Altec Lansing 1715C User's Manual
Contents
1. LANSING 1707C 1715C Six Channel Mainframe Mixer Power Amplifier KEY FEATURES Six ports for inputs or outputs Offers systemwide remote muting Built in compressor limiter KEY SYSTEM SPECIFICATIONS Ref 1 kHz 1 dB 20 Hz 20 kHz 1 watt output 1 dB 20 Hz 20 kHz 0 775 Vrms output 600 Q load Frequency Response Direct Output Preamp Output Total Harmonic Distortion THD Direct Output Ref 1 kHz lt 0 05 20 Hz 20 kHz rated output power 30 kHz low pass filter lt 0 05 20 Hz 20 kHz 0 775 Vrms output 600 Q load EQ flat compressor limiter off 30 kHz low pass filter Preamp Output Signal to Noise Ratio Direct Output master at maximum Preamp Output gt 80 dB below rated output power A weighted gt 75 dB below 0 775 Vrms output A weighted EQ off compressor limiter off DESCRIPTION The Altec Lansing 1707C 1715C Mixer Power Amplifier is a six channel user configurable main frame amplifier By selecting from the large array of system component options the 1707C 1715C can become a six in one out microphone mixer amp lifier or a one in six out distribution preamplifier The basic mainframe combines a fully protect ed 75 watt for the 1707C or 150 watt for the 1715C power amplifier with six ports which can be input or output Multiple 1707C 1715C main frames can be linked together for situations where more then six input output ports2. Amplifier Output Preamp Output Link Output Auxiliary Input Control Mute and Tone Generator Controls Front Panel Input Compressor Limiter EQ Controls Output Miscellaneous Rear Panel Tone Generator Indicators Front Panel Microphone Phantom Power Power Requirements AC Mains 1707C 1715C Feedforward Topology 20 dB to 20 dB Continuously variable Ref 100 mVrms on Link input 1 1 to o 1 Continuously variable 50 msec to 5 sec Continuously variable Electronically produced Buzzer siren single tone chime and repeating tone chime All tones are initiated by remote switch closures Rear panel l RCA phono receptacle I RCA phono receptacle 3 terminal barrier strip 7 terminal barrier strip I RCA phono receptacle 1 RCA phono receptacle 1 RCA phono receptacle Screw Terminals 7 6 Input Level adjust I Release Time adjust screwdriver slotted I Threshold adjust screwdriver slotted I Compression Ratio adjust screwdriver slotted 1 On Off Switch Bass adjust 1 Treble adjust 1 EQ In Defeat switch I Master Level adjust 1 AC Power switch 1 Output Level adjust screwdriver slotted 6 Green LED s Nominal Input Level 6 Red LED s Peak Input Level 1 Red LED Main power output CLIP I AC Power ON 48 VDC 200 milliamps consumption Ref 1 kHz rated output with no modules installed 100 120 200 220 or 240 VAC 165
3. ZG HEN tel SCHEMATIC Ber x CHANNEL 6 Pis ES ES AR z CT U DEFEAT a SECTION or TITT on oa SS E Y le Alk C 702 vR502 SP TREBLE DOKB E mm 5434 ca a l e N c7os czai oT ele 33 18 DISPLAY SECTION BASS vr 301 Io 9 CON 9 ita Ka EE TE Bee 251 BUZZER YELP GENERATOR C206 979 AST A 8 O usa 1 50 ET z fis TL cT i 210 0h 2 ih H 1 9 A203 220K 8 Q 4 x re ER p20 0202 GENERATOR SECTION e OT TT Jeger pe pe MUTE O 1 PANTOM POWER C l R312 Er yd CH CHE AZ KARE 6308 eg bob st un yo R320 305 8 O 2 1 80 33K GNO C 0 106 Xs d Cam CHO gt om uu du LINK DUT O a x Y w muTE O x Q 403 fp 9302 47 P gt MTOM POWER ap S 2 cid e 2 2 EL Ve o ga Eis dE d 8 5 A o a 5 m cona VELP O s l Dr E OPTION re pn o ji if e GE H E o Q SWITCHAN SINGLE TONE C FE 222 l cow O S C 8 M vyx MUTE Um g SEN O L5 STS MUTE SECTION jor com SE ss Een r9 873 SERVICE INFORMATION NOTE QIDI 0004 0107 080 KIC 2240 BL IC 00 oun 2106 KTA 965 Y IC 201 3 So RESISTANCE VALUES ARE WDICATED IN OHMS UNLESS OTHERWISE SPECIFIED Q108 0109 p aedi K x ano PR ad to Qut 8A S6 BCY IC 401 2 CAPACITANCE VALUES ARE SHOWN IN MICROFARADS UNLESS OTHERWISE NOTED
4. ina iE NON dE P MICRO MICROFARADS gt 914 915 pre Kos gt e 3 ALL VOLTAGES ARE REFEMED TO GROUMD UNDER THE FOLLOWING CONDITIONS I 80 OC WO SIGNAL EXCEPT WHETE INDICATED QU6 GUT os ire 5 AC RMS 4 PRECAUTION Q001 9408 KTO 2058 r REG AlALL COMPOMENTS N MARKED MUST BE REPLACED ONLY WITH ORIGINAL TYPE SPECIFIED asos ETE De n BY THE MANUFACTURER INKEL PR CORPORATION ANC INSTALLED AS THE ORIGINAL SPACERS POSITIONED WAY FROM ADJACENT COMPONENTS WHERE APPLICABLE B ALL SOLDERING MUST BE DONE N A PROFESSIONAL MANNER USING SOLOER WITH ROSIN CORE ONLY Ci ML COVERS SHIELO AND INSULATING SPACERS MUST SE REPLACED BEFORE RETUMMING APPLIANCE TO CUSTOMER 0 A DAMAGED POWER SUPPLY CORD MUST BE REPLACED BEFORE RETURMNG TO CUSTOMER El DIELECTRIC TEST CONSISTING OF 200V AC 60Hz 15 TO BE APPLIED BETWEEN BOTH BLADES OF THE POWER SUPPLY CORD ATTACHMENT PLUG AND THE EXPOSED CONDUCTIVE SURFACE OF THE APPLIANCE FOR A PERIDO OF WOT LESS THAN OWE SECOND BEFORE RETURNING APPLIANCE TO CUSTOMER F THE pWr MARKED RESISTORS ARE MOUNTED THE PC D ON SLEEVES Q OM 90985 0117 Q 201 Q203 0401 0402 0404 406 902 904 302 rt IBSIN Q4o8 TD BOZE QI3 930 Q407 DOM DOO 642 KTA 1015 19 171980 COMPRESSO SECT 1 2K BRIDGE DIODE P232 1N5402 I707C 0008 DOG7 DOK UOM D 601 IN 4006 IN A148 DIOi 0102 IN O 0103 DIOS D201 0202 0301 D401 D403 De
5. 2 to 10 kN isolation transformer installed 1783 Line Output Module 1785A 600 to 10 kQ Input Isolation Transformer 1786 600 2 to 600 2 Output Isolation Transformer 1791 Female XLR Connector 1792 Male XLR Connector 1793 Dual RCA Phono Connector 1794 5 Lug Screw Terminals 8751A Programmable 14 Band EQ Module Altec Lansing continually strives to improve their products and performance Therefore specifications are subject to change without notice 4 ELECTRICAL CONNECTIONS FOR THE 1707C 1715C MIXER POWER AMPLIFIERS Power Connections 120 Volt 50 60 Hz The mainframe configuration for both mixer power amplifiers comes with the power trans former s primary line voltage strapped for 120 volt operation from the factory Refer to Table for exact strapping details and other voltage options The numbers in Table correspond to the numbered positions on the alternating cur rent terminal block connector which is ad jacent to the power transformer To select a line voltage install the colored primary lead wires into the corresponding numbered positions on the terminal block Table I AC Line Votage Selection and Strapping Chart Primary Line Voltage 220V 240V NOTE Make sure the line voltage corresponds with the selected line voltage power rating BEFORE you connect the main frame to the alternating current line Power Connections 100 200 220 or 240 Volt 50 6
6. Power Consumptlon and Heat Produced 1707C 75 watts output 25 watts output 1715C 150 watts output 50 watts output Operating Temperature Range Dimensions Width Height Depth Net Weight 1707C 1715C Finish Color Accessories Included with Malnframe 1 On Off switch I Bass adjust 1 Treble adjust I EQ In Defeat switch I Master Level adjust l AC Power switch Output Level adjust 6 Green LED s Nominal Input 6 Red LED s Peak Input I Red LED Main Output clip I AC Power ON I RCA phono receptacle I RCA phono receptacle I 3 terminal barrier strip I 7 terminal barrier strip 1 RCA phono receptacle I RCA phono receptacle 7 Screw terminals Ref 1 kHz rated output with no modules installed 100 120 200 220 240 VAC 50 60 Hz 48 VDC bipolar 1 5 amps maximum 3 0 amps maximum 165 w consumed 306 BTU hour 130 w consumed 357 BTU hour 320 w consumed 578 BTU hour 230 w consumed 612 BTU hour Up to 50 C 122 F 19 inches 48 3 cm 5 inches 13 3 cm 13 inches 33 0 cm 25 lbs 11 4 kg 32 lbs 14 5 kg Black 1 Operating Service Instructions for Mainframe 1780A AT 1781A AT and 1783 l Preamp Out to Amp In U Shorting Bar l Direct Output to OT in Shorting Bar System Configuration Label 1 International 220 240 VAC voltage decal l International Fuse decal and fuse 1 Rack mount hardware kit Altec Lansing
