Altec Lansing 9441A User's Manual
Contents
1. KA NW Eh ex tie sound of experrence 9441A Anniversary Series Power Amplifier Operating and Service Instructions ALTEC LANSING CORPORATION n MARK IV company P O Box 26105 e Oklahoma City OK e 73126 0105 USA e Tel 405 324 5311 e FAX 405 324 555 Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier Table of Contents 2 ENSPAERATON sen Sask kem Elite sod wouv Rika Vee kle w ple SSE Se Nace ele SIRE Dae wh SWA SS ie on ZA Retk MounllBg von acs nace raw sls sz Mig Wek HE OG OG Tels BSW ES EGE Wee sit HSS ske ja kl BIEN 2 2 WEDHIADIOR loan wat winds DT pies AME poate GRE Se PSE Kek Sow xe von NE kn SEN Be Eee 3 SIGNAL CONNECTIONS lil ere nies ona w en e ace arete Lem ape vous nm qre wage umm ee eu n a 3 1 Input Connections sess sce srs w mwa sies ave M e a Ta nA ON AU RTC TLE oer e EI e EIE M E 3 9 9 4 Output Coure eu care Hare son ne xk KOS Qn Xo rix GEYA ossi S Wand SMS pis Al t WORSE d wate FO Otput Cable S lechon ve usos aka w kl naa ava w pl Mi SN MIWA AZA ri ZRH Erst Pia cle cw V RS W kte Won 3 4 1 Caleulating Power Losses with 8 ohm Loads ara Kasi PA eee 3 42 Calculating Power Losses with 4ohm Loads Wii aaa rig sa akay sati avi ama ma Pad lane Ka ao 2 0 WARPING R ebtor l2 lu naa Wani lw doz a nom Worla Pe nA Few SH KOR Bare Dus Ways WG WSK E ans 3 6 1 Caleulating the Seta Length of2. Dual mode 8 N 1 kHz 2 100 Crosstalk 55 dBr Ref 1 kHz 0 dBr rated output power ini ohms single channel operating Noise 2100 dB Below rated output power A weighting filicr 8 0 dual mode 50 60 Hz ac line frequency ALTEC LANSING CORPORATION e a Mark IV Company E Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier Amplifier Protection Load Protection Cooling Heatsink Output Topology Output Type Dual mode Bridge mode Output Devices Total number Pdmax rating Veem lc Tjmax Controls and Switches Front Rear Front Panel Indicators Connections Input Output Power Fuse Type Power Requirements Shorted output term inals Over temperature RF interference Startup shutdown trans ients DC faults Sub sonic signals Conventional heatsink True complementary symmetry Unbalanced each chan nel Balanced 4 devices 130 watts 180 volts DC 15 amps DC 150 C Two input level controls Power switch Mode switch Power LED Clip LED x 2 Protect LED A phone x 2 Female XLR x 2 Oclal accessory socket x 2 powered with 15 volts DC at 25 ma Barrier strip 6 ft 1 83 m 8 wire 18 GA power cord with NEMA 5 15 plug IEC T 4 A 250 V Slo Blo or equivalent for 120 Vac use 120 Vae 50 60Hz 300 watts configurable to 220 240 Vac 100 Vac 50 60 Hz model avail able Operating
3. xe ems mer 203 CA 4T S nTERE G Deh 18 cnr l 8 ki B8 REP joc o g ae Pe eee s a 7 f tatr ki 42 wu NOTICE UNLESS THEPWISE SPECIFED ALl RESISTIRS ARE l w t 5 5 CAPACITOWS ARE IM uF ZVOLTS 2 DH YAAAQMARRED RESSTURS ARE nT ANE THE FCP ON SLEEVES 4 00000000 Seecificctians ore aeger ge chang 9T alice Figure 7 Schematic of 9441A Sheet 2 of 2 ALTEC LANSING CORPORATION a Mark IV Company 13 Operating and Service Instructions for the Altee Lansing 9441A Power Amplifier Reference Designator R01 R02 R101 R102 R03 R103 R04 07 R104 107 ROS R108 R09 R109 R10 R110 R11 R25 Rit R125 Ri2 R44 R45 R47 R51 R112 R144 R145 R147 R151 R208 R18 R113 R14 R30 R114 R130 R15 R18 R115 R118 R16 R19 R116 R119 R17 R28 R32 R117 R128 R132 R20 R38 R120 R133 R21 R121 R22 R122 R23 R123 R24 R124 R26 R27 R127 R202 R206 R207 R29 R129 R31 R131 R34 R134 R35 R36 R135 R136 R37 R38 R137 R138 R39 R48 R189 R143 R40 R140 R41 R141 R42 R142 R46 R56 R146 R152 R48 R58 R148 R49 R50 53 R59 R149 R150 R54 RoS R57 R63 R126 R154 R183 R201 R204 R205 R208 R208 R210 R211 R212 R213 C01 C04 C19 C101 C104 C119 C02 C08 C102 C103 C05 C105 Ordering Number 47 03 121532 47 05 122803 47 03 028238 41 03 037660 47 01 0
4. C124 C25 C125 C26 C27 C28 C201 C202 C203 C204 C205 C206 C207 L01 L101 D t DOS DOG D101 D105 D106 D02 D04 D102 D104 D107 D202 D203 D03 D108 D201 D204 D205 IC01 IC101 IC02 Q01 03 Q17 Q101 103 Q117 Q04 Q05 Q08 Q16 Q104 Ordering Number 15 06 038041 15 06 038042 15 02 038043 15 01 038002 15 01 038044 15 02 038006 15 01 037997 15 01 038045 15 01 038046 15 01 038047 15 01 038048 15 01 638049 15 01 038050 15 01 038005 15 01 038001 15 01 038000 15 01 038051 56 01 038052 48 01 038053 48 02 042787 48 01 122601 48 02 037985 48 01 037984 A RO TTIZZ2832Z 17 01 124804 48 03 026634 48 03 124824 Name and Description Capacitor 680 pF 100 volt 546 polypropylene Capacitor 200 pF 100 volt 5 polypropylene Capacitor 10 pF 200 volt 5 ceramic Capacitor 47 pF 63 VDC electrolytic Capacitor 22 uF 25 VDC electrolytic B P Capacitor 30 pF 200 volt 5 ceramic Capacitor 4 7 pF 50 VDC electrolytic Capacitor 4 7 uF 50 VDC electrolytic B P Capacitor 100 pF 100 VDC electrolytic Capacitor 0 22 pF 100 VDC electrolytic Capacitor 47 pF 50 VDC electrolytic Capacitor 22 pF 50 VDC electrolytic Capacitor 47 pF 50 VDC electrolytic Capacitor 1000 pF 63 VDC electrolytic Capacitor 47 pF 16 VDC electrolytic Capacitor 22 pF 16 VDC electrolytic Capacitor 1 uF 50 VDC electrolytic Inductor 0 7 pF coil Diode 15155 switching
