NAD-T753Phase2-avr-sm 维修电路原理图.pdf

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1、NADSERVICE MANUALT 753T 753 Surround Sound Receiver(Surround Sound ReceiverDRAFT DATE: 9 MAR 2006 PHASE IIRadioFans.CN 收音机爱 好者资料库2SAFETY INFORMATIONAH VERSIONC VERSIONRadioFans.CN 收音机爱 好者资料库3SERVICE SAFETY PRECAUTIONS1. Replacing the fusesCAUTION:FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REP

2、LACE ONLY WITH SAME TYPE OFFUSE.Reference DesignatorDatabase Part NumberDescriptionF751*AH,AHT370-019100-00(2)FUSE TIME-LAG 10A/250VAC 5X20mmUL/CSA 5TF751*C,CT370-015100-03(3)FUSE 800mA 250V TIME LAG LBC5x20mm 5T UL/CSA/VDE/SEMKOF752*AH,AHT370-011100-06(4)FUSE 1.6A 250V TIME LAG LBC5x20mm 5T UL/CSA/

3、VDE/SEMKOF752*C,CT370-018100-05(2)FUSE TIME-LAG 6.3A/250VAC5X20mm VDE/UL/CSA 5TNOTE: USA, CANADIAN MODEL ONLY.: EUROPEAN MODEL ONLY.2. Safety check out(Only U.S.A. model)Before returning the product to the customer, make leakage current or resistance measurements to determinethat exposed parts are a

4、cceptably insulated from supply circuit.CONTENTSDESCRIPTIONPAGESPECIFICATIONS. 4 - 5REAR PANEL / FRONT PANEL VIEW . 6DISASSEMBLY INSTRUCTIONS . 7WIRING DIAGRAM. 8 - 10BLOCK DIAGRAM.11SPECIAL FUNCTION . 12DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING . 12ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUS

5、TMENT . 13PCB LAYOUT . 14 - 29SCHEMATIC DIAGRAM . 30 - 46IC BLOCK DIAGRAM . 47 - 54EXPLODED VIEW. 55EXPLODED VIEW PARTS LIST. 56 - 58ELECTRICAL PARTS LIST . 59 - 77PACKING DIAGRAM . 78VERSION HISTORY . 79Parts marked with the symbol are critical with regard to the risk of fire and electricshock.Repl

6、ace only with parts recommended by the manufacturer.4SPECIFICATIONSPOWER AMPLIFIER SECTIONRated distortion (Rated power level into 8 ohms, THD 20 Hz-20 kHz FL/C/FR) 0.1 %(Rated power level into 8 ohms, THD 20 Hz-20 kHz SL/SR/BS) 0.1 %Input Sensitivity (ref. 8 ohms, 1 kHz)127 20 mVS/N Ratio(A-wtd, 1k

7、Hz, 1 W, 8 ohm, SL/SR/BL) - 72 dBFrequency Response(20 Hz - 20 kHz)0 1.0 dBChannel Balance(1 dB to -40 dB, 1 kHz) 2 dB(-41 dB to -50 dB, 1 kHz) 3 dBAudio muting at 1 kHz 55 dBSubwoofer out, 500 mV in(THD at 2 V O/P, 100 Hz) 0.5 %Crosstalk(500 mV input, 10 W, 1 kHz) -57 dBControlsBass(at 500 mV in, 1

8、 W out, 100 Hz) 10 dB 2 dBTreble(at 500 mV in, 1 W out, 10 kHz) 10 dB 2 dBDOLBY DIGITAL SECTIONChannel Difference(FL ref. Track 30) 1.2 dBFrequency Resporse at Dolby config.2SL Track 46 200 - 20 kHz 0.8 dBSR Track 47 200 - 20 kHz 0.8 dBC Track 44 200 - 20 kHz 0.8 dBHarmonic Distortion (1 W, Audio LP

9、F, Dolby Congfig 1)FL Track 65 997 Hz 0.08 %FR Track 67 997 Hz 0.08 %SL Track 68 997 Hz 0.08 %SR Track 69 997 Hz 0.08 %C Track 66 997 Hz 0.08 %S/N Ratio (31 for O/P 1 W, Track 35)CCIR / ARM 65 dBAudio LPF 70 dBA-wtd 70 dBChannel Separation (1 W, 20 kHz LPF)Track 65 997 Hz 60 dBDOLBY PRO LOGIC II SEC

