Wheatstone SP-42 User manual

SP - 40 Series
Audio Production Consoles
Model SP-42 2-track console
Model SP-44 4-track console
Model SP-48 8-track console
TECHNICAL MANUAL
December 1992
Second Edition – For consoles with serial numbers 20556 and up

SP-4 / Dec 92
SP-40 Series Audio Consoles Technical Manual - 2nd Edition
©1992 Wheatstone
®
Corporation
600 Industrial Drive
New Bern, North Carolina 28562
252-638-7000 (Fax [phone])

SP-4 / Apr 00
Addenda
ALL Module Schematics:
All modules now use P&G 8000 series fader with JST connectors. Fader
pinout is as follows:
MONO: STEREO:
Pin 9 HI Pin 9 HI
Pin 8 GND Pin 8 GND
Pin 7 GND Pin 7 GND
Pin 6 WIPER Pin 6 WIPER
Pin 5 NC Pin 5 GND
Pin 4 NC Pin 4 WIPER
Pin 3 NC Pin 3 GND
Pin 2 NC Pin 2 GND
Pin 1 NC Pin 1 HI
If your console's Stereo Line Input Module printed circuit boards
are version SLE-4D, then the following component changes will
apply to the SLE-4C schematics included in this manual:
(1) C70 & C73 capacitor values are changed from 22uF to 100uF.
(2) C71 & C87 capacitor values are changed from 100uF to 22uF.
(3) Integrated circuit U12 (Type 4053) will be implemented differently:
Pins 4, 9, 3 & 5 are now unused (i.e., grounded out) and Pins 14, 11, 13 &
12 are employed instead (i.e., 10K resistor R102 now feeds pin 14, pin 13
feeds capacitor C44, pin 11 feeds pin 9 of U3, and pin 12 goes to ground).
SL-2 Stereo Line Input Module Schematic (SP-42 Console only):
EQ switches "SW2" and "SW4" are not loaded.
GP Group Module Schematic:
If your console is equipped with the optional mix-minus monitor
bus: level control CR2 ("Send 2") is jumper-bypassed and resistor R55
becomes 10KΩ.
If your console has more than one studio module: jumper J6 becomes
a 10KΩresistor and resistor R55 becomes 20KΩ.
Stereo Line Input Schematic (SL-4, SL-42, SL-44, SL-48):
R21 resistor changed from 1K 5% to 4.7K 5%.
Stereo Line Input Schematic (SLE-42, SLE-44, SLE-48):
D7 changed from 1N914 to QMBR130 schottky diode.
Mic/Line Input Modules (MLE-48, MLE-42, MME-48) Schematic
Diagrams:
The SW15 position numbers for Phantom Power and TB To Studio are
incorrectly shown. Phantom Power is position 3, and TB To Studio is
position 4.

Module Removal Tools
Your Wheatstone audio console is equipped with two "module
extractor tools" which are mounted in the front panel of the
console mainframe.
All modules are held into the console mainframe by two mounting
screws (top and bottom) which, whenremoved, leavespecially threaded
holes that accept the two extractor tools.
To remove a module faceplate from the mainframe:
Remove the top and bottom module mounting screws, unscrew the
extractor tools from the mainframe, and screw each tool into a module
mountinghole.Useonlyfourorfive turns (donotover-insert!).Usingthe
extractor tools as handles, pull the module straight up out of the
mainframe.

Contents - Page 1
SP-4 / Dec 92
Table of Contents
CONSOLE OVERVIEW
Series Description............................................................................ 1-1
SP-42/44/48 features table............................................................... 1-2
Input Module Faceplates (dwg)....................................................... 1-3
Mono mic/line input ........................................................................ 1-4
Stereo line input............................................................................... 1-4
Group and Output Module Faceplates (dwg) .................................. 1-5
Group modules ................................................................................ 1-6
Stereo Master Output module.......................................................... 1-4
Control room module ...................................................................... 1-4
Monitor Module Faceplates (dwg) .................................................. 1-7
Accessory Module Faceplates (dwg)............................................... 1-8
Studio module.................................................................................. 1-9
Stereo line selector module ............................................................. 1-9
Tape remote module ........................................................................ 1-9
Superphone module ......................................................................... 1-9
Intercom module............................................................................ 1-10
SP-44 (48) System Signal Flow Diagram ..................................... 1-11
SP-42 System Signal Flow Diagram ............................................. 1-12
Performance Specifications ........................................................... 1-13
INSTALLATION
Placing the Console ......................................................................... 2-1
Console and Cut-out Dimensions .................................................... 2-1
Static VU Alignment ....................................................................... 2-2
Console Power Supply .................................................................... 2-2
Dual Failsafe Supply................................................................... 2-2
System Ground ................................................................................ 2-3
Typical Grounding Scheme (dwg) .............................................. 2-3
Further Grounding Details .......................................................... 2-4
CONSOLE I/O CONNECTIONS
GENERAL ....................................................................................................3-2
AMP Tool Connector System ....................................................................3-2
Balanced vs Unbalanced I/O Connections.................................................3-3
Typical I/O Connections (wiring diagrams) ..............................................3-4
MONO MIC/LINE INPUT MODULE (ML-4)............................................3-5
Audio Connections.....................................................................................3-5
Control Ports ..............................................................................................3-5
Dipswitch Controlled Functions ................................................................3-6