5. Cable for a Specified p Factor 5 nu esos 3 6 i Pr ie ff Speaker Profection Buse Selection scp S Gh kat oui KAN epee pan cues mwenn eT Be a RGF HOS v Compression Driver Protection Capacitors ep sa once eem ave e me mepe tee ene mme m 4 OCTAL ACCESSORY SOCKETS A eae nr E ILL an 5 PROTECTION SYSTEMS ss ki noanoa ae Bae Moi Rex ane OTE sakle Ra RO S Hee XXX ete Hee d 7 0 2 Oe Load Protection Circuitry GZS kou css eleve BOWE Al ec Us GOT pili WAN SOS kak kose STANA S Ampliner Protection Girembtry sw 0 cau ci Sete OES SON OR GEN Hew de W E Hee Du ES i Luc EI Protect Indicalok a 2 22 212 2x 2x2 wi U zca ainm NIS Wave Ma DA vie Eia GAD ANA Rd GUTES NUR NA x 6 OPERATION e RE a RE m eee n A SORRY FA 0 1 6 2 Doa Mode e Om dE Eu acres cree ne ace fy TU A ET UU ESI RR E SEIN Bricve Mede Opera uei ccs Slee X ROUEN EDEN OX pan SIRES ed ALEGE EAE RES E Rai T IN CASE OPPROBLEMIS cco rev asosi iu wen ase sbade xXx E rox laa xD X r sede wen Grete BSS Et wet 3 5 SPECHIGATION uua ose mmm ae IR Um an A BENE eve sis mca is Wea te ESE CY a ao ZS Have HE ki RO gt SERVICE INFORMATION ocu zs 225 Sk EEG Xx VAR ER S N na a Bole Sew Ua Cu i 2 Ss Wan 9 1 9 2 9 3 9 4 9 5 A CAP DU Neosded i Vu t CE E Adjusting SVRI and SVR2 the BIAS Tetapots T Ordering Replacement Parts TENERE NEN PO pe a alias Wiens a
6. Diode LN4004 rectifier Diode 1N4148 switching Diode KBPC15 04 bridge Zener Diode 15 volt 0 5 watt IC NJM 55328 gt LL PF 039609 IC TA 7317P Transistor 28A 970 GR PNP Transistor 25C 2240 GR NPN k Q105 Q108 Q116 Q118 Q06 Q09 Q106 Q109 Q07 Q10 Q107 Q110 48 03 038054 Transistor 2SC 2285 Y NPN 48 08 037237 Transistor 28A 965 Y PNP Q11 Q111 Q12 Q112 Q03 Q04 Q103 Q104 48 03 088055 48 03 038056 48 03 026634 Transistor 25C 4381 Y NPN Transistor 28C 3519 Y NPN Transistor 28A 970 GR PNP Q13 Q113 48 03 038057 Transistor ZSA 1667 Y PNP Qi4 Q114 48 03 038058 Transistor 25A 1386 Y PNP Q15 Q115 48 03 037983 Transistor 28C 2229 Y NPN 3201 A8 08 124892 Transistor KTC 2238A Y NPN Q202 48 03 037236 Transistor KTA 968 Y PNP 53 02 038017 Thermister NTC B57384 5209 M TSI 1S2 53 01 038061 Thermal switch LION 56 08 038059 Transformer 9441A UB FI 51 04 038060 Fuse T4 amp 250 volt SB UL GLS SW1 51 02 0388066 Switch power H 8650 VB 250V 10A SW2 53 01 038061 Switch bridge 5522F22 G9 VRO1 VER101 47 01 038063 Potentiometer volume 18PN01 C41 155K A5E a E HUM w T Y M ALTEC LANSING CORPORATION 9 a Mark IV Company 15 Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier Reference Ordering l D
7. Se PE C CLTI IC Kantory BOUWICE Yen kris EE ken kou e EET Kb RGB ROX EIE PONN OR ERES SAY RJ RT HES apa TO Tecinical ASSISTANCE s won man siss vie Si ku anal aleka vie yo FI BOSS Gee die SUEDE ese EUR WISTS Wis ESS aveni ALTEC LANSING CORPORATION e a Mark IV Compariy ei EA Reb ed Oo Ca ba bo bi bi k hobo bi Cm C C 16 11 1l 11 il Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier 1 ELECTRICAL Two amplifier models are available One model has a 50 60 Hz power transformer with two 120 V ac primary windings These windings may be wired in parallel or series for operation at either 120 V ac or 220 240 V ac The other amplifier model is for export into countries where the ac line voltage is 100 volts 50 60 Hz The next two sections refer to the first model with the dual 120 V ae pri mary windings 1 1 120 V ac 50 60 Hz Power Connections The amplifier is provided wilh the primary of the power transformer strapped for 120 V ac operation from the factory Refer to Figure 2 for the wiring details WARNING Veri y that the power transformers primary circuit con figuration is correct for the in tended ac line voltage BEFORE applying power to the amplifier 12 220 240 V ae 50 60 Hz Power Connections The power transformer has two 120 volt primary windings which ean be connected in parallel for 120 V ac line voltages or in series to meet 220 240 V ac re quirements Use
8. pro tect loudspeaker systems or the amplifier It is difficult however to determine Lhe proper fuse value with the correct time lag and overload characteristics t match the limitations of a speaker sys tem The values shown in Table II should serve only as a guide To use determine the power rating and load value Then select a standard value fuse of the next smaller value to the one listed in the table The values are calculated for fast blow fuses which carry 135 of their current raling for an hour but will blow within l second at 200 Other fuse values may be calculated for different power levels from the following equation Fuse value Pout x ZL amps ZL x 1 85 where Pout is the output power rating of the amplifier and ZL is the load impedance Use 32 volt fuses if possible they typically have the lowest internal resistance which will help mini mize deterioration of the damping factor at the load Refer to the example in Figure 4 Table II Caleulated Output Fuse Values Power 4 1 A 1 16 1 walls Load Lond Load 160 330 X 2 62 1 85 3 21 2 27 370 2 62 454 321 524 3 70 G42 454 3 7 Compression Driver Protection Capacitors Compression drivers used for mid to high frequency sound reproduction are much more sus ceptible to damage from low fre quencies than large cone loud speakers Even though an eleg tronie crossover may be employed problems may arise in t