10、TIONFrequency ResporseI/P mode : L, R: 1 V in, 1 W, Ch L/R40 Hz0 2.0 dB20 Hz0 2.0 dBI/P mode : L=R: 1 V in, 1 W, Ch /L/R40 Hz0 2.0 dB Ch C20 kHz0 2.0 dBI/P mode : L=-R: 1 V in, 1 W, Ch SL/SR40 Hz0 2.0 dB20 kHz0 2.0 dBS/N Ratio (200 mV in, 1 W, A-WTD w/ 1 k termination)I/P mode : L, R: 1 kHz, Ch L/R

11、65 dBI/P mode : L=R: 1 kHz, Ch C 65 dBI/P mode : L=-R: 1 kHz, Ch SL/SR 65 dBTHD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) 0.2 %5DTS SECTIONOutput Level (Vol 0 dB): FL/FR/C/SL/SR Track 61 kHz0.3 1.3 WChannel Difference (FL ref): FL/FR/C/SL/SR Track 61 kHz 1.0 dBHarmonic Distortion (Audio Filter) : FL/FR/

12、C/SL/SRTrack 10-14 1 kHz 0.08 %Frequency Response (20 Hz to 20 kHz)Track 26-30+2/-1.5Subwoofer Output Level1 kHz ref at pre-out (FL)Play Track 10, charge to 1512.5 1.5 dBAM TUNER SECTIONInput level is expressed as the reading in open circuitof 75-ohm source impedance signal generatorUsable sensitivi

13、ty(999/1000 kHz) 30 dB VS/N Ratio(5 mV in) 38 dBTHD(5 mV in) 3 %IF Rejection(450 kHz) 36 dBImage Rejection(F+2xIF) 28 dBSelectivity 17 dBOutput170 -20/+30 mVLoop sensitivity(20 dB S/N)999/1000 kHz 66 dB603/600 kHz 66 dB1404/1400 kHz 66 dBFrequency Response(100 - 2.3 kHz, 5 mV) 6 dBFM TUNER SECTION*C

14、*AHInput level is expressed as the reading in open circuitof 75-ohm source impedance signal generatorUsable sensitivity(98 MHz) 15 dB 15 dB vS/N Ratio(60 dB, IHF wtd)Mono 63 dB 63 dBStereo 63 dB 63 dBFrequency Response(20 Hz - 15 kHz, 60 dB )0 1.5 dB0 1.5 dBChannel Separation(60 dB )100 Hz 30 dB 30

15、dB1 k 38 dB 38 dB10 kHz 30 dB 30 dBAlternate Channel Selectivity (40 dB , 400 kHz) 60 dB 45 dBCapture Ratio(40 dB ) 3 dB 3 dBAM Suppression (60 dB , 100% Mod. FM, 30% Mod. AM) 48 dB 48 dBImage Rejection(119.4 MHz) 65 dBI.F. Rejection(10.7 MHz) 78 dB Pilot Suppression(98 MHz) 60 dB 60 dBTHD (60 dB, L

16、=R 75 kHz for AH, 40 kHz Dev for C) Mono 0.25 % 0.25 %Stereo 0.35 % 0.35 %Auto-Search SensitivityOn 24 dB 24 dB Off 15 dB 15 dB RDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONSDimensions (Width x Height x Depth)435 x 170 x 423 mmNet Weight20.50 Kg (45.10 lbs)Shipping Weight24.0 Kg (52.80 lbs)612

17、3456789211020111912131415161718FRONT PANELREAR PANEL / FRONT PANEL VIEWREAR PANEL1.FM & AM ANTENNA2.SOFT CLIPPING ON/OFF3.MONITOR OUT4.CD INPUT5.IR INPUT & OUTPUT6.+12V TRIGGER INPUT & OUTPUT7.COMPONENT VIDEO IN &COMPONENT VIDEO OUT8.DIGITAL AUDIO INPUT &DIGITAL AUDIO OUTPUT9.POWER SWITCH10.SWITCHED

18、 AC OUTLETS11.AC POWER INLET12.SPEAKERS A & B13.DVD, SAT, VCR, VIDEO 4 & VIDEO 514.MAIN IN / AUDIO PRE-OUTS /SUBWOOFER OUT15.TAPE INPUT & OUTPUT16.MS OUT (MULTISOURCE OUT)17.7.1 CH. INPUTS1.STANDBY SWITCH2.STANDBY LED3.AM / FM4.FM MUTE / MODE5.DISPLAY6.MEMORY7.PRESET DOWN / UP8.SEARCH DOWN / UP9.VFL

