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Crown Audio 1200 manual

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  • Page 1

    Micro-T ech 1200 Amplifier Service Manual 1 MICRO-TECH ® -1200 PO WER AMPLIFIER SER VICE MANU AL K-SVCMT12 8-95 Micro-Tech ® , ODEP ® and Crown ® are registered trademarks of Crown International, Inc. Mailing Address: P.O. Box 1000 Elkhart, IN U.S.A. 46515-1000 Shipping Address: 57620 C.R. 105 Elkhart, IN U.S.A. 46517 ©1995 by CROWN INTERNATIO[...]

  • Page 2

    Micro-T ech 1200 Amplifier Service Manual 2 À PRÉVENIR LE CHOC ÉLECTRIQUE N’ENLEVEZ PAS LES COUVERTURES. RIEN DES PARTIES UTILES À L’INTÉRIEUR. DÉBRANCHER LA BORNE AVANT D’OUVRIR LA MODULE EN ARRIÈRE. TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PER[...]

  • Page 3

    Micro-T ech 1200 Amplifier Service Manual 3 Introduction ............................................................. 4 Scope ...................................................................... 4 Warranty .................................................................. 4 Parts Information ..................................................... [...]

  • Page 4

    Micro-T ech 1200 Amplifier Service Manual 4 Crown Technical Support Group Factory Service Parts Department Mailing Address: PO Box 1000 Elkhart, IN USA 46515-1000 Shipping Address: 57620 C.R. 105 Elkhart, IN USA 46517 Phone: (219) 294-8200 Toll Free: (800) 342-6939 FAX: (219) 294-8301 This manual contains service information on Crown power amplifie[...]

  • Page 5

    Micro-T ech 1200 Amplifier Service Manual 5 Parts Information shipment on a C.O.D. or pre-payment (check or credit card) basis. TERMS Normal terms are pre-paid. Net-30 Days applies to only those firms having pre-established accounts with Crown. If pre-paying, the order must be packed and weighed before a total bill can be established, after which a[...]

  • Page 6

    Micro-T ech 1200 Amplifier Service Manual 6 Specifications Unless noted otherwise, all specifications are based on driving an 8 ohm load per channel, both channels driven, the sensitivity switch in the 26dB position, the AC supply is 120V AC at 60Hz. Crown specifications are guaranteed thr ough the warranty period (nor mally 3 years). Because our t[...]

  • Page 7

    Micro-T ech 1200 Amplifier Service Manual 7 V oltage Conversion The 120 V olt 60 Hz version, sold in the United States, is not voltage selectable. It does not have voltage selection boards. This version is to be used only with 120 V olts and only with 60Hz. All other versions of the Micro T ech 1200 use voltage selection boards. The following chart[...]

  • Page 8

    Micro-T ech 1200 Amplifier Service Manual 8 Theor y OVERVIEW It should be noted that over time Crown makes im- provements and changes to their products for various reasons. This manual is up to date as of the time of writing. For additional information regarding these amplifiers, refer to the applicable Technical Notes provided by Crown for this pr[...]

  • Page 9

    Micro-T ech 1200 Amplifier Service Manual 9 Theor y amplifies the difference between input and output signals, any difference in the two waveforms will produce a near open loop gain condition which in turn results in high peak output voltage. The output of the Error Amp, called the Error Signal (ES) drives the Voltage Translators. VOLTAGE AMPLIFICA[...]

  • Page 10

    Micro-T ech 1200 Amplifier Service Manual 10 High Side (HS) The High Side (HS) of the bridge operates much like a conventional bipolar push-pull output configuration. As the input drive voltage becomes more positive, the HS NPN conducts and delivers positive voltage to the load. Eventually the NPN devices reach full conduc- tion and +Vcc is across [...]

  • Page 11

    Micro-T ech 1200 Amplifier Service Manual 11 respect to each other. This allows the power supply to deliver +Vcc and -Vcc from the same bridge rectifier and filter as a total difference in potential, regardless of their voltages with respect to ground. The LS uses inverted feedback from the HS output to control the ground reference for the rails (?[...]

  • Page 12

    Micro-T ech 1200 Amplifier Service Manual 12 Theor y NEGATIVE LOW SIDE OUTPUT PNP STAGE POSITIVE LOW SIDE OUTPUT NPN STAGE NEGATIVE HIGH SIDE OUTPUT PNP STAGE POSITIVE HIGH SIDE OUTPUT NPN STAGE HIGH SIDE BIAS SERVO +LVA -1 -LVA -1 +VOLTAGE TRANSLATOR -VOLTAGE TRANSLATOR OUTPUT DEVICE EMULATION PROTECTION ERROR AMP VGS BGS BALANCED INPUTS INVERTING[...]

