Crown Com-Tech CT-400 Manuale di Servizio

Com-Tech 400 Amplifier Service Manual1COM-TECH® 400POWER AMPLIFIERSERVICE MANUALK-SVCCT40012-95Com-Tech®, ODEP® and Crown® are registered trademarks

Com-Tech 400 Amplifier Service Manual10inverted feedback from the HS output to control theground reference for the rails (±Vcc). Both LS quad-rants ar

Com-Tech 400 Amplifier Service Manual11TheoryNEGATIVELOW SIDEOUTPUTPNP STAGEPOSITIVELOW SIDEOUTPUTNPN STAGENEGATIVEHIGH SIDEOUTPUTPNP STAGEPOSITIVEHIG

Com-Tech 400 Amplifier Service Manual12Electrical Checkout ProceduresGeneral InformationThe following test procedures are to be used to verifyoperatio

Com-Tech 400 Amplifier Service Manual13Test 4: AC Power DrawSpec: 60 Watts maximum quiescent.Initial Conditions: Controls per standard.Procedure: With

Com-Tech 400 Amplifier Service Manual14Electrical Checkout ProceduresTest 12: Output PowerSpec at 8 Ohm Stereo: ≥ 215 Watts/Ch at 0.1% THDSpec at 4 Oh

Com-Tech 400 Amplifier Service Manual15Electrical Checkout ProceduresTest 18: Intermodulation DistortionSpec at 0 dB output: ≤ 0.01%.Spec at -35 dB ou

Com-Tech 400 Amplifier Service Manual16Supplimental ItemsCPN Item QuantityA10087-71012 Rack Screw, 10-32 x .75 8C 3342-0 Feet, Selfstick Black 4D 4137

Com-Tech 400 Amplifier Service Manual17Parts List (Non-Module)Back Panel AssemblyCPN Item QuantityD 8367-1 Knob, .5 Dia. Level Control 2A10086-10410 S

Com-Tech 400 Amplifier Service Manual18Parts List (Non-Module)Main Chassis Assembly Cont.CPN Item QuantityC 6457-3 Screw, #8 x 3/8 2C 6912-7 Tension R

Com-Tech 400 Amplifier Service Manual19Module and Schematic InformationModule HistoryThe Com Tech 400B amplifier was introduced in 1990.Since then the

Com-Tech 400 Amplifier Service Manual2À PRÉVENIR LE CHOCÉLECTRIQUE N’ENLEVEZPAS LES COUVERTURES.RIEN DES PARTIESUTILES À L’INTÉRIEUR.DÉBRANCHER LA BOR

Com-Tech 400 Amplifier Service Manual20Q42762-7 Control Module (P10317-9 board) Parts ListsCapacitorsC700 C800 C 8426-6 .1µF 250VC701 C801 C 8426-6 .1

Com-Tech 400 Amplifier Service Manual21Q43214-8 Control Module (P10404-5 board) Parts ListCapacitorsC700 C800 C 8426-6 .1µF 200VC701 C801 C 8426-6 .1µ

Com-Tech 400 Amplifier Service Manual22Q43242-9 Control Module (P10405-2 board) Parts ListCapacitorsC700 C800 C 8426-6 .1µF 250VC701 C801 C 8426-6 .1µ

Com-Tech 400 Amplifier Service Manual23Q42706-4 Display Module (D 7083-5 board) Parts ListCapacitorsC500 C600 C 6802-0 .47µF 50VC901 C 6804-6 .1µF 50V

Com-Tech 400 Amplifier Service Manual24CapacitorsC01 C 3978-1 .047µFC02 C 2938-6 .1µFC03 C 2938-6 .1µFC04 C 6806-1 .01µFC05 C 6806-1 .01µFC06 C 6806-1

Com-Tech 400 Amplifier Service Manual25Q42888-0 Output Module (P10315-3 board) Parts ListCapacitorsC01 C 8511-5 .047µF 250V AxC02 C 8426-6 .1µFC03 C 8

Com-Tech 400 Amplifier Service Manual26Q42969-8 Output Module (P10337-7 board) Parts ListCapacitorsC01 C 8511-5 .047µF 250V AxC02 C 8426-6 .1µFC03 C 8