7. Svstem 2 Zone 2 Master INPUTS 1 6 AT 1707C INPUTS 1 12 System 1 AE Note Preamp Out Amp In jumper removed in system 1 Link Out Link in INPUTS 7 12 INPUTS 1 12 Master Figure 11 Typical Linking Connections Master E INPUTS 1 6 707C gt E INPUTS 1 4 Preamp Out Amp ln NE Tip Sleeve Tip Sieeve ag Signal A Flow 2 E MI Le Cam A SP jule Input Qutput Externsi E quallzer Pracessor Figure 12 Patching an External Equalizer or Other Signal Processing Device AUX OUT Connections The auxiliary output AUX OUT phono con nector on the rear panel is wired directly internally to the AMP IN phono connector You can use it to drive a second amplifier or a tape recorder Please refer to the 1707C 1715C mixer power amplifier s block diagram shown in Figure 7 Batterv Input Connections You can power a system from the battery input connector for auxiliary operation or standby switchover The battery input connector is the three terminal barrier strip located on the upper left rear panel of the mainframe The system requires two 48V DC battery power sources To connect the battery backup system to the three terminal barrier strip follow the three steps shown in Figure 13 Step O Remove Cisar Plastic Cover Siep 2 Connect DC Power Sources ss Shown Step 3 Re inetail Clear Plastic Protective Cover DC Power Sources Fig
8. are required Built in features include a trap door on the top panel for easy access into the unit compressor limiter low and high frequency shelving equalizers muting remote volume control capability and a tone generator which produces four different sounds Input Modules The Altec Lansing 1780A 1780AT Input module and the 1781A 1781AT Programmable Input module accept either mic or line level signals through a wide variety of connec tor interfaces Output Modules The Altec Lansing 1783 Line Output module allows the user to interface with other professional equipment The Altec Lansing model 1707C 1715C mix er power amplifier systems respond to most design tasks with the ease and versatility of systems costing much more s a result it is the choice for use in professional installations requiring high quality flexibility in design and low cost Continuous Average Power 1707C 1715C Maximum Midband Output Power 1707C 1715C Power Bandwidth Direct Output Intermodulatlon Distortion Direct Output Damping Factor Direct Output Rated Output Level Direct Output 1707C 1715C Preamp Output Transformer Output 1707C 1715C Equalization Bass Treble Compressor Limiter Threshold Compression Ratio Release Time Tone Generator Tones Control Level Adjustment Protection Svstem Amplifier Load Front Panel Controls input Compressor Limiter 1707C 17
9. continually strives to improve their products and performance Therefore specifications are subject to change without notice 1780A 1780AT Description The Altec Lansing 1780A 1780AT Mic Line Input modules combine basic microphone preamplifi cation with true line level input capabilitv The module has a built in resistive pad to permit levels in excess of 0 dBu and its high input impedance easilv allows sixteen modules to be driven from a single low impedance source Also the module offers a 300 Hz high pass filter phantom power capability L R stereo summing and 0 to 50 dB of continuously variable gain Included in the 1780AT version is a 10 kQ input bridging trans former for those who prefer transformer isolation INPUT 1780A 1780AT Specifications Gain 0 50 dB continuously variable Input Sensitivity Without Pad 68 dBu to 18 dBu 3 mVrms to 100 mVrms 48 dBu to 2 dBu 3 mVrms to 1 Vrms With Pad Input Impedance 1780A 10 kQ 1780AT 10 kQ With 1793 Dual Phono 40 kif Frequencv Response 50 Hz 20 kHz 1 dB Total Harmonic Distortion Ref minimum gain 90 Hz 20 kHz measurement bandwidth 30 kHz low pass filter 1780A lt 0 01 1780AT lt 0 025 Equivalent Input Noise lt 120 dBr Ref 0 dBr 100 mVrms out put 10 kQ load 200 input termination maximum gain A weighted High Pass Filter Comer Frequency Slope Controls Weight Net 17804 Power Supply Requ
10. mixer power amplifier then sums the signal at the wiper of each input channel level control into a true virtual ground sum ming node or bus The summing amplifier has eight input channels input channels one through six on the front panel tone gen erator output and the link input or LINK IN on the rear panel The summing amplifier s output signal drives the link output or LINK OUT located on the rear panel of the main frame The E Q and compressor limiter sec tions are in series with each other as shown in Figure 7 The compressor limiter s output signal drives the preamplifier output or PREAMP OUT located on the rear panel which then provides the input signal to the main amplifier section The BASS and TREBLE E Q controls are ideallv suited to make adjustments to the overall response of the mix The low and high frequency shelving equalizers provide 12 dB of boost and cut with the maximum boost occurring at 100 Hz and 10kHz respectively 7 OUTPUT FUSE VOLTAGE RAILS The compressor limiter section features variable release time compression ratio and threshold The circuit uses a feed forward topology that will minimize level differences for a more nearly constant output level The compression ratio can approach 1 and the attack time is fixed at approximately 10 ms The main amplifier section protects itself and the load against radio frequency interference spurious oscillatory
11. output 600 2 load Total Harmonic Distortion THD Direct Output Transformer Output Link Output Preamp Output Intermodulation Distortion Direct Output lt 0 05 20 Hz 20 kHz Ref 1 kHz rated output power 30 kHz low pass filter lt 1 0 50 100 Hz lt 0 1 100 Hz 20 kHz Ref 1 kHz rated output power 30 kHz low pass filter lt 0 05 20 Hz 20 kHz Ref 1 kHz 100 mVrms output 10 kQ load 30 kHz low pass filter lt 0 05 20 Hz 20 kHz Ref 1 kHz 0 dBm output 600 load EQ flat compressor limiter off 30 kHz low pass filter SMPTE 4 1 less than 0 1 at rated power Input Sensitivity Input Impedance For rated output power Ref 1 kHz 0 dBu 0 775 Vrms Using 1780A 1780AT balanced no pad Using 1780A 1780AT balanced w pad Using 1781A balanced Using 1781AT balanced Using 1781A 1785A balanced 0 3 to 100 mVrms 10 KQO 68 dBu to 18 dBu 3 mVrms to 1 Vrms 10 kQ 48 dBu to 2 dBu 0 3 to 100 mVrms 10 KQO 68 dBu to 18 dBu 0 1 to 30 mVrms 600 2 78 dBu to 28 dBu 0 1 to 30 mVrms 6000 78 dBu to 28 dBu Link Input unbalanced Amplifier Input unbalanced Rated Output Level Minimum Load Impedance Link Output unbal Preamp Output unbal Auxiliarv Output unbal Direct Output 1707C 1715C Transformer Output 1707C 1715C Damping Factor Direct Output Signal to Noise Ratio D
12. watts maximum 100 120 200 220 or 240 VAC 320 watts maximum Power Requirements Battery 1707C 1715C Power Consumption and Heat Produced 1707C 75 watts output 25 watts output 1715C 150 watts output 50 watts output Operating Temperature Range Dimensions Width Height Depth Net Weight 1707C 1715C Finish Color Included Accessories 4 Operating Service Instruction documents One each for the Mainframe 1780A AT 1781 A AT and 1783 48 VDC bipolar 1 5 amps maximum 48 VDC bipolar 3 0 amps maximum 165 watts consumed 306 BTU hour 130 watts consumed 357 BTU hour 320 watts consumed 578 BTU hour 230 watts consumed 612 BTU hour Up to 50 C 1227F 19 inches 48 3 cm 5 4 inches 13 3 cm 3 standard rack units 13 inches 33 0 cm 25 Ibs 11 4 kg 32 Ibs 14 5 kg Black 1 Shorting Bar Installed on Direct Output to OT in I U Shorting Bar Installed on Preamp Out to Amp In 4 Rubber Feet installed I System Configuration Label installed on top cover 1 International fuse International 220 240 VAC voltage sticker International Fuse sticker 1 Rack mount hardware kit Optional Input Output Accessory Modules 1780A Mic Line Input Module 1780AT Mic Line Input Module with 10 kQ bridging transformer installed 1781A Programmable Input Module 1781AT Programmable Input Module with 1785A 600