9. the following procedures to re strap the primary of the power transformer for 220 240 V ac applications iJ Make sure the amplifier is not connected to any power source 2 Remove and save the ten screws securing the top cover Refer to Figure 1 for the exact screw loca tions 3 Locate terminal block TB1 located behind the AC main power switch Re connect the leads as shown in Figure 2 REMOVE TWO SCEWS BOTH SIDES Figure 1 Top Cover Removal 4 Install the top cover with the ten screws previously removed b Install the 2 0A fuse T2 0A 250V slo blo or equivalent 6 Install the 230 Vac 50 60Hz and the F2 0A 250V decals in the proper positions 2 INSTALLATION 2 1 Rack Mounting The amplifier may be in stalled in a standard 19 inch equipment rack It requires 1 75 inches of vertical rack space and secures to the rack cabinet with the four rack mount screws and cup washers provided in the hard ware kit 2 2 Ventilation The amplifier must be adequately ventilated bo nvoid ex cessive temperature rise should not be used in areas where the ambient temperature exceeds 50 C 122 F To determine lho ambi ent air temperature operate the system in the rack until ihe tem perature stabilizes Measure the ambient air with a bulb type ther mometer held at the bottom of the uppermost amplifier Do not let the thermometer touch Lhe metal chassis because the chassis will be hotte
10. 28011 47 01 028580 47 01 102072 47 01 102106 4 1 08 0282T4 47 01 102112 47 01 102080 47 01 102054 47 08 028030 47 03 028694 47 03 038031 47 03 122953 4 08 038032 47 01 102085 47 01 102111 4 01 102102 47 01 102110 47 01 102129 47 01 038033 47 Q01 038034 4 1 01 037992 47 01 038035 47 01 038036 47 01 102098 47 01 102094 47 01 102 119 47 01 102114 47 01 102121 47 01 1070483 47 01 102109 47 01 102108 47 01 038038 47 01 102082 47 01 102127 47 01 124444 7 01 102066 47 01 102046 47 01 113781 15 06 037215 15 02 038039 15 01 088040 Component Parts Listing for the 9441A Name and Description Resistor 1 0 KO 0 25 watt 1 metal film Resistor 10 0 0 25 watt 1 metal film Resistor 15 0 KA 0 25 watt 1 metal film Resistor 3 32 kQ 0 25 watt 1 metal film Resistor 240 kf 0 25 watt 5 metal film Resistor 80 k0 0 25 watt 5 metal film Resistor 560 0 0 25 watt 5 metal film Resistor 15 KO 0 25 watt 5 metal film Resistor 89 2 KO 0 25 watt 1 metal film Resistor 27 KO 0 25 watt 5 metal film Resistor 1 2 KA 0 25 watt 5 metal film Resistor 100 Q 0 25 wati 5 metal film Resistor 91 11 0 25 watt 1 metal film Resistor 150 0 25 watt 1 metal film Resistor 47 KO 0 25 watt 1 metal film Resistor 22 1 KA 0 25 watt 1 metal film Resistor 820 Q 0 25 watt 1 metal film Resistor 2 KO 0 25 watt 596 metal film Resistor 24 kO 0 25 watt 5 metal film Res
11. EE SNO Zo is the amplifier s ont OO ai i put impedance 0 08 ohms i LONG CABLE RUN for the 9441A SHORT CABLE RUNS N SMALL GUAGE WIRE DF is the minimum per ini rai missible damping factor at YO 2 the load and 70 100 440 E DCR ft is the DC resis 7 OR 210 VOLTS tance of the 2 wire cable 7 J per foot from Table I STEP DOWN AE yn The same equation can be used to caleulate the maximum cable length in meters by substituting the DCR per meter value from Figure 5 High voltage Distribution System Table I Sometimes it may be necessary to The maximum length o wire Let s use Lhe equation Suppose locate the speaker 100 feet or cable in this situation be ZL equals 8 ohms Zo 0 08 more away from the amplifier In approximated from the following ohms and the minimum damping this situation a much larger equation factor at the load is 25 In addi gauge cable is required However tion 18 GA cable is preferred this may not be practical or eco Max Length of 2 wire cable in Then the maximum length of 18 nomical The size of the 2 wire feet GA cable which can be used to cable can be greatly reduced by achieve a damping factor of 25 at stepping up the output voltage of Ve 1 Zo the load is the amplifier to 70 100 140 or Pout DCR ft DF 7 210 voli using an output trans 8 0 08 former then stepping down the where 2D 18 4 feet voltage at the load Such a system V is the
12. IVER PROTECTION CAP iL at a ki Em AUX OUTPUTS USER OPTIONS BARRIER STRIP i lr T BAL l Ju OUTPUT fp SINGLE ENDED AUX OUTPUT BARRIER STRIP s HOT e KEEP GNO pj E COM CABLE x RUNS d e UNDER BARRIER STRIP NES n 6 ft HOT OR 2 m COM LGUDSPEAKEA LOADS 1 STEREO DUAL FULL RANGE OPERATION BI AMP sasi SYSTEM COMPRESSION DRIVER HIGH POWER FULL RANGE SUBWOOFER Figure 4 Typical Output Connections to control unwanted speaker cone movements When a signal drives a woofer current flowing through the voice coil creates a magnetic field This field interacts with the permanent magnetic field in the gap and forces the combination cone and voice coil assembly to move outward When the signal is removed the assembly moves inward but its momentium ses it to overshoot its resting point This overshoot will dampen itself out eventually but the unwanted movements can add cons erable distortion products to the sound In the process of moving inward through the magnetic eld the voice coil assembly genemitos a current of opposite polarity to the original signal This curren in duces a voltage or back OMF which travels through the speaker wire to the amplifier s output The lower the amplifier s output impedance the faster over shoot of the voice coil wil vatnpen out The output impedance of an amplifier can be calculated by
