1650 ACTIVE EQUMJZER OPERATING INSTRUCTIONS
Contents
1. OPERATION The ALTEC 1650 Active Equalizer is an Acousta Voicing filter set equipped with 28 active band rejection filters and addi tional high low pass filter selection to accurately equalize the entire audio spectrum of one sound system channel Internal gain correction equalized output to the original input level Controls and Indicators All normal operating controls and the pilot indicator are located on the front panel Control functions are described in Table A hinged control cover prevents inadvertent control changes When the hinged cover is secured only the POWER switch pilot indicator is exposed The filter controls are continuously variable slide potentiometers detented in increments of 1 dB ALTEC recom mends that the detented positions be used so that precision resetting of the controls can be guaranteed A con venient method of recording filter control settings for future resetting of controls for different installations or applications is shown in Figure 1 After setting the filter controls for the best frequency response over the sound spectrum adjust the GAIN control to pro vide an equalized output level as high as the unequalized input level The GAIN control is detented in increments of 2 dB and has a reinsertion range of 20 dB The exclusive ALTEC Acousta Voicina process is patented under Pat No 3 624 298 SOUND PRODUCTS DIVISION restores the m Control 1650 ACTIVE2. 112 130 C36 15 06 121364 01 Cap 0 56 uF x 295 100V 131 C37 53 15 06 121363 01 Cap 0 4 uF 2 100V R113 134 47 01 102040 01 Res 272 5 VW C38 15 06 121383 01 Cap 680 pF 2 100V __ 139 140 C40 15 06 121384 01 Cap 0 0027 uF 2 100V 141 150 C41 44 45 15 06 112120 01 Cap 47 uF 25V R115 47 01 102108 01 Res 18 KO 5 VaW C43 15 01 112804 01 Cap 470 uF 25V R116 47 01 102064 01 Res 2702 5 VW C46 47 48 15 01 114213 01 Cap 470 uF 40V R117 47 01 102090 01 Res 3 3 KQ 5 YW 49 R118 47 03 121330 01 Res 1 91 KQ 1 VW C50 51 52 15 02 100307 01 Cap 0 01 pF 20 100V R119 121 47 03 119016 01 Res 3 83 Ka 1 VW 54 55 R122 123 47 03 121329 01 Res 3 16 KO 11 VAW CR2 3 4 5 6 48 01 100881 02 Diode stabistor STB 567 124 CR7 8 9 10 48 02 042787 01 Rect silicon 1A 400 PIV R127 128 47 01 109092 01 Res 3 9 KR 15 VW 11 12 13 1N4004 R129 132 47 01 102232 01 Res 47Q 5 V2W F1 51 04 100463 01 Fuse Y ampere 3AG 250V R133 47 01 102208 01 Res 4 72 5 VeW Q3 5 7 9 11 48 03 121306 01 Transistor 2N3904 R135 47 01 102056 01 Res 1202 5 VW Q4 6 8 10 12 48 03 107102 01 Transistor 2N3906 R136 137 47 01 102131 01 Res 150 KO 5 VAW Q13 48 03 107447 03 Transistor 2N5320 selected 138 Q14 48 03 121251 01 Transistor FET MPF 4393 R151 47 01 102262 01 Res 8209 5 YW R1 47 01 102259 01 Res 6202 4595 Y2W U1 2 3 4 5 17 01 121305 01 Int ckt op amp
3. EQUALIZER OPERATING INSTRUCTIONS Table 1 Operating Controls and Features ec A Filter Controls POWER OFF ON Switch LOW PASS Filter Control HIGH PASS Filter Control BYPASS OUT IN Switch 1515 S Manchester Ave Anaheim Calif 92803 Rate ci ond eg ner in Nar am H A UU VESS MEUM AT TS Kv meom A OOTA TOA L ott Adjust V2 octave band rejection filters Twenty eight linear continuously variable slide controls graduated from 0 to 15 dB detented in increments of 1 dB ISO center fre quencies range from 31 5 to 16 000 Hz Filter depth is 15 dB on each center frequency combining with adjacent filters at 7 dB Adjusts output level of equalized program to match input level of unequalized program Maximum available gain is 20 dB Applies primary ac power when depressed to ON position Pilot light in switch illuminates when power is on Adjusts low pass filter to shape high frequency portion of audio spectrum Continuously variable slide control graduated from 5 to 20 kHz Rolloff is 18 dB octave at the selected corner frequency Adjusts high pass filter to shape low frequency portion of audio spectrum Continuously variable slide control graduated from 20 to 160 Hz Rolloff is 18 dB octave at the selected corner frequency Enables the 1650 to be conveniently switched in and out of the sound system channel Useful for A B comparison Slide type sw