19、 DISPLAY10.VOLUME (SETUP)11.SOURCE DOWN / UP12.SURROUND MODE13.LEVELS14.TONE DEFEAT15.TONE CONTROLS16.SPEAKERS A & B17.VIDEO 6 INPUT18.PHONES7DISASSEMBLY INSTRUCTIONS1.Remove machine screws M4.0 x 8.0 (1 to 6) from the side panels.Remove tapping screw 3.0 x 8.0 (7 to 10) from the back panel.Refer to

20、 Figure No. 1.2.Pull both sides of the TOP COVER slightly outwards 11 and tilt approx. 35 and thenremove in the direction as indicated by the arrow 12. Refer to Figure No. 2.Figure No. 1Figure No. 28WIRING DIAGRAMKEYBOARDMAIN BOARDTRIGGER BOARDPOWER SWITCHBOARDJ8101BJ713AJ714AJ715AJ719AJ720AJ717AJ71

21、0AJ711AJ712AJ707AJ704AJ502BJ709AJ713BJ714BJ203AJ204BJ901BJ753BVIDEO 6 INPUT BOARDJ758BJ757BJ709BDSP BOARDJ604BJ715BJ1009BJ1010BLED BOARDPSU BOARDCOMPONENT VIDEO DIGITAL BOARD AUDIO BOARDVIDEO BOARDSPEAKER A SPEAKER B J1009AJ1010ARS232 BOARDTUNERPRE-OUT BOARDMULTI-CHANNEL J717BJ611AJ612AJ6101BJ6101AJ

22、719BJ6104AJ708BJ707BJ350AJ414BJ710BJ711BJ712BJ414ASECONDARY BOARDISC BOARDJ801AJ781AJ782AJ582AJ801BJ783A1J511BJ704BJ3103AS-VIDEO BOARDAMP 2 BOARD(SURROUND AMP.)AMP 1 BOARD(FRONT & CENTER)J612BJ502AJ503AM506J511AJ581AJ781BJ503BJ611BJ801AJ901AJ753AJ754BJ751BJ504AJ501AJ757J756J761_NJ761_LJ760J758J759J2

23、03BJ803AJ3103BJ6102BJ6103BJ6102AJ6103AJ201J204AJ6106AJ6105AJ350BJ6106AJ6105AJ8101AJ784AJ803BJ504B1J504B3J582A1J582A3J582A5J501B1J501B3J501B5J582A1J582A3J582A5J701J782A1J782A2J782A3P4402J581BTHERM SENSNORTHERM SENSNORTO MAIN BOARDTO MAIN BOARDTO MAIN BOARDTO MAIN BOARDTO MAIN BOARD82-0426135-01-XXCAB

24、LE ASSY 4 WAYS #26 FROM TRANSFORMERUL VERSION : USE J758, J759CE VERSION : USE J760MOUNT ONCHASSIS GND3334353632373839311530292827262524231920171614131211108921765432118229WIRING DIAGRAM PARTS LISTItemDatabase Part NumberDescriptionRemark1276-022613-06CABLE ASSY 2 WAYS AWG=26 2.5P UL2468AMP1 BD-L=44

25、0mmJ511A2276-041823-11CABLE ASSY 4 WAYS AWG=18 3.96P UL1007AMP1 BD-L=420mm YB03053103-03AJ581A3276-062613-22CABLE ASSY 6 WAYS AWG=26 2.5P UL1007AMP1 BD-L=320mm (RoHS)J503A4276-041823-02CABLE ASSY 4 WAYS AWG=18 3.96P UL1007AMP2 BD-L=200mm REV.B (RoHS)J781B5276-042613-08CABLE ASSY 4 WAYS AWG26 2.5P UL

26、1533AUDIO BD-L=450MM (ROHS)J3103A6276-022613-07CABLE ASSY 2 WAYS AWG=26 2.5P UL1533DIGIT BD-L=540mm (ROHS)J1009A7276-042613-06CABLE ASSY 4 WAYS AWG=26 2.5P UL2468DIGITAL BD-L=540mmJ1010A8276-011843-01CABLE ASSY 1 WAY AWG18 UL1007 BLACKKEYBOARD-L=100mm W/ RING TