Labo K Effects Studer 900 User manual

Labo ★ K Effects – www.labo-k-effects.com – [e-mail]
Connection kit for studer 900 preampli+equaliser

Labo ★ K Effects – www.labo-k-effects.com – [e-mail]
2
contents
INTRODUCTION 3
KIT OVERVIEW 4
ASSEMBLY INSTRUCTIONS 5
BUILDING THE RIBBONS CABLES 5
STUDER 900 P6 INTERFACE BOARD PART LIST 6
CONNECTOR X2 PINOUT 6
STUDER 900 P4 INTERFACE BOARD PART LIST 7
CONNECTOR X1 (PSU BUS) PINOUT 7
CONNECTOR X2 (PSU OUT) PINOUT 7
INPUT OUTPUT BOARD COMPONENTS PART LIST 8
INPUT INTERFACE BOARD PINOUT 10
INSTRUMENT INPUT COMPONENTS PART LIST 11
WIRING OF THE STUDER 900KIT 12
DRILLING TEMPLATE 13

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Introduction
This kit allows to interconnect Studer 900 preamp and equalizer module to put them in a
Rack. The kit allows to connect inputs, outputs and power supply necessary for the use
of the set.
Optional accessories
Labo
★
K Effects Studer 900 PSU Kit
Regulated PSU
+48V, +/-15V, -25V, -5V
(Kit or PCB + Metalwork only)
Transformer 2x24V not supplied
Studer 900 PCB+METALWORK
Allows to fix the pcbs and the radiator of
the power supply.
The compact unit can thus be easily fixed
in the rack..
For proper operation of the unit, it is advisable to use modules in good
conditions and with coupling capacitors that will have been replaced if
necessary.
The poor condition of the capacitors can greatly affect the sound quality or
even cut the signal. Similary, one will ensure that the various switches have been
cleaned using a contact cleaner spray.

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Kit overview
§ 1 Interconnect board PCB 2 layers plated pads for connecting:
§ Studer P6 connector (In/out)
o 1 Micro input
o 1 Ligne input
o 1 insertion Snd
o 1 insertion Rtn
o 1 Output
§ 1 Interconnect board PCB 2 layers plated pads for connecting:
§ Studer P4 connector (Power Supply)
o 1 power supply -25V, +/-15V, -6V and 48V (connector x1)
o Power supply for the output card (connector X2)
o 1 Interconnect board PCB 2 layers plated pads for connecting:
o The input/output card (P6)
o 1 +4dB balanced output stage (located on the board).
o The power supply of the card
o An output potentiometer (Not supplied)
o An optional High impedance input
§
§ Connectors, components

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Assembly instructions
1) Solder components on the PCB.
2) Prepare interconnection ribbons
3) Prepare the audio wires
4) Fix the in / Out card
5) Connect the cards to connectors p4 et p6.
6) Connect PSU BUS to a regulated power supply +48v, 0V, +15V/-15V -25V
et -6V.
7) Connect the power supply ribbon to the PSU Out bus of the P4 board
Building the ribbons cables
BUS PSU
Input/Output board power supplies

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studer 900 p6 interface board part list
Connector X2 Molex 22-27-2101-10
Connector 1 Din 41612
R1, R2
6K81
R3
470R
C1
47µF/63v
All resistors are 1/4w metal film 1%
It is intended to wire an Insert between the channel (pre-EQ) and the output stage.
If this option is not used, the SND and RTN points must be connected using a jumper as
shown below.
connector X2 pinout
1
Mic in Hi
2
Mic in Lo
3
GND
4
GND
5
Line In Lo
6
Line In HI
7
Unbalanced OUT
8
GND
9
NC
10
NC

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studer 900 p4 interface board part list
Connectors X1, X2 IDC 2516-6002
Connector 5 Din 41612
connector x1 (psu bus) pinout
1
+48V
2
+48V
3
GND
4
GND
5
GND
6
GND
7
+15V
8
+15V
9
+15V
10
-25V
11
-25V
12
-6V
13
-6V
14
-15V
15
-15V
16
-15V
connector x2(psu OUT) pinout
1
+15V
2
+15V
3
+15V
4
+15V
5
GND
6
GND
7
GND
8
GND
9
-15V
10
-15V
11
-15V
12
-15V
13
+48V
14
+48V
15
+48V
16
+48V

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input output board components part list
Designation
Qnt
Reference
XLR F Neutriik NC3FAHR2
2
Mic/Line
XLR M Neutrik NC3MAHR
1
Out
X1 Molex 22-27-2101-10
1
In/out
PSU2 IDC 2516-6002
1
680R
1
1K2
1
18K
1
10KA (pot) Not supplied
1
22p Ceramic
1
100n Ceramic
4
10uF BP
2
100µF/16v
1
THAT 1646
1
NE5534
1
DIL 8 socket
2
Molex 22-01-2105
2
crimp terminal
Molex 08-50-0005
16
All resistors are 1/4w metal film 1%

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Component layout
The places on the card not used for this kit are hidden.
Place straps (component tails) where they are marked with yellow lines.
It is possible to wire an output potentiometer (not supplied)
In this case, do not implant the strap surrounded by a red circle.
Wiring the optional 10K linear potentiometer with a shielded wire
(GND shown in black)
It is planned to be able to install a 3-pin Molex connector.

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input interface board pinout
Input / Output connector
1
Mic input Lo
2
Mic input Hi
3
Mic input Screen
4
Line input Screen
5
Line input Hi
6
Line input Lo
7
Output unbalanced
8
Output Screen
9
Output Hi (NC)
10
Output Lo (NC)
Wiring of inputs and outputs
(GND shown in black)