dbx 463X Technical & Service Manual Download | Manualshive

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Summary of Contents for 463X

Page 1: ...Preliminary Technical Service Manual MODEL 463X OverEasy Noise Gate Expander dbx Professional Products ...

Page 2: ... 4 329 598 4 403 199 4 409 500 4 425 551 4 473 795 Other patents pending This dbx branded product has been manufactured by AKG Acoustics Inc 1991 AKG Acoustics Inc dbx Professional Products a division of AKG Acoustics Inc 1525 Alvarado Street San Leandro CA 94577 USA Telephone 1 415 351 3500 Fax 1 415 351 0500 ...

Page 3: ...evel For the performer there s a high impedance input jack on the front as well Plug in connect the 463X to the amp or board and you re on your way The Hi Z input defeats the rear input and has its own trim for a wide range of instrument pickup levels Finally there s a Key input for special applications like frequency sensitive gating Two 463Xes become a master slave stereo pair of noise gates at ...

Page 4: ...ogram and slider dependent Release time 10 500 ms program and slider dependent Power requirements 100 120 220 240 V ac switchable 50 60 Hz 7 W Notes 1 Specifications are subject to change 2 Ail voltages are rms root mean square 3 0 dBv is defined as 0 775 V regardless of load Impedance Subtract 2 2 from the dBv figure to convert to dBV i e referred to 1 V When the load impedance is 600 ohms this p...

Page 5: ...ard out and send it to us The carton also should con tain hardware for rack mounting both a single unit screws a long half rack width ear a small L bracket and a short rack ear and two units together side plates along with a screwdriven joiner See below No special ventilation is required in any installation other components may be stacked above or below the unit provided they don t generate excess...

Page 6: ...rred to 1 V When the load impedance is 600 ohms this particular dBv is also known as dBm 4 Noise figures are for 20 Hz 20 kHz 5 Attack time is the time required to restore the signal to 63 of the input level after it has gone above the OverEasy threshold release time is the time required for the signal to be reduced to 63 of its final gated level 20 Hz 20 kHz 1 dB 0 2 unity gain 85 dBv unweighted ...

Page 7: ...same thing a stereo pair of noise gates provided this first unit remains the Master But if you connect it to a 163X and press the button in to Slave this unit becomes a 163X and you have a true stereo pair of 163X compressor limiters Neat huh The jack is a 1 4 3 circuit stereo phone type tip ring sleeve use 3 circuit plugs and cables only for anything else won t work Of course be sure to disconnec...

Page 8: ...s the level below which a signal is attenuated Set fully clockwise 10 and the signal will begin to be pushed down even when it s still loud Turn the knob counterclockwise and the signal is not gated until it has dropped to a low level on its own At full ccw the gate is inactivated and the 463X effectively bypassed Ideally the knob should be set such that only wanted signal is above the threshold a...

Page 9: ...ry see text ZD TO 463X INPUT Balanced Outputs and the 463X Line Input Single Conductor Shielded Cable To take advantage of the balancing capability provided by the balanced inputs the following connection may be used when the 463X output is connected to a device with balanced inputs T S csz FROM 463X OUTPUT ONLY IF NECESSARY SEE TEXT S R T ZED TO BALANCED INPUT Balanced Inputs and the 463X Line Ou...

Page 10: ...rum want more severe deeper and faster gating with settings toward the right Since hearing the point where gating begins is easier than seeing it with the Threshold LED zero in on exactly the sound you re going for by fine tuning the Threshold knob There are no typical settings because an exact one necessarily depends on widely varying levels and program material The Hi Z trim This screwdriver tri...

Page 11: ... t fail to disconnect the units from ac power when hooking up a stereo pair you ll avoid a potentially loud and damaging pop Also see the assembly drawing at the bottom of the inside front cover After you ve decided which unit is the Slave by pressing in the rear button the yel low LED on the front will light As explained earlier the front controls are inactivated will have no effect and the LED b...

Page 12: ...ained with the slider in mid position High ratios heavy attenuation and faster release rates result of course from settings farther to the right MORE Below are the explanatory circuit action illustrations accompanying your unit APPLICATIONS Noise reduction As we ve said the basic purpose of a noise gate is to remove unwanted background sounds in the spaces between desired foreground sounds But not...