13. ac Voltage Range Power Consumption Heat Produced Operates from line voltages as low nas 90 volts at reduced output power assuming 120 V ac nominal line Both channels operating in dual mode wil kHz sinewave input signal at stated output power into 4 A loads idle 1 8th max midband power 1 3rd max midband power Rated output power Max midband power Operating Temperature Range 30 watts 0 102 kE TU 270 watts 0 833 k BTU h 390 watts 1 099 ki TU 600 watts 1 860 ki TU h 730 watts 1 496 k TU Up to 50 C ambient 129 T Dimensions Rear of rack ears to max depth Shipping Weight Net Weight Color Enclosure Standard Accessories 135 in H x 19 in W x 12 8 in D 4 44 em H x 48 26 cm W x 32 51 em D 22 lbs 9 97 kg 18 Ibs 8 16 kg Black Rack mount chassis 16 GA steel 3 16 in 5052 aluminum alloy front panel 4 U jumper plugs for octal sockets 2 per socket installe 1 Operating nsiruct ions and Service Manual 1 T2 A 250 V fuse for 220 240 V ac use 8 ALTEC LANSING CORPORATION 9 a Mark IV Company Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier Optional Aecessories 2A Power Limiter former The xxx represents various corner frequencies 15A Input Bridging available for the corresponding filter Z Et Rs Transformer with Pad iS Q 7 15170 100 watt Auto Note The 14712A and the 15581A wil
14. al mode 8 1 Bridge mode 16 N 2115 watts ch 2220 walts gt B0 watts ch 155 watts Ref 1 kHz 1 THD 2100 volts ae 17 sag Dual mode 4 0 Bridge mode 8 a Dual mode 8 Q Bridge mode 16 A Headroom Before clip gt 95 watts ch gt 185 watts gt TO watts ch gt 135 watts gt 1dB Ref 1 kHz 1 THD single channel mode Frequency Response 10 Hz 50 kHz Ref 1 kHz 1 watt output 0 3 dB Power Bandwidth 20 Hz 20 kHz Ref 1 KHz 0 1 dBr where 0 dBr rated output power in any mode Voltage Gain Ref 1 kHz Dual mode 4 0O 28dB Dual mode 8 O 30dB Bridge mode 8 34 dB Bridge mode 16 0 36 dB Input Sensitivity for Rated Output Power Ref 1 kHz 0 5 dB Dual mode 4 0 Bridge mode 8 Dual mode 8 2 Bridge mode 16 A 0 dBu 0 774 V rms 0 25 dBu 0 752 V rms 1 0 dBu 0 869 V rms 1 0 dBu 0 869 V rms Maximum Input Level 20 dBu 7 75 V rms Ref 1 kHz Input Impedance Ref 1 kHz Balanced 30 kD Unbalanced 15 ki Polarity Positive going signal applied to pin 2 ot ALR or of 14 phone tip produces positive going signal at ow anal terminal Phase Response Any mode 20 Hz 25 20 kHz 2 25 THD 0 196 Typ 0 05 70 Any mode 30 kHz measurement bandwidth IMD SMPTE 4 1 lt 0 1 Any mode Slew Rate Dual mode 4 or 8 A gt 19 V ysec Bridge mode 8 or 16 0 gt 37 V ysec Damping Factor
15. alers or qualified personnel shall void the warranty period of this unit To avoid loss of warranty see your neares Altec Lansing authorized dealer or call Altec Lansing Customer Service directly at 405 324 5311 FAX 405 324 8981 or wrile Altec Lansing Customer Service Repair 10500 W Reno Oklahoma City OK 73125 U S A G ALTEC LANSING CORPORATION a Mark IV Company Operating and Service Insiructions for the Altec Lansing 9441A Power Amplifier 8 SPECIFICATIONS Conditions 1 0 dBu 0 778 volts rms 2 Dual mode ratings are for each channel 3 Both channels operating at rated output power unless noted 4 120 volt ac line input voltage maintained for all tests unless noted Continuous Rated Output Power 20 Hz 20 kHz at less than 0 1 THD Dual mode 4 4 Bridge made 8 2 Dual mode 8 A Bridge mode 16 A 100 watts ch 200 watts 75 walts ch 150 watts Continuous Rated Output Power to Subwoofer 20 Hz 1 kHz at less than 0 1 THD Dual mode 4 0 Bridge mode 8 4 Dual mode 8 2 Bridge mode 16 0 130 watts ch 260 watts 95 watts ch 180 watts Maximum Midband Output Power Ref 1 kHz 1 THD 2120 volts ac line voltage Dual mode 4 N Bridge mode 8 2 Dual mode 8 1 Bridge mode 16 Q0 gt 145 watts ch gt 270 watts gt 100 watts ch 200 watts Ref 1 kHz 1 THD 2108 volls ac 10 sag Dual mode 4 O Bridge mode 8 0 Du