Contents - Page 2
SP-4 / Dec 92
T ABLE OF C ONTENTS
CONSOLE I/O CONNECTIONS (continued)
STEREO LINE INPUT MODULE (SL-4) ...................................................3-7
Audio Connections.....................................................................................3-7
Control Ports ..............................................................................................3-7
Dipswitch Controlled Functions ................................................................3-8
GROUP MODULE (GP-4) ...........................................................................3-9
Audio Connections.....................................................................................3-9
STEREO MASTER OUTPUT MODULE (SM-4).....................................3-10
Audio Connections...................................................................................3-10
CONTROL ROOM MONITOR MODULE (CR-4)...................................3-11
Audio Connections...................................................................................3-11
Auxiliary Control Ports............................................................................3-12
Dipswitch Controlled Functions ..............................................................3-12
STUDIO MONITOR MODULE (optional) (SC-4)....................................3-13
Audio Connections...................................................................................3-13
Control Ports ............................................................................................3-13
Talkback Interrupt Jumpers .....................................................................3-13
SUPERPHONE MODULE (optional) (SPN-4)..........................................3-14
Audio Connections...................................................................................3-14
Control Connections ................................................................................3-14
INTERCOM MODULE (optional) (ICM-4) ..............................................3-15
Audio Input connections ..........................................................................3-15
Control Connections ................................................................................3-15
Audio Output Connections.......................................................................3-15
STEREO LINE SELECT MODULE (optional) (LS-4) .............................3-16
Audio Connections...................................................................................3-16
TAPE REMOTE MODULE (optional).......................................................3-17
OPERATIONAL NOTES
Fader and Level Controls ................................................................ 4-1
Input Assign and Monitor Select Switches ..................................... 4-1
Cueing.............................................................................................. 4-2
Sends................................................................................................ 4-2
Subgroups ........................................................................................ 4-2
Talkback .......................................................................................... 4-2

Contents - Page 3
SP-4 / Dec 92
T ABLE OF C ONTENTS
SCHEMATIC DRAWINGS
Typical module printed circuit board .............................................. 5-2
Mono mic/line input module (SP-44/48)......................................... 5-3
Mono mic/line input module (SP-42).............................................. 5-4
Dual mic input module (SP-44/48).................................................5-4a
Stereo line input module (SP-44/48) ............................................... 5-5
Stereo line input module (SP-42) .................................................... 5-6
Group Module ................................................................................. 5-7
Master Output Module (SP-44/48) .................................................. 5-8
Master Output Module (SP-42) ....................................................... 5-9
Control Room Monitor Module (SP-44/48) .................................. 5-10
Control Room Monitor Module (SP-42) ....................................... 5-11
Studio Monitor Module (SP-44/48) (optional).............................. 5-12
Studio Monitor Module (SP-42) (optional) ................................... 5-13
Stereo Line Select Module (optional)............................................ 5-14
Superphone Module (optional)...................................................... 5-15
Intercom Module (optional) .......................................................... 5-16
Tape Remote Module (optional) ................................................... 5-17
Digital Timer ................................................................................. 5-18
Power Supply................................................................................. 5-19
Failsafe Switchover Panel (optional)............................................. 5-20
TROUBLESHOOTING
Basic Troubleshooting Procedures .................................................. 6-1
Integrated Circuits ........................................................................... 6-2
Other Details.................................................................................... 6-3
SP-4 / April 95