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5. 0 Volt 50 60 Hz Power Connections Export equipment specified is provided with the power transformer primary strapped for 240 volts The voltage rating nameplate on the rear of the chassis above the power cord see illustration of Table ll is mounted to show the appro priate side specifying the connections If the 1650 is to be powered from a 240 volt 50 60 Hz line proceed as follows to change factory wiring of the primary power circuit from 120 volts to 240 volts KHZ 5 8 125 20 OFF LOW PASS Figure 1 Control Settings Record 1 Remove seven screws securing top cover lift off cover former T102 see Figure 2 Table ll Rear Pane Controls and Functions Mn Wurm wr AT d n rs Mem Name Function Description INPUT ACC receptacle LEVEL dBm Switch ALTEC MODE 1650 Ta me ot ciowinmnm desa aunune MEA van Arte cuteur r0 cesa Accepts appropriate plug in accessory to accommodate input circuitry for desired application Accessories include 15356A Matching Transformer 15335A Transformer and the 8080B Pink Noise Generator Selects either 1 or 21 dBm operating mode of 1650 in accordance with input program material INPUT terminal Connects 1650 to 150 ohm or 600 ohm source board 4 OUTPUT Connects 1650 to 150 ohm or 600 ohm load terminal board 24 28V BATT Connects external battery power supply for auxiliary opera terminal board tion or standby swit
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7. 2 yF 2 100V R10 47 01 102059 01 Res 1602 5 Ya W C12 15 06 121356 01 Cap 0 08 uF x 296 100V R11 47 01 102070 01 Res 4702 5 14W C13 15 06 121352 01 Cap 0 0315 uF 225 100V R12 13 18 47 01 102072 01 Res 5609 5 V4W C14 15 06 121348 01 Cap 0 0125 uF 2 100V 33 C15 15 06 121344 01 Cap 0 005 pF 3 295 100V R14 19 25 26 47 01 102073 01 Res 6202 5 YW C16 15 06 121340 01 Cap 0 002 uF 2 100V R15 16 21 47 01 102074 01 Res 6809 5 Ya W C17 15 06 121389 01 Cap 0 4 uF 2 100V 22 28 29 C18 15 06 121359 01 Cap 0 16 uF 2 100V 30 35 36 C19 15 06 121355 01 Cap 0 063 uF 2 100V 37 C20 15 06 121351 01 Cap 0 025 pF 2 100V R17 47 01 102062 01 Res 2202 5 4W C21 15 06 121347 01 Cap 0 01 pF 2 100V R20 47 01 102071 01 Res 5109 5 AW C22 15 06 121343 01 Cap 0 004 uF x 295 100V R23 47 01 102075 01 Res 7502 5 VW C23 39 15 06 121339 01 Cap 0 0016 uF 2 100V R24 27 31 47 01 102069 01 Res 4302 3 526 VW C24 15 06 121362 01 Cap 0 315 uF 2 100V 34 C25 15 06 121358 01 Cap 0 125 pF 2 100V R40 thru 47 05 108937 02 Pot 22 K2 2096 WW C26 15 06 121354 01 Cap 0 05 uF 2 100V 67 C27 15 06 121350 01 Cap 0 02 pF 2 100V R68 69 101 47 01 102030 01 Res 109 5 VW C28 15 06 121346 01 Cap 0 0063 pF 3 296 100V 102 106 C29 15 06 121342 01 Cap 0 00315 uF 275 100V 107 111 C30 15 06 121338 01 Cap 0 00125 uF 2 100V
8. Connec tions should be made with two conductor twisted and shielded cable such as Belden 8450 or 8451 cable 150 Ohm and 600 Ohm Input Connections As shipped from the factory the 1650 is strapped for direct unbalanced input at the INPUT ACC receptacle at the rear of the chassis pins 1 and 7 For 600 ohm unbalanced input applica tions with the 1650 connect signal source to terminals 1 and 4 of TB101 and strap terminals 4 and 5 see Figure 3A For balanced operation the strap must be removed from the INPUT ACC receptacle and replaced by the 15356A Line Match ing Transformer accessory see Table II For 600 ohm balanced input applications with the 1650 connect signal source to terminals 1 and 4 of TB101 and strap terminals 2 and 3 see Figure 3B Con nect