16. dividing the rated output Hnped ance typically 8 ohms by the damping factor The 94414 hasa damping factor rating ot 100 which corresponds to an output impedance of 0 08 olims 3 5 1 Calculating the Maximum Lengih of Cable for a Snenified Damping Factor Spec ification at the Load The damping factor raling is typically never realiz l al the load because of the resistunce of the cable and other factors such as the contact resistance of an output relay or the resistance of an output fuse The damping fac tor at the load should be 30 for general paging systems and 50 for high fidelity musie systems Econ omics usually dictate however that these numbers are cul in half The resulting damping factor at the load should be based on ex perience and customer satis faction Once a minimum demping factor is determined for a partic ular type of installation e fol lowing equation can calculate the maximum length of 2 wire cable which can be used to achicye the minimum damping factor specified at the load ALTEC LANSING CORPORATION 9 a Mark IV Company 3 Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier Max Length of 2 wire cable in feet ZL Zo A DF POWER AMPLIFIER DCR ft C STEP UP TRANSFORMER 35 j where 1Npur BRIDGE l 70 100 140 ji ZL is the load impedance MODE OF 2 OR 240 VOLTS H OPERATION e to connect to the amp Ne WE E ra
17. dule making sure the key on ifs center post aligns with the groove iin the female socket For operation refer to the instructions provided with the module Schematically the module will be inserted Sel ween the input connector and lhe bal anced input stage Electronic mod les are powered from a bipolar 18 volt supply in the amplifier The supply 1s capable of supplying up to 25 ma DC of current Currents in excess of 25 ma DC may prevent the amp lifier from disengaging rom its built in protection mechan sms 5 PROTECTION SYS TEMS 5 1 Load Protection Circuitry Each channel indesend ently protects its load from startup shutdown transients DC and large subsonic signals 5 2 Amplifier Protection Circuitry A unique curreni ling circuit was designed specitically for the amplifier It features a variable current limit which is a ALTEC LANSING CORPORATION 9 a Mark IV Company 5 Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier function of the output signal vol tage As a result the amplifier can deliver the rated currents into rated loads but substantially limits the current into low imped ance cr shorted loads shorted output terminals Once the short is removed however the amplifier will resume normal operation The heatsink is conventionally cooled Should the heatsink temperature of a channel remain excessively high both channels wil shut down automat
18. esignator Number Name and Description VR02 VR102 47 06 038064 Potentiometer bias 4227 BIK 45 01 038065 Relay AW 8812 LED 01 101 102 201 48 04 038018 L E D KLR 124 3 mm 21 083 038019 Dual Binding Post TB 301D RED Black 98 13 026422 Hardware rack mount 21 01 013567 Jumper Octal Socket gold flash 18 ALTEC LANSING CORPORATION 9 a Mark IV Company Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier ADDENDUM TO THE ALTEC LANSING 9441A M nd OPERATING AND SERVICE INSTRUCTIONS The following is a change to the Electrical Instructions of the Altec Lansing 9441A Power Amplifier found on pages 1 and 2 of the Operating and Service Instructions Part Number 42 02 037980 1 2 220 240 V ac 50 60 Hz Power Connections The power transformer has two 120 volt primary windings which can be connected in parallel for 120 V ac line voltages or in series to meet 220 240 V ac requirements Use the following procedures to re strap the primary of the power transformer for 220 240 V ac applications 1 Make sure the amplifier is not connected to any power source 2 Remove and save the ten screws securing the top cover Refer to Figure 1 for the exact screw locuLions 3 Locate terminal block TB1 located behind the AC main power switch Reconnect the leads as shown in Figure 2 4 Install the top cover with the t n screws previously removed 5 Install the 2 04 fuso T2 0A 250V slo blo or equivale
19. ews se curing the top cover Refer to Figure 1 for the screw locations 9 Channel l Locate the junction of Q12 s emitter and R37 Connect the pos ilive side of the digital DC volt meter to the junction of Q12 s emitter and R37 Then locate the junction of Q14 s emitter and R38 Connect the negative side of ihe digital DC volt meter to the junction of Q14 s emitter and R38 Connect the unit to its power source and turn the power on Adjust VRO2 so that the digital DC volt meter reads 7 milli volts DC 2 mVdce Turn power off and disconnect the unit from its power source Note Adjust Bias im medialely after turning power on 4 Channel 2 Locate the junction of Q112 s emitter and K137 Connect the positive side of the digital DC volt meter to the junction of Q112 s emitter and R137 Then locate the junction of Q114 s emitter and R138 Connect the negative side of the digital DC volt meter to the junction of 114 s emitter and R138 Connect the unit to its power source and turn the power on Adjusi Vv 102 so that the digital DC volt meter reads 7 milli volts DC 2 mVdeh Turn power off and disconnect the unit from its power source Note Adjust Diss ime mediately after power on ELU rang 9 He install the lo Cover with the ten screws pre viously removed 9 7 Ordering Replacement Parts To order replaccment parts look up the ordering number from the compones parts listing and cal