13. waveforms excessive temperatures direct current turn on turn off transients and excess voltage current phase shift due to reactive loading A signal overload circuit monitors the level at the output stage of the amplifier section The front panel CLIP LED indicator illuminates when signal levels are high enough to cause significant output clipping A dual slope V I limiter protects the output devices It keeps the output devices operating within their SOA safe operating area as de fined by the device manufacturer A special integrated circuit function block monitors the heatsink temperature power supply voltage and the amplifier s output When it detects a problem it immediately disengages the output relay Output Connections Make output connections to the seven ter minal barrier strip connector located on the lower left side of the mainframe s rear panel The 1707C main output connections include an 8 Q direct output 24 5 vrms and three transformer balanced outputs 4 Q 17 4 vrms 25 vrms 8 3 Q and 70 7 vrms 66 6 Q The 1715C main output connections include a 4 Q direct output 24 5 vrms and a 25 vrms 4 2 Q an 8 Q 34 6 vrms and a 70 7 vrms 33 3 2 balanced transformer output Refer to Figure 8 for a display of the direct output connections and Figure 9 to see the transformer output connections OT an TOV 25V 4n COM IN lojorofolelo o oc A HT t JH ql Figure 8 Direct O
14. 0 Hz You may change the mixer power amplifier s 120 volt power connection to a 100 200 220 or 240 volt power connection by re strapping the power transformer s primary line voltage Use the following procedure to change the factory strapping to another line voltage 1 If you connected the mixer power amplifier to an alternating current power source disconnect it 2 Remove and save the nine screws that secure the mixer power amplifier s top cover There are two screws near the bottom of each side two screws on top near the rear edge of the front panel and three screws at the top edge of the rear panel Refer to Figure 1 for details Remove 2 screwa bu 2 screws 3 ccess Panel a AS Remove 3 Screws Remove 2 screws Figure 1 Top Cover Removal Transformer Primary Lead Color WHITE YELLOW RED BLUE ORANGE a 93 HK ANE 3 Locate the voltage selection terminal block between the side of the chassis and the power transformer Refer to Figure 2 for details Figure 2 Location of Voltage Selection Terminal Block 4 While referring to Table I disconnect the primary lead wires from the terminal block Pull each wire firmly to disengage the push on connector Then reconnect each lead wire into its designated position on the terminal block that corresponds to the de sired line voltage Press each connector to snap into place 5 I
15. 15C Specifications cont d 75 watts 150 watts Ref 1 kHz at 1 THD 100 watts 175 watts Ref 1 kHz at rated output gt 20 Hz 20 kHz SMPTE 4 1 lt 0 1 at rated power gt 40 20 Hz 1 kHz Ref 1 kHz unbalanced 24 5 Vrms 8 Q load 24 5 Vrms 4 Q load unbalanced 0 dBm 600 2 min load balanced 17 4 Vrms 4 Q load 25 0 Vrms 8 2 load 70 7 Vrms 66 6 Q load 25 0 Vrms 4 2 Q load 34 6 Vrms 8 2 load 70 7 Vrms 33 3 Q load Shelving type 12 dB at 100 Hz 12 dB at 10 kHz Feedforward Topology 20 dB to 20 dB Continuously variable Ref 100 mVrms on Link input 1 1 to 0 1 Continuously variable 50 msec to 5 sec Continuously variable Electronically produced Buzzer siren single tone chime and repeating tone chime All tones are initiated by external switch closures Rear panel e Short circuit current limiting e Over voltage limiting e Thermal sensing e Spurious oscillatory protection e Low AC line sensing e Output DC detection e Subsonic detection e Tum or off transients 3 secs 6 Input Level adjust I Release Time adjust 1 Threshold adjust 1 Compression Ratio adjust EQ Controls Output Miscellaneous Rear Panel Controls Tone Generator Front Panel Indicators Connectors Amplifier Input Link Input Battery Amplifier Output Preamp Output Link Output Mute and Tone Generator Power Requirements AC Mains Battery 1707C 1715C
16. 5 01 027327 AF RSA 47uF 25V C110 15 01 026641 AF RSA 47uF 50V C004 005 15 01 037 1441 AF RSA 47uF 63V 009 010 C000 15 01 0377171 AF NP 47pF 25V C604 614 15 01 0374321 AF RSA I00uF 16V C011 012 15 01 0372251 AF RSA 100uF 25V 021 022 601 602 C015 15 01 124503 AF RSA 100pF 50V C003 15 01 124501 AF RSA 100pF 100V 15 01 0374271 AF RSA 470pF 50V C001 002 15 01 0374281 AF HM 6800yF 63V 1715C 1715C C001 002 15 01 0377311 AF HM 4700 uF 63V 1707C 1707C C309 310 15 02 0374291 M 0 0015 pF 100V J C504 15 06 0371391 M 0 0018 pF 100V J 15 06 0371401 M 0 0033 F 100V J C308 15 06 0371941 M 0 0056 uF 100V J C502 503 15 06 0372851 M 0 018 uF 100V J C312 15 06 0377 191 M 0 033 pF 100V J DESIGNATOR ALTEC PART DESCRIPTION NUMBER C104 505 15 02 107455 C 47pF 50V J 603 613 C106 108 15 02 0372051 C 100pF 50V J 109 611 C506 703 15 02 107470 C 220pF 50V J C102 107 15 02 100304 C 0 001 uF 50V Z 299 608 616 C201 205 15 02 0371791 C 0 01 pF 50V Z 298 301 302 402 404 C610 15 02 0371641 C 0 047 pF 50V Z C315 15 02 0371651 C 0 1uF 50V Z FEE 15 02 0377241 C 0 0047 pF 400VAC Cl PT 56 08 0374411 POWER 1715C TRANSFORMER 1715C PT 56 08 0377321 1707C OPT 56 07 0377251 1715C TRANSFORMER 1715C OPT 56 07 0377331 OUTPUT 1707C TRANSFORMER 1707C POWER TRANSFORMER 1707C OUTPUT 18 SCHEMATIC e e AE
17. AK 100mV RMS oe LA aN DISPLAY CH 1 6 e INPUT PUT U O O MIX QUT R Note Switches not included L LEVEL with mainframe MUTE S S T T O N R T E BUZZER G E TONE GEN YELP N OUTPUT LEVEL e 100mY RMS u E m LINK OUT e PREAMP 0 775V RMS OUT ra AMP IN E AUX OUT e e POWER SWITCH x USER INSTALLED STRAPS Figure 7 above displays a block diagram of the mixer power amplifier mainframe Study it carefully To use the system s full capabil ities you ll need a good understanding of the inner workings of the mainframe Brief ex planations of how the inside of the mainframe works follow in the text below The signal coming from each additional input module like the 1781A 1781AT 1780A or 1780AT is simultaneously routed to the mixer power amplifiers front panel nominal peak LED indicators and to the input channel level controls The dual LED nominal peak displays are pre fader and designed to monitor the output level from the corresponding input module The nominal green LED in dicators have an approximate 10 dB window over which they will illuminate This makes it easy to properly adjust the gain for each input module while efficiently using the rest of the system in terms of performance and headroom AC LINE FUSE POWER ON x za VOLTAGE SELECTOR POWER SUPPLY 100 120 200 220 240VAC 50 60HZ 4BV DC INPUT Figure 7 Block Diagram of 1707C 1715C Mixer Power Amplifiers The
18. ANP C d KTA Op PMP KTC 1815 NPN KTC2240MPN ZA DES Pp 254960 Pe 234 1302 PMP KTO DES PNP 230 Te wen 2301302 NPN asc 2205 wn 2502230 MP 25C 3281 WPN KTD 2008 NPN 285 600 PNP TO 62507 P THRESH I LOG AV I COM OUT I SIG OUT I Cl CFT YCI SG INI REC INI mtr Y EQUIPMENT MIXER AMPLIFIER MODEL I715C 17070 CHECKED DATE DRAWING NO oO 23456789 za 14 vob vot 9880192
19. ATOR NUMBER D003 007 012 48 01 027300 104 601 D101 102 48 01 125214U D103 108 201 48 01 122601 202 301 401 IN 4006 IN 60 IN 4148 403 602 603 901 902 D008 009 48 01 0374001 DO10 001 013 48 01 113386 ZENER UZ 24BM ZENER UZ 18BM ZENER UZ 5 6BM D203 48 01 0376801 POWER LED 39 01 0376811 CLIP LED 39 01 0374031 D904 RLY A 45 01 0376821 RLY B 45 01 0373941 RELAY RY 24W K DC 24V SWITCH 51 02 0376831 SLIDE SSJ622 REC KLR 208 2x5 RED LED SLR 54GG R5 GRE ROHM LED SLR 54UR R5 RED ROHM RELAY T90N1D12 12 bo THERMAL 51 02 0374421 T105 ARIUI SWITCH F001 002 51 04 0374381 NB 31 8 mm 4A 250V 1715C UL CSA 1715C 51 04 0376841 NB 31 8 mm 6A 250V 1715C UL CSA 1715C SB 31 8mm 3A 250V UL CSA 1707C 1 1 51 04 0377281 1707C 2 51 04 0376851 1715C 2 F 51 04 0377291 1707C F F F NB 31 8mm 7A 250V UL CSA 1715C NB 31 8mm 3 5A 250V UL CSA 1707C F001 002 51 04 0377341 NB 31 8 mm 24 250V 1707C UL CSA 1707C SVR101 102 47 06 0374391 SEMI 470B 10 5 SVR601 47 06 03 73991 VR901 47 06 0373951 SEMI CS 100KB 10 5 b 16 K161 MOO 20KA DESIGNATOR ALTEC PART DESCRIPTION NUMBER VR501 502 47 06 0373961 o 16 K161 MOO 100KB CC VR503 47 06 0376861 o 16 K161 MOO 50KB VR601 47 06 0373971 o 12 K121 LOO 10KA VR602 47 06 0373981 b 12 K121 LOO IOKRD VR603 47 06 0376871 o 12 K121 LOO 100KB CC TONE LEVE
