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Page 1: ...w SteamPoweredRadio Com AUDIMAX Models 4440A 4450A Automatic Level Control OPERATING AND MAINTENANCE INSTRUCTIONS THOMSON CSF LABORATORIES INC MAY 1 975 37 Brownhouse Road Stamford Conn 06902 203 327 7700 ...

Page 2: ...ET UP PROCEDURE 3 1 Level Adjustments 3 1 3 2 Variations from Standard Operating Procedw es 3 3 3 3 Gated Gain Stabilizer 3 3 3 4 Test Switch 3 5 3 5 Decay Recovery Time Switch 3 5 3 6 Modification of Monaw al Unit to Stereo Unit 3 6 SECTION IV THEORY OF OPERATION 4 1 General 4 1 4 2 Block Diagram Theory 4 1 4 3 Circuit Operation 4 4 4 4 Gated Gain Stabilizer GGS 4 5 4 5 Functional Graphs 4 7 4 6 ...

Page 3: ... 4450A Audimax Model 4440A or 4450A Outline Drawing Audimax Unit Front Panel Controls Audimax Block Diagram Audimax Circuit Boards and Their Locations Idss Bench Test Circuit for TlS58 Grn Stripe Replacement of A2Q4 Audimax Unit Internal Interconnections Input Output Board Al or A3 Schematic Diagram and Parts Locations Power Supply and Logic Board A2 Schematic Diagram and Parts Locations Page No 5...

Page 4: ...www SteamPoweredRadio Com INTRODUCTION 1 AUOIMAX 4440A A Model 4440A Monaural B Model 4450A Stereophonic Figure 1 1 Audimax Models 4440A and 4450A 1 0 ...

Page 5: ...vice The Model 4450A is a dual channel unit for stereophonic service Model 4450A units can be obtained either in factory assembled form or by field modifica dons of Model 4440A units A field modification kit for this conversion is available from Thomson CSF Laboratories Inc 1 2 FUNCTIONAL DESCRIPTION The Audimax automatic level control is wholly different in concept from ordinary compressors limit...

Page 6: ...ations but also are valuable in recording public address background music and two way communication systems 1 3 PHYSICAL DESCRIPTION The Audimax Models 4440A and 4450A are slim neat packages de signed for standard rack mounting Each has a front panel gain reduction meter and a few simple controls that seldom require resetting Three con trols on the left hand side of the front panel of either model...

Page 7: ... OUTPUT signal level adjustments and the CONTROL switch are repeated for the second channe1 The internal components of the Model 4440A consist of an ac power transformer an audio output transformer and two easily accessible transistor circuit boards One board contains the input amplification and output circuitry and much of the feedback and logic circuitry used for one audio channel The other boar...

Page 8: ... AND REPAIR If you should experience difficulty in installing operating or repair ing your Audimax unit please contact your distributor for assistance If necessary call Thomson CSF Laboratories Inc Stamford Connecticut Area Code 203 327 7700 1 6 SPECIFICATIONS AUDIMAX Model 4440A Monaural Control characteristic Frequency response Harmonic distortion Signal to noise ratio Gated gain stabilization 1...

Page 9: ...hms balanced or unbalanced 25 dBm 14 VU program 18 dBm sine wave 26 dBm 55 C Standard 19 rack mounting 1 3 4 high 15 deep except for cable and connectors 10 watts at 115 230 volts ac 50 60 Hz AUDIMAX Model 4450A Stereophonic Physical dimensions Power requirements Other char acteristics Same as Model 4440A 15 watts at 115 230 volts ac 50 60 Hz Each channel same as Model 4440A These specifications d...

Page 10: ...re 2 1 Install the unit in a reasonably well ventilated position making sure there is no high heat producing equipment beneath it The ambient temperature should not exceed 130 F For broadcast station applications it is recommended that the Audimax unit be installed in a studio and its output fed directly into the main audio line Satisfactory operation requires that the unit be presented with a con...

Page 11: ...eamPoweredRadio Com LINE coeD 6 5 FT LG INSTALLATION PRODUCT NAME PLAT 31 7__ TER MINA 80ARO 19 00 i o 0 0 0MITTEO ON MONO UN r Figure 2 1 Audimax Model 4440A or 4450A Outline Drawing 14 2 88 1 00 015 718 2 2 ...