Page 13: ...oisy feeds land lines ENG audio if it s placed at the output Wind or air conditioning noise during a remote interview can be controlled as well proper attenua tion can keep noise during pauses from being either loud obtrusive sounding or too soft peculiar sounding or modulated Hum Instruments with magnetic pickups like a bass guitar often exhibit some buzz or hum between notes which may be aggrava...

Page 14: ...ve gating You can also do frequency sensitive gating which lets you tune the response of the gating action This is especially useful when gating signals that are nearly buried in noise If for example you re gating a kick drum in a track with lots of leakage you can tune in to the frequency of the kick with an EQ and the gate will respond only to the drum See below 463X OUTPUT NOTES FILTER TUNED TO...

Page 15: ......

Page 16: ...rrent at pin 1 to the output current pin 8 Is controlled by the voltage applied to pins 2 and 4 Positive voltages here produce attenuation and negative voltages produce gain The actual scaling Is 6mV per dB If for example the voltage applied to pins 2 and 4 Is 36mV then the current gain will be 6dB and the output current will be half as big as the Input current Since the output signal at pin 8 is ...

Page 17: ...brated exactly via R25 For example with the scaling of 6mV dB the onEri J olta e at TP6 111 be 120mV when the Input level is 10dBv f b V eve J match and will be 120mV when the Input level Is 30dBv 20dB below level match The RMS symmetry Is adjusted by R31 and Is uri b inn e H S ef h tha a Input signal the ripple component Is a pure 100 Hz sine wave at about 70mV p p at TP11 speed at which output o...

Page 18: ...pin 1 of 0A4A described above The plus Input comes from 0A5B which subtracts out the temperature compensating voltage that was added In at 0A4A This voltage Is normally about 300mV but gets pushed to 7 5 V when the Slave switch Is activated This Insures that the LED will be off during Slave operation Attenuation Limit Circuit When the voltage at TP4 Is less than about lOOmV 0A4B acts as an n f rte...

Page 19: ...he comparator section becomes an open circuit and allows the current to flow through the LED connected to that section turning It on All LEDs above this point will be on and all LEDs below this point will be off When the Slave switch Is pressed this current Is sent to the Slave LED turning It on and the entire string off Power Supply The voltage selector switch located on the rear panel connects t...

Page 20: ...et and let it warm up for at least 10 minutes before making any adjustments 3 Disassembly Be sure the 463X Is disconnected from any ac outlet Refer to the exploded mechanical view and locate the four corner rear panel screws Remove only these corner screws and slide out the rear panel about 4 Inches Carefully disconnect the transformer secondary cables from the main PCB by sliding apart at the con...

Page 21: ...ont panel Is lit 3 With the oscilloscope connected to the rear panel Output jack adjust Rii for minimum ac content in the waveform The peak to peak amplitude should be less than 5mV See figures 3 4 4 Remove connection from Strapping jack and return Slave switch to the normal out position D HI 2 Gain Trim l Set oscillator for 1kHz at 20dBv and connect to the front panel Hi 2 Input jack with a stand...

Page 22: ...r line on the More control must be between the 20 and 25 DE LEDs 5 Verify that the rightmost 6 DE LEDs are lit 1 LED 6 Set MORE control full left 7 Verify all DE LEDs now off G Noise Check 1 Remove any connections from the Input jacks 2 Set the More slider fully left and the Threshold control CCW 3 Connect ac voltmeter to the rear panel Output jack and verify that the noise level Is less than 80dB...

Page 23: ... suitable distortion analyzer spectrum analyzer or THD meter connected to the rear panel Output jack verify that THD Is less than 0 08 4 Set the Threshold control CW and adjust the More control so that the first two DE LEDs turn on 4 Repeat steps 3 and 4 for 40Hz THD should be less than 0 251 5 Repeat steps 3 and 4 for 10kHz THD should be less than 0 1 PRD7Er V CAIISRATI RMS WAVETv V ...

Page 24: ...IO I R 7 12 RIO 2I 43 70 T5 i 3 Rll M R 2 I 5 R 3 45 IG RI4 R 15 23 IB RIG 17 9 9 RIB 25 31 RI9 PL BG054G POT TRIM SO K RESISTOR 2 K 2 SK ORG IOOK 50K N ST GAIN lW POT RESISTOR 49R9 VCA YM 4W 054102 054394 0544 7 Z 070Z74 5 0342 2 2 054 I 6 3 1 0 6069 034 I 0 4 itf I 014999 5 034 3G2L O 2do 2_ 57i 054 203 034 223 ROT TRIM 50 K RESISTOR 470K offset 0 447 4 ...

Page 25: ... 34 W39 35 R42 36 R46 37 R52 5 V54 55 5G 38 R57 5 39 40 RGO RESISTOR 47 K IOK GRB 62K zzk 22M 560K 2M 22 0 8M2 4K99 POT VERT MOUNT 50K RESISTOR 3Q9K H IOK f r A 82K l KG PART NUMBER 0 5 447 3 054 l 03 054 I O I 054689 0546Z3 054 2 2 3 054 26 OS4564 054 205 05 4 2 01 054 82 014 99 I Ol 3093 O 1 1 00 2 5 054 62 3 054 162 054 3 3 2 r 1 1 ...

Page 26: ...9 R 4 R 72 74 R44 R 71 RESISTOR I K5 RESISTOR 47 RESISTOR iook RESISTOR 49 K9 RESISTOR 8K2 RESISTOR MS lW S VaW An 4W Se l 5 l 1 5 034 6 9 0 11 16 19 20 21 22 CZ3 24 25 20 27 CAPACITOR 12 QP CD V5E Q IOON MV MIN gQV 5 ION CD Z5U zoy 054 I S2 oS4 4 7 o Cl I OO 3 014992 054 622 054 G 5 CGJ 3S GO CI2 I0 PL 3GO54G CAPACITOR 3u 3 5QV Rad el 20 1 IQQP CD NPO 500V 10 CAPACITOR 330N MY MINI 5CV 0 1 27 IC ...

Page 27: ... 4 5 OAl OA2 80 PL 360 54 PART NUMBER QTY DESCRIPTION CAPACITOR IC 5DV RAD EL Z 72 02 IN CD V5E EOQV 10 2 4 52 11 C8N CD NFO 11 470 35V PAD EL tfg I 27 90 127084 CAPACITOR ZOOP CD F IOOV ilCT ol Z 306 1C RMS PC I253HZ 1C VCA PC1Z52H2 IC LM33 N 14 74 2 1467 S 2 4 2 71 OP AMP OP AMP OP AMP L F355N NE5534N RC4558P 14624 I 146281 MGogi ...

Page 28: ...ION CR I 2 CR 3 4 5 G 7 2G3 27 30 31 CRB9 DESCRIPTION DIODE ZENER IV 1N4M PART NUMBER 14000 4 003 t CR 2 I ZZ 4 5 24 VRl VR2 IOO PL 3 30344 DIODE N4003 I 4O0Z2 TRANSISTOR PNP SILICON SA 3 53l A 2 14 3 VOLTAGE REGULATOR 7815 l V 1 46366 VOLTAGE REGULATOR 7 915 5V mi SWITCH 4 PDT ...

Page 29: ...l J2 5 1 12 Yl Y33 3 rp 2 TRANSFORMER CONN HOUSING F EM M_E 3 PI N TERMINAL CRIMP couu MM e 3PIW rnght angle PHONE JACK PHONE JACK SHIELDED CABLE CONDUCTOR JUMPER ERO OHM TEST POINT PINS nooss 33 LED BOARD ASSY SPACER SCREW PAN HD X REC WASHER I NT TOOTH TIE WRAP 4 0564 PL 300540 I ITEM 106 S PART OF MA N ASSY U ...

Page 30: ...57 CONNECTED TO MAIN GROUND AT ONLY ONE POINT 6 fTSv DENOTES VOLTAGES ARE TIED TOGETHER AND LLJ CONNECTED TO SUPPLY VOLTAGE AT ONLY ONE POINT 9 n DENOTES VOLTAGES ARE TIED TOGETHER AND hVn CONNECTED TO SUPPLY VOLTAGE AT ONLY ONE POINT 10 ALL SWITCHES ARE SHOWN IN THE OUT POSITION 11 REFERENCE LED BOARD PARTS LIST NO PL360564 1 CD Ho I J52 j UJ OKU X x o c o r m u xx v o MAW X m DO 3 M O u 3 oo o X...

Page 31: ...R7I ...

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