20. he cables between the crossover and the power amplifier or from mis adjustment of the crossover Either of these situations could apply low frequency signals or hum to the driver and cause damage To prevent a potential mishap Allec Lansing recom mends using a capacitor between the amplifier and the compression driver to suppress Iow frequencies and possible DC Refer io the example in Figure 4 In choosing a value one must be careful not to interfere with the crossover frequency As a general rule select a capacitor whose break frequency with respect to the load is 3 dB down at approxi mately 4 of the high pass corner frequency Table III Compression Driver Protection Capacitors Crossover 810 l6n Frequency Driver Driver 900 Hz 800 tz 1000 Hz 1250 Hz 3150 Hz 80 uF 40 uF 25 uF 20 uF I6 uF 10 uF G pF Mylar capacitors with at ost a 100 volt ac rating are recom mended Table HI shows Lie re commended capacitor values for use with 8 and 16 ohm driver popular crossover frequencic 4 OCTAL ACCESSORY SOCKETS Two actal sockets permita variety of plug in aceessorics to be used with the amplifier Normally one D jumper is inserle be tween octal socket pins and 1 and another between pins T and 6 These jumpers must remot in place for the amplifier to operate when mot using any accessory modules To use with an accessory module remove and save the jumpers and install the mo
21. ically When the output devices cool to a safe operating temperature the channels wil automatically re sume normal operation 5 3 Protect Indicator The PROTECT LED illuminates when either channel enters thermal protection If a shutdown does occur the chan nels will resume normal operation as soon as ils devices have cooled to an aeceplable temperature Ifthe protection LED illuminates and there is no indication of ex cessive temperature one or both of the channels is in an internal fault mode If this occurs refer to the service instructions on page 12 6 OPERATION 6 1 Dual Mode of Operation In the dual mode of opera tion the channels may be operated independently After in stallation and hookup verify that the mode switch located on the rear panel is in the DUAL posi tion and rotate the level controls fully counterclockwise full atten uation Input a 0 dBu 0 775 V rms nominal signal level and apply power Slowly increase the level controls until the desired output power is obtained 1f either CLIP LED illuminates reduce the output with the channel level control or reduce the input signal level at its source WARNING N ever attempt to con nect the outputs of the two chan nels in parallel 6 2 Bridge Mode of Operation Afler installation and hookup verify that the mode switch located on the rear panel is in the BRIDGE position Rotate both levels controls fully coun
22. istor 10 KO 0 25 watt 5 metal film Resistor 22 kD 0 25 watt 5 metal film Resistor 120 KO 0 25 watt 5 metal film Resistor 300 Q 2 wait 5 metal oxide Resistor 68 0 2 watt 5 metal oxide Resistor 0 330 0 5 watt 5 cement Resistor 10 1 2 watt 5 metal oxide Resistor 80 KQ 0 25 watt 5 metal film Resistor 6 8 KO 0 25 watt 5 metal film Resistor 4 7 KA 0 25 watt 5 metal film Resistor 47 KA 0 25 watt 5 metal film Resistor 33 KQ 0 25 watt 5 metal film Resistor 56 KA 0 25 watt 5 metal film Resistor 220 KO 0 25 watt 5 metal film Resistor 20 KO 0 25 watt 5 metal film Resistor 18 K 0 25 watt 5 metal film Resistor 1 5 KO 0 25 watt 5 metal oxide Resistor 1 5 K 0 25 watt 5 metal film Resistor 100 KO 0 25 watt 5 metal film Resistor 4 7 KO 2 watt 5 metal oxide Resistor 330 2 0 25 watt 5 metal film Resistor 47 O 0 25 watt 5 metal film Resistor 330 Q 2 watt 5 metal oxide Capacitor 0 1 uF 100 volt 5 mylar Capacitor 100 pF 100 volt 5 ceramic Capacitor 0 1 pF 50 VDC electrolytic ALTEC LANSING CORPORATION 9 a Mark IV Com pany Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier Reference Designator C06 C106 C07 C17 C18 C107 C117 C118 C08 C09 C108 C109 C10 C18 C110 C113 C11 C111 C12 C112 C14 C15 C21 C114 C115 C121 C18 C116 C20 C922 C120 C122 C23 C24 C123
23. l former extend above and below the back panel 18581A 24 dB oct 0 625 inches 1 58 em Linkwitz RileyCrossover 15594A xxx 18 dB oct ALTEC LANSING CORPORATION continually Low Pass Filters strives to improve products and performance 15595A xxx 18 dB oct Therefore the specifications are subject to change High Pass Filters without notice 15599A Bass Boost module P n Ee ALTEC LANSING CORPORATION e a Mark IV Company 9 Operating and Service Instructions jor the Altec Lansing 9441A Power Amplifier i LANSING Lhe sound of experrence 9441A Power Amplifier SERVICE INSTRUCTIONS NO USER SERVICEABLE PARTS INSIDE EXTREMELY HAZ ARDOUS VOLTAGES AND CURRENTS MAY BE ENCOUNTERED WITHIN THE CHASSIS THE SERVICING INFORMATION CON TAINED WITHIN THIS DOCUMENT IS ONLY FOR USE BY ALTEC LANSING AUTHORIZED WARRANTY REPAIR STATIONS AND QUALIFIED SERVICE PERSONNEL TO AVOID ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO OTHERWISE REFER ALL SER VICING TO QUALIFIED SERVICE PERSONNEL 10 ALTEC LANSING CORPORATION e a Mark IV Company Operaiing and Service Instructions for the Altec Lansing 9441A Power Amplifier 9 SERVICE INFORM ATION WARNING No user serviceable parts inside Extremely hazardous voliages and currenis may be en countered within the chassis The servicing information contained within this document is only for use b
