Arcam-A32-int-sm维修电路原理图.pdf

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1、A32FMJ A32, P35 & P35/3Amplifi ers Service Manual ARCAMARCAMIssue 1.0RadioFans.CN 收音机爱 好者资料库Contents List ! Phono board L870 oCircuit description oComponent overlay oParts list oCircuit diagrams ! Amplifier & PSU board L882 oCircuit description oComponent overlay oParts list oCircuit diagrams ! Disp

2、lay board L928 oComponent overlay oParts list oCircuit diagrams ! Preamplifier board L937 oCircuit description oComponent overlay oParts list oCircuit diagrams ! 3rd Channel Amplifier board L911 oComponent overlay oParts list oCircuit diagrams ! Transformer specifications oL914TX oL915TX ! General a

3、ssembly oA32 - Mechanical parts list oP35 - Mechanical parts list oP35/3 - Mechanical parts list RadioFans.CN 收音机爱 好者资料库 Phono Board L870 Contents ! Circuit description ! Component overlay ! Parts list ! Circuit diagrams AV8 Phono Board Circuit Description Refer to circuit diagram L870 sheet 1 The p

4、hono board is a simple single stage RIAA amplifier and consists of two channels of high gain amplification, and the ability to switch between moving magnet (MM) and moving coil (MC) settings. PSU The unit derives its + 15V regulated rails from the unit it is fitted into with only local decoupling ca

5、pacitors on board. Interface The unit connects to the host unit via a 8 way connector. Amplification The left channel has designators beginning with 100, and the right with 200. For the purposes of this description the left channel will be described, as the right channel is the same in all respects.

6、 The amplifier is a small signal class A voltage feedback amplifier with switch able gain. The input consists of an actively loaded differential pair of very low noise PNP transistors (TR106, TR107). These transistors are very specific and should only be replaced with identical parts with the E grad

7、e high gain. TR100 and TR101 form a current source for the pair, which sets the quiescent current for the entire amplifier. The active load consists of TR110 and TR111, which forms part of the differential current mirror with TR112, TR113 & TR114. This differential stage also has an active load (TR1

8、02 & TR103) to keep gain to a maximum. Both of these differential stages are designed to have as much gain as possible to enable the single stage design. The RIAA response is achieved in the feedback network: C101, C110, C111, C112, C119, C120 and R115, R112. C115 is used to correct between MM and M

9、C gains as the amplifier is non-inverting. SW100 switches between MM and MC. Two poles of the switch change between the different loading required for each type of the cartridge: R108 & C109 for MM and added in parallel for MC R104 & C108. The other two poles change the feedback resister value to al

10、ter the gain: R105 for MM and added in parallel for MC R123. The DC offset is controlled by a non-inverting servo built around IC100. The amount of servo current is different for each gain setting via R111 (MM) and R124 (MC) so that the low frequency high pass point remains the same for both setting

11、s. However the high pass point for the circuit is set by C113. This gives a warp filter, stops DC start-up thumps from upsetting DC coupled circuitry and an approximation of the RIAA/IEC curve (-2dB 20Hz) The output is class A buffered by a dual mirror follower (TR104, TR105, TR108, TR109). The quie

12、scent current is set by D100 and R118 and R119. Closed loop stability is achieved with C16, C117, giving symmetrical slewing capability. L870 Phono Board Parts List Issue 2.0Designator Part DescriptionC12A410CERD 100N 63V -20% +80% RAC1002N622ELST 22U 63VC1012D210PPRO 1N0 5% 63V RAC1022P710ASELEC 10

13、0U 25V SILMICC1032P710ASELEC 100U 25V SILMICC1042K410PEST 100N 63V 10%C1052K410PEST 100N 63V 10%C1062K410PEST 100N 63V 10%C1072K410PEST 100N 63V 10%C1082D147WPPRO W 470P 63V 5% RAC1092D110WPPRO W 100P 63V 5% RAC1102D247NPPRO 4N7 63V 5% RAC1112D310PPRO 10N 63V 1% AXIALC1122D310PPRO 10N 63V 1% AXIALC1

14、132K510CAP MKS2 1U0 16V 10%C1152D213NPPRO 1N3 63V 5% RAC1162D147WPPRO W 470P 63V 5% RAC1172D147WPPRO W 470P 63V 5% RAC1182U610ELST NON POLAR 10UF 35VC1192D110NPPRO 100P 63V 5% RAC1202D210PPRO 1N0 5% 63V RAC2002N622ELST 22U 63VC2012D210PPRO 1N0 5% 63V RAC2022P710ASELEC 100U 25V SILMICC2032P710ASELEC

