M470 — Input Module

Input Channels The M471C Stereo Input Module has been designed replace the M470 series mono input module used in WBS "L Series Audio Consoles has been determined that the opt imum replacement kit size should configured for the replacement four (4) mono input channels with Tike number stereo channels The WBS K2042s/ Modification Kit the basic package for this modification and provides the components necessary convert four mono input channels stereo operation.

The K20425/1 provides four M471C input modules four stereo balanced conductive plastic faders, and the installation wiring harness required . When the kit installed, the two channe] MIC input circuits are util zed for the LINE Tevel stereo input The exsist ing mono INE input circuit not used and disconnected 1S necessary utilize the second ("B" LINE input the M471C module, addi- tional input wiring required either from exsisting terminal block from an added block.

The M471C provides input SENSITIVITY range from -10 dBm +10 dBm , with input impedance of 30,000 Ohms When stereo input modu les are installed standard "L" series console, the insert jacks associated with the channel being modified are removed from the circuit Bus ass ignments from the M471C modules are identica] those the M470 series with ass ignment pushbutton switches for S1 , 52 53 , 54 _ M1 _ and M2 When the series console used for stereo audio production, submaster channels and S2 are used for LEFT and RIGHT respect ively Likewise 53 and and Ml and become the LEFT and RIGHT channe]s Therefore the M471c module configured that the internal LEFT Channel the source for the odd numbered assign - ment switches S1 , 53 , Ml) , while the internal RIGHT channel the source for the even numbered ass ignment switches (52 , S4 , & M2) The four AUXILIARY bus feeds the M471C module are mixed (LEFT RIGHT) mono signa] = L2042/13242 consoles only utilize two the M471C AUX circuits while L20424/132424 consoles utilize al four

The L2o42 and L3242 series WBS audio consoles including custom des igned series consoles may enhanced for stereo operation with series of retrofit kits These kits provide for the modifi cation series console add stereo input modules stereo equalizers and stereo monitor channels The modifications are des gned implemented on-site instal ation necessary wir ing harnesses by Ioca] stat personnel Opt ionally, installation assistance can provided WBS_ required t Tme travel and subs stance basis The input channel modification consists replacing number mono input channel modules (M470 , M470A , M47OB , M47oc) and the corres ponding mono fader units with stereo input channel modules (M471C) and stereo faders The kit available provides for this modification imp emented into group four input channe time Four eight twe channels could thus revised within sing] console using one two, three the kits second kit permits the replacement the mono channel equa] - izers with simi stereo units again implemented group four channels Multiple kits May also utilized similar manner the input channels Console monitoring covered third kit While it possible use two exsisting mono monitor channe)s tandem for stereo moni toring this pract ice may operat ionally awkward The monitor modif cation consists replacing the three (or four) consoie monitor modules with simi stereo units thus providing stereo ource selection switching and stereo Tevei control Mixing bus structure for the console remains unchanged However operat ionally for stereo console use the subma ter buses are used pairs (1.e.

for LEFT S2 for RIGHT) and similarly the master buses are a]so used in pairs imi for LEFT M2 for RIGHT)

MFG: CLAROSTAT CONF IGURATION: SINGLE ELEMENT MFG P/N: 388 SERIES TYPE: CONDUCTIVE PLASTIC RESISTANCE{TAPER: 7k5 OHM ROTATION: 2950 1 5% L) n<an POWER RATING: RZ (B) TAPER TORQUE: To 6 0z IN 1/2 WATT HARDWARE: LOCKWASHER Nut (STANDARD) USED ON: M470 SERIES S6_^~5 716< ~SAD 440 2.36 9iA10-824 - 815 L.8] .380

STEREO MODIFICATION KiT #K20425/1 CAUT (ON AII wiring removed in steps through should be carefully tied back prevent Toose wiring From shorting when the input tray reinstalled 19) Lay cable assembly 5A91-036 Into position and secure, using nylon cable ties existing cables Ensure that new cable wil not interfere with reinstallation connector tray 20) Solder wires from cab le assembly P2-5,E ,P2-7,H(4 ) and P2-8,J(4) .

P2-2,B (4) , P2-3,c(D); 21 } Solder chassis ground wire from cable assemib connector being modified onto pin P2-22 the fourth 22) stereo equalization modification kit #K2042s/2 als0 be installed, obtain cabie assembly 5A9I-037 from that kit: Lay assembly 5A9I-037 into position and secure, using nylon cable ties existing cables Solder wires from cable assembly PJ-21,Y(P2-20) the input rodule connectors Section this manua outlines the installation kit #K20425/2 .

recommended read this section now obtain an overview thal procedure kit #K20425/2 not Installed then the M471C connectors wil require bypass jumpers installed between P1-22 and PI-Z, and P1-21 and PI-Y - 23 ) The shield ground for the four Tnput channels being .modified must be jumpered from their cespective inputs TB the shield ground TB2 For examp channels 17 20 are being modified; then TBI-99 105 , 111, 117 should be jumpered TB2-51_ 54, 57 60 _ 24) Reinstall input connecter tray by performing the reverse steps 10 thraugh 14 .

25 } Install new tereo faders 5A91-034 by first inserting the inline connector offered on the 5A91 036 cable assemb Secure faders the console using mounting screws removed from mono Taders 26 ) . Install new M471c Stereo Input Modules and secure them using mounting screws removed from M470 series input modules: 27) Reapply power the console 2-3