20. C mixer preamplifier For more information on the 1700C mixer preamplifier you may order the operating instruction manual P N 42 02 029241 or the specification sheet P N 42 07 029242 from our Order Entry Department The signal appearing at the LINK OUT con nector is the summation of all input channels as mixed by the input channel level controls LINK IN is a direct input to a system s mixing amplifier it s also a seventh input channel To link two units together connect LINK OUT of system one to LINK IN of system two Sys tem two will now control the mix of up to twelve input channels Please refer to Figure 11 for typical linking connections NOTE The LINK OUT signal is not affected by the compressor limiter or the E Q cir cuits PREAMP OUT AMP IN Connections The PREAMP OUT signal is a mix of all input channels processed by the compressor limiter and tone control circuits Normally you would inserta U shorting bar between the PREAMP OUT and AMP IN phono connectors on the rear panel However vou can remove the shorting bar to patch in an external equalizer or other signal processing device with a pro per level match of 0 775 vrms nominal Figure 12 shows a typical application using an ex ternal equalizer or other signal processing device Di ei l INPUTS 1 6 Fund 1707C INPUTS 1 6 Svstem 1 Link Qut Zone 1 Master Signal Flow INPUTS 7 12 FL Zone 2 INPUTS 1 12
21. L 47 06 0376881 o 16 IOKAXI ADJUST R127 130 47 01 124825 WW CE 0 270 SW R ROOO 006 47 01 0372011 MO 102 1W 5 R131 47 02 0374241 MO 100 3W W COIL Riss rores Mo 2700 18 ma 1715C 1715C mm arovosressI criokn 5w 1 R118 120 47 01 0371221 CF 1 5 KQ 1 5W 5 1707C 1707C R107 47 01 0374231 CF 56012 1 5W 5 R105 106 47 01 0371211 CF IkQ 1 5W 5 123 126 404 R606 633 47 01 0373711 CF 1 2kQ 1 5W 5 47 01 0374221 CF 680 1 5W 5 DESIGNATOR ALTEC PART DESCRIPTION NUMBER ro OO 47 01 0371221 CF L k 1 5W 5 413 416 505 47 01 0376961 CF 2 2kQ 1 5W 5 506 607 47 01 037253I CF 3kQ 1 5W 5 R618 47 03 0376971 CF 3 24k 1 5W 1 R415 910 911 47 01 037254I CF 3 3kQ 1 5W 5 R008 009 47 01 0371661 CF 4 7k 1 5W 5 402 905 R417 305 47 01 0372551 CF 5 6k 2 1 5W 5 R627 628 308 47 01 037 168I Note If Q302 isa KTC1815 Y then R308 is 47 01 0371251 CF ki 1 5W 5 R319 504 47 01 0372561 CF 8 2k0 1 5W 5 R002 003 47 01 0371691 CF 10k42 1 5W 5 119 110 113 208 608 611 R502 702 47 01 0371241 CF 12kQ 1 5W 5 706 912 RO17 103 47 01 0371251 CF 15kQ 1 5W 5 104 108 212 RO29 030 CF 7 5kQ 1 5W 5 630 631 904 1715C 1715C R121 122 47 01 0372581 CF 47kQ 1 5W 5 1707C 1707C R001 022 47 01 037257 I CF 22k Q 1 5W 5 102 403 414 R330 47 01 0373571 CF 27kQ 1 5W 5 R020 204 47 01 0371741 CF 33kQ 1 5
22. R 1793 dual phono and the 1794 5 lug screw terminal connector The mixer power amplifier shall be the Altec Lansing Model 1707C 1715C ALTEC LANSING a MARK IV company P O BOX 26105 e OKLAHOMA CITY OK 73126 0105 e U S A e 405 324 5311 or FAX 405 324 8981 1992 ALTEC LANSING CORPORATION PRINTED IN U S A 7 92 Revision 1 42 07 029244 ALTEC the sound of experience 1707C amp 1715C Mixer Power Amplifiers Operating and Service Instructions ALTEC LANSING CORPORATION MA a RK IV companv P O Box 26105 e OKLAHOMA CITY OK e 73126 0105 e 405 324 5311 or FAX 405 324 8981 Table of Contents Section SPECIFICATIONS ELECTRICAL CONNECTIONS FOR THE 1707C 1715C MIXER POWER AMPLIFIERS Power Connections 120 Volt 50 60 Hz Power Connections 100 200 220 or 240 Volt 50 60 Hz INSTALLING MODULES IN THE MAINFRAME SHELF OR RACK MOUNTING THE 1707C 1715C MIXER POWER AMPLIFIERS Ventilation CONFIGURING THE MAINFRAME The Mainframe s Inner Workings Output Connection Output Fuse Mute Tone Generator Connections The Rear Panel Output Level Control Resistance Effects of Long Cable Runs on Mute and Tone Generator Circuits LINK IN LINK OUT Connections PREAMP OUT AMP IN Connections AUX OUT Connections Battery Input Connections FRONT REAR PANEL CONTROLS SWITCHES INDICATORS AND CONNECTORS INITIAL SETUP AND OPERATION OF MAINFRAME WITH MODULES INSTALLED Initial Setup of an Input Module Initial
23. Setup of an Output Module Initial Setup of the Mainframe Operating the 1707C 1715C Mixer Power Amplifiers SERVICE INSTRUCTIONS SERVICE INFORMATION Power Amplifier Bias Adjustment Power Amplifier DC Offset Adjustment Parts Ordering Factory Service Technical Assistance Pants List List of Tables and Figures Table I AC Line Voltage Selection and Strapping Chart Table Il AC Fuse Selection Chart Table lil Maximum Allowable Cable Resistances Figure 1 Top Cover Removal Figure 2 Location of Voltage Selection Terminal Block Figure 3 Application of International Stickers Figure 4 Module Installation Figure 5 Removal of Blank Cover Panel Figure 6 System Configuation Label Figure 7 Block Diagram of 1707C 1715C Mixer Power Amplifiers Figure 8 Direct Output Connections Figure 9 Transformer Output Connections Figure 10 Mute Tone Generator Switch Connections Figure 11 Typical Linking Connections Figure 12 Patching an External Equalizer or Other Signal Processing Devices Figure 13 Battery Input Connections Figure 14 Front Panel Controls Switches and Indicators for the 1707C 1715C Figure 15 Rear Panel Control and Connectors for the 1707C 1715C Figure 16 Schematic of the 1707C 1715C Mainframe Page gt B O0O0MMM MMMONND D OOM Oo OO 000 N 0 000 O Y Om 01 Y O 11 Gatefold Description The 1707C and 1715C Mixer Power Amplifiers offer a highly flexible integration of a user configurable six in
24. The continuously variable output level control is local to the module permitting independent adjustment of each line output 1783 Specifications Output Source Impedance 50 Q Nominal Output Level Load Impedance 8 dBm Ref 1 kHz 0 dBm 0 775 Vrms with 600 2 load output level control at maximum 100 mVrms input Maximum Output Level 24 dBm Frequency Response Ref 1 kHz 8 dBm output 1 dB 20 Hz 25 kHz Total Harmonic Distortion THD Ref 1 kHz 8 dBm output output level control at maxi mum 30 kHz low pass filter 20 Hz 20 kHz lt 0 05 Signal to Noise Ratio gt 88 dBm Below 8 dBm output out put level control at maximum A weighted Power Requirements 18 VDC at 20 mA supplied by mainframe 1786 Output Isolation Transformer Impedance Ratio 1 1 600 0 600 N Frequency Response Ref 1 kHz 18 dBm output dB 20 Hz 20 kHz Total Harmonic Distortion THD Ref 1 kHz 18 dBm output 20 Hz 20 kHz 0 596 50 Hz 20 kHz 0 196 Special Ordering Instructions NOTE The modules listed below are required for use with the 1707C 1715C and must be ordered separate from the mainframe Plug in Input Modules 1780A Mic Line Input module 1780AT Mic Line Input module with 10 kQ bridging transformer installed 1781A Programmable Input module 1781AT Programmable Input module with model 1785A 600 22 to 10 kQ isolation transformer installed 1785A 600 Q to 10 kQ Input Isolation Trans
25. W 5 320 R615 47 03 0377031 CF 39 2kQ 1 5W 1 R908 47 01 0372851 CF 47kQ 1 5W 5 16 DESIGNATOR ALTEC PART DESCRIPTION NUMBER 47 01 0372581 CF 4710 1 5W 5 RO23 109 RO19 024 47 01 0371751 CF 56k42 1 5W 5 025 507 629 632 901 707 708 701 605 R704 705 il 47 01 0373691 CF 75KQ 1 5W 5 47 03 0377041 CF 93 1kQ 1 5W 1 47 01 0371261 CF 100kQ 1 5W 5 47 01 0372601 CF 120kQ 1 5W 5 47 03 0377061 CF 162k 1 5W 1 47 01 0372611 RO16 304 307 310 311 315 316 318 CF 220kQ 1 5W 5 RO21 203 209 205 207 210 211 301 306 410 47 03 0377071 Rola 60 SE 47 01 0373651 47 01 0373631 CF 1 5m 1 5W 5 47 01 0373681 CF 2 2mf2 1 5W 5 47 01 0374151 CF 3 3m4Q 1 5W 5 15 01 0372191 AF RSA 0 47 pF 50V 15 01 124507 AF RSA 1pF 50V C306 15 01 0377111 AF RSA 3 3pF 50V 609 15 01 0377121 AF RSA 4 74 F 25V C607 15 01 03722 11 AF RSA 4 7pF 50V 15 01 122935 AF RSA 10pF 35V R625 R309 A R201 202 215 317 R314 902 R302 303 603 C017 C016 202 203 311 313 605 901 902 C101 112 606 615 17 DESIGNATOR ALTEC PART DESCRIPTION NUMBER C111 112 15 01 0372221 AF RSA 10pF 50V 207 409 C204 15 01 0377151 AF RSA 22yF 16V C018 15 01 0371431 AF RSA 22yF 25V C501 507 612 701 704 15 01 037380I AF RSA 33yF 16V 705 903 CO19 103 15 01 0377 16I AF RSA 47uF 16V 105 208 401 C300 316 1