Page 12: ...wer transformer permitting the selection of either 115 volt or 230 volt operation If 230 volt operation is required the following procedure must be performed NOTE For access to internal parts see Section V of this manual A Unsolder and remove the black white lead from terminal 4 of TB 1 figure 7 1 This is the terminal strip adjacent to the power transformer B Unsolder and remove the brown lead fro...

Page 13: ...rear of the chassis as indicated in Figure 2 1 Terminals 1 and 2 are the input terminals while terminals 4 and 5 are the output terminals Terminal 3 is the chassis ground In the stereophonic model the left channel terminals are as listed above while the right channel is connected as follows input 6 and 7 output 9 and 10 ground 8 2 4 ...

Page 14: ...PERATIONAL SET UP TEST SWITCH INPUT CONTROL OUTPUT LEVEL SWITCH LEVEL v LEFT CHANNEL OR MONAURAL CONTROLS GAIN METER INPUT CONTROL OUTPUT LEVEL SWITCH LEVEL RIGHT CHANNEL CONTROLS ON STEREO MODEL ONLY Figure 3 1 Audimax Unit Front Panel Controls ...

Page 15: ...t panel are provided for the right channel The INPUT level setting may be established by either of two methods 1 Set the POWER and CONTROL switches at ON and use a recording or other program source to adjust the INPUT level control as necessary to achieve the average 0 dB reading 2 An oscillator may be used in place of the usual program sources or may be connected directly to the Audimax input The...

Page 16: ... left CONTROL switch at ON and the right CONTROL switch at OFF and adjust the INPUT level for a O dB indication on the meter with normal program level input connected to the left channel As for the monaural unit if an oscillator is used as a signal source its output should be adjusted to a level 4 dB above the normal VU level of the line in which the Audimax unit is connected Proper impedance matc...

Page 17: ...C The third variation from usual procedures concerns fades Since the Audimax wiit will defeat any slow deliberate reduction of level all fade operations must be performed more rapidly than in the past A little practice will easily result in the required skill The most convenient way to insure proper procedures at all locations is to connect all cue lines to some point beyond the Audimax output 3 3...

Page 18: ...ce values of R63 and R64 on the input output board s Al and A3 Or the threshold may be lowered by r educing the values of these resistors The following table gives suggested values GGS Threshold 4 dB 8 dB 11 dB 14 dB 17 dB R63 R64 1 100 ohms 620 ohms 270 ohms 200 ohms 110 ohms Sine wave verification of the GGS threshold level may be obtained by the following procedure A Apply a sine wave input to ...

Page 19: ...on is to facilitate overall system per formance measurements 3 5 DECAY RECOVERY TIME SWITCH The gain control action of the Audimax unit has been designed to provide a precise degree of control with a minimum of noticeable change in the short term dynamic range As a tool for the broadcaster it provides maximum modulation consistent with artistically acceptable performance for a wide variety of prog...

Page 20: ...e r ecovery time is left to the discretion of the user the following table indicates general pref erences based on programming format Format Mixed Talk Top 40 Recovery Time Slow 10 megohms Medium 4 megohms Fast 3 megohms 3 6 MODIFICATION OF MONAURAL UNIT TO STEREO UNIT The expansion of the monaural Audimax Model 4440A to a stereo Audimax Model 4450A can be accomplished in the field with a Thomson ...

Page 21: ...are is provided 5 Mount the input output board A3 on the standoffs on the right side of the chassis 6 Using the jumpers provided connect the input output board A3 to the appropriate components in accordance with the stereo interconnecting schematic figure 7 1 7 Connect the right channel interface cables to your system in accordance with the stereo interconnecting schematic figure 7 1 8 The physica...

Page 22: ...TE ALL REFEREN CE OESIGNA TIONS ON THI S BOARO HAVE THE PREFIX A2 r INPUT OUTPUT CIRCUIT BOARD A3 GG S VOLTA GE FROM RECTIFIER I 7 FROM I RE CTIFIER I 2 I I _ _J LEFT CHANNEL OR MONAURAL CONTROL CONT ROLLED AUDIO SIGNAL STORA GE CI RCUI T COMPAR A TOR RECOVERY AND GATE RETURN T O Z ERO CIRCUIT OUTPUT TRANSFORMER POWER SU PPLY OR GATE FROM RECTI FIER 3 I I OUT PUT 6 DB PAD RS I THAU R55 20 voe 15 v...

