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Table of Contents
Related Manuals for Carver M240
Summary of Contents for Carver M240
- Page 1 M240 Mobile Magnetic Field Amplifier SERVICE MANUAL...
- Page 2 Any person performing the procedures described in this manual will be exposed to hazardous voltages and risk of electric shock. Carver Corporation assumes that any person who removes the cover from the unit has been properly trained in protecting against avoidable injury.
- Page 3 CARVER CORPORATION SERVICE BULLETIN " " 1----·-- Sf.'�rvice � M-240-2 Serial Bulletin ·-'1 ?a so n : available. Parts MJE4340 MJE4350 are no longer !Procedure: tran s i s tors nee d the s e b e r ep l ace d :...
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Page 5: Table Of Contents
M240 Block Diagram ....... 3 M240 Schematic Diagram ....4 verification tests. -
Page 6: Technical Description
The input sensitivity of the M240 amplifier is The Mono Switch (SW3) controls whether or not further controlled by two potentiometers. RPI the M240 will operate in mono or stereo mode. controls the sensitivity of both high- and low-level Depress the switch for bridged mono operation;... -
Page 7: List Of Figures 1. M240 Block Diagram
WIRE PAD. �EFER. TO PC.B ASSEMBL\ IN')TRUC f ION FOR FAD LOLATIOCj. -3'N �UPVLY NE:G COMM,LJTA'TOR 2 M240 Figure Schematic Diagram 3.3/( Tfl!S 6"1'-0VND MECH AN I CA LL\ ��� � :. �;.� : �::� � � "' CAR - V ER COP-.. P OF\ATION (.. -
Page 8: M240 Schematic Diagram
OUTPUT C OMMU - _ 39y DRIVER -39V TATOR D R IVER Figure M240BlockDiagram .._. - ,, ..CONTRACT NO CARVER COR?ORt\\\O�\ APPROVALS O.ITE "p \YIC GU IK DRA W MANUAL CAR AMP �)ER\llCE CHECKllED FSCM REV. ISSUED SCALE�(_... -
Page 9: Input Muting And Protection Circuits
Technical Description • AMPL.. l F1ER /I OUTPUT ( F\.. A \) Fi g ure Frequency Response Graph Supply. The circuit is described in detai l below Input Muting and under the heading Peripheral Circuitry. Protection Circuits Muting of the amplifier circuits occurs during the Excessive Current following situations: Excessive current is detected by monitoring the... -
Page 10: Power Amplifiers
Q207) is provided by 0206, Q208, and 0207, channel can be calculated by adding "100" to the Q210. (Refer to Input Muting and Protection corresponding left channel reference designator. Circuits above for a discussion of how the M240 Mobile Magnetic Field Amplifier... -
Page 11: Commutator Threshhold
Technical Description I khz sw - auto sw-outo I khz I.() ..c..D Commutator Afaximum Output@ 1 KHz Figure 4 Commutator Threshhold Figure amplifier circuit is protected from excessive 10 khz sw -auto current and excessive high frequencies). Clamp diodes, D209 and D210, prevent the audio .. -
Page 12: Pulse Width Modulating Power Supply
Pulse Width Modulating SE3524 Pulse Width Modulating Regulator Power Supply controls the operation of the switching supply. The M240 amplifier is designed for use in a 12 Service Bulletins for (Refer to the section titled vdc negative ground system. It converts... -
Page 14: Switcher Driver
Switcher Driver, Minimum Duty Cycle Error Amplifier. The error amplifier is a simple The Remote Tum On terminal allows the M240 differential-input, transconductance amplifier. The Car Amplifier to be turned on by the car radio. Power up is delayed by Rl, R2, R3, R4, Cl, Dl, output is the compensation terminal, pin 9, which Q2, thereby allowing a "soft"... -
Page 15: Calibration And Performance Testing
Calibration and Performance Testing When QS is turned on, Q7, Q8, and Q9 turn on, Required Equipment allowing current to flow through primary winding In addition to standard audio electronic test D-M of the transfolll1 e r. When Q6 is turned on, equipment, you will need a power Supply either Q lO, Q l 1, and Q12 turn on and current flows an Astron RS50 or an equivalent model. -