26. address ALTEC LANSING Customer Service Repair 10500 W Reno Oklahoma City OK 73128 U S A Please enclose a note that provides the fol lowing information Any details describing the problem and the conditions under which the problem occurred such as where used how used and so forth Failure to enclose any helpful information may delay the processing of your service order Technical Assistance For applications assistance or other technical information call 405 324 5311 FAX 405 324 8981 or write ALTEC LANSING Technical Assistance P O Box 26105 Oklahoma City OK 73126 0105 U S A DESIGNATOR IC 001 IC 201 IC 301 501 IC 605 IC 602 IC 601 IC 701 IC 603 604 Q114 115 1715C Q114 115 1707C Q116 Q117 1715C Q116 117 1707C Q101 104 107 Q105 106 Q108 Q109 Q001 408 Q409 Q403 901 Q002 003 112 201 203 Q113 301 407 302 401 402 404 406 902 904 D001 002 1715C D001 002 1707C NUMBER 17 01 124804 17 01 0374081 17 01 027463 48 03 124821 NPN 2SC 3281 1715C 48 03 0377261 NPN 2SD 718 1707C 48 03 124820 PNP 2SA 1302 1715C 48 03 0377271 PNP 2SB 688 1707C 48 03 124824 NPN KTC 2240 BL PNP KTA 1015 Y 48 03 026624 NPN 2SC 1815 Y 42 02 0375651 BRIDGE KBPC 25 04 LUG TYPE 48 01 0376741 6A2 1715C 48 01 0376781 IN 5402 1707C 17 01 0374061 15 ALTEC PART DESCRIPTION DESIGN
27. ardous voltage within the chassis Ser vicing information contained within this document is for use only by ALTEC LANSING Corp authorized warranty stations and qualified service personnel To avoid electric shock DO NOT perform any servicing other than that contained in the Operating Instruc tions unless you re qualified to do so Refer all ser vicing to qualified service personnel SERVICE INFORMATION WARNING ALTEC LANSING recommends that you do not modify its products Such modifications shall be at the sole ex pense of the person s or company re sponsible Any damage to persons or property resulting therefrom shall not be covered under warranty or otherwise Power Amplifier Bias Adjustment NOTE This adjustment requires a DC volt meter Figure 16 shown on the gatefold is the schematic of the mainframe You ll need trimpot SVR102 provided in this system s package to set the bias of the amplifier You should set the bias current to approximately 20 milliamps DC To set the bias use a battery powered DC voltmeter capable of reading in the millivolt range and follow the procedures outlined below If you must use an AC pow ered voltmeter floatthe AC ground wire using the appropriate adapter 1 With the unit unplugged remove the top cover from the unit to expose the main circuit board See Figure 1 on page 5 for how to remove the top cover 2 Connect the rated load impedance to the direct ou
28. are sensitive to heat you should not place the amplifier be tween other heat generating equipment or in areas where the ambient temperature ex ceeds 50 C 122 F lf you mount the mainframe in an equipment rack or cabinet with other heat producing 6 equipment provide adequate space between the units Otherwise the equipment may become too warm If a rack or cabinet contains several amplifiers you may need to check the ambient air temperature To determine the ambient air temperature operate the system until the temperature stabilizes Measure the ambient air with a bulb type thermometer held at the bottom of the uppermost amplifier CAUTION Dont let the thermometer bulb touch the metal chassis The chassis might be hotter than the ambient air CAUTION If the air temperature exceeds 60 C 140PF place the equipment farther apart or install a blower to provide air movement within the cabinet Make sure you don t block the air intake holes located on the bottom of the chassis or the exhaust holes on the top cover CONFIGURING THE MAINFRAME The Mainframe s Inner Workings b DEFEAT ee ID DIN ON HELVING i f EQUALIZER COMP LIM SUM 9 c L msn RELAY REBL THRESHOLD COMP REL O BASS TREBLE RATIO TIME Ba EN ene ns am Be A I AS Ar OUTPUT BARRIER TRANSFORMER STRIP PROTECTION THERMAL POWER MASTER AMPLIFIER MODULE OUT NOMINAL yoyo PE
29. ditional mod ules into the mixer power amplifier which has six ports that you can con figure as input or output modules INSTALLING MODULES IN THE MAINFRAME For detatled instructions on how to install ad ditional input and output modules you may order the following operating instruction manuals from our Order Entrv Department P N 42 02 027720 for the 1781A AT Mic Line Input Modules P N 42 02 026653 for the 1780A AT Mic Line Input Modules P N 42 02 027721 for the 1783 Line Out put Module 1 Remove and save the two screws that secure the access panel to the top cover Refer to figure 1 for details 2 Plug the input or output module into one of the six channel positions with the con trols facing the rear as shown in Figure 4 Secure the module with the two screws provided 7 Module PCB A Edge Connector Praes down firmiy to Inaure proper seating with mate connector on mother board ami OD Module P d screws 2 Figure 4 Module Installation 3 Remove the blank cover panel as shown in Figure 5 Install the selected connector assembly with the screws provided Plug the pigtail connector from the main con nector assembly onto its appropriate male mating connector on the module s printed circuit board jA Remove two screws Figure 5 Removal of Blank Cover Panel 4 Onthetopcover isa System Configuration Label Use it to indicate the module type configuration a
30. ds A single tone chime S T A repeating tone chime R T A buzzer or A yelp siren Forthe duration of atone the tone generator automatically mutes any input modules con figured in the slave mode Output Level Control The tone generator s output level control is conveniently located on the rear panel of the mainframe To in crease the tone generator s output level rotate the screwdriver slotted control shaft clock wise NOTE Optional External Mute connected at the factory allows external muting of the tone generator If disconnected the tone generator cannot be extern ally muted Resistance Effects of Long Cable Runs on Mute Tone Generator Circuits Table Ill shows the maximum allowable cable resistance total resistance that the mixer power amplifier can support Resistances greater than these values resulting from excessively long cable runs or small gauge wire may cause the mute or tone generator circuitry to fail to operate Please make sure all cable resistances are less than the values shown in Table III 8 Table Ill Maximum Allowable Cable Resis tances Function Resistance S T Chime R T Chime Buzzer Yelp Mute LINK IN LINK OUT Connections The LINK IN LINK OUT phono connectors on the mid rear panel of the mainframe permit you to dynamically link two or more systems together If you require more channels the 1707C 1715C mixer power amplifiers are fully compatible with 1700
31. former for installation on existing model 1781A Plug in Output Module 1783 Line Output module 1786 Output Isolation Transformer Plug in EQ Module 8751A Programmable 14 Band EQ module NOTE Each module selected requires one of the following connectors also be ordered 1791 1792 Female XLR Male XLR 1798 1794 Dual RCA Phono r 5 Lug Terminal CONFIGURING THE MAINFRAME The Mainframe s Inner Workings MODULE OUT NOMINAL yoyo PEAK 100mV RM ZIN ek IN Tr 1 INPUT OUTPUT MIX OUT INPUT with mainframe LEVEL SUM EI 33 e f a I a a 100mY RMS MUTE f SUMMING BUS i t 44 5 BUZZER P TONE GEN YELP OUTPUT ODEFEAT QOFF jo JOON COMP LIM i PR vy li DIN SHELVING EQUALIZER BASS TREBLE RELAY l THRESHOLD COMP REL RATIO TIME 100mY RMS Z IN 10K LEVEL u E LINK OUT O LE C 0 775V AMS AMPIN AUX DUT MASTER POWER AMPLIFIER BARRIER TRANSFORMER STRIP POWER ON E A ue a VOLTAGE POWER SAC UNE SELECTOR SWITCH FUSE 100 120 200 220 240VAC 50 60HZ JK USER INSTALLED STRAPS V VOLTAGE POWER du RAILS SUPPLY 6 i S 48V OC INPUT 1707C 1715C System Block Diagram ARCHITECT S and ENGINEER S SPECIFICATION The mixer power amplifier shall have six configurable ports and be capable of operating from 100 120 200 220 or 240 Vac 50 60 Hz line or from 48 VDC Eac