  • Page 13

    Micro-T ech 1200 Amplifier Service Manual 13 Electrical Checkout Procedures GENERAL INFORMATION The following test procedures are to be used to verify operation of this amplifier. DO NOT connect a load or inject a signal unless directed to do so by the proce- dure. These tests, though meant for verification and alignment of the amplifier, may also [...]

  • Page 14

    Micro-T ech 1200 Amplifier Service Manual 14 TEST 4: AC POWER DRAW Spec: 100 Watts maximum quiescent. Initial Conditions: Controls per standard. Procedure: With no input signal and no load, measure AC line wattage draw. If current draw is excessive, check for high AC line voltage or high bias voltage. TEST 5: COMMON MODE REJECTION Spec at 100 Hz: ?[...]

  • Page 15

    Micro-T ech 1200 Amplifier Service Manual 15 Electrical Checkout Procedures Spec at 4 Ohm Stereo: >= 470W at 0.1% THD. Spec at 2 Ohm Stereo: >= 600W at 0.1% THD. International 8 Ohm Stereo: >=305W at 0.1% THD. International 4 Ohm Stereo: >=430W at 0.1% THD. International 2 Ohm Stereo: >=535W at 0.1% THD. Initial Conditions: Controls [...]

  • Page 16

    Micro-T ech 1200 Amplifier Service Manual 16 Spec: No dangerous transients. Initial Conditions: Controls per standard. Procedure: From an on condition, turn off the amplifier and monitor the output noise at the time of turn off. Note: Turn off noise may increase significantly if the amplifier is cycled off and on. TEST 19: INTERMODULATION DISTORTIO[...]

  • Page 17

    Micro-T ech 1200 Amplifier Service Manual 17 Parts List (Non-Module) SUPPLIMENTAL ITEMS CP N ITEM QTY D 4137-2 Nylon Thumbscrew W asher 4 C 3342-0 Feet, Black Self-Stick 4 A10087-71012 10-32 .75 Machine (Rack Screw) 4 K80583-6 MT Series Owners Manual 1 POWER SUPPLY CP N ITEM QTY M43534-3 MT Fuse Board Assembly (120V , 60Hz Units Only) 1 D 8069-4 Fu[...]

  • Page 18

    Micro-T ech 1200 Amplifier Service Manual 18 Parts List (Non-Module) OUTPUT ASSEMBL Y (CONT .) CPN ITEM QTY (ONE PER CHANNEL) D 8774-8 PTC, 95 Deg. Ther mal Sensor 1 F12019-0 Aluminum Heatsink Slug (under diodes on output mod) 1 C 8813-5 MPS8097/MPSA18 NPN T ransistor (Q318/Q418) 1 B 5842-8 #23 T ubing for Q318/Q418 transistor leads Or der in inche[...]

  • Page 19

    Micro-T ech 1200 Amplifier Service Manual 19 Parts List (Non-Module) MAIN CHASSIS ASSEMBL Y (CONT .) CPN ITEM QTY . A10110-70605 Screw , 6-32-.312 T aptite Ph (Covers) 20 A10086-70806 8-32 x .37 Screw 3 A10094-3 #6 Internal Star Washer 3 A10094-6 #8 Internal Star Washer 4 A10094-8 #10 Internal Star Washer , Zinc 12 A10099-7 #10 Nylonb Shoulder W as[...]

  • Page 20

    Micro-T ech 1200 Amplifier Service Manual 20 Module and Schematic Information MODULE HISTORY The Micro Tech 1200 amplifier was introduced in January 1986. Since then there have been several updates and revisions, some of which called for new modules. The following is a list of all modules used up to this date, August 1995. OUTPUT MODULES: (left and[...]

  • Page 21

    Micro-T ech 1200 Amplifier Service Manual 21 Fuse and Display Module Parts Lists Q43061-3 ODEP DISPLA Y MODULE CAP ACITORS C503 C603 C 6806-1 .01µF 100V C507 C607 C 6809-5 220pF 100V C701 C 6802-0 .47µF 50V C702 C 6802-0 .47µF 50V DIODES D701 C 3533-4 1N966B 16V Zener D702 C 3533-4 1N966B 16V Zener LED'S E502 E602 C 4342-9 Amber #MV5153 E70[...]