Page 23: ...same feedback logic and power supply circuits as for the shared use of both the left and right channels in the stereo model 4 2 BLOCK DIAGRAM THEORY See figures 4 1 and 7 1 through 7 3 Since the right channel circuit board A3 and associated output transformer and controls in the stereo model are identical to board Al and associated trans former and controls in either model the following discussion...

Page 24: ... gain reduction when the signal level rises suddenly is approximately 10 milliseconds and is determined by the charging time of the rectifier 1 capacitor in the memory unit figure 7 3 The recovery time i e the time required to effect a gain increase when the signal level drops is a function of several variables Audimax utilizes the platform concept This means that instead of a recovery action wher...

Page 25: ... gentle action provided by the selected recovery resistor is especially useful in improving average modulation levels This action is independent of the normal Audimax gain riding functions and is completely unobjectionable with normal programming If it is deemed desirable to speed up or slow down this aspect of the recovery characteristics the resistance value of A2Rl3 may be decreased or that of ...

Page 26: ...d AlQ8 figure 7 2 are connected as emitter fol lowers to provide a low driving impedance for the output and logic circuits The output stage consists of a 600 ohm output transformer T2 driven by a class A push pull amplifier A1Ql4 and A1Ql5 which is in turn driven by the balanced emitter followers A1Ql2 and A1Ql3 The output level is ad justed with the front panel OUTPUT potentiometer R2 figures 7 1...

Page 27: ...e 7 3 This point is connected to the gate of the FET source follower A2Q4 which has negligible loading effect on the storage capacitor and also serves as a low impedance voltage source for the Vario losser s Rectifier 2 also generates a negative voltage from the program audio signal but because of the different bias and different time constants its output may be more or less negative than that of ...

Page 28: ...utput of rectifier 2 whenever the output of rectifier 2 is less negative than the output of rectifier 3 If the input signal were suddently removed without rectifier 3 in the circuit the con trol voltage would soon return to zero However since the no signal output of the board is 4 volts the output from rectifier 2 will rise only up to 4 volts upon signal_ lapse thereupon rectifier 2 will relinquis...

Page 29: ...ariolosser loss is approximately 15 dB Figure 4 2B shows the outputs of rectifiers 1 and 2 as a function of Audimax output levels The voltage across the storage capacitor developed by the biased rectifier 1 is shown by the curve OOH while the voltage de veloped by rectifier 2 which drives the comparator is shown by curve OJQ Figures 4 2C and D along with 4 2B can be used to illustrate the platform...

Page 30: ... GAI i 10 20 INPUT LEVEL dbm II I I I I I MIOSC1 LE N 0 50 4 5 40 35 30 20 I OUTPUT LfVEL ldbm 120 ti 5 10 t 5 0 I I I 1 s I V Vo A V D EFFECTS ON OUTPUT LEVELS 0 20 Cl E Q O D w a 15 0 u w II E ro 0 J w s w J Cl 0 0 5 10 INPUT LEVEL 50 dbm 1o pc r THEORY OF OPERATION GAIN METER READS o CENTER SC ALE7 I 10 POINT GAIN _ LINE OF COII STANT GAIN I I 1 Ac NS rANT GA N 10 E INPUT VS OUTPUT d bm Figure ...

Page 31: ...negative because charge is retained by the recovery AND circuit hence as the input drops from 15dBm to 20 dBm the gain remains constant along NP the output follows the line CD control voltage to Q27 remains constant along HK while the output of rectifier 2 drops along QK As the input level is reduced below 20 dBm however the output of rectifier 2 becomes less negative than the output of rectifier ...

Page 32: ... The regulated power supply in the Audimax unit provides 20 vdc and 15 vdc The schematic diagram of the regulated power supply is shown in figure 7 3 Line regulation is used to prevent variations in the ac line input from affecting Audimax circuit operation Line voltage is applied to the primary of the power transformer T2 through the front panel POWER switch S1 and fuse Fl figure 7 1 The primary ...