32. h port shall be usable with a microphone or other high level device The mixer power amplifier main frame shall include a compressor limiter low and high frequency shelving equalizers and a tone generator capable of producing general purpose and emergency warning signals The power amplifier shall meet the following perfor mance criteria Power Output 75 watts 1707C at less than 0 05 THD from 20 Hz to 20 kHz 8 Q direct output or 150 watts 1715C at less than 0 0596 THD from 20 Hz to 20 kHz 4 2 direct output Frequency Response 20 Hz to 20 kHz 1 dB direct output Source Impedance 150 Q to 250 Q nominal with a microphone preamplifier 600 Q with a bridging transformer 150 2 to 600 Q with a line matching transformer and greater than 30 kQ with a tape preamplifier Equivalent Input Noise 120 dBr with a low impedance microphone preamplifier Output Noise 85 dBm with all controls off The mixer power amplifier shall be rack mountable and finished in black The amplifier s dimensions shall be 514 H x 19 W x 12 D and its net weight shall be 24 2 lbs 1707C or 30 8 lbs 1715C The plug in accessory modules shall be the 1780A AT and the 1781A AT Input modules and the 1783 Line Output module The accessory transformers usable with the modules shall be the 1785A Input Isolation transformer and the 1786 Output Isolation transform er The connector subassemblies shall be the 1791 female XLR 1792 male XL
33. he two posi tion EQ IN DEFEAT slide switch to the EQ IN position Then adjust the BASS and TREBLE controls for the desired re sponse From a center or 12 00 o clock MID position rotate either control clock wise to boost response or counterclock wise to cut response If using the tone control section is inap propriate for current applications such as Acousta Voicing move the EQ IN DE FEAT slide switch to the DEFEAT position This disconnects the BASS and TREBLE controls To use the compressor limiter section follow this procedure Move the slide ON OFF switch to the ON position Rotate the RELEASE TIME control to its maximum position full clockwise Rotate the COMPRESSION RATIO con trol to minimum position full counter clockwise Rotate the THRESHOLD control to its 12 00 o clock MID position Begin increasing the compressor limiter bv rotating the COMPRESSION RATIO control clockwise until vou achieve the desired amount of compression or limiting Since the amount of compression or limiting depends on the incoming signal level you may need to readjust the THRESHOLD control To lower the trig gering threshold rotate the THRESHOLD control counterclockwise If the system re quires a higher incoming signal level to trigger the compressor limiter raise the threshold bv rotating the THRESHOLD control clockwise NOTE A high compression ratio and a low threshold setting may decrease the system s ap
34. input Module You can buy and install the following input modules from ALTEC LANSING The 1781A programmable input module The 1781AT programmable input module with 1785A input isolation transformer and The 1780A and 1780AT mic line input modules To initially set up an input module follow these steps 1 Rotate the input module s gain control to the 12 00 o clock MID position for plan ned microphone inputs or to the MIN fully counterclockwise position for line level inputs Ifthe input type is unknown rotate the gain control to the MIN position 2 Rotate the high cut HF filter to the FLAT position 3 Rotate the low cut LF filter to the FLAT position Initial Setup of an Output Module You can buy the 1783 line output module from ALTEC LANSING This module can be installed with or without the optional 1786 output isolation transformer also available from Altec Lansing To initially set up an output module rotate the output module s output level control labeled GAIN on the rear panel to the MIN position Initial Setup of the Mainframe 1 Rotate the MASTER output level control on the front panel of the mainframe to the co position fully counterclockwise 2 Setthe compressor limiter ON OFF switch to the OFF position 3 Setthetone control EQ IN DEFEAT switch to the DEFEAT position Operating the 1707C 1715C Mixer Power Amplifiers 1 Connect a source representative of the type of input sig
35. irect Output master at minimum Direct Output master at maximum Link Output Preamp Output Protection Systems Amplifter Load External DC Supply Mainframe Equalization Bass Treble 100 mVrms 10 kN 18 dBu 0 775 Vrms 10 kQ 0 dBu Reference 1 kHz 100 mVrms 18 dBu 2 kQ 0 dBm 600 2 min load 0 dBm 600 2 min load Unbalanced 24 5 Vrms 8 min load 24 5 Vrms 4 Q min load Balanced 17 4 Vrms 4 0 Q min load 25 0 Vrms 8 3 0 min load 70 7 Vrms 66 62 min load 25 0 Vrms 4 2 Q min load 34 6 Vrms 8 0 Q min load 70 7 Vrms 33 3 min load gt 40 20 Hz I kHz gt 105 dB below rated output power weighted gt 80 dB below rated output power weighted gt 75 dB below 100 mVrms output weighted gt 75 dB below 0 775 Vrms output A weighted EQ defeated compressor limiter off e Short circuit current limiting Over voltage limiting Thermal Sensing e Spurious oscillatory protection e Low AC line sensing e Output DC detection e Subsonic detection e Tum on tum off transients approx 3 seconds e DC input fuses e AC line fuse Shelving Tvpe 12 dB at 100 Hz 12 dB at 10 kHz Note 0 dBm into 600 2 vields 0 775 Vrms Compressor Limiter Threshold Compression Ratio Release Time Tone Generator Tones Control Level adjustment Connectors Inputs Amplifier Input Link input Batterv Outputs
36. irements Included Accessories FB1 4 FB2 IN Block Diagram of the 1780A 1780AT Input Module 300 Hz 12 dB octave 1 Gain continuously variable 2 5 oz 70 g 3 0 oz 85 g 18 VDC at 15 ma DC supplied bv mainframe 1 2 pin female jumper for phantom power 2 mounting screws for potentiometer bracket Operating Instructions 1781A 1781AT Description The Altec Lansing 1781A 1781AT Programmable Input modules accepts either mic or line level signals through a wide variety of connector inter faces Standard features include an electronically balanced input stage with adjustable gain continu ously variable high and low pass filters RFI protec tion 48 volt phantom powering two levels of muting and remote volume control capability Programming with plug in jumpers which may select phantom power on or off mute priority or slave or remote volume control The 1781AT module also comes equipped with a 1785A Input Isolation Transformer which provides an additional 10 dB of gain for improved sensitivity IN IN RIGHT CH LEFT CH GND Block Diagram of the 1781A 1781AT Input Module 1781A 1781AT Specifications Gain 1781A 0 dB 50 dB continuously variable 1781AT 10 dB 60 dB continuously variable Input Sensitivity Ref I kHz 10 kQ load 1781A 68 dBu to 18 dBu 0 3 mVrms 100 mVrms 1781AT 78 dBu to 28 dBu 0 1 mVrms 30 mVrms Input Impedance Ref 1 kHz Elec
