Wheatstone SP-8 User manual

T
TE EC CH HN NI IC CA AL L
M
MA AN NU UA AL L
SP-8Audio Console
600 Industrial Drive, New Bern, N.C. 28562 (tel [phone] / fax [phone] / [e-mail])
®

SP-8 / Mar 99
SP-8 Series Audio Consoles Technical Manual (revised)
©1999 Wheatstone
®
Corporation
600 Industrial Drive
New Bern, North Carolina 28562
252-638-7000 (Fax [phone])

IMPORTANT
In order to pass audio through your new console,
you must wire up insertion points in certain modules.
See the DB-25 pinout section in your manual for details:
SP-8
Note in particular
MG-08 group module,
SM-08, MM-08 output modules.
MG-08 (see page 3-4): connect CH1 insert out HI to CH1 insert in HI, CH1 insert out LO to
CH1 insert in LO, CH2 insert out HI to CH2 insert in HI, CH2 insert out LO to CH2 insert in
LO,SEND insert out HI to SEND insert in HI and SEND insert out LO to SEND insert in LO.
SM-08 (see page 3-8): connect LT insert out HI to LT insert in HI, LT insert out LO to LT insert
in LO, RT insert out HI to RT insert in HI and RT insert out LO to RT insert in LO.
MM-08 (see page 3-12): connect SUM insert out HI to SUM insert in HI, SUM insert out LO to
SUM insert in LO, MONO insert out HI to MONO insert in HI and MONO insert out LO to
MONO insert in LO.

SP-8 / August 2000
Addenda
IMPORTANT: The SP-8 audio console is a modular design, intended for
custom configuration per specific client requirements. Thus, the technical
drawings in this manual, which document all available options, may show
features and circuitry that do not appear on your specific console.
Please note the following additions and corrections to this
technical manual.
CS-08 CONTROL ROOM/MONITOR MODULE:
Resistiors R56, R57 and R61, R62 (24Ω) have been changed to polyswitches R56 and R61 (.17A).
Resistor R101 is now 40.2K.
METERBRIDGE PRESELECTOR (MBLS):
R17, R18 have been changed from 1kΩto 750Ω.

Contents - Page 1
SP-8 / Dec 95
Table of Contents
SP-8 / Apr 99
INSTALLATION
Mounting the Console to the Leg Stand ....................................................1-1
Console Power Supply ...............................................................................1-2
Dual Failsafe Supply .............................................................................1-2
Power Supply Schematic ......................................................................1-3
Power Supply PCB Drawing.................................................................1-4
Power Supply Relay Card Schematic ...................................................1-5
Power Supply Relay Card Load Sheet Drawing................................... 1-6
System Ground...........................................................................................1-7
Typical Grounding Scheme (dwg)........................................................1-7
Further Grounding Details ....................................................................1-8
INPUT MODULES
Mono mic/line input ........................................................................ 2-2
Signal Flow Diagram .................................................................. 2-2
Front Panel Controls ................................................................... 2-3
Logic Functions........................................................................... 2-4
DipswitchProgrammable Features ............................................. 2-4
I/O Connections .......................................................................... 2-5
Printed Circuit Card Dwg ........................................................... 2-6
Schematic .................................................................................... 2-7
Bus Assign Switch Card PCB Dwg .......................................... 2-12
Bus Assign Switch Card Schematic.......................................... 2-13
Cue Switch Card PCB Dwg ...................................................... 2-14
Cue Switch Card Schematic...................................................... 2-15
Dual Mono mic input..................................................................... 2-16
Signal Flow Diagram ................................................................ 2-16
Front Panel Controls ................................................................. 2-17
Logic Functions......................................................................... 2-18
DipswitchProgrammable Features ........................................... 2-18
I/O Connections ........................................................................ 2-19
Printed Circuit Card Dwg ......................................................... 2-20
Phantom Power Switch Card PCB Dwg ................................... 2-21
Phantom Power Switch Card Schematic..................................2-21a
Schematic .................................................................................. 2-22
Bus Assign Switch Card PCB Dwg .......................................... 2-27
Bus Assign Switch Card Schematic.......................................... 2-28
Cue Switch Card PCB Dwg ...................................................... 2-29
Cue Switch Card Schematic...................................................... 2-30