Page 33: ...f the TEST switch figure 7 1 the Audimax unit operates while the GAIN meter monitors the voltage at the source of A2Q4 figure 7 3 This voltage is proportional to Variolosser attenuation and the meter indicates the approximate relative gain in the system For the TEST position the switch connects the control line to the voltage divider consisting of A2R15 16 and A2CR4 6 figure 7 3 providing a consta...

Page 34: ...ifier 1 is composed of A3CR6 7 and A3CR5 8 Similarly rectifier 2 in the left channel is composed of AlCRl0 12 and AlCR9 11 and in the right channel is composed of A3CR10 12 and A3CR9 11 In creating the control voltage the outputs of all four diode pairs termed rectifier 1 are combined in a logical OR function and collectively used to charge the main storage capacitor in the memory unit as previous...

Page 35: ...h as those recorded in the Columbia s8system In the SQ system the rear channels are encoded as signals of equal amplitude in both left and right channels but at a relative phase of 90 left leading for a left back signal right leading for a right back signal However if receivers are to decode this information correctly it is imperative that this relative amplitude and phase relationship be maintain...

Page 36: ...www SteamPoweredRadio Com INPUT OUTPUT BOARD A I MAINTENANCE IN STEREO MODEL ONLY Figure 5 1 Audimax Circuit Boards and Their Locations 5 0 POWER SUPPLY ANO LOGIC BOARD A2 INPUT OUTPUT BOARD A3 ...

Page 37: ...ullest appropriate extent the same instruc tions should also be followed for the monaural model Steps requiring both inputs or both outputs to be connected in parallel etc are to be omitted for the monaural model but all steps and measurement values pertinent to the left audio channel a logic circuit or power supply are equally applicable to the monaural model 5 2 QUICK OVERALL CHECK A Connect bot...

Page 38: ... ground test point on the circuit board under test Circuit Test Point Voltage Left control voltage AlTPl 1 1 de Left output A A1TP3 0 30 ac Left output B AlTP2 0 30 ac Left drive A A1TP5 0 35 ac Left drive B A1TP4 0 35 ac Power Supply 20 volts A2TP2 19 4 de 15 volts A2TP1 14 4 de Panel meter Should read at mid scale Left GGS output A1TP9 12 5 de Platform AlTPl0 6 5 de Control A2TP5 or 1 3 de Note ...

Page 39: ...MENT PROCEDURE A Turn the INPUT and OUTPUT controls fully cw Set AlRl7 A1R44 A2R24 and A2R30 in center positions A1R15 in midposition A2R27 fully cw TEST switch at TEST and CONTROL switch at ON Set A2S1 at M medium B With no input adjust A2R24 for a zero O reading on the GAIN meter C Connect a jumper between the control test point A2TP5 and ground Then apply a 1 kHz signal at a level of 12mv to th...

Page 40: ...ld increase less than 1 5 dB with respect to the final level in F I Measure the harmonic distortion of the left channel output at 1 kHz input signal frequency Minimize the distortion by adjusting AlRl7 It should be less than O 5 percent J Remove the input After the meter reading has come to rest in the green region adjust A1R15 for minimum output noise The wideband noise measured should be less th...

Page 41: ... the two outputs Then sep arate the two channels 5 4 TROUBLESHOOTING SUGGESTIONS A Power Supply Board Board A2 Troubleshooting of any apparent malfunction of the Audimax unit should begin with a check of the power supply The de voltages indicated at the power supply test points on board A2 should be within 10 percent of the nominal values indicated on the schematic diagram figure 7 3 Accidental sh...

Page 42: ...the proper drive voltages to be expected at the appropriate test points If the outputs of the board Al or A3 are correct but not the corresponding drive voltages suspect the Al or A3 stage containing QlO and Qll If the drive voltages are present but no output examine the transistors in the Al or A3 output amplifier Q12 through Q15 If any of these transistors is replaced it will be necessary to r e...

Page 43: ...cuits CAUTION Be careful when making the fol lowing tests The memory unit can be permanently damaged if the voltmeter probe shorts these points to other voltages 1 Testing the Logic Circuits The solid state memory unit on board A2 has been encapsulated in epoxy for maximum stability and protec tion No attempt should be made to open it since all test measurements can be made at appropriate external...

