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Micro-Tech 1200 Amplifier Service Manual1MICRO-TECH®-1200POWER AMPLIFIERSERVICE MANUALK-SVCMT128-95Micro-Tech®, ODEP® and Crown® are registered trade

Micro-Tech 1200 Amplifier Service Manual10High Side (HS)The High Side (HS) of the bridge operates much likea conventional bipolar push-pull output con

Micro-Tech 1200 Amplifier Service Manual11respect to each other. This allows the power supply todeliver +Vcc and -Vcc from the same bridge rectifieran

Micro-Tech 1200 Amplifier Service Manual12TheoryNEGATIVELOW SIDEOUTPUTPNP STAGEPOSITIVELOW SIDEOUTPUTNPN STAGENEGATIVEHIGH SIDEOUTPUTPNP STAGEPOSITIVE

Micro-Tech 1200 Amplifier Service Manual13Electrical Checkout ProceduresGENERAL INFORMATIONThe following test procedures are to be used to verifyopera

Micro-Tech 1200 Amplifier Service Manual14TEST 4: AC POWER DRAWSpec: 100 Watts maximum quiescent.Initial Conditions: Controls per standard.Procedure:

Micro-Tech 1200 Amplifier Service Manual15Electrical Checkout ProceduresSpec at 4 Ohm Stereo: >= 470W at 0.1% THD.Spec at 2 Ohm Stereo: >= 600W

Micro-Tech 1200 Amplifier Service Manual16Spec: No dangerous transients.Initial Conditions: Controls per standard.Procedure: From an on condition, tur

Micro-Tech 1200 Amplifier Service Manual17Parts List (Non-Module)SUPPLIMENTAL ITEMSCPN ITEM QTYD 4137-2 Nylon Thumbscrew Washer 4C 3342-0 Feet, Black

Micro-Tech 1200 Amplifier Service Manual18Parts List (Non-Module)OUTPUT ASSEMBLY (CONT.)CPN ITEM QTY (ONE PER CHANNEL)D 8774-8 PTC, 95 Deg. Thermal Se

Micro-Tech 1200 Amplifier Service Manual19Parts List (Non-Module)MAIN CHASSIS ASSEMBLY (CONT.)CPN ITEM QTY.A10110-70605 Screw, 6-32-.312 Taptite Ph (C

Micro-Tech 1200 Amplifier Service Manual2À PRÉVENIR LE CHOCÉLECTRIQUE N’ENLEVEZPAS LES COUVERTURES.RIEN DES PARTIESUTILES À L’INTÉRIEUR.DÉBRANCHER LA

Micro-Tech 1200 Amplifier Service Manual20Module and Schematic InformationMODULE HISTORYThe Micro Tech 1200 amplifier was introduced inJanuary 1986. S

Micro-Tech 1200 Amplifier Service Manual21Fuse and Display Module Parts ListsQ43061-3 ODEP DISPLAY MODULECAPACITORSC503 C603 C 6806-1 .01µF 100VC507 C

Micro-Tech 1200 Amplifier Service Manual22CAPACITORSC01 C 3978-1 .047µFC02 C 6804-6 .1µFC03 C 6804-6 .1µFC04 C 3996-3 .0047µFC05 C 6807-9 .001µFC06 C

Micro-Tech 1200 Amplifier Service Manual23CAPACITORSC01 C 3978-1 .047µFC02 C 6804-6 .1µFC03 C 6804-6 .1µFC04 C 3996-3 .0047µFC05 C 6807-9 .001µFC06 C

Micro-Tech 1200 Amplifier Service Manual24CAPACITORSC01 C 3978-1 .047µFC02 C 3218-2 .22µFC03 C 3218-2 .22µFC04 C 8534-7 .0047µFC05 C 6807-9 .001µFC06

Micro-Tech 1200 Amplifier Service Manual25CAPACITORSC01 C 8511-5 .047µFC02 C 7964-7 .22µFC03 C 7964-7 .22µFC04 C 8534-7 .0047µFC05 C 8534-7 .0047µFC06

Micro-Tech 1200 Amplifier Service Manual26CAPACITORSC01 C 8511-5 .047µFC02 C 7964-7 .22µFC03 C 7964-7 .22µFC04 C 8534-7 .0047µFC05 C 6807-9 .001µFC06

Micro-Tech 1200 Amplifier Service Manual27CAPACITORSC01 C 8511-5 .047µFC02 C 7964-7 .22µFC03 C 7964-7 .22µFC04 C 8534-7 .0047µFC05 C 8534-7 .0047µFC06

Micro-Tech 1200 Amplifier Service Manual28CAPACITORSC1 C 4303-1 1000uFC2 C 3913-8 470uFC3 C 4303-1 1000uFC4 C 6802-0 .47uFC100 C200 C 5053-1 18uFC101

Micro-Tech 1200 Amplifier Service Manual29R116 R216 A10266-3351 3.3MR118 R218 A10266-2711 270 OHMR119 R219 A10266-3011 300 OHMR120 R220 A10266-2711 27

Micro-Tech 1200 Amplifier Service Manual3Introduction ...4Scope...

Micro-Tech 1200 Amplifier Service Manual30CAPACITORSC1 C 4303-1 1000µFC2 C 3913-8 470µFC3 C 4303-1 1000µFC4 C 6802-0 .47µFC5 C 6806-1 .01µFC6 C 6806-1

Micro-Tech 1200 Amplifier Service Manual31R5 A10266-3323 3.3K 1WR100 R200 C 7409-3 5K POTR101 R201 A10265-49911 4.99KR102 R202 A10266-1021 1KR103 R203

Micro-Tech 1200 Amplifier Service Manual32CAPACITORSC1 C 3913-8 470µFC2 C 3913-8 470µFC4 C 6802-0 .47µFC5 C 6806-1 .01µFC6 C 6806-1 .01µFC7 C 6094-9 3

Micro-Tech 1200 Amplifier Service Manual33Q116 Q216 C 3786-8 PN4250AQ117 Q217 D 2961-7 2N3859AQ118 Q218 D 2961-7 2N3859AQ119 Q219 C 3625-8 2N4125Q120

Micro-Tech 1200 Amplifier Service Manual34INTEGRATED CIRCUITSU1 C 5095-2 MC7815U2 C 5096-0 MC7915U100 U200 C 6911-9 UPA75 PNPU103 U203 C 6910-1 UPA76

Micro-Tech 1200 Amplifier Service Manual35Q42980-5 Main Module (D7911-7 board) Parts ListCAPACITORSC1 C 4303-1 1000µFC2 C 3913-8 470µFC4 C 6802-0 .47µ

Micro-Tech 1200 Amplifier Service Manual36Q117 Q217 D 2961-7 2N3859AQ118 Q218 D 2961-7 2N3859AQ119 Q219 C 3625-8 2N4125Q120 Q220 C 3625-8 2N4125Q121 Q

Micro-Tech 1200 Amplifier Service Manual37R188 R288 A10266-3631 36KR189 R289 A10266-2731 27KR190 R290 A10266-2051 2MR191 R291 A10266-3331 33KR192 R292

Micro-Tech 1200 Amplifier Service Manual38Q43035-7 Main Module (D7993-5 board) Parts ListCAPACITORSC1 C 4303-1 1000µFC2 C 3913-8 470µFC4 C 6802-0 .47µ

Micro-Tech 1200 Amplifier Service Manual39Q43035-7 Main Module (D7993-5 board) Parts List Cont.Q122 Q222 C 7458-0 NPN 2N4123Q123 Q223 C 7458-0 NPN 2N4

Micro-Tech 1200 Amplifier Service Manual4CrownTechnical Support GroupFactory ServiceParts DepartmentMailing Address:PO Box 1000Elkhart, IN USA 46515

Micro-Tech 1200 Amplifier Service Manual40Q43035-7 Main Module (D7993-5 board) Parts List Cont.R188 R288 A10266-3631 36KR189 R289 A10266-2731 27KR190

Micro-Tech 1200 Amplifier Service Manual41Q43031-6 Main Module (D7993-5 board) Parts ListCAPACITORSC1 C 4303-1 1000µFC2 C 3913-8 470µFC4 C 6802-0 .47µ

Micro-Tech 1200 Amplifier Service Manual42Q43031-6 Main Module (D7993-5 board) Parts List Cont.Q122 Q222 C 7458-0 NPN 2N4123Q123 Q223 C 7458-0 NPN 2N4

Micro-Tech 1200 Amplifier Service Manual43Q43031-6 Main Module (D7993-5 board) Parts List Cont.R188 R288 A10266-3631 36KR189 R289 A10266-2731 27KR190

Micro-Tech 1200 Amplifier Service Manual5Parts Informationshipment on a C.O.D. or pre-payment (check or creditcard) basis.TERMSNormal terms are pre-pa

Micro-Tech 1200 Amplifier Service Manual6SpecificationsUnless noted otherwise, all specifications are basedon driving an 8 ohm load per channel, both

Micro-Tech 1200 Amplifier Service Manual7Voltage ConversionThe 120 Volt 60 Hz version, sold in the United States,is not voltage selectable. It does no

Micro-Tech 1200 Amplifier Service Manual8TheoryOVERVIEWIt should be noted that over time Crown makes im-provements and changes to their products for v

Micro-Tech 1200 Amplifier Service Manual9Theoryamplifies the difference between input and outputsignals, any difference in the two waveforms willprodu