Page 16: Bias Adjustment
Verify -3 dB± 1 dB @ 127 Hz. Verify -3 dB ±1 dB @ 30 kHz Verify high level input is down 15.5 dB ±ldB Verify signal level is down 6 dB± I dB with M240 Mobile Magnetic Field Amplifier... -
Page 17: Commutator Threshhold
Calibration and Performance Testing Commutator Threshold Verify that the commutator wavefonns on Pads match those of Figure 5. Refer to Figure 4 during this test. Repeat Steps 1 and 2 at 20 Hz. Refer to Figure 5 for the appropriate wavefonns. Set Up Conditions: Leave Hi-Level Select Switch out Repeat Steps 1 and 2 at 10 kHz. -
Page 18: Noise
Pulse Width Modulating Supply The following bulletins describe changes in the engineering order has been issued to prevent original design of the M240 amplifier, as well the 3524 from entering a disallowed state when the suggestions on repairing common malfunctions. -
Page 19: Replacement Of 3524 Chip
Service Bulletins To install new potentiometers in existing boards, 36K 1/4W enlarge the lead holes to 0.046 inches. PIN 251-00107-00 Re p laced by: Part Substitutions 16K l/4W Motorola MPS2979 has been used as a substitute PIN 251-00099-00 for Motorola MPS 6729, PIN 321-10001-00. (See Q201, 205, 301, and 305.) Replacement of the SE3524... -
Page 20: Parts List
Parts Parts The following pages contain a complete parts list for the M240 Mobile Magnetic Field Amplifier. The parts are grouped by type : resistors, capacitors, diodes, transistors, integrated circuits, hardware, miscellaneous items, and shipping kit. Within groups, parts are listed in order by part number. - Page 21 Parts Resistors (Continued) Part Number Reference Designators RES CFILM 82 K l/4W PREP .4 R214,314 251-00116-00 RES CFILM 91 K 1/4W PREP .4 R34,45 251-00117-00 251-00119-00 RES CFILM 110 K l/4W PREP .4 R60,73 RES CFILM 130 K l/4W PREP .4 R70,85 251-00121-00 RES CFI L M 220 K 1/4 W PREP .4...
- Page 22 XISTOR T0218AA NPN TIP 35B Q7,8,9,10,l l,12 321-80001-00 XISTORT0218AA NPN MJE 4340 Q207,307 XISTOR T0218AA PNP MJE 4350 Q206,306 321-80002-00 Integrated Circuits Reference Designators Part Number 330-30003-00 IC QUAD OP AMP (4136) Ul,2,3 330-60004-00 VOLT AGE REG. SWITCHING SE3524 M240 Mobile Magnetic Field Amplifier...
- Page 23 Parts Hardware Reference Designators Part Number BARRIER S'IRIP 3 POS 90 DEG MNT 1 101-00002-00 KEPNUT 6-32X5/16 ZC 152-10002-00 152-10001-00 KEPNUT 440 ZC SCREW MACH PP BLK 6-32 X 1/2 151-20053-00 SCREW MACH PP SS 6-32Xl/2 151-20053-05 SCREW SHT MTL PP BLK 6Xl/4 "B" 151-30051-00 SCREW SHT MTL PP BLK 4X3/8 "A"...
- Page 24 BAG PLASTIC 10"Xl6" CAR AMP 532-10011-00 BOX M BL MAG AMP 532-20017-00 F OAM END BLOCK MBL M AG AMP 532-30013-00 MANUAL CAR AMP 990-20016-00 M 240 MOBILE M AGNETIC F IELD AMPLIFIER SERVICE MANUAL 990-20016-01 M240 Mobile Magnetic Field Amplifier...
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Page 26: Pcb Assembly Diagram, Sheet 2
CD .. O F' a> I OM APPLY HEAISlNK l"iE F O RE @M\CA WA��- E �A"RD INSTA �c ADHERE • (3:> CARVER L l"AK � �� © PI N � c f"RlOR BOARD • CS> CONNECT FUSEHOLDER A'.5 SHOW �:... - Page 27 ITEM DESCRI PT ION 601 - 00376-00 109- 10005 - 00 PHONO JACK SM , QUAD PC MOU N T 318 - 10008 - 00 319- 00028-00 BRIDGE 200V SA FAST RECO 320-2000 1 - 03 DIODE IN4 148 UNPREP 2N6488 321 - 60004-00 X I STOR...
- Page 29 � Q.305 - M PS fo 7 Z. � IDE {FLAT R E G.' D 2 9 M f tl 50�7 2.. 2:; O.. �O � - (FLAT "'Jl�E U P) 29 3 R.EO.. D Q 2. 0 S - M P 5 f0 1 Z ':?J ZS �...
- Page 30 IP, GA WHT 5 Y +" '10 1 - 10l 5 3 - 00 � lb 6A RED "10 1 - 10057-00 �---�" "' '" GA BLK 40 1 - 100 5 2 - oo COMPON E NT �IDE. l�GA �D -v z.N NOTE.
- Page 31 CARVER COR P ORATION SER VICE BULLE T I N '--·· ! S �-:< r v i c e ?d S O n : Part s MJE4340 a n d MJE4350 a r e n o lo n ge r...
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