Page 44: ...ge direction and move progressively back toward larger negative values at approximately 45 dBm The turning point occurs when the output of rectifier 3 becomes more negative than the output of rectifier 2 The steady state voltage relationships are graphically shown in figure 4 2 2 If Necessary to Replace A2Q4 several calibration adjustments will have to be made when the replacement transistor is in...

Page 45: ...has a socket and there is no A2R35 follow this procedure If A2Q4 has no socket and there is a potentiometer A2R35 foqow the pro cedure in subparagraph Before inserting the replacement transistor measure its source to drain current Idss in a bench test circuit as shown in figure 5 2 Inspect the following list of Id limits to ieter ss mine whether a bleeder resistor dash lined in the configuration A...

Page 46: ...teamPoweredRadio Com MAINTENANCE SHORTING JUMPER G t D 201 20V BENCH POWER SUPPLY TIS58 GREEN STRIPE FET BY TEXAS INSTRUMENTS Figure 5 2 Id Bench Test Circuit for T1S58 Grn Stripe ss Replacement of A2Q4 5 10 ...

Page 47: ...of the bleeder to the FET source pin of the A2Q4 socket using the run to the end of the poten tiometer A2R29 Connect the other end of the bleeder to the 15v terminals of the board E19 1 and E19 2 using the available 15v run that has a blank hold 4 Remove the replacement FET from the bench test circuit and plug it into the Q4 socket The flat of the FET must face the adjacent memory unit metal can 5...

Page 48: ...ibration potentiometer A2R35 If A2Q4 has no socket and there is a potentiometer A2R35 follow this procedure If there is a socket for A2Q4 and no potentiometer A2R35 fol low the procedure in subparagraph Install the replacement transistor Then place the front panel TEST switch in upper position and remove signal inputs if any Connect a jumper from A2TP5 control to A2TP4 ground Connect a second jump...

Page 49: ... as needed for a deflec tion as far to the right as possible without going off scale 7 If a vtvm is available use it to measure the de voltage at A2TP5 gate of A2Q4 A potential from Ov to lv de should be here This verifies proper setting of A2R35 If the voltage is satisfactory leave A2R35 at its present setting otherwise repeat the preceding steps 8 Remove the jumper from A2TP6 and A2TP7 9 Recalib...

Page 50: ... that speed at which a drift toward platforms of higher gain occurs This latter time constant is controlled by A2R9 A2R11 and A2R13 After the gain has stabilized at maximum short out the input signal and watch the GAIN meter Gain should remain constant for at least 8 seconds and then slowly return to the normal region Next increase the input signal level 20 dB for a GAIN meter reading of approxima...

Page 51: ...NANCE This check is valid only for 100 ohm resistors AlR63 A1R64 and A3R63 A3R64 as factory supplied If the values of these resistors have been changed to alter the GGS threshold the performance check must be accord ingly changed 5 15 ...

Page 52: ...lacements If the part cannot be readily obtained contact Thomson CSF Laboratories to pro cure it 6 2 RESISTORS Except where otherwise indicated in the parts lists all resistors used in the Audimax W1it are carbon composition 1 4 watt plus or minus 5 6 3 TRANSISTORS AND DIODES When replacing transistors and diodes called out in the parts lists with l N and 2N standard numbers replace them with the ...

Page 53: ... AUG Augat BECK Beckman BEL Belden COE Cornell Dubilier CIN Cinch Manufacturing CK C K Components COM Components Incorporated FAIR Fairchild Semiconductor HHS Herman H Smith IERC IERC Inc LF Littlefuse MA Mallory MO Motorola l ffi Milton Ross SLOA Sloan SPR Sprague T CSF Thomson CSF Laboratories Inc THRM Thermalloy TI Texas Instruments VAR Varo 6 2 ...

Page 54: ...nience all differences between the latest and earlier serial number units are summarized below in the Configuration A and Configuration B columns Ref Ref Location Para Desig Configuration A Configuration Btl Power supply and 6 7 R26 logic board A2 Front panel assembly 6 8 Earlier serial numbers Latest serial numbers R27 R32 R33 R34 R35 Bleeder resistor no reference designation Q4 DSl 3 9 kilohms V...

