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Crown Audio 2400 manual

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Table of contents for the manual

  • Page 1

    Micro-T ech 2400 Amplifier Service Manual 1 MICRO-TECH ® -2400 PO WER AMPLIFIER SER VICE MANU AL K-SVCMT24 7-95 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 2400 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 2400 Amplifier Service Manual 3 Introduction ............................................................. 4 Scope ...................................................................... 4 Warranty .................................................................. 4 Parts Information ..................................................... [...]

  • Page 4

    Micro-T ech 2400 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 2400 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 2400 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 2400 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 a voltage selection board. This version is to be used only with 120 V olts and only with 60Hz. All other versions of the Micro T ech 2400 use a volt- age selection board. The following c[...]

  • Page 8

    Micro-T ech 2400 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 2400 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 2400 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 2400 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 2400 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 2400 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 2400 Amplifier Service Manual 14 TEST 6: VOLTAGE GAIN Spec 26dB Gain: Gain of 20.0 ±3%. Spec 0.775V Sensitivity: ±6%. Spec 1.4V Sensitivity: +12%/–6%. Initial Conditions: Controls per standard. Procedure: No load connected. Inject a 0.775 VAC 1 kHz sine wave with the Sensitivity Switch in the 26 dB position. Measure 15.5 VAC ±0.5 V[...]

  • Page 15

    Micro-T ech 2400 Amplifier Service Manual 15 Electrical Checkout Procedures Procedure Short: Inject a 60 Hz sine wave at 5 VAC minimum output. After establishing signal, short the output for 10 seconds. TEST 14: ODEP LIMITING Spec: No oscillation on ODEP Limiting wave form; either channel controls limiting in Parallel Mono Mode. Initial Conditions:[...]

  • Page 16

    Micro-T ech 2400 Amplifier Service Manual 16 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 K80603-2 MT Series Owners Manual 1 POWER SUPPLY CP N ITEM QTY D 7975-2 Power Cord (US Models) 1 A10793-0503G Power Cord (Eur opean p[...]

  • Page 17

    Micro-T ech 2400 Amplifier Service Manual 17 Parts List (Non-Module) OUTPUT ASSEMBL Y CONT . (ONE PER CHANNEL) CPN ITEM QTY(PER CHANNEL) D 7665-9 Clip, TO-3P Mounting 2 D 7666-7 Bracket, TO-3P Heatsink 2 C 8813-5 Q318/Q418 Bias Servo MPSA18/MPS8097 1 B 5842-8 T ubing, #23 TFE Thin W all Red (For C 8813-5) Request in Inches C 5826-0 S100/S200 Ther m[...]

  • Page 18

    Micro-T ech 2400 Amplifier Service Manual 18 Parts List (Non-Module) MAIN CHASSIS ASSEMBLY CP N ITEM QTY D 8501-5 Cover , T op 1 D 8548-6 Cover , Bottom 1 A10110-70605 Screw , 6-32-.312 T aptite Ph (Covers) 16 M21447J3 Main Chassis 1 MISCELLANEOUS CP N ITEM QTY A10110-70812 8-32 x .750 T aptite Pnhd Screw 2 A10094-3 W asher , #6 Black Star 3 A10109[...]

  • Page 19

    Micro-T ech 2400 Amplifier Service Manual 19 Module Information MODULE HISTORY The Micro Tech 2400 amplifier was introduced in January of 1995. 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, July 1995. OUTPUT MODULES: (left and right are id[...]

  • Page 20

    Micro-T ech 2400 Amplifier Service Manual 20 M46330-3 FUSE MODULE 2 C 5060-6 PC Mount Fuse Clip 11 C 7817-7 T ab, AMP .25 Faston PC Mount 1 P10425-0 MT -2400 Fuse Boar d For replacement fuse see Power Supply Parts List on page 16. Q43327-8 DISPLA Y MODULE CAP ACITORS C503 C603 C 6806-1 .01µF C507 C607 C 6809-5 220pF C701 C 6802-0 .47µF C702 C 680[...]

  • Page 21

    Micro-T ech 2400 Amplifier Service Manual 21 Q43354-2 Output Module Parts List (P10429-2 Board) Q43354-2 Output Module for MT-2400. For Schematic See J0658-5 CAPACITORS C01 C 8511-5 .047µF C02 C 8426-6 .1µF C03 C 8426-6 .1µF C04 C 6806-1 .01µF C05 C 6806-1 .01µF C06 C 6806-1 .01µF C07 C 6807-9 .001µF C08 C 6810-3 180pF C09 C 6809-5 220pF C43[...]