Com-Tech 400 Amplifier Service Manual27Q43188-4 Output Module (P10396-3 board) Parts List Cont.CapacitorsC01 C 8511-5 .047µF 250V AxC02 C 8426-6 .1µFC

Com-Tech 400 Amplifier Service Manual28Q43012-6 Main Module (D 7911-7 board) Parts ListCapacitorsC1 C 4303-1 1000µFC2 C 3913-8 470µFC4 C 6802-0 .47µFC

Com-Tech 400 Amplifier Service Manual29Q43012-6 Main Module (D 7911-7 board) Parts ListQ120 Q220 C 3625-8 NPN 2N4125Q121 Q221 C 7458-0 NPN 2N4123Q122

Com-Tech 400 Amplifier Service Manual3Table of ContentsIntroduction ... 4Parts Information ..

Com-Tech 400 Amplifier Service Manual30Q43012-6 Main Module (D 7911-7 board) Parts ListR186 R286 A10266-2751 2.7MR187 R287 A10266-3631 36KR188 R288 A1

Com-Tech 400 Amplifier Service Manual31Q43043-1 Main Module (D 7993-5 board) Parts ListCapacitorsC1 C 4303-1 1000µFC2 C 3913-8 470µFC4 C 6802-0 .47µFC

Com-Tech 400 Amplifier Service Manual32Q43043-1 Main Module (D 7993-5 board) Parts ListQ120 Q220 C 3625-8 NPN 2N4125Q121 Q221 C 7458-0 NPN 2N4123Q122

Com-Tech 400 Amplifier Service Manual33Q43043-1 Main Module (D 7993-5 board) Parts ListR187 R287 A10266-3631 36KR188 R288 A10266-3631 36KR189 R289 A10

Com-Tech 400 Amplifier Service Manual34Q43129-8 Main Module (D8283-0 board) Parts ListCapacitorsC1 C 4303-1 1000µFC2 C 3913-8 470µFC4 C 6802-0 .47µFC5

Com-Tech 400 Amplifier Service Manual35Q43129-8 Main Module (D8283-0 board) Parts ListQ113 Q213 C 3625-8 NPN 2N4125Q115 Q215 D 2962-5 NPN MPS8097Q116

Com-Tech 400 Amplifier Service Manual36Q43129-8 Main Module (D8283-0 board) Parts ListR181 R281 A10266-4721 4.7KR182 R282 A10266-2201 22R183 R283 A102

Com-Tech 400 Amplifier Service Manual37Q43238-7 Main Module (D 8369-7 board) Parts ListCapacitorsC1 C 9859-7 1000µFC2 C 9859-7 1000µFC4 C 6802-0 .47µF

Com-Tech 400 Amplifier Service Manual38Q43238-7 Main Module (D 8369-7 board) Parts ListQ113 Q213 C 3625-8 NPN 2N4125Q115 Q215 D 2962-5 NPN MPS8097Q116

Com-Tech 400 Amplifier Service Manual39Q43238-7 Main Module (D 8369-7 board) Parts ListR180 R280 A10266-4711 470R181 R281 A10266-4721 4.7KR182 R282 A1

Com-Tech 400 Amplifier Service Manual4CrownTechnical Support GroupFactory ServiceParts DepartmentMailing Address:PO Box 1000Elkhart, IN USA 46515-10

Com-Tech 400 Amplifier Service Manual5Parts Informationshipment on a C.O.D. or pre-payment (check or creditcard) basis.TermsNormal terms are pre-paid.

Com-Tech 400 Amplifier Service Manual6SpecificationsUnless noted otherwise, all specifications are basedon driving an 8 ohm load per channel, both cha

Com-Tech 400 Amplifier Service Manual7TheoryOverviewIt should be noted that over time Crown makes im-provements and changes to their products for vari

Com-Tech 400 Amplifier Service Manual8TheoryError Amp, called the Error Signal (ES) drives theVoltage Translators.Voltage AmplificationThe Voltage Tra

Com-Tech 400 Amplifier Service Manual9As the input drive voltage becomes more positive, theHS NPN conducts and delivers positive voltage to theload. E