Russco Studio/Master 505S User manual

www.SteamPoweredRadio.Com

www.SteamPoweredRadio.Com
STUDIO/MASTER 505S
5 CHANNEL STEREO BROADCAST AUDIO MIXER
WARRAN TY
All Russco products are warranted aga i nst defect s in
workmanship and materials for a pe r iod of one year
from the date of del ivery. We will repair or replace
products whi ch prove to be defect i ve dur i ng the war-
ranty period provided they are returned to Russco.
Warranty subject
to cancellation if in the opinion of
Russco the product has been either unduly tampered
with or modified so as to cause failure beyond our
control. No other warranty is expressed or implied.
We are not liable for conseque nt i al damages.
RUSSCO ELECTRONICS MFG., INC.
5690 East Sh ields
Fresno, Californi a 93727

www.SteamPoweredRadio.Com
Studio/Master 505S/505SR
Table of Contents
TABLE OF CONTENTS
Section
Page
I.
GENERAL I NFORMATION ....... .. ..... . ..... . . 1-1
1-1. Description . .. . .................... 1-1
1-9. Specifications . . ...... .. ... .. .... . . 1-2
1-11. Accessories . ..... .. .... .. . .... .... .1- 2
II.
INSTALLATION ... .. ..... .. .. .............. . 2-1
2-1. Unpacking ...................... .. .. 2-1
2-4. Mounting ........................... 2-1
2-8. Input Assignments . . . . .............. 2-1
2-12. Input Connections . . . . ........ .. .... 2-2
2- 19. Output Connections ................. 2-3
2- 32. Power Connection .. . ............... . 2-4
2-34. Ground Connection ................ . . 2-4
.III.
CALIBRATION ... . ............ . ... . . ... ..... 3-1
3-1. Jumper Settings .................... 3-1
3-11. Level Settings ... . . .... ... ......... 3-2
IV.
SPECIAL MODIFICATIONS .......... · ....... . .. 4-1
4-1. High Level Switch Termination ..... . 4-1
4-4. Remote Start of Equipment ..... . .... 4-1
4-10. Remote Control of Channel 1- 4 ...... 4-2
V.
OPERATING INSTRUCTIONS ................... 5-1
5-1. General . . .......................... 5-1
5-5. Controls and Indicators ... ......... 5-1
5-19. Operations Method ............... . .. 5-3
VI.
THEORY OF OPERATION ........ . .. ........... 6-1
6-1. General ......... ... ....... ....... .. 6-1
6-3. Block Diagram .... . .... ....... ...... 6-1
6-11. Input Pads ...................... . .. 6-3
6-13. Integrated Circuits ................ 6- 3
6-17. Equalization ....................... 6-3
6- 19. Booster Amplifier ........ . ........ . 6-3
6-21. Cue Amplifier ...................... 6-4
6-23. Headphone Amplifier .......... . ..... 6- 4
6-25. Power Supply ....................... 6-4
6-28. Monitor Buffer ....... . ........ . .... 6-4
6- 30. FET Switches ................ . ...... 6-4
VII.
MAINTENANCE .............................. 7-1
7-1. General ............................ 7- 1
7-3 . Dismantling for Service Access ..... 7-1
7-10. Changing Pots ..... . ............... . 7-2
7- 12. General Repair ................... .. 7-2
7-17. Changing Integrated Circuits ....... 7- 3
7-19. Returning for Service .............. 7-3
7-21. Serial Number ...................... 7-4
VIII . SCHEMATICS ......... . ..................... 8-1
8-1 . Introduction ....................... 8-1
IX. REPLACEMENT PARTS ................. . .. . ... 9-1
9-1 . Introduction ................... . ... 9-1
i
190- 011