Page 55: ...I T CSF 961627 output circuit board assy See paragraph 6 6 A2 Power supply and logic T CSF 961628 2 II circuit board assy or 3 See paragraph 6 7 A3 Input GGS logic I out T CSF 961627 put circuit board assy Same as Al See paragraph 6 6 Fl Fuse 3 10 amp LF 3AG SLO 991256 BLO Tl Transformer T CSF 962132 T2 Transformer T CSF 962133 T3 Transformer T CSF 962132 TBl Terminal strip HHS 850 991188 Configur...

Page 56: ...53 18 991518 X X 10 001 XFl Fuseholder LF 342012 990595 X X Three wire power BEL 17237 991443 X X cord assy 6 6 INPUT OUTPUT BOARD Al or A3 Ref Description Mfr Part No T CSF No RESISTORS Rl 620 ohms R2 R3 2 4 kilohms R4 Not used R5 10 ohms R6 R7 24 kilohms RS R9 R18 10 kilohms R25 R26 R29 R30 R34 R35 R56 R60 R61 R67 R72 Board A3 is included only in the stereo Model 4450A 6 5 ...

Page 57: ...ot to 10 kilohms R16 R19 4 7 kilohms R20 1 kilohm R21 R22 R37 75 ohms R38 R23 R24 R59 5 1 kilohms R27 R28 R32 100 kilohms R33 R57 R58 R69 R74 R75 R31 Not used R36 1 2 kilohms R39 R40 3 kilohms R41 R42 R88 5 6 kilohms R43 R45 R62 9 1 kilohms R44 Variable linear BECK 62PR2K 991314 Helipot to 2 kilohms R46 R47 R71 30 kilohms R48 15 ohms R49 R50 33 ohms R51 R52 R54 100 ohms R55 Board A3 is included on...

Page 58: ...0 510 ohms R73 51 kilohms R76 R77 47 kilohms R78 R79 910 kilohms R80 R81 27 kilohms R83 R84 240 ohms R86 8 2 kilohms CAPACITORS Values in microfarads except where otherwise indicated Cl C2 C5 4 7 35v 20 MA TAC475M035P04 991317 thru C14 Cl7 C18 C3 C4 C15 8 2 35v 20 MA TAC825K035P04 991318 C16 C19 thru O 47 100 wvdc 20 AMRA 2MBPC1474M 991252 C22 C23 Not used Board A3 is included only in the stereo M...

Page 59: ...u CR12 Diode FAIR 1N456A Ql Q4 Q7 thru Transistor 2N3393 Ql3 Q16 Q19 Q20 Q21 Q2 Q3 Q5 Q6 Transistor MO MPS 6521 Q14 Q15 Transistor D40D4 Q17 Q18 Transistor 2N3390 MISCELLANEOUS Transipad MR 10171 Heatsink IERC PAl lCB Etch drill and mark assy Board A3 is included only in the stereo Model 4450A Matched pair Vf matched to within 10v when If 1 0 ma Must have opaque body T CSF No 991203 991158 961806 ...

Page 60: ...rewound R3 3 9 ohms 1 2 w R4 1 kilohm 1 2 w R5 470 ohms 1 2 w R6 82 ohms 1 2 w R7 68 ohms 1 2 w RB 33 kilohms R9 5 1 megohms R10 R17 100 kilohms Rll R23 10 megohms R12 750 ohms R13 3 megohms R14 R18 1 megohm R15 680 ohms Rl6 51 kilohms R19 10 kilohms R20 6 2 kilohms R21 2 kilohms R22 300 kilohms R24 Variable linear BECK 62PR1K 991161 Helipot to 1 kilohm R25 2 2 kilohms 6 9 ...

Page 61: ...pot to 200 ohms R27 Variable linear BECK 62PR500 991162 Configuration B Helipot to 500 ohms R28 1 2 kilohms R29 820 ohms R30 Variable linear BECK 62PR5K 991311 Helipot to 5 kilohms R31 Not used R32 3 9 kilohms Configuration A R32 2 kilohms AB Type CB Configuration B R33 1 2 k ilohms lw AB Configuration 1 A R33 1 kilohm 3w SPR 242El025 991716 Configuration B R34 Not used Configuration A R34 3 6 kil...