Page 1 - 1
SP-4 / Dec 92
C ONSOLE O VERVIEW
Console Overview
CHAPTER CONTENTS
Series Description............................................................................ 1-1
SP-42/44/48 features table............................................................... 1-2
Input Module Faceplates (dwg)....................................................... 1-3
Mono mic/line input ........................................................................ 1-4
Stereo line input............................................................................... 1-4
Group and Output Module Faceplates (dwg) .................................. 1-5
Group modules ................................................................................ 1-6
Stereo Master Output module.......................................................... 1-4
Control room module ...................................................................... 1-4
Monitor Module Faceplates (dwg) .................................................. 1-7
Accessory Module Faceplates (dwg)............................................... 1-8
Studio module.................................................................................. 1-9
Stereo line selector module ............................................................. 1-9
Tape remote module ........................................................................ 1-9
Superphone module ......................................................................... 1-9
Intercom module............................................................................ 1-10
SP-44 (48) System Signal Flow Diagram ..................................... 1-11
SP-42 System Signal Flow Diagram ............................................. 1-12
Performance Specifications ........................................................... 1-13
SP–40 SERIES DESCRIPTION
The Wheatstone SP-40 console series is a dual purpose design intended for
applications where the console will be used for both production work and on-
air applications. As such, its module layout has characteristics similar to both
traditional on-air boards and production models. Generally speaking, the
lower half of a typical input module emulates on-air control layout, while the
upper half contains equalization and send controls. This hybrid architecture
allows both production and on-air personnel to easily learn and operate all
models of the series.
There are three models: the SP-42 (intended for 2-track use), the SP-44 (4-
track) and the SP-48 (8-track). All models are similar in layout, but differ
primarily in the number of outputs available. The standard model is the SP-44.
SP-44 Four-track Production Console
This console comes equipped with four subgroups, two stereo outputs
(Program and Audition), one mono sum output (Program L+R), one mix-
minus output, three auxiliary sends and cue. Intended to interface with a four-
track tape recorder (the subgroup outputs feed the recorder; multitrack playback
is normally through the subgroups' tape inputs), the console may be ordered
with 16 or 24 input channels. The mainframe includes VU meters for the
subgroups, Program (left & right), Audition (left & right), and Mono (Program
L+R). Group VUs can also meter the three sends and mix-minus, via front
panel switching on the subgroup modules. A control room monitor module is
standard equipment. The mainframe has room for five accessory modules
(three on the right and two on the left).

Page 1 - 2
SP-4 / Dec 92
C ONSOLE O VERVIEW C ONSOLE O VERVIEW
SP-48 Eight-track Production Console
This is the 8-track version of the console series. It is identical with the SP-
44 except it has eight subgroup channels instead of four. This also means there
are an additional four VU meters housed in the mainframe. The SP-48 comes
with 24 inputs.
SP-42 Two-track Transfer Console
This compact unit (26 by 26 inches) has 12 inputs and is designed to interface
directly to a 2-track tape machine. It has two stereo outputs (Program and
Audition), two auxiliary sends and cue. Four VU meters (Program and
Audition left and right) are included. The mainframe includes a control room
monitor module and has room for two accessory modules (righthand frame
positions only).
SP- 40 Series Standard Features Listing by Console Model
SP-40 CONSOLE SERIES FEATURES
SP-42
SP-44
SP-48
MAINFRAME POSITIONS
16
24/33
35
INPUTS
12
16/24
24
GROUPS
4
8
CONTROL ROOM MODULE
Y
Y
Y
STEREO PROGRAM OUT
Y
Y
Y
STEREO AUDITION OUT
Y
Y
Y
MONO SUM (PGM L+R) OUT
Y
Y
MIX-MINUS OUT
Y
Y
CUE
Y
Y
Y
SEND BUSSES
2
3
3
TIMER
Y
Y
Y
GROUP METERS
4
8
PROGRAM METERS (L & R)
Y
Y
Y
AUDITION METERS (L & R)
Y
Y
Y
SEND METERS (switched w/Group VUs 1-3)
Y
Y
MIX-MINUS METER (switched w/Group VU 4)
Y
Y
LEFTHAND ACCESSORY POSITIONS
2
2
RIGHTHAND ACCESSORY POSITIONS
2
3
3