37. nal to one of the input module positions if any Slowly rotate the input module s gain control clockwise un til the mixer power amplifier s green LED display 10 dB on the input level front panel section fully illuminates This is the nominal level for providing the most effi cient performance and headroom The mixer power amplifier s red LED dis play may briefly illuminate on signal peaks This is permissible as long as it does not flash more than fifty percent of the time If it does reduce the gain of the input module by rotating its gain control counterclockwise or use an external pad Figure 15 below displays the rear panel on the 1707C mixer power amplifier with numbers that point out each connector or control You can find the corresponding number and name description of each connector or control in the text below Figure 15 These connectors and controls are identical on the 1715C Figure 15 Rear Panel Control and Connectors for the 1707C c dd N x i Permits access to the screwdriver adjustable controls on the modules Access Holes Covers connector mounting holes Protects against internal voltages when not using port and connector Blank Cover Panel Combine two units together by connecting LINK OUT of system one to LINK IN of system two This is an RCA type phono connector LINK OUT Connector Provides a direct input to the amplifier This is an RCA type phono connecto
38. nd any options for future reference Write directly on the label with a permanent marker Referto Figure 6 for a display of this sample label INPUT INPUT QUTPUT NONE MUTE SLAVE PRIORITV XFORMER INPUT OUTPUT NONE MUTE SLAVE PRIORITV XFORMER OUTPUT NONE MUTE SLAVE PRIORITV XFORMER FRONT PANEL NOTE You may buy connector assemblies to use for installing additional input output modules from ALTEC LANSING INPUT OUTPUT NONE MUTE SLAVE PRIORITY XFORMER RVC INPUT OUTPUT NONE MUTE SLAVE PRIORITY XFORMEA INPUT OUTPUT NONE MUTE SLAVE PRIORIT Y XFORMER Phantom Figure 6 System Configuration Label SHELF OR RACK MOUNTING THE 1707C 1715C MIXER POWER AMPLIFIERS You may shelf mount or rack mount the main frame For shelf or countertop applications four rubber feet on the bottom of the chassis will protect resting surfaces and provide elevation for air flow underneath the unit For rack or cabinet applications remove the four rubber feet from the bottom of the chassis Then install the unit in the rack with the screws and shoulder washers provided The unit must have 1 75 of blank space both above and below it Ventiliation The mixer power amplifier generates minimal heat during normal use Although the amount of generated heat is low make sure the main frame is properly ventilated to prevent an ex cessive temperature rise Because the output power devices transistors
39. ne 48V DC battery power source 1 5 amps maximum for the 1707C and 3 amps for ihe 1715C Protects against excessive current drain from an alternating current source Replace only with same fuse type and power rating 14 AC FUSE The ground terminal lets you connect auxiliary equipment to the mainframe 15 GND 11 NOTE The LED display precedes each front panel input level control As a result it will always indicate the nominal and peak levels regardless of input channel settings Please refer to the mainframe block diagram shown in Figure 7 Once the gain is set for each input module channel rotate the front panel input level channel controls CH 1 6 on the mixer power amplifier to their 12 00 o clock MID position Slowly increase the MAS TER output level control on the front of the mainframe until you hear a normal operating level through the loudspeaker system Then readjust the input level channel controls slightly for the destred mix or blend of signals Adjust the high cut HF and low cut LF filters on the input module as needed for the desired response The widest possible bandwidth occurs when you rotate both of these controls to the FLAT position This is the best setting for music However in speech only channels you should limit the bandwidth to help reduce noise and system feedback To use the mixer power amplifier s output tone control section move t
40. nstall the appropriate fuse value from Table II Table Il AC Fuse Selection Chart AC Line Fuse AC Line Voltage 100V 1715C 7 0 A 250 V 7 0 A 250 V 4 0 A 250 V 4 0 A 250 V 4 0 A 250 V 1707C 3 5 A 250 V 3 5 A 250 V 2 0 A 250 V 2 0 A 250 V 2 0 A 250 V NOTE Use of fuses other than those listed in Table tl will VOID THE WARRANTY 6 If you connected the power transformer s primary leads for 200 220 or 240 volt operation perform steps 7 8 and 9 below to prevent future confusion and possible damage to the amplifier Otherwise pro ceed with step 10 below 7 Affix the supplied 220 240 VAC label above the power cord and cover the 120 VAC silkscreened designation 8 Affix the 2 amp fuse 1707C 4 amp 1715C label over the original 3 5 amp 1707C 7 amp 1715C silkscreened des ignation Refer to Figure 3 for where to place the fuse label Apply Fuse Label Here B N K Apply 220 240 Voltage Label Here Figure 3 Application of International Stickers 9 Replace the standard AC line fuse with the 2 amp fuse 1707C 4 amp 1715C supplied You should find the labels and the fuse enclosed in the plastic bag with this manual Refer to Table Il for an AC fuse selection chart 10 If you are not installing additional modules in the mainframe right now reinstall and secure the top cover with the nine screws previously removed in step 2 above NOTE You can buy and install ad
41. parent loudness since peak signals and parts of the nominal signal may lie above the threshold You can correct this by raising the threshold level just rotate the THRESHOLD control clockwise If you installed the 1783 line output module adjust the output level control on the 1783 for the desired output level The higher the output level the better the signal to noise ratio However too high a level reduces the available headroom and may cause premature clipping NOTE tf you set the 1783 3 output level con trol at its MAX full clockwise level the output level is 8dBm However this level only applies if you use a 100 mvrms reference level on the input of the output module from the mix output bus lt also only applies if you have a balanced 600 Q load 12 WARNING Repair performed by other than auth orized warranty stations dealers or qualified service personnel shall void the warranty period of this unit To avoid loss of warranty see your near est ALTEC LANSING authorized deal er You can also call ALTEC LANSING CUSTOMER SERVICE authorized deal er You can also call ALTEC LANSING CUSTOMER SERVICE directly at 405 324 5311 FAX 405 324 8981 or write 10500 W RENO OKLAHOMA CITY OK 73128 U S A ALTEC the sound of experrence 1707C 1715C MIXER POWER AMPLIFIERS SERVICE INSTRUCTIONS xxx CAUTION No user serviceable parts are inside you may en counter haz
42. put mixer with a fully protected power amplifier in one con venient cost effective package The six input ports accept any of the several input modules or output module The programmable input modules may have their muting circuitry configured in either priority slave mode or may be set to ignore muting commands When a module configured in the Priority mode is activated modules in the slave mode will be muted Circuitry is also provided to allow remote volume control of individual inputs Multiple mainframes may be dynamically linked together Separate preamp out and amplifier in jacks allow the insertion of equalizers or other signal processing between the mixer and the power amplifier A multi tone generator and a compressor limiter are also provided Continuous Average Power 1707C 1715C Maximum Midband Output Power 1707C 1715C Power Bandwidth Direct Output Transformer Output Frequency Response Direct Output Transformer Output Link Output Preamp Output Specifications Input Sensitivity Input Impedance 75 watts 150 watts Reference 1 kHz at 196 THD 100 watts 175 watts Ref 1 kHz at rated output power better than 20 Hz 20 kHz better than 50 Hz 15 kHz 1 dB 20 Hz 20 kHz Ref 1 kHz 1 watt output 1 5 dB 50 Hz 15 kHz Ref 1 kHz 1 watt output 1dB 20 Hz 20 kHz Ref 1 kHz 100 mVrms 10 kQ load 1dB 20 Hz 20 kHz Ref 1 kHz 0 dBm
