔ Decibel 3.2.2 µV -------------------------------- dBu µV -------------------------------- dBu mV ------------------- dBu mV ------------------- dBu U1/U2 U1/U2 V ------- dBu V ------- dBu 1.00 0.775 –60 –120 31.6 24.5 –30 –90 1.12 0.869 –59 –119 35.5...

  • Page 56: Electrostatically Sensitive Components („Ese")

    928 Mixing Console 3.2.4 Electrostatically sensitive components („ESE“) Many materials of today's working environment are possible sources of static electricity. Under certain conditions persons or objects can be charged to very high voltages – and according to Murphy's Law, these conditions are always met. When discharged, pulses of substan- tial peak power can occur.

  • Page 57: Required Test Equipment And Tools

    2 Module extractors Order No. 1.912.000.06 (1 pce.) Note: The module extractors are contained in the accessories set, order no. 1.928.096.00 (refer to section 1.2.4). • „ESE“ protection set (mat 60 × 70 cm, grounding wrist strap, and grounding cable) Order No.

  • Page 58: Measuring Set-Up

    928 Mixing Console 3.2.7 Measuring set-up Inserting/removing modules: The modules to be aligned must be removed from the console and connected to the bus via bus adapters. The 0 Ω bus amplifiers are sensitive to voltage peaks occurring during hot patching.

  • Page 59: Demagnetizing The Input Transformers

    928 Mixing Console 3.2.8 Demagnetizing the input transformers • Prohibited connection of unbalanced input sources or unintentional shorting of the A and/or B audio line of the microphone inputs to chas- sis when phantom supply is active can drive the input transformers into saturation and cause permanent magnetization (remanence).

  • Page 60: Alignment

    928 Mixing Console Alignment For alignment, the fader unit concerned must be removed from the console and connected to it via bus adapters. Always switch the console off before connecting and disconnecting the modules to avoid damaging the modules. During the alignment, any filters, equalizers, as well as the balance and pan pots must be switched off.

  • Page 61: Input Unit Mono

    928 Mixing Console 3.3.2 Input unit mono 1.928.220 Distortion: Main Board 1.928.220 • Feed test signal with nominal level (1 kHz, typ. +6 or +10 dBu) (component side) to the LINE input. • Set the LINE GAIN and PAN potentiometers to their center positions (CAL.), switch filters off, and set the fader to its 0 dB...

  • Page 62: Input Unit Stereo

    928 Mixing Console 3.3.3 Input unit stereo 1.928.250 Distortion: Main Board 1.928.250 • Feed test signal with nominal level (1 kHz, typ. +6 or +10 dBu) (component side) to the LINE 1 LEFT input. • Set the LINE GAIN potentiometer to center position (CAL.), switch filters off, and set the fader to its 0 dB position.
  • Page 63 928 Mixing Console Direct Output: • Feed test signal with nominal level (1 kHz, typ. +6 or +10 dBu) to the LINE 1 LEFT input (the Direct Output is only influenced by the PAN pot if jumpers J8/J9 are set to “post fader”, position 1-2, see section 3.1.2).

  • Page 64: Master Units A/B

    928 Mixing Console 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, Main Board 1.928.320/321 and the PAN potentiometer is off, all measured levels are low- (component side) er by 3 dB.

  • Page 65: Group Unit

    928 Mixing Console 3.3.5 Group unit 1.928.230 First, verify the jumpers according to the jumpers list in sec- Main Board 1.928.230 tion 3.1.3, in order to prevent the groups from routing to them- (component side) selves (e.g. that group 1/2 can only be routed to all the other groups, but not to group 1/2.

  • Page 66: Cr Monitor Unit

    928 Mixing Console 3.3.6 CR Monitor unit 1.928.420 Distortion: Main Board 1.928.420 • Feed test signal with nominal level (1 kHz, typ. +6 or +10 dBu) (component side) to the left channel of one of the EXT. SOURCE inputs and press the SOURCE EXT.

  • Page 67: Studio Monitor Unit

    928 Mixing Console 3.3.7 Studio Monitor unit 1.928.520 Distortion: Main Board 1.928.520 • Feed test signal with nominal level (1 kHz, typ. +6 or +10 dBu) (component side) to the left channel of one of the EXT. STUDIO MONITOR in- puts and press the EXT pushbutton.

  • Page 68: Vca Masters

    928 Mixing Console 3.3.8 VCA masters (on CR Monitor and Studio Monitor units) (Please refer to the drawings in sections 3.3.6 and 3.3.7). • Feed test signal with nominal level (1 kHz, typ. +6 or +10 dBu) to the LINE input of a mono channel.

  • Page 69: Aux Meters

    928 Mixing Console 3.3.9 AUX meters 1.913.312 PPM: (the VU/PPM selector jumper connects JP1 with JP2): • Feed test signal with nominal lev- el (1 kHz, typ. +6 or +10 dBu) to the LINE input of a mono chan- nel.

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