  • Page 22

    Micro-T ech 2400 Amplifier Service Manual 22 Q43328-6 Main Module Parts List (D8679-9 Board) Q43328-6 MT -2400 ORIGINAL MAIN MODULE Use Schematic J 0658-5 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 8897-8 .1µF C8 C 5362-6 2.2uF C100 C200 C 5311-3 22µF C101 C201 C 9464-6 10pF C10[...]

  • Page 23

    Micro-T ech 2400 Amplifier Service Manual 23 RESISTOR NETWORKS N101 N201 D 7944-8 Res. Net. N102 N202 D 6082-8 Res. Net. TRANSISTORS Q100 Q200 D 2961-7 2N3859A Q101 Q201 C 3578-9 MPSA93 Q102 Q202 C 3810-6 MPSA43 Q103 Q203 C 3786-8 PN4250 Q105 Q205 C 3578-9 MPSA93 Q106 Q206 C 3625-8 2N4125 Q107 Q207 C 3786-8 PN4250 Q108 Q208 C 5891-4 MTS105 Q109 Q20[...]

  • Page 24

    Micro-T ech 2400 Amplifier Service Manual 24 R153 R253 A10124-24 JUMPER R154 R254 A10266-5601 56 R155 R255 A10266-1321 1.3K R156 R256 A10266-1321 1.3K R157 R257 A10266-1321 1.3K R158 R258 A10265-11321 11.3K R159 R259 A10265-10011 1K 1 % R160 R260 A10266-5601 56 R161 R261 A10266-4701 47 R162 R262 A10266-4701 47 R163 R263 A10266-5601 56 R164 R264 A10[...]

  • Page 25

    Micro-T ech 2400 Amplifier Service Manual 25 J500 J800 D 8681-5 10 In. RBN J600 J700 D 8680-7 6 In. RBN HW5-8 C 8812-7 5.5" Cbl Tie Z1-Z5 OPEN Q43328-6 Main Module Parts List Cont. (D8679-9 Board)[...]

  • Page 26

    Micro-T ech 2400 Amplifier Service Manual 26 Q43399-7 Main Module Parts List (D8827-4 Board) Q43399-7 MT -2400 MAIN MODULE Use Schematic J 0691-6 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 8897-8 .1µF C8 C 5362-6 2.2uF C100 C200 C 5311-3 22µF C101 C201 C 9464-6 10pF C102 C202 C [...]

  • Page 27

    Micro-T ech 2400 Amplifier Service Manual 27 RESISTOR NETWORKS N101 N201 D 7944-8 Res. Net. N102 N202 D 6082-8 Res. Net. TRANSISTORS Q100 Q200 D 2961-7 2N3859A Q101 Q201 C 3578-9 MPSA93 Q102 Q202 C 3810-6 MPSA43 Q103 Q203 C 3786-8 PN4250 Q105 Q205 C 3578-9 MPSA93 Q106 Q206 C 3625-8 2N4125 Q107 Q207 C 3786-8 PN4250 Q108 Q208 C 5891-4 MTS105 Q109 Q20[...]

  • Page 28

    Micro-T ech 2400 Amplifier Service Manual 28 R149 R249 C 8836-6 100 .5W FP R150 R250 A10266-2721 2.7K R151 R251 A10266-1231 12K R152 R252 A10265-11521 11.5K 1% R153 R253 A10124-24 JUMPER R154 R254 A10266-5601 56 R155 R255 A10266-1321 1.3K R156 R256 A10266-1321 1.3K R157 R257 A10266-1321 1.3K R158 R258 A10265-11321 11.3K R159 R259 A10265-10011 1K 1 [...]

  • Page 29

    Micro-T ech 2400 Amplifier Service Manual 29 U103A U203A OPEN MISC. Board D 8827-4 Socket C 3450-1 14 Pin HW9-10 C 9494-3 Heatsinks HW11-15 C 9944-7 Nyl. Spacer J1 C 7593-4 5 Pin HDR J2 C 4508-5 16 Pin J11 C 7526-4 3 Pin HDR J12 Not Used J100 J200 C 6777-4 Ph. Jack Cover C 6778-2 Ph Jk CVR J101 J201 Not Used J500 J800 D 8681-5 10 In. RBN J600 J700 [...]