  • Page 22

    Micro-T ech 1200 Amplifier Service Manual 22 CAP ACITORS C01 C 3978-1 .047µF C02 C 6804-6 .1µF C03 C 6804-6 .1µF C04 C 3996-3 .0047µF C05 C 6807-9 .001µF C06 C 6806-1 .01µF C07 C 6807-9 .001µF C08 C 6809-5 220pF C09 C 6810-3 180pF DIODES D01 C 2851-1 1N4004 D02 C 2851-1 1N4004 D03 C 2851-1 1N4004 D04 C 2851-1 1N4004 D05 C 2851-1 1N4004 D06 C[...]

  • Page 23

    Micro-T ech 1200 Amplifier Service Manual 23 CAP ACITORS C01 C 3978-1 .047µF C02 C 6804-6 .1µF C03 C 6804-6 .1µF C04 C 3996-3 .0047µF C05 C 6807-9 .001µF C06 C 6806-1 .01µF C07 C 6807-9 .001µF C08 C 6809-5 220pF C09 C 6810-3 180pF DIODES D01 C 2851-1 1N4004 D02 C 2851-1 1N4004 D03 C 2851-1 1N4004 D04 C 2851-1 1N4004 D05 C 2851-1 1N4004 D06 C[...]

  • Page 24

    Micro-T ech 1200 Amplifier Service Manual 24 CAP ACITORS C01 C 3978-1 .047µF C02 C 3218-2 .22µF C03 C 3218-2 .22µF C04 C 8534-7 .0047µF C05 C 6807-9 .001µF C06 C 6806-1 .01µF C07 C 6807-9 .001µF C08 C 6810-3 180pF C09 C 6809-5 220pF DIODES D01 C 2851-1 1N4004 D02 C 2851-1 1N4004 D03 C 2851-1 1N4004 D04 C 2851-1 1N4004 D05 C 2851-1 1N4004 D06[...]

  • Page 25

    Micro-T ech 1200 Amplifier Service Manual 25 CAP ACITORS C01 C 8511-5 .047µF C02 C 7964-7 .22µF C03 C 7964-7 .22µF C04 C 8534-7 .0047µF C05 C 8534-7 .0047µF C06 C 6806-1 .01µF C07 C 6807-9 .001µF C08 C 6810-3 180pF C09 C 6809-5 220pF C43 C 6806-1 .01µF DIODES D01 C 2851-1 1N4004 D02 C 2851-1 1N4004 D03 C 2851-1 1N4004 D04 C 2851-1 1N4004 D0[...]

  • Page 26

    Micro-T ech 1200 Amplifier Service Manual 26 CAP ACITORS C01 C 8511-5 .047µF C02 C 7964-7 .22µF C03 C 7964-7 .22µF C04 C 8534-7 .0047µF C05 C 6807-9 .001µF C06 C 6806-1 .01µF C07 C 6807-9 .001µF C08 C 6810-3 180pF C09 C 6809-5 220pF C43 C 6806-1 .01µF DIODES D01 C 2851-1 1N4004 D02 C 2851-1 1N4004 D03 C 2851-1 1N4004 D04 C 2851-1 1N4004 D05[...]

  • Page 27

    Micro-T ech 1200 Amplifier Service Manual 27 CAP ACITORS C01 C 8511-5 .047µF C02 C 7964-7 .22µF C03 C 7964-7 .22µF C04 C 8534-7 .0047µF C05 C 8534-7 .0047µF C06 C 6806-1 .01µF C07 C 6807-9 .001µF C08 C 6810-3 180pF C09 C 6809-5 220pF C43 C 6806-1 .01µF DIODES D01 C 2851-1 1N4004 D02 C 2851-1 1N4004 D03 C 2851-1 1N4004 D04 C 2851-1 1N4004 D0[...]

  • Page 28

    Micro-T ech 1200 Amplifier Service Manual 28 CAP ACITORS C1 C 4303-1 1000uF C2 C 3913-8 470uF C3 C 4303-1 1000uF C4 C 6802-0 .47uF C100 C200 C 5053-1 18uF C101 C201 C 2821-4 10pF C103 C203 C 6805-3 .022uF C104 C204 C 6805-3 .022uF C105 C205 C 6950-7 82pF C106 C206 C 6950-7 82pF C108 C208 C 6812-9 47pF C112 C212 C 6803-8 .12uF C113 C213 C 6802-0 .47[...]