Contents - Page 2
SP-8 / Dec 95
T ABLE OF C ONTENTS
SP-8 / Dec 96
Dual mono line input ..................................................................... 2-31
Signal Flow Diagram ................................................................ 2-31
Front Panel Controls ................................................................. 2-32
Logic Functions......................................................................... 2-33
DipswitchProgrammable Features ........................................... 2-33
I/O Connections ........................................................................ 2-34
Printed Circuit Card Dwg ......................................................... 2-35
Schematic .................................................................................. 2-36
Mode Switch Card PCB Dwg ................................................... 2-41
Mode Switch Card Schematic................................................... 2-42
Cue Switch Card PCB Dwg ...................................................... 2-43
Cue Switch Card Schematic...................................................... 2-44
Stereo line input............................................................................. 2-45
Signal Flow Diagram ................................................................ 2-45
Front Panel Controls ................................................................. 2-46
Logic Functions......................................................................... 2-47
DipswitchProgrammable Features ........................................... 2-47
I/O Connections ........................................................................ 2-48
Printed Circuit Card Dwg ......................................................... 2-49
Schematic .................................................................................. 2-50
Mode Switch Card PCB Dwg ................................................... 2-55
Mode Switch Card Schematic................................................... 2-56
Cue Switch Card PCB Dwg ...................................................... 2-57
Cue Switch Card Schematic...................................................... 2-58
GROUPSAND OUTPUT MODULES
GroupSubmasters ........................................................................... 3-2
Signal Flow Diagram .................................................................. 3-2
Front Panel Controls ................................................................... 3-3
I/O Connections .......................................................................... 3-4
Printed Circuit Card Dwg ........................................................... 3-5
Master Stereo Output....................................................................... 3-6
Signal Flow Diagram .................................................................. 3-6
Front Panel Controls ................................................................... 3-7
I/O Connections .......................................................................... 3-8
Printed Circuit Card Dwg ........................................................... 3-9
Mono Master Output ..................................................................... 3-10
Signal Flow Diagram ................................................................ 3-10
Front Panel Controls ................................................................. 3-11
I/O Connections ........................................................................ 3-12
Printed Circuit Card Dwg ......................................................... 3-13
Group/OutputModules
Schematic .................................................................................. 3-14
DC Offset Card Schematic........................................................ 3-19

Contents - Page 3
SP-8 / Dec 95
MONITOR AND OPTIONAL MODULES
Control Room/Studio Monitor ....................................................... 4-2
Signal Flow Diagram .................................................................. 4-2
Front Panel Controls ................................................................... 4-3
I/O Connections .......................................................................... 4-4
Printed Circuit Card .................................................................... 4-6
Schematic .................................................................................... 4-7
Optional Second Studio ................................................................... 4-9
Signal Flow Diagram .................................................................. 4-9
I/O Connection .......................................................................... 4-10
Schematic .................................................................................. 4-11
Optional Line Selector................................................................... 4-12
I/O Connections ........................................................................ 4-13
Schematic .................................................................................. 4-14
Optional Tape Remote................................................................... 4-15
I/O Connections ........................................................................ 4-16
Schematic .................................................................................. 4-17
Clock Printed Circuit Card ............................................................ 4-18
Clock Control Printed Cicuit Card ................................................ 4-19
Clock/Clock Control Schematic................................................ 4-20
Timer Printed Circuit Card............................................................ 4-21
Timer Control Printed Circuit Card............................................... 4-22
Timer/Timer Control Schematic ............................................... 4-23
Optional Meterbridge Pre-Select ................................................... 4-24
I/O Connections ........................................................................ 4-25
Printed Circuit Card .................................................................. 4-26
Schematic .................................................................................. 4-27
APPENDIX
BALANCED vs UNBALANCED I/O CONNECTIONS ........................A-1
Typical Unbalanced Connections (dwg) ............................................A-2
NOTES ON LEVEL MEASUREMENT.................................................. A-3
TROUBLESHOOTING............................................................................ A-3
Basic Procedures ................................................................................ A-3
Testing a "Live" Console – Precautions............................................. A-3
Integrated Circuits .............................................................................. A-4
OTHER DETAILS.................................................................................... A-5
FURNITURE LEG SET ASSEMBLY INSTRUCTIONS....................... A-6
SP-8 / Dec 96SP-8 / Mar 99