15、100U 25V SILMICC2042K410PEST 100N 63V 10%C2052K410PEST 100N 63V 10%C2062K410PEST 100N 63V 10%C2072K410PEST 100N 63V 10%C2082D147WPPRO W 470P 63V 5% RAC2092D110WPPRO W 100P 63V 5% RAC2102D247NPPRO 4N7 63V 5% RAC2112D310PPRO 10N 63V 1% AXIALC2122D310PPRO 10N 63V 1% AXIALC2132K510CAP MKS2 1U0 16V 10%C2

16、152D213NPPRO 1N3 63V 5% RAC2162D147WPPRO W 470P 63V 5% RAC2172D147WPPRO W 470P 63V 5% RAC2182U610ELST NON POLAR 10UF 35VC2192D110NPPRO 100P 63V 5% RAC2202D210PPRO 1N0 5% 63V RAD1003A4148SSDIODE 1N4148 75VD1013A4148SSDIODE 1N4148 75VD1023A4148SSDIODE 1N4148 75VD2003A4148SSDIODE 1N4148 75VD2013A4148SS

17、DIODE 1N4148 75VD2023A4148SSDIODE 1N4148 75VIC1005B071IC FET OPAMP TL071IC2005B071IC FET OPAMP TL071PCB1L870PB_2PRINTED CIRCUIT BOARDR1001H133RES MF W4 1% 330RR1011H110RES MF W4 1% 100RR1021H110RES MF W4 1% 100RR1041H110RES MF W4 1% 100RR1051H110RES MF W4 1% 100RR1061H110RES MF W4 1% 100RR1081H347RE

18、S MF W4 1% 47KR1091H312RES MF W4 1% 12KR1101H312RES MF W4 1% 12KR1111H356RES MF W4 1% 56KR1121H410RES MF W4 1% 100KR1131H410RES MF W4 1% 100KR1141H410RES MF W4 1% 100KR1151H315RES MF W4 1% 15KR1161H522RES MF W4 1% 2M2L870 Phono Board Parts List Issue 2.0Designator Part DescriptionR1171H522RES MF W4

19、1% 2M2R1181H022RES MF W4 1% 22RR1191H022RES MF W4 1% 22RR1201H022RES MF W4 1% 22RR1211H022RES MF W4 1% 22RR1221H339RES MF W4 1% 39KR1231H010RES MF W4 1% 10RR1241H256RES MF W4 1% 5K6R2001H133RES MF W4 1% 330RR2011H110RES MF W4 1% 100RR2021H110RES MF W4 1% 100RR2041H110RES MF W4 1% 100RR2051H110RES MF

20、 W4 1% 100RR2061H110RES MF W4 1% 100RR2081H347RES MF W4 1% 47KR2091H312RES MF W4 1% 12KR2101H312RES MF W4 1% 12KR2111H356RES MF W4 1% 56KR2121H410RES MF W4 1% 100KR2131H410RES MF W4 1% 100KR2141H410RES MF W4 1% 100KR2151H315RES MF W4 1% 15KR2161H522RES MF W4 1% 2M2R2171H522RES MF W4 1% 2M2R2181H022R

21、ES MF W4 1% 22RR2191H022RES MF W4 1% 22RR2201H022RES MF W4 1% 22RR2211H022RES MF W4 1% 22RR2221H339RES MF W4 1% 39KR2231H010RES MF W4 1% 10RR2241H256RES MF W4 1% 5K6SK18D230PHONO SKT 2-WAY HOR EMC GOLDSK28K24088-WAY AMP CT CONNSW100A1013SW PUSH 4PCOTR1004A556TRANS LF SS P BC556BTR1014A556TRANS LF SS

22、 P BC556BTR1024A556TRANS LF SS P BC556BTR1034A556TRANS LF SS P BC556BTR1044A556TRANS LF SS P BC556BTR1054A556TRANS LF SS P BC556BTR1064A1085TRANS LF SS P 2SA1085TR1074A1085TRANS LF SS P 2SA1085TR1084A546TRANS LF SS N BC546BTR1094A546TRANS LF SS N BC546BTR1104A546TRANS LF SS N BC546BTR1114A546TRANS L

23、F SS N BC546BTR1124A546TRANS LF SS N BC546BTR1134A546TRANS LF SS N BC546BTR1144A546TRANS LF SS N BC546BTR2004A556TRANS LF SS P BC556BTR2014A556TRANS LF SS P BC556BTR2024A556TRANS LF SS P BC556BTR2034A556TRANS LF SS P BC556BTR2044A556TRANS LF SS P BC556BTR2054A556TRANS LF SS P BC556BTR2064A1085TRANS