  • Page 29

    Micro-T ech 1200 Amplifier Service Manual 29 R116 R216 A10266-3351 3.3M R118 R218 A10266-2711 270 OHM R119 R219 A10266-3011 300 OHM R120 R220 A10266-2711 270 OHM R121 R221 C 5062-2 100K TRIM R122 R222 A10266-2741 270K R123 R223 A10266-1831 18K R124 R224 A10266-6821 6.8K R125 R225 C 7782-3 100 OHM R126 R226 C 7782-3 100 OHM R127 R227 A10266-6821 6.8[...]

  • Page 30

    Micro-T ech 1200 Amplifier Service Manual 30 CAP ACITORS C1 C 4303-1 1000µF C2 C 3913-8 470µF C3 C 4303-1 1000µF C4 C 6802-0 .47µF C5 C 6806-1 .01µF C6 C 6806-1 .01µF C100 C200 C 5311-3 22µF C101 C201 C 2820-6 5pF C103 C203 C 6805-3 .022µF C104 C204 C 6805-3 .022µF C105 C205 C 6812-9 47pF C106 C206 C 6812-9 47pF C108 C208 C 6814-5 12pF C11[...]

  • Page 31

    Micro-T ech 1200 Amplifier Service Manual 31 R5 A10266-3323 3.3K 1W R100 R200 C 7409-3 5K POT R101 R201 A10265-49911 4.99K R102 R202 A10266-1021 1K R103 R203 A10265-10031 100K 1% R104 R204 A10266-2721 2.7K R105 R205 A10266-2721 2.7K R106 R206 A10266-1231 12K R107 R207 A10266-4731 47K R108 R208 A10266-1021 1K R109 R209 A10266-8201 82 O HM R110 R210 [...]

  • Page 32

    Micro-T ech 1200 Amplifier Service Manual 32 CAP ACITORS C1 C 3913-8 470µF C2 C 3913-8 470µF C4 C 6802-0 .47µF C5 C 6806-1 .01µF C6 C 6806-1 .01µF C7 C 6094-9 33µF C8 C 6806-1 .01µF C100 C200 C 5311-3 22µF C101 C201 C 2820-6 5pF C103 C203 C 6805-3 .022µF C104 C204 C 6804-6 .1µF C105 C205 C 6812-9 47pF C106 C206 C 6812-9 47pF C108 C208 C 6[...]

  • Page 33

    Micro-T ech 1200 Amplifier Service Manual 33 Q116 Q216 C 3786-8 PN4250A Q117 Q217 D 2961-7 2N3859A Q118 Q218 D 2961-7 2N3859A Q119 Q219 C 3625-8 2N4125 Q120 Q220 C 3625-8 2N4125 Q121 Q221 C 7458-0 2N4123 Q122 Q222 C 7458-0 2N4123 RESISTORS R1 A10265-53621 53.6K R2 A10266-2402 24 O HM R3 A10266-2402 24 O HM R4 A10265-46421 46.4K R5 A10266-3321 3.3K [...]

  • Page 34

    Micro-T ech 1200 Amplifier Service Manual 34 INTEGRA TED CIRCUITS U1 C 5095-2 MC7815 U2 C 5096-0 MC7915 U100 U200 C 6911-9 UP A75 PNP U103 U203 C 6910-1 UP A76 NPN U104 U204 C 6900-2 MC34084P CONNECTORS J1 C 7593-4 HDR, 5 PIN J2 C 4508-5 16 PIN Soc J9 C 7527-2 HDR, 6 PIN J10 C 7592-6 HDR, 4 PIN J11 C 7526-4 HDR, 3 PIN J100 J200 C 6777-4 PH. JACK J5[...]

  • Page 35

    Micro-T ech 1200 Amplifier Service Manual 35 Q42980-5 Main Module (D7911-7 board) Parts List CAP ACITORS C1 C 4303-1 1000µF C2 C 3913-8 470µF C4 C 6802-0 .47µF C5 C 6806-1 .01µF C6 C 6806-1 .01µF C7 C 6804-6 .1µF C100 C200 C 5311-3 22µF C101 C201 C 2821-4 10pF C103 C203 C 6805-3 .022µF C104 C204 C 6805-3 .022µF C105 C205 C 6812-9 47pF C106[...]

