M497C — Dual Master Module

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M49ZC DUAL MASTER MODULE The M497C accommodates two separate signal channels It is designed to receive the mixed feeds from the left and right mixcr buses console The two signals are independently processed and amplified standard line levels: The outputs of the M497C supply the main program outputs the consolc system Both channels operate similar manner. The following description refers specifically t0 thc LEFT channel, loss the input network and provides additional gain produce nominal line level of +8 dBm the output the module: ohm resistive dividing network inserted between the 8-109E and the IWo module outputs pins 12/N and [3/P Each of the two outputs has maximum drive capability 0f +24 dBm into bridging load_ Input A separate MONITOR output is provided_ designed feed the M495 STEREO MONITOR module as well as t0 drive standard VU meter The signal originating from the external mixing network enters the module pins 1/A and is applied to the summing current nodes of ZI and Z2.

ZI through 23 with their associated components, providean actively balanced input well balanced output: The output operates at nominal level of 0 dBm and appears at pins 6/F Right ChanncLand MONQ Qutput The right channel of the M497 operates manner similar [0 the left channel a5 described above: For the MONO output, both channels are combined and appcar at pins M/M The signal Icvcl of this output i5 such that; when connected the summing input of second M497, it will produce output of +8 dBm, with the left right channel of the first unit operating at +8 dBm_ Inscrt balanced INSERT point is provided between pins 6/F and 8/J_ permitting the insertion external cqualizer_ filter compressor_ either using M499 insert switcher Or by direct wiring: Level_Adjustment Power_Supply_Decoupling From the INSERT point; thc signal returned the module at pins 8/J and fed the 8-109E output amplifier via attenuator network: R42 level trim potentiometer permitting adjustment the module output level: small hole in thc module front panel allows access t0 the trim control.

An active power supply decoupling network consisting of Q1 through provides isolation between the module and the +/-25 volt supply rails: Tran sistors Q3 and Q6 monitor the supply current: In the event of excessive power supply demands, such as from component failure or amplifier overdrive, the cur- rcnt flowing through QI and Q4 will be limited. Qutline Thc 8-109E output amplifier operates with gain dB.

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M49zC_DUAL MASTER MQDULE PART DESCRPTION MEG MFG PARTNUMBER R4[ R42 R43 R44 R45 Resistor /4w 500 Trim Pot Resistor /4w 596 Trim Pot Resistor {4w 500 Philips Piher Philips Piher Philips CR2S PTIOH SK CR2S PTIOH SK CR2S 0 8 36k 36K 36K 30 8 R46 R47 R4s RSO R5] R52 RS3 R54 RSS R56 R57 Rsg R6o R6 ] R62 R63 R64 R65 delete Resistor 1/4W 590 SK ISK 470K Philips CR2S R66 R67 R68 R69 R70 2K2 2K2 8 3.3 390 390 SOT SOT R7] R72 R73 R74 R75 R76 R77 R78 R79 15 15 ZI To 26 Integrated Circuit National LM3OIAN WBS recommends the usc of replacement parts made by the specified manufacturers for continued optimum equipment performance: 3-3

M49ZC_DUAL MASTER MODULE PART DESCRIPIION MFG MEG PART NUMBER Capacitor 4.7 4F/iO 330 uF/6 330 UF/6 330 uF/6 47 pF Kemet T39OB47SMOIOAS Philips 2222-638-70479 C6 47 pF 100 100 0 12 150 150 0 47 100 pF 100 1 0 33 uF/10 33 uF/10 33 uF/10 22 4/38 4F/25 uF/25 1 4 uF/25 2200 pF 2200 pF SOT SOT 2222-638-70101 2222-638-10129 2222-638-70151 2222-638-70479 2222-638-70101 2222-638-10129 Cz0 Kemet T390D336MOIOAS Philips 426ETF22 Aselco cQ92-MC-222M Diode Motorola IN4003 CRZ CR3 CR4 Transistor Texas National TIP29B PN3569 Texas National TIP3OB PN3645 3-]