Page 1 - 3
SP-4 / Dec 92
C ONSOLE O VERVIEW
Input Modules – SP-40 Series Audio Consoles
Mono Input
SP-42 Mono Input SP-44 Mono Input SP-48 Stereo Input SP-42 Stereo Input SP-44 Stereo Input SP-48
ML- 4
GAIN10 9
8
7
6
5
4
3
2
10
MIC / LINE
M
I
C
16 14
-dB+
11
6
3
0
3
6
11
1416
10K/ 5K
PHASE
100 / 50
-dB+
11
3
0
3
11
-dB+ 1614
11
6
3
0
3
6
11
14 16
EQ IN
A
S
S
I
G
N
C
L R
P
A
N
1
2
3
4
B
U
S
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
1/2
S2 9
8
7
64
3
2
1S1
3
10 9
8
7
6
5
4
3
2
10
CUE
PRE IN
S
E
N
D
S
L
PAN
LEVEL
dB
5
LINE
TRIM
SL- 4
A / B LINE
16 14
-dB+
11
6
3
0
3
6
11
14 16
1K / 500
-dB+ 1614
11
6
3
0
3
6
11
14 16
EQ IN
A
S
S
I
G
N
C
L R
B
A
L
1 / 2
3 / 4
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
1/2
9
8
7
64
3
2
1
3
10 9
8
7
6
5
4
3
2
10
CUE
PRE IN
S
E
N
D
S
LT
RT
GAIN
-dB+
11
6
3
0
3
6
11
14 16 16 14
B
B
U
S
5
SL- 2
A / B LINE
16 14
-dB+
11
6
3
0
3
6
11
14 16
1K / 500
-dB+ 1614
11
6
3
0
3
6
11
1416
EQ IN
A
S
S
I
G
N
C
L R
B
A
L
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
CUE
LT
RT
GAIN
-dB+
11
6
3
0
3
6
11
1416 16 14
1
10 9
8
7
64
3
2
10
2
10 9
8
7
6
5
4
3
2
10
PRE IN
S
E
N
D
S
B
5
ML- 48
GAIN10 9
8
7
6
5
4
3
2
10
MIC / LINE
M
I
C
16 14
-dB+
11
6
3
0
3
6
11
14 16
10K/ 5K
PHASE
100 / 50
-dB+
11
3
0
3
11
-dB+ 1614
11
6
3
0
3
6
11
1416
EQ IN
A
S
S
I
G
N
C
L R
P
A
N
1 / 2
3 / 4
5 / 6
7 / 8
B
U
S
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
1/2
9
8
7
64
3
2
1
3
10 9
8
7
6
5
4
3
2
10
CUE
PRE IN
S
E
N
D
S
L
dB
5
LINE
TRIM
ML- 2
GAIN10 9
8
7
6
5
4
3
2
10
MIC / LINE
M
I
C
16 14
-dB+
11
6
3
0
3
6
11
1416
10K/ 5K
PHASE
100 / 50
-dB+
11
3
0
3
11
-dB+16 14
11
6
3
0
3
6
11
1416
EQ IN
A
S
S
I
G
N
C
L R
P
A
N
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
CUE
110 9
8
7
64
3
2
10
210 9
8
7
6
5
4
3
2
10
PRE IN
S
E
N
D
S
L
dB
5
LINE
TRIM
S2S1
PAN
LEVEL S2S1
BAL
LEVEL
SL- 48
A / B LINE
16 14
-dB+
11
6
3
0
3
6
11
14 16
1K / 500
10K / 5K
100 / 50
-dB+16 14
11
6
3
0
3
6
11
14 16
EQ IN
A
S
S
I
G
N
C
L R
B
A
L
1 / 2
3 / 4
5 / 6
7 / 8
B
U
S
0
5
10
15
20
30
40
50
60
70
0
0
M
I
D
H
I
G
H
L
O
W
1/2
9
8
7
64
3
2
1
3
10 9
8
7
6
5
4
3
2
10
CUE
PRE IN
S
E
N
D
S
LT
RT
GAIN
-dB+
11
6
3
0
3
6
11
14 16 16 14
B
5
S2S1
BAL
LEVEL
8K 7K
5K2K
500
400
Hz
8K 7K
5K2K
500
400
Hz
8K 7K
5K2K
500
400
Hz
AUD
PGM
ON
OFF
AUD
PGM
ON
OFF
AUD
PGM
ON
OFF
PGM
AUD
ON
OFF
AUD
PGM
ON
OFF
ON
AUD
OFF
PGM