24、LF SS P 2SA1085TR2074A1085TRANS LF SS P 2SA1085TR2084A546TRANS LF SS N BC546BTR2094A546TRANS LF SS N BC546BTR2104A546TRANS LF SS N BC546BTR2114A546TRANS LF SS N BC546BTR2124A546TRANS LF SS N BC546BTR2134A546TRANS LF SS N BC546BTR2144A546TRANS LF SS N BC546B12345678ABCD87654321DCBAISSUEDRAWING NO.234

25、25DRAWING TITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA01_1070 l870 A85 PHONO ISSUE2L870_2.0.ddb - L870c1_2.0.PRJA & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PBA85 PHONO STAGE - TOP LEVELCircuit DiagramL870C1JBR23-Apr-2001INITIALSDate

26、 Printed13SheetofNotes:1EMCSK1PHONO2HG0V_SIG0V_SIGLEFT INLEFT OUTLEFT CHANNELL870C2_2.0.SCHRIGHT INRIGHT OUTRIGHT CHANNELL870C3_2.0.SCH12345678SK2AMPCT8+15V-15V0V_HF0V_SIGQ_1Q_2Q_3Q_4Q_5Q_6Q_7Q_8PCBPCB1L870PB_2Update BoxEL1UPDATE_BOXC1100N CD00_1051JAG22/3/01PRODUCTION ISSUE101_1070JAG17/4/01updated

27、 pcb and scm212345678ABCD87654321DCBAISSUEDRAWING NO.23425DRAWING TITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA01_1070 l870 A85 PHONO ISSUE2L870_2.0.ddb - L870C2_2.0.SCHA & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PBA85 PHONO STAGE -

28、LEFT CHANNELCircuit DiagramL870C2JBR23-Apr-2001INITIALSDate Printed23SheetofNotes:TR1062SA1085TR1072SA1085R12022R MFR12122R MFR105100R MFR10847K MFR101100R MFR102100R MF+C102100U SILMIC+C103100U SILMICR100330R MF+C10022U ELR10912K MFR11012K MFC105100N PER1172M2 MFR11156K MFR113100K MFR114100K MFTR11

29、1BC546BTR110BC546BTR114BC546BTR112BC546BTR113BC546BTR100BC556BTR101BC556BTR102BC556BTR103BC556BTR104BC556BTR105BC556BTR108BC546BTR109BC546B+15V-15VR12239K MFR112100K MFR11515K MF456SW100B4PCO101112SW100D4PCOR104100R MFC108470P PPWR12310R MFC104100N PEC107100N PER1162M2 MF32674IC100TL071CD0V_SIG0V_SI

30、GD1001N4148R11822R MFR11922R MFC106100N PE0V_SIG0V_HF0V_SIG0V_SIG0V_HFD1011N4148D1021N4148R106100R MFLEFT INLEFT OUTQ_101Q_102Q_103C109100P PPWR1245K6 MFC117470P PPWC116470P PPWC11110N PP AXC11210N PP AXC11810U NPC1131U0 PEC1151N3 PPC1104N7 PPC1011N0 PPC119100P PP00_1051JAG22/3/01PRODUCTION ISSUE1C1

31、201N0 PP01_1070JAG17/4/01updated pcb and scm212345678ABCD87654321DCBAISSUEDRAWING NO.23425DRAWING TITLEDrawn by:DATEFilenameECO No.DESCRIPTION OF CHANGEG:DATAECOECO AGENDA01_1070 l870 A85 PHONO ISSUE2L870_2.0.ddb - L870C3_2.0.SCHA & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCam

32、bridge CB5 9PBA85 PHONO STAGE - RIGHT CHANNELCircuit DiagramL870C3JBR23-Apr-2001INITIALSDate Printed33SheetofNotes:TR2062SA1085TR2072SA1085R22022R MFR22122R MFR205100R MFR20847K MFR201100R MFR202100R MF+C202100U SILMIC+C203100U SILMICC209100P PPWR200330R MF+C20022U ELR20912K MFR21012K MFC205100N PER

33、2172M2 MFR21156K MFR213100K MFR214100K MFTR211BC546BTR210BC546BTR214BC546BTR212BC546BTR213BC546BTR200BC556BTR201BC556BTR202BC556BTR203BC556BTR204BC556BTR205BC556BTR208BC546BTR209BC546B+15V-15VR22239K MFR212100K MFR21515K MF123SW100A4PCO789SW100C4PCOR204100R MFC208470P PPWR22310R MFC204100N PEC207100