www.SteamPoweredRadio.Com
Studio/Master 505S/505SR
Table of Contents
LIST OF TABLES
Number
Page
1-1 Specifications ........ . .................. .. . .. ........... 1-3
1-2 General Information ................... .. ................ 1-4
2-1 Factory Settings of Jumper Options . .................... . 2-3
3-1 Identification & Color Coding of Jumpers ................ 3-3
7-1 Trouble Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7- 5
9-1 Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
LIST OF ILLUSTRATIO NS
Number
Page
1-1 Studio/Master 505S/505SR Audio Mixer/Console .... ...... .. . 1-0
2-1 Typical Input Configuration, Using Factory Se ttings ...... 2-2
2- 2 Typical Output Connections ........... .. .................. 2 -5
3-1 General Parts Locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3-2 Main Board Pot & Jumper Locations . . ...................... 3- 5
3-3 Cue, Mute & Stereo/Mono Jumper Locations ................. 3-6
3-4 Preamp Board Jumpers ... . ...... ... . ....................... 3-7
5-1 Front Panel Controls .......................... . ...... .... 5-2
6-1 Block Diagram ....................... ... .................. 6-2
7-1 Signal Tracing Setup ... ... ............................... 7-4
8-1 Pr eamp P.C. Board . ................... . ...... .. ........... 8-2
8-2 Main P. C. Boa rd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
8-3 Pot P.C. Board ........ . .................................. 8-3
8-4 Schematic.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Number
9-9
9-10
9-11
190-011
ADDENDUM
Page
Level Diagram .................. . . . ... .... ... ... ... ....... 9 -9
Cartridge Response ....................................... 9-10
Hi-Gain Modification ................. .. ... . .............. 9-11
ii

www.SteamPoweredRadio.Com
Studio/Master 505S/505SR
Section I
DESK MOUNT
RACK MOUNT
Figure 1-1. Studio/Master 505S/505SR Audio Mixer Console
1-0
109-011

www.SteamPoweredRadio.Com
Studio/Master SOSS/505 SR
Section I
SECTION I
GENERAL INFORMATION
1-1 . DESCRIPTION
109-011
1-2 . The Russco Studio/Master SOSS Audio/Mixer Console
is a professional stereo audio mixer designed for
broadcast studio applications where five mixing
channels provides adequate flexibility. The SOS
features built-in preamps on mixers 1 thru 4 and
five balanced high level inputs on mixer 5. Also
featured is cue on all channels, light emitting
diode (LED) indicators, headphone amp, on-the-air
warning light relay driver and field-effect
transistor (FET) muting for the monitor output .
1-3 . Cue and mute features can be deleted from any
channel by removing jumpers on the mixer printed
circuit board. The preamps can be modified for
RIAA phono , microphone or hi level unbalanced
input by moving jumpers on the pc board.
1-4. The SOSS comes with a finished cover for desk top
installation. The rack mount version (model
SOSSR) is supplied without the cover . It mounts
in an EIA standard 19
11
rack taking 5 1/4" of
vertical space .
1-5 . The SOSS uses integrated circuit ampli f iers through -
out , with power transistors to drive the cue and
headphone outputs. The output line impedance is
600 ohms, balanced . The VU meter features true
VU ballistics.
1-6 . The monitor output is driven by a low impedance
output line amplifier. The monitor amplifier
may be located away from the console.
1-7 . Audio switching on channels 1-4 is done with
solid state field-effect transistors (FET) .
These switches can be remote controlled by
DC switching.
1-8 . Any monaural source may be split to feed both
outputs by movin g a jumper on the pot . P.C.
board. This causes no additional loading on
the source.
1-1

www.SteamPoweredRadio.Com
Studio/Master 505S/SOSSR
Section I
1-2
1-9. SPECIFICATIONS
1-10 . Table 1 -1 lists the specifications for the Studio/
Master 505S. General information is listed in
Table 1-2.
1-11.ACCESSORIES
1-12. Many accessories for the Studio/Master 505S are
available from Russco Electronics. Included are
monitor speakers and headphones, microphones and
stands, remote start relays and headphone jack
boxes .
1-13. Russco studio turntables are available finished to
match the Studio/Master 505S .
109-011