24. l 405 924 5311 FAX 405 324 8981 or writo Altec Lansing Replacement Parts Sales P O Bex 26105 Oklahoma City OK 73126 0105 9 8 Factory Service lf factory services 1s required ship the unit in its original packing prepaid L Altec Lansing Customer Service Repair 10500 W Reno Oklahoma City OK 73125 Enclose a note deseribing Lhe pro blem in as much detail as possible Include any additional help u in formation such as test conditions where used how used eic 9 9 Technical Assistance Forapplications assistance or other technical information contact the Technical Services Manager You can call 405 324 5311 FAX 405 324 8981 or write Altec Lansing Technical Services Manager P O Box 26105 Oklahoma City OK 73126 0105 ALTEC LANSING CORPORATION 9 a Mark IV Company 11 Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier LA a D mi s VW T l E LI E E Xr JOS S Gr x amp Eng CON coe mpfr z ATR Y Serie GETI PS cul E T c Aat 3 m 1 t IL E ros ra d A s 4155 rani I i DEZE PLE ATA m s o ao al P La Fk dl Y li 7 2 Pi 2 Figure 6 Schematic of 9441A Sheet 1 of 2 Toro SOOO e 12 ALTEC LANSING CORPORATION 9 a Mark IV Company Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier
25. nt 6 Install the 230 Vac 50 60Hz and the T2 0A 250V decals in the proper positions WHITE LO RECEPTACLE un pun 1 zm al L BL PL al lol lo lol lol lo a it d ki Act ELYWHT EE AA YE A 120 V so Primany Wiring Figure 2 Primary wiring Configuration for 120 V ac and 220 V nc M Printed in U S A 7 92 Revision 1 42 02 0384 2 Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier LANSING tHe sound of experience a Mark IV company P O Box 26105 Oklahoma City OK e 73126 0105 USA Tel 405 324 5311 9 FAX 405 324 8981 1992 by Altec Lansing Corporation All rights reserved worldwide Printed in U S A 04 92
26. or possi ble applications 3 3 Output Conneciions Output conneclions are made to the four terminal barrier strip connector located on the rear of the unit Refer to Figure 4 for typical output connections 3 4 Output Cable Selection Speaker wire size plays an importani part in quality sound systems Small wire gauges can waste power and damping faclor at the speaker terminals This can add coloration and muddiness to the sound To help offset this problem Table I has been assembled to enable you to calculate the power losses in the speaker cable 4 1 Calculating Power Losses with 8 ohm Loads To calculate the total power loss in the speaker cable multiply the power loss per foot or meter of the 2 wire cable sel ected from Table I by the length of the cable in feet or meters reduce the For example suppose an installer uses 160 feet of 10 GA 2 wire cable with an 8 A speaker system The total power loss in Lhe cable is Total Power Loss in cable 0 0191 watts foot x 180 feet 3 0 watts Does this mean that whenever the amplifier produces 75 walls of oulput power 72 0 watts 75 watts minus 3 0 watts will be delivered to the 8 ohm load NO The actual load impedance is ohms plus the resistance of ihe cable 0 00204 ohms foot times 150 feet for a total load impedance of 8 3264 ohms At the 8 Q rated output power the outpul voltage is 24 4 V rms Therefore tho amp lifier produces 71 5 wat
27. r than the ambien sir Ifthe air temperature excess 60 C 122 F the equipment should be spaced at least 1 75 inches apart or a blower installed to provide sufficient air movement within the cabinet WARNING Do not cprerale the amplifier within a completely closed unventilated hows ALTEC LANSING CORPORATION a Mark IV Company 1 Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier WHITE A C RECEPTACLE BLIWHT BAY Figure 2 Primary Wiring Configuration for 120 V ac and 220 240 V ac 3 SIGNAL CONNEC TIONS 3 1 Input Connections Balanced input connec tions may be made to either the A phone TRS or the female XLR connectors For single ended inputs strap the low input to ground pin 3 on XLR or Ring on Ms phone Otherwise the elect ronically balanced input stage will see 6 dB less input signal level than with a balanced input Refer to Figure 3 for typical input con noclions 3 2 Line Output Connec tions The XLR and Vi phone connectors are wired in parallel Pin 2 of the XLR is the Tip of the VA phone connector and pin 3 is the Ring Since the input imped ance of the electronically balanced inpul stage is high 15 kohins there is minimal loading on the signal source When the input connections are made to one con nector the other may be used as an auxiliary line output to feed other high input impedance equip ment Refer to Figure 3 f