the shield to chassis ground eat terminal 5 For 150 ohm balanced input applications with the 1650 connect signal source to terminals 1 and 4 of TB101 strap terminals 1 and 2 and strap terminals 3 and 4 see Figure 3C Connect the shield to chassis ground at terminal 5 INPUT signal Source A 600 Ohm Unbalanced Input N signat Source B 600 Ohm Balanced Input INPUT Signal Source C 150 Ohm Balanced Input Figure 3 Input Connections at TB101 15 000 Ohm Input Connections For 15 000 ohm balanced input applica tions with the 1650 connect the signal source to terminals 1 and 4 of TB101 see Figure 4 Connect the shield to cha
9. aas HOION
10. chover Chassis negative ground Protects against excessive current drain from line power source Replace with same type 1 8A slo blo fuse see Parts List Protects against excessive current drain from external battery Replace with same type 1 2A fuse see Parts List ac 50 60 Hz or 240V ac 50 60 Hz Plate reversible in event of field modification 2 Locate terminal board TB103 on the rear panel of the chassis behind trans wii Figure 2 Converting to 240V 50 60 Hz Power 3 Remove strap A connecting terminals 1 and 2 and remove strap B con necting terminals 3 and 4 then solder strap C to terminals 2 and 3 as indi cated in Figure 2 4 Remove voltage rating plate from chassis reverse and reinstall to show 240V rating 5 Install bottom cover on chassis using seven screws previously removed Battery Connections If desired the 1650 may be connected to an external 24 28V battery with minus as ground Terminals for the dc power connections are on TB104 see Table Il If ac power fails transfer to dc power is instantaneous automatic and silent The battery power supply is not operated by the POWER OFF ON switch at the front panel of the 1650 If switching of battery power is desired an external relay or switch should be provided by the user Input Connections Input connections to the 1650 are made at the INPUT terminal board TB101 at the rear of the chassis see Table ll
11. ilter circuit board at base of connector carefully rock panel assembly end to end to disconnect 80 terminal connector Front panel assembly may now be removed from chassis to extent per mitted by wiring T102 Filter Trim Potentiomerers R40 thru R67 Power Supply Fuse F1 TB103 pdt L3 L2 Table Ill Notch Filter Check Points and Adjustments 4 12 KQ Check Point J1 Side Notch Frequency Alignment Potentiometer Control Circuir Board Assembly Filter Circult Board Assembly T103 L1 C10 Figure 5 Internal View of 1650 Active Equalizer 6 Remove two screws at lower corners of filter control board to free board from standoffs Remove four screws along top of panel and two screws located directly above the BYPASS and POWER switches 7 The filter circuit board assembly may now be separated from the front panel If R1 R14 R22 or R29 is to be replaced the corresponding mounting brackets must be removed from the potentiometer housing B When service is completed install circuit board by reversal of removal procedure Filter PCB Assembly 1 Remove seven screws securing top cover and seven screws securing bottom cover lift off covers 2 Most components are accessible for service If greater access is required free front panel from chassis by com pleting steps 1 through 5 of Control PCB Assembly procedure 3 Seven screws secure the filter PCB assembly to chassis bracke