www.SteamPoweredRadio.Com
Studio/Master 505S/SOSSR
Section I
Table 1-1. Specifications
Inputs: 9 Total Stereo
Channels 1- 4 (Preamps, Unbalanced Stereo)
Sensitivity.,.,.
Max Input
Impedance
Hi Level
-lOdBm
+14dBm
47K
Microphone
70
'1'
l.OOmv
13mv
47K
Channel 5 (Balanced,5 Stereo Inputs, Switched)
,\-Sensitivity:
Max Input:
Impedance:
Outputs:
- l OdBm
+18dBm
600 ohms
Monitor:
(External Package, Opt i onal)
lOmv
lOOmv
47K
Power: 25 Watts Average p er Channel (14. 14 volts RMS across
8 ohm load at lKHz)
Impedance: 8 ohms
Total Harmonic Distortion: Less than 1% at full rated output
Program:
(Stereo)
Level: +4 or +8dBm, for OVU, +17dBrn maximum
Impedance: 600 ohms
Frequency Response: 20 to 15 KHz, + ldB
Total Harmonic Distortion: Less than 0.5% at lKHz, +8dBrn out.
Noise: Greater than 60db below +4dBm output referenced to
-50dBm input.
Headphones:
(Stereo)
Level: OdBm
Impedance: Hi down to 8 ohms
Cue: (Mono,
both channe l s mixed)
Power: 1 watt average
Speaker! 8 ohms, 3 inch
On-Air Light (Relay Driver)
Voltage:
-24 VDC
Current:
40ma (600 ohm coil)
*Mixer Pot at 1:30 o ' clock position, OVU out.
**Referenced to low impedance microphone source
,~-Jo'l'At lKHz.
109-011
1-3

www.SteamPoweredRadio.Com
Studio/Master 505S/505SR
Section I
1
-4
Table 1- 2. General Informat i on
Controls:
*Input mixing - 5 each, Stereo Ganged, with Cue;
*Monitor level - 1 each, Stereo Ganged, with power switch,
on front panel.
Master Level (2) }
Gue
level Trim pot on main P.C. Board
Headphone level(2)
10
',0n-Air key switches (Channel 1-4) -4 each, push - button,
alternate latching, SPDT.
Input se l ector switches (Channe l 5) - Push-button,
interlocked, Sx 4PDT.
P.C. Boards: (Seven Total)
Main Board
Four Preamp Boards (plug-in)
Pot Board - Mixing busses and booster amp.
Hi Level Board - Hi level input switch, Power i nd icator and
VU meter leads.
P.C . Interconnections:
Flat Cable and Multi-pin p lu gs .
Audio Switching:
DC Controlled field-effect transistor switches on Channel 1- 4.
Push button switch on Channel 5.
Audio Mute:
DC controlled FET switch.
Size:
Rack Mount - 8
11
deep x 5 1/ 4" high x 19" wide , ( 20. 32x 13. 34 x48. 26CM),
Desk Mount - 8
11
x 5 1/ 2" x 20 1/ 4 ", ( 20. 32x l3. 97x51. 44CM) ,
Weig
ht:
14 pounds (6.35 KG)
Power Requirements:
117 VAC, 60 Hz , 100 watts
*Allen-Bradley MOD POT, Hot-molded element, rated at 10 0,000
rotations.
**Graybill series 46, rated at 250,000 operations.
109-01 1

www.SteamPoweredRadio.Com
Studio/Master 505S/505SR
SECTION II
INSTALLATION
2-
1. UNPACKING
2- 2. Remove packing material and lift the console out
of the box.
2-3. Save all packing material shou ld it be necessary
to ship the console again.
2-4. MOUNTING
2-5. Rack mount model panel mounts to rack with four
standard rack screws. Vertical space required is
5 1/4 " . Be sure the rear apron of the chassis is
open for ventilation . The 505SR should not be
mounted near any high temperature equipment. Ambien t
temperature should be no higher than 55 °C (131°F) .
2-6. Desk mount model can be set on any level surface.
The friction of the rubber feet on the desk surface
should prevent any movement of the unit.
2-7. To anchor the console to the surface, proceed as
follows:
a. Drill holes (5/32") in the table top at the
points where the rubber feet sit.
b. Remove the screws from the rubber feet and
remove the feet.
c. Insert 6-32 screws up through the holes in the
table top. (Screws should project 1/2
11
to 5/8"
above the table).
d. Place the feet over the screws ,
e. Run screws into the bottom of the ch a s sis .
2-8. INPUT ASSIGNMENTS
2-9. Before connecting the input lines, the input
configuration should be planned. The flexibility of
the Studio/Master 505S allows a variety of con-
figurations. The factory has pre-set the consol e
for one configuration.
2-10. Figure 2- 1 illustrates a typical input configuration,
using the factory settings.
2-11. Table 2 -1 lists the factory settings of the various
jumpers options.
2-12. The input confirguration can be changed by movin g
jumpers as described in 3-1.
109 -01 1
Section II
2 -1