34、N PER2162M2 MF32674IC200TL071CD0V_SIG0V_SIGD2001N4148R21822R MFR21922R MFC206100N PE0V_SIG0V_HF0V_SIG0V_SIG0V_HFD2011N4148D2021N4148R206100R MFRIGHT INRIGHT OUTQ_201Q_202Q_203R2245K6 MFC217470P PPWC216470P PPWC2151N3 PPC21110N PP AXC21210N PP AXC21810U NPC2131U0 PEC219100P PPC2104N7 PPC2011N0 PP00_1

35、051JAG22/3/01PRODUCTION ISSUE1C2201N0 PP01_1070JAG17/4/01updated pcb and scm2 Amplifier + PSU Board L882 Contents ! Circuit description ! Component overlay ! Parts list ! Circuit diagrams Amplifier & PSU Circuit Description Refer to L882 circuit diagrams This is the printed circuit board that provid

36、es the power supply and output stage amplifiers for the A32 integrated and P35 power amplifiers. Its function is to: ! Drive the loudspeakers ! Provide an (always on) auxiliary 5VDC supply for the micro controller and display interface ! Receive logic signals from the micro controller to turn on the

37、 main amplifier supply relay (mains) and connect either pair of speaker output sockets ! Send logic signals to the micro controller pertaining to the state of the amplifiers (short circuit protection, DC offset protection, thermal protection) ! Receive and demodulate RC5 remote style control codes v

38、ia the rear panel jack and transmit them to the micro controller ! Send a 12V trigger output via the rear panel jack for control of an auxiliary power amp when the unit is on ! Receive a 12V trigger input from the rear jack (for use in the power amp only version) ! Drive a pair of headphones via att

39、enuating resistor networks The power amplifier is a symmetrical, class B, bipolar junction transistor output, current-feedback design (of which more later) with DC-coupled signal and feedback paths, featuring an active integrating voltage servo to control DC offsets. It features instantaneous safe o

40、perating area protection in addition to sending a signal to the micro to turn off the output relays in the event of user or thermal overload. Since it is a DC-coupled design, the unit senses DC at the output and triggers the micro to turn off the loudspeaker relays in the event of excessive levels (

41、possibly due to a faulty source component or short circuit output transistor). The output stage uses Sanken specialised audio amplifier power bipolar Darlington transistors which are optimised for use with this type of topology. Consequently the unit has excellent measured performance in terms of no

42、ise, slew rate, output impedance and distortion (harmonic and intermodulated) and is essentially load invariant (to a first order the measured performance is independent of the load impedance). L882 Circuit Sheet 1 The audio input to the amplifier is connected to SK102 (which connects to the output

43、of the preamp PCB). This signal is passed on via SK104A which forms the preamp out connection to the outside world. SK104B provides the power amp input connection, with switchSW100 selecting between pre / power and integrated modes. The unit is wired as a preamp / power amp combination with the swit

44、ch depressed, allowing the user to insert a processor or other function (e.g. graphic EQ) between the output of the preamp and the input of the power amp. With the switch in the out position the power amp input socket is ignored and the input to the power amp is connected internally to the output of

45、 the preamp. PL100 and PL101 are handbag links fitted to the power amp only version to connect both pairs of phono sockets in parallel for daisy chaining (as there is no preamp output on a power amp). Relays RLY100 and RLY101 switch the two pairs of loudspeaker output sockets and are controlled by t

46、he micro lines describes above. Transistors TR100 and TR101 operate in constant current sink mode which allow relay current to be approximately constant although the main power supply rails will vary with mains input and load conditions. The current is around 20mA per relay. Star point SP100 is the

47、ground mecca for the entire amplifier (comprising all three PCBs within the unit). All of the separately named grounds are joined explicitly at this point. Different named grounds are used to ensure that no two different grounds share copper, which could compromise the noise, distortion or crosstalk

48、 performance of the amplifier. The loudspeaker output signals are passed to socket SK106 which connects to SK107 and onto the headphone output via the attenuation resistors R103 thru R106. The hierarchy containing the other sheets is self explanatory. Each of the port names shown on the top sheet co

49、nnects to the port of the same name on the lower sheets. L882 Circuit Sheet 2 This sheet contains the power supplies, the rear panel jack socket trigger circuits, the standby relay control and the interfacecircuits between the output signals of the power amplifiers and the inputs expected by the mic

50、ro processor. The mains input enters the unit at SK203, with capacitors C205 and C206 acting as conducted RF suppression. The earth connection is passed on to the chassis (for safety reasons the chassis metalwork remains connected to mains power earth at all times). Switch SW200 is the voltage selec