43. r ref 1 kHz 100 mvrms LINK IN Connector PREAMP OUT Connector Use to patch auxiliary equipment between unit s mixer and power amplifier PREAMP OUT is normally strapped to AMP IN The PREAMP OUT connector precedes the front panel MASTER level control This is an RCA type phono connector AMP IN Connector Provides a direct input to the amplifier This is an RCA type phono connector ref 1 kHz 775 mvrms Provides an auxiliary output of the signal appearing at the amplifier s input This is an RCA type phono connector AUX OUT Connector Permits connection of external switches to operate the system s mute and tone generator circuits Seven Lug Screw Terminal Connector OUTPUT LEVEL Control Increase the output level of the tone generator by rotating the screwdriver slotted control shaft clockwise To decrease the output level rotate it counterclockwise Permits connection of various loads to the amplifier Seven Terminal Barrier Strip Connector U Shorting Strip Connects output of amplifier to input of output transformer When in place use only the transformer outputs Protects load against excessive current from amplifier Replace only with the same fuse type and power rating OUTPUT FUSE Battery Input Connector Use to power system from battery supply for auxiliary operation or standby switchover Requires o
44. tput of the mixer power amplifier 8 Q for the 1707C 4 Q for the 1715C 3 Attach RED probe lead from the DC voltmeter to the junction of R130 0 27 Q emiter resistor and the emitter of Q117 Refer to figure 16 4 Attach the BLACK probe lead to the junc tion of R130 0 27 2 emitter resistor and the anode of D403 5 Locate SVR102 on the main circuit board Apply power and adjust SVR102 for a reading of approximately 5 5 millivolts Power Amplifier DC Offset Adjustment NOTE This adjustment requires a DC volt meter 1 Set the POWER switch to the OFF posi tion Rotate the MASTER level control fully counterclockwise to the e position 2 Connectthe rated load impedance for the unit to the direct output 8 O for the 1707C 4 Q for the 1715C Connect the DC volt meter across the load 3 Locate SVR101 on the main circuit board Apply power and adjust SVR101 for a reading of 0 00 VDC 10mV DC 14 Parts Ordering To order replacement parts refer to the parts list If part is not included on parts list note the component designator from the schem atic or printed circuit board and the com ponent s description Then call 405 324 5311 FAX 405 324 8981 or write ALTEC LANSING Replacement Electronic Parts P O Box 26105 Oklahoma Citv OK 73126 0105 U S A Factorv Service If the unit requires factorv service ship the unit prepaid in the original carton or a well packed carton to the following
45. tronically balanced gt 8 k0 Transformer balanced 200 Q 600 Q With 1793 Dual Phono Connector Installed gt 39 kN Ref 1 kHz 100 mVrms output 10 kf load Frequency Response 17814 X dB minimum gain 20 Hz 20 kHz 1 dB maximum gain 50 Hz 20 kHz 1781AT 1 dB minimum gain 20 Hz 20 kHz 1 dB maximum gain 90 Hz 15 kHz Total Harmonic Distortion THD 20 Hz 20 kHz Equivalent Input Noise High Pass Filter Low Cut Comer Frequency Slope Low Pass Filter High Cut Comer Frequency Slope Attenuation Mute Ref 1 kHz 100 mVrms output minimum gain 10 kN load 30 kHz low pass filter lt 0 03 Ref 0 dBr 100 mVrms output 10 kM load 200 Q input termination maximum gain A weighted lt 120 dBr Ref 100 mVrms output minimum gain 10 kf load 320 Hz gt 10 dB at 100 Hz 6 dB oct 20 dB dec Ref 100 mVrms output minimum gain 10 kQ load 5 kHz gt 6 dB at 10 kHz 6 dB oct 20 dB dec Ref 100 mVrms output minimum gain 10 kQ load gt 60 dB 10 k 2 remote 1783 Description The Altec Lansing 1783 Line Output modules pro vides the drive capability necessary to interface with other professional equipment The electroni cally balanced output stage provides a low source impedance to drive subsequent stages If trans former isolation is necessary the module s circuit board accomodates the optional PC mount 1786 Output Isolation Transformer
46. uously variable potentiometer Determines the amount of limiting that will occur when the input signal level exceeds the threshold as set by the THRESHOLD control COMPRESSION RATIO Control Places compressor limiter circuit in or out of the signal path OUTPUT Continuously variable potentiometer Provides boost or cut in bass response You can obtain normal or flat response at a zero setting Rotate clockwise to boost response or counterclockwise to cut response ON OFF Switch W BASS Control Continuously variable potentiometer Provides boost or cut in treble response You can obtain normal or flat response at a zero setting Rotate clockwise to boost response or counterclockwise to cut response TREBLE Control BASS and TREBLE controls when appropriate for application such as Acousta Voicing EQ IN connects the BASS and TREBLE controls MASTER Level Control Continuously variable potentiometer graduated from to O dB Use it to simultaneously increase or de crease all input channels Rotate clockwise to increase 7 10 11 EQ IN DEFEAT Switch Two position switch DEFEAT position disconnects 12 level or counterclockwise to decrease level 13 CLIP LED Indicator Illuminates when an internal signal overload circuit detects high output signal levels that may cause output clipping 10 INITIAL SETUP AND OPERATION OF MAINFRAME WITH MODULES INSTALLED Initial Setup of an
47. ure 13 Battery Input Connections FRONT REAR PANELS CONTROLS SWITCHES INDICATORS AND CONNECTORS Figure 14 below displays the front panel on the 1707C mixer power amplifier with numbers that point out each control indicator and switch You can find the corresponding number and name description of each control switch or indicator in the text below Figure 14 These controls indicators and switches are identical on the 1715C Figure 14 Front Panel Control Switches and Indicators for the 1707C NT item Name Function Description 1 POWER Switch Applies primary power Two positton push push switch for on off mode illuminates red display on POWER switch when you turn on power INPUTS Continuously variable potentiometers graduated from to O dB You can increase or decrease level for each corresponding input channel Rotate clockwise to increase level and counterclockwise to decrease level INPUT LEVEL Displays nominal green and peak red indication for each channel COMPRESSOR LIMITER Continuously variable potentiometer Determines the level at which limiting begins 2 ON LED Indicator CH 1 6 Controls 4 Green Red Dual LED indicators 5 THRESHOLD Control Continuously variable potentiometer Determines the time required for the system to return to normal after signal falls below threshold 6 RELEASE TIME Control Contin
48. utput Connections Insert shorting bar Figure 9 Transformer Output Connections To use a transformer balanced output install a U shorting bar between the direct out put and the output transformer s input OT IN NOTE When using the output transformer you may use any combination of output connections as long as the total con nected load does not consume more than 75 watts for the 1707C or 150 watts for the 1715C Output Fuse A fuse in series with the output ofthe amplifier section protects the amplifier from excessive current consumption by a load If this output fuse blows replace it only with a fuse that matches the same type and rating as silkscreened on the rear panel of the unit If the fuse continues to blow check the load to see if it shorted or is exceeding the rated power consumption If the problem continues have a qualified service technician service the unit Mute Tone Generator Connections The seven lug screw terminal connector lo cated on the mid left rear of the mainframe provides access to the system mute and tone generator For connection details refer to Figure 10 S T BUZZER External SPST switches not included with mainframe Figure 10 Mute Tone Generator Switch Connections A switch closure between the mute and common COM terminals will mute any input modules configured in the s ave mode You can use the remaining switches to select one of the following soun
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