12. itch inserts the 1650 into the sound system channel when moved to the OUT position Copyright 1976 Altec Corporation Specifieationg and compuntnds subject to change Without notice Overall performance acil be mutiimiuced or improved LITHO IN U S A 378 2 5M CIRCLE SETTING FOR EACH CONTROL OFF 20 40 80 V30CTAVE CENTER FREQUENCY HZ 160 HZ HIGH PASS INSTALLATION Rack Mounting The 1650 may be mounted in a standard 19 inch equipment rack or installed in the 42625 or 42526 Cover Accessory with other ALTEC equipment Vertical space required for mounting is 5 Remove four screws securing the front cover open and lower cover Install the 1650 in the equipment rack using the appropriate four screws supplied Close the front cover and secure with the four screws previously removed Ventilation lf the 1650 is mounted in an equipment rack or cabinet with heat producing equip ment be sure that environmental operating temperature does not exceed 55 C 131 F 120 Volt 50 60 Hz Power Connections Equipment supplied for domestic use is provided with the power transformer primary strapped for 120 volts The voltage rating nameplate on the rear of the chassis above the power cord see illustration of Table Il is mounted to show the appropriate side specifying the connections Verify that line voltage is in accordance with the voltage rating before connecting the 1650 to line power 24
13. oke inductor assembly T103 56 07 016810 01 Transformer output TB101 102 21 04 121378 01 Terminal board 5 terminal TB104 21 04 121377 01 Terminal board 2 terminal CONTROL PCB ASSEMBLY Reference Ordering Name and Description Designator Number Name and Description Pot 5 Ko K taper R30 47 06 121300 02 Pot 20 KQ slide E taper quad Pot 20 KQ slide w detents R31 47 06 121299 02 Pot 50 KQ slide E taper quad FILTER PCB ASSEMBLY Reference Ordering Name and Description Designator Number Name and Description Cap 5 uF 25V R3 4 6 125 47 03 119545 01 Res 8 25 KO zx 196 aW C2 31 32 15 02 107455 01 Cap 47 pF x 1095 100V 142 thru 33 34 35 149 C3 15 06 121387 01 Cap 0 63 uF 2 100V R5 6 7 8 39 47 01 102100 01 Res 8 2 KO 5 4W C4 15 06 121361 01 Cap 0 25 F 2 100V 100 105 C5 15 06 121357 01 Cap 0 1 uF 2 100V 110 114 C6 15 06 121353 01 Cap 0 04 pF 2 100V 120 C7 15 06 121349 01 Cap 0 016 uF 2 100V R9 38 70 47 03 108444 01 Res 4 12 KO 21 AW C8 15 06 121345 01 Cap 0 0063 uF 225 100V thru 99 C9 15 06 121341 01 Cap 0 0025 pF x 275 100V 103 104 C10 15 06 121388 01 Cap 0 5 uF 2 100V 108 109 C11 15 06 121360 01 Cap 0
14. ow ing procedure is recommended to check or adjust the alignment potentiometers 1 Remove four screws securing front cover open and lower cover 2 Move all filter controls and GAIN con trol to full upward position Move LOW PASS and HIGH PASS filter controls to OFF Move BYPASS switch to OUT Move LEVEL dBm switch to 21 posi tion Transformer accessory must be plugged in 3 Remove seven screws securing top cover to chassis lift off cover 4 Apply 100 Hz signal at a level of 10 dBm to terminals 1 and 4 of INPUT TB101 5 Move POWER switch to ON 6 Refer to Table lll for check points Locate appropriate resistors for asso ciated notch frequencies and check level 50 dBm or less at sides of resistors where circuit board traces lead to connector J1 As necessary adjust the associated alignment poten tiometers listed in Table III for null 7 When alignment is completed install top cover and secure with seven screws Control PCB Assembly To remove the control PCB assembly for replacement of one or more filter control potentiometers proceed as follows 1 Remove four screws securing front cover open and lower cover 2 Pull off all 31 filter control knobs 3 Remove seven screws securing top cover and seven screws securing bottom cover lift off covers 4 Remove four screws located at each corner of contro panel to free panel from rear chassis 5 Using one hand to restrain f