  • Page 36

    Micro-T ech 1200 Amplifier Service Manual 36 Q117 Q217 D 2961-7 2N3859A Q118 Q218 D 2961-7 2N3859A Q119 Q219 C 3625-8 2N4125 Q120 Q220 C 3625-8 2N4125 Q121 Q221 C 7458-0 2N4123 Q122 Q222 C 7458-0 2N4123 Q123 Q223 C 7458-0 2N4123 Q124 Q224 C 3625-8 2N4125 RESISTORS R1 A10265-53621 53.6K R2 A10266-2402 24 O HM R3 A10266-2402 24 O HM R4 A10265-46421 4[...]

  • Page 37

    Micro-T ech 1200 Amplifier Service Manual 37 R188 R288 A10266-3631 36K R189 R289 A10266-2731 27K R190 R290 A10266-2051 2M R191 R291 A10266-3331 33K R192 R292 A10266-1031 10K R193 R293 A10266-1031 10K R194 R294 A10266-1041 100K R195 R295 A10266-3021 3K R196 R296 A10266-4721 4.7K R197 R297 A10266-1031 10K R198 R298 A10266-4721 4.7K R199 R299 A10266-1[...]

  • Page 38

    Micro-T ech 1200 Amplifier Service Manual 38 Q43035-7 Main Module (D7993-5 board) Parts List CAPACITORS C1 C 4303-1 1000µF C2 C 3913-8 470µF C4 C 6802-0 .47µF C5 C 6806-1 .01µF C6 C 6806-1 .01µF C7 C 8897-8 .1µF C100 C200 C 5311-3 22µF C101 C201 C 2821-4 10pF C103 C203 C 6805-3 .022µF C104 C204 C 6805-3 .022µF C105 C205 C 6812-9 47pF C106 [...]

  • Page 39

    Micro-T ech 1200 Amplifier Service Manual 39 Q43035-7 Main Module (D7993-5 board) Parts List Cont. Q122 Q222 C 7458-0 NPN 2N4123 Q123 Q223 C 7458-0 NPN 2N4123 Q124 Q224 C 3625-8 NPN 2N4125 RESISTOR NETWORKS N101 N201 D 7946-3 Resistor Network N102 N202 D 6082-8 Resistor Network RESISTORS R1 A10265-53621 53.6K 1% R2 C 7340-0 24 5W R3 C 7340-0 24 5W [...]

  • Page 40

    Micro-T ech 1200 Amplifier Service Manual 40 Q43035-7 Main Module (D7993-5 board) Parts List Cont. R188 R288 A10266-3631 36K R189 R289 A10266-2731 27K R190 R290 A10266-2051 2M R191 R291 A10266-3331 33K R192 R292 A10266-1031 10K R193 R293 A10266-1031 10K R194 R294 A10266-1041 100K R195 R295 A10266-3021 3K R196 R296 A10266-4721 4.7K R197 R297 A10266-[...]

  • Page 41

    Micro-T ech 1200 Amplifier Service Manual 41 Q43031-6 Main Module (D7993-5 board) Parts List CAPACITORS C1 C 4303-1 1000µF C2 C 3913-8 470µF C4 C 6802-0 .47µF C5 C 6806-1 .01µF C6 C 6806-1 .01µF C7 C 8897-8 .1µF C100 C200 C 5311-3 22µF C101 C201 C 9464-6 10pF C103 C203 C 6805-3 .022µF C104 C204 C 6805-3 .022µF C105 C205 C 6812-9 47pF C106 [...]

  • Page 42

    Micro-T ech 1200 Amplifier Service Manual 42 Q43031-6 Main Module (D7993-5 board) Parts List Cont. Q122 Q222 C 7458-0 NPN 2N4123 Q123 Q223 C 7458-0 NPN 2N4123 Q124 Q224 C 3625-8 NPN 2N4125 RESISTOR NETWORKS N101 N201 D 7946-3 Resistor Network N102 N202 D 6082-8 Resistor Network RESISTORS R1 A10265-53621 53.6K 1% R2 C 7340-0 24 5W R3 C 7340-0 24 5W [...]

  • Page 43

    Micro-T ech 1200 Amplifier Service Manual 43 Q43031-6 Main Module (D7993-5 board) Parts List Cont. R188 R288 A10266-3631 36K R189 R289 A10266-2731 27K R190 R290 A10266-2051 2M R191 R291 A10266-3331 33K R192 R292 A10266-1031 10K R193 R293 A10266-1031 10K R194 R294 A10266-1041 100K R195 R295 A10266-3021 3K R196 R296 A10266-4721 4.7K R197 R297 A10266-[...]