28. slepperi up 0 01302 O T is shown in Figure 5 voltage of the system Pout 1s the rated output Table I 9441A Power Losses in 2 wire Speaker Cable power of the amplifier Zo is the output imped Power Cable Cross Power ance of the amplificr 10 08 AWG DCR N LOSSI Sectional DCR meler Losstreler ohms for the 9441A GA 2 11 watts f area mm iim watts m ZL is the load impedance b 0 00081 0 0075 13 30 0 00264 0 0247 DCR fE 1s ze DC 8 0 00121 0 0134 8 36 0 00421 0 0304 resistance of the wire 10 0 00204 0 0191 5 26 0 00660 0 0626 cable per foot from Table 12 0 00324 0 0303 3 31 0 01063 0 0052 I and 4 0 00515 0 0482 2 08 0 01691 0 1381 DF is the minimum 16 0 00819 0 0767 1 31 0 02685 0 2508 permissible damping fac 18 0 01302 20 0 02070 29 0 032202 0 1218 0 1935 0 3073 0 82 0 92 0 33 0 3996 0 6288 0 9860 0 04289 0 06764 0 10058 tor at the load 4 ALTEC LANSING CORPORATION e a Mark IV Company Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier Suppose a 210 volt system were used at a 200 watt power level to drive an 8 ohm load with a mini mum damping factor of 25 Using the same 18 GA cable as before the maximum length can now be 508 feet Power companies use this technique to transfer large amounts of power over great dis tances 3 6 Speaker Protection Fuse Selection Sometimes iL may be de sirable to use in line fuses fuses in series with the output to
29. terclockwise full attenua tion Input a 0 dBu 0 775 V rms nominal signal level into channel i only and apply power Slowly in crease the level control of channel l until the desired output power is obtained If either CLIP LED illuminates reduce the output level with the level control or re duce the input signal level at its source CAUTION Be sure that no inp t connections are made to channel 2 and that its level control is fully counterclockwise OFF WARNING The bridged output mode provides a true balanced to ground output Do not use any test equipment fo test or evaluate this amplifier which does not have floating grounds 7 In Case of Problems Please check the following items 1 Verify that the amplifier is properly connected to an ac power source and that the source is active 2 Verify that the input connections are properly made Refer to Figure 3 3 Verify that the output connections are properly made Refer to Figure 4 4 Check the input and out put cables for proper wiring and continu 5 Check the signal source and the load 6 Ensure that the two jumpers for each octal socket are properly in stalled if not using op tional plug in modules T Ensure that any a ccessory modules installed do not draw more than 5 ma DC of current 8 Check that the mode switch is in the desired position NOTICE Repairs performed by Other than authorized woyranty stations De
30. ts with this load instead of 75 watis This was calculated by squaring the voltage and dividing by lead impedance 24 4 divided by 8 3264 ohms Asa result Lip act ual power delivered to the load is 68 5 watts 71 5 walls minus 3 0 watts Had 18 GA wire been usec in the above example the Joss in the cable would have been 19 5 watts This example illustrates Lic im porlance of using the proper wire size 3 4 2 Calculating lower Losses with ohm Loads To calculate the losses when using a 4 ohm speaker sys tem multiply the loss at otims by 3 In the above example the 10 GA wire would consume 9 0 watts of power while the 18 GA wire would waste 58 5 watts more than half of the amplifier 5 ohm power rating 3 5 Damping Factor The higher the camping factor rating of an amplilier the greater the ability of the amp ifier 2 ALTEC LANSING CORPORATION a Mark IV Company Operating and Service Instructions for the Altec Lansing 9441A Power Amplifier SOURCE T HG SOURCE im LO d BALANCED HI f SOURCE W 600 OHM LA 40 2 TERMINATION XLR 7 HOT SE UNBALANCED SOURCE UNBALANCED HOT souRcE f XA 2 3 1 AMPLIFIER S DUTPUTS SPEAKER OUTPUTS C4 r a 7 DUAL MODE SPEAKER AKER OUTPUTS CHA Ii pie fF DUAL MODE qe SPEAKER OUTPUTS f AMPLIFIER S INPUTS 3 4341 OPTIONAL PROTECTION FUSE mE eem ET pou DR
31. y Altec Lansing authorized warranty repair stations and qualified service personnel To avoid electric shock DO NOT per form any servicing other than that contained in the Operating Instr uctions unless you are qualified to do so Otherwise refer all servi cing to qualified service personnel NOTICE Modifications fo Altee Lansing products are not recom mended Such modifications shall be at the sole expense of the person s or company responsible and any damage resulting there from shall mot be covered under warranty or otherwise 9 2 Equipment Needed To precisely adjust the trimpots you must have the fol lowing equipment o 1 Digital DC volt meter o 2 4 load rated at 200 watts o 1 Small non conducting flat blade screwdriver or set of plastic TV alignment tools o Miscellaneous handtools ta remove the top cover NOTE If you need to verify the amplifier s performance against the rated specifications you must be able to maintain the ac line voltage consiant at 120 V ae or 240 V ae if wired according to Figure 2 Therefore we recom mend a suitably rated variae 50 ampere raling at 120 V ac 9 2 Adjusting VRO2 and VR102 the BIAS Trimpot To adjust VRO2 and VR102 for the proper bias follow the pro cedures below 1 Turn power off and dis connect the unit from its power source Make sure the unit is in the Dual mode with 4 OQ loads con nected to each channel 2 Remove the ten scr
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