Page 62: ...test CAPACITORS Values in microfarads except where otherwise indicated Part No 62PR50K Cl thru C6 250 50v electrolytic MA TCW250N050P1J C7 33 4vnp COM NS336A SEMICONDUCTORS CRl Diode rectifier VAR VE18 CR2 CR3 CR5 Diode FAIR 1N456A thru CR13 CR4 Not used Ql Transistor GE D41Dl Q2 Transistor 2N3766 Q3 Transistor PNP MO 2N3906 Q4 Transistor FET TI TIS58 Grn Configuration A Stripe Q4 Transistor FET T...

Page 63: ... Memory unit assy 961594 1 Transipad MR 10171 990747 Heatsink IER PAl lCB 991316 Heatsink TlffiM 6166 991312 Etch drill and 961622 1 mark assy 6 8 FRONT PANEL ASSEMBLY Used on X Model Model Ref Description Mfr Part No CBS No 4440A 4450A DSl Indicator LED SLOA P175RRRJPD X X red Con figuration A DSl Indicator LED FAIR FLV110 921729 X X red Con figuration B Ml Meter 962167 X X Rl R2 Resistor variabl...

Page 64: ...art No T CSF No 4440A 4450A Sl S3 Switch SPDT ALCO MST 105D 991176 X X S2 Switch DPDT ALCO MST 205N 990851 X X S4 Switch DPDT ALCO MST 205N 990851 X XDSl Not used Con figuration A XDSl Socket Con AUG 8060 1G34 991708 X X figuration B Adapter panel FAIR FLS 012 991730 X X mount for DSl Configuration B only 6 13 ...

Page 65: ...www SteamPoweredRadio Com SECTION VII DRAWINGS 7 1 ...

Page 66: ... 1 E 14 u E 1 6 o 7 I I I I I I I I I I I I I I I J E1 2 0 E16 G ND E 1 5 t I I I I I I I I E 1 O 0 E 17 1 t 20V 0 E 19 1 15 v A3 0 E22 1 v E 2 1 1 O E2O 1 OE5 1 o 1 IJ r 0 UJ w w UJ t oE2 w w w w 1 J _ 7 O F 2 I L I f O N I v v 3 I IOFF _ R 4 SK I __ OUTPUT _ 2 4 0 N _ _ J CONTROL R IE H T CHANl lE L DRAWINGS NOTES 1 RIGHT CHANNEL TO BE USED WITH STEREO ONLY 2 AUDIMAX MONAURAL MODEL 4440A 3 AUDIM...

Page 67: ... 7 A 6 f 1 C R 2 Q G c ___ l Cr t t A ci _ ___ _ j_______ _G _ l 1 8 2i v 4 7K Q8 TP3 e OUT A TP2 ourA i OK 35 OK 3G 38 e 75 TP4 e DR IV 1 42 C 0 VV j f __ _______ _ 1 l 5 c c 4 7 f 35v 40 3 K R47 30 K DRAWINGS CS3 820 ess J v 1 OUTPUT JOO 00 El c 6 C 3 PAD 000 n 20vr 7 1 GND EIB lg 1 1 L 7H T r t _j___J __ t i L 1 l j 1 E 8 2 r EC l5 V E 9 2 G ND RSo vv Cl 4 7 35r 4 IOI t 0 r v 65 CIZ 2 0 K 4 7 G...

Page 68: ... 5 B ALL CAPACITORS ARE IN MICROFARADS 2 JINDICATES A HEATSINK 3 Q4 CIRCUIT CONFIGURATION B SHOWN IN MAIN DIAGRAM SEE SUPPLEMENTARY DIAGRAM ON APRON OF THIS ILLUSTRATION FOR Q4 CIRCUIT CONFIGURATION A EARLIER SERIAL NUMBER AUDIMAX UNITS 4 CONFIGURATION B VALUE OF R33 SHOWN IN CONFIGURATION A EARLIER SERIAL NUMBER AUDIMAX UNITS VALUE OF R33 IS 1 2K 1 W e TPZ 2ov 20V I I c 250 I sov P3 GHD I GND I c...

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