15. ssis ground at terminal 5 For unbalanced input connect additional strap to terminal 5 as shown Remove the seven screws securing the top cover lift off the cover and locate resistor Ri on the filter circuit board assembly see Figure 4 Remove resistor R1 from the circuit by cutting one or both leads This modification changes the input impedance of the 1650 to approxi mately 15 000 ohms To complete the circuit for the 15 000 ohm input application the 15335A Line Match ing Transformer accessory must be plugged into the INPUT ACC receptacle at the rear of the chassis see Table ll 8080B Pink Noise Generator Connections Substitution of the 8080B Pink Noise Generator for the input transformer plugged into the INPUT ACC receptacle at the rear of the chassis of the 1650 provides convenient flexibility in tailoring the audio spectrum within various acoustic environments While the 8080B is being used no connections are required at the INPUT terminal board TB101 normal input connections be come open circuit NOTE The LEVEL dBm switch on the rear of the chassis must be moved to the 21 position to prevent clipping of noise peaks INPUT Unbalanced Input Signal Source 0101090503050 Output Connections Output connections from the 1650 are made at the OUTPUT terminal board TB102 at the rear of the chassis see Table Il Terminal connections and cable requirements are the same as described for inp
16. ts these may be removed to allow the circuit board to be removed from the chassis to the extent permitted by wiring CAUTION Replacement of the complete circuit board assembly is not recom mended If necessary to unsolder wiring be sure to tag all wires according to position to facilitate later reconnection 4 When service Is complete reverse procedure to restore the unit PARTS LIST MAIN CHASSIS Reference Ordering Reference Ordering 23 Designator Number Name and Description Designator Number Name arid Description 24 04 112147 01 Knob filter control L101 102 56 01 043100 01 Choke ferrite bead A1 27 01 044910 01 Filter PCB assembly 103 104 L105 106 56 01 043110 01 Choke ferrite bead 101 102 51 02 118703 01 Switch DPDT slide 5103 51 02 113986 02 Switch DPDT lighted rocker T102 56 08 007606 01 Transformer power 27 01 044907 01 15 02 100089 01 15 01 114213 02 51 04 121511 01 51 04 100463 01 56 01 018215 01 56 01 018216 01 L3 56 01 018217 01 Reference Ordering Designator Number R1 thru R28 47 06 121298 01 R29 47 06 113123 01 Reference Ordering Designator Number C1 42 15 01 108543 01 A2 C101 102 C103 F101 F102 L1 L2 Control PCE assembly Cap 0 01 uF 20 1400V Cap 470 uF 40V Fuse 1 8 ampere 3AG slo blo Fuse 1 2 ampere 3AG Choke Inductor assembly Choke inductor assembly Ch
17. ut connections except that 15 000 ohm connections do not apply and no plug in transformer accessory is required SERVICE This service information is for the use of authorized warranty stations only Service must be performed by an ALTEC Qualified Service Representative NOTICE REPAIR PERFORMED BY OTHER THAN AUTHORIZED WARRANTY STATIONS OR OTHER QUALIFIED PERSONNEL SHALL VOID THE WARRANTY PERIOD OF THIS UNIT TO AVOID LOSS OF WARRANTY SEE YOUR NEAREST ALTEC AUTHORIZED DEALER For factory service ship the 1650 prepaid to ALTEC Customer Service Repair 1491 N Main Street Orange California 92667 For additional information or technical assistance call 714 774 2900 or Telex 65 5415 aoe ce cy cs xm a Gee IAS man er Cul resistor RT fram filter cir uit board assembly to chanae input impedance to approximately 15 000 ohms Figure 4 15 000 Ohm Input Connections Internal Fuse A fuse located beneath ac line power transformer T102 on the filter circuit board assembly protects the dc power supply from excessive current drain The fuse is accessible when the top cover is removed from the chassis see Figure 5 Replace only with the same type 1 2 ampere fuse see Parts List Notch Filter Alignment An alignment potentiometer is provided for each of the 28 notch filters The alignment potentiometers compensate for slight variations of the corresponding filler control potentiometers The foll
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