Page 1 - 1
SP-8 / Dec 95
Installation
Mounting the Console to the Leg Stand
This SP-8 series console comes supplied with a factory leg support. The
console leg furniture consists of four pieces:
two end panels – the curved edge goes towards the front (armrest) of the
console.
frontspanningpanel–thismountsbetweenthetwosidepanels,justahead
of the vertical center aluminum brackets. The narrow finished wooden strip
(cherry) is the bottom; the wider unfinished (pine) strip is the top.
rearspanning panel– mounts between the two side panels, along the rear
edge. The rear panel differs from the front panel in that it has been pre-drilled
with four 1/4" holes that accept enamel-finished #10 machine screws that go
into four tapped holes on the side panels' rear vertical brackets. Note when
correctlymountedintoplacethereisa5/8"gapbetweenthebottomoftherear
panelandthefloortoallowconsolewiringtoexitthelegassembly.Onceagain,
the finished wood strip is the bottom; the wider pin strip is the top.
The SP-8 leg stand has been pre-assembled at the factory and then broken
downforshipment.Allassemblyholes havebeenpre-drilled. Tore-assemble
the leg stand:
(1) attach the two side panels to the front spanning panel, using the eight
screws provided. The bottom of the panel should flush with the floor and the
bottom edge of the side panels. The side panel curves should face front.
(2) Attach the rear spanning panel to the side panels' rear vertical brackets,
usingthefinished#10screwsprovided. Note the finished wooden edgeofthe
panel (cherry) should be along the lower edge approximately 5/8" from the
floor. (This step "squares up" the leg assembly and readies it for the console.)
(3)RemovetheSP-8console'srearconcealmentpanelandplacetheconsole
onthelegstand,withthearmrestfacingforward.Notetheconsolewoodenend
pieces just straddle the leg stand side pieces. Roughly align the console front
to back so the rear edge of the console side pieces are roughly even with the
back edge of the leg stand side pieces.
(4)Removethelegstandrearspanningpaneltogainaccesstotheunderside
of the console.
(5) Note the wooden bottom of the console has been pre-drilled to accept
screws coming up through the top of the front spanning panel and to accept
screwsfromtworearside brackets already pre-attached tothelegsidepieces.
Ifnecessary, makeafinalfront-to-backadjustmentoftheconsolesotheholes
onthebracketsandspanningpanelpinestriplineupwiththepre-drilledholes
in the bottom of the console.
CHAPTER CONTENTS
Mounting the Console to the Leg Stand .......................................... 1-1
Console Power Supply .................................................................... 1-2
Dual Failsafe Supply................................................................... 1-2
Power Supply Schematic ............................................................ 1-3
Power Supply PCB Drawing....................................................... 1-4
Power Supply Relay Card Schematic ......................................... 1-5
Power Supply Relay Card Load Sheet Drawing......................... 1-6
System Ground ................................................................................ 1-7
Typical Grounding Scheme (dwg).............................................. 1-7
Further Grounding Details .......................................................... 1-8
SP-8 / Apr 99

Page 1 - 2
SP-8 / Dec 95
I NSTALLATION
SP-8 / Apr 99
(6) Attach the console to the leg stand using the screws provided.
(7) Re-attach the rear spanning panel.
(8) Re-attach the console rear concealment panel.
THE CONSOLE POWER SUPPLY
The console power supply is a standard 19" rackmount unit. It should be
mountedinanadjacentequipmentrackwithin15feet(butpreferablynocloser
than 3 feet) of the console. The mounting location should allow proper air
circulation around the unit. Avoid locating any high gain equipment (such as
phono preamps, tape recorders, etc.) too near the power supply, to avoid
magnetic interference into that equipment.
The power supply is fitted with a 3-wire grounded AC cord that should be
plugged into a clean 120V AC outlet (that is, an AC source that feeds only the
controlroomaudiogear). ThisACsourceshouldbeaseparatefeedfromthose
powering lighting, air-conditioning, or any other non-audio machinery. The
third pin ground wire of the AC source should be tied to the central system
ground point (see SYSTEM GROUND below).
Withthepowersupplyinplace, plugintheACpowercord. Notethe power
supplyusesa3-ampslo-blofuse(backofchassis). ThefiveLEDindicatorson
thesupply'sfrontpanelshouldlightup(PHANTOM,+V,–V,+5V,and+24V).
Unplug the power supply and connect it to the console, using the supplied
multi-conductorcable. Notethecableplugsintothebackofthesupplychassis
andintothebottomoftheconsole(righthandend). Withtheconsoleconnected,
re-energize the power supply. The display indicators should again light; the
console'sVUmetersshouldlightup,andindividualmoduleON/OFFswitches
and green CUE LEDs will power up randomly.
Dual Failsafe Supply
Yourconsolemayhavebeenorderedwithadualfailsafeoption;inthiscase
youwillhavetwoseparaterackmountsupplies. Ifthisisthecase,thenconnect
both supplies to the console with the two cables supplied. Note that both
supplies must be energized for the failsafe function to work.
The first major installation step is to make sure the console is properly
grounded. Unplug the power supply, and proceed with the next section,
"SystemGround".
The power feed recommended
in the text is often installed and
referred to in studios as an
"isolated AC ground" outlet.
It is usually orange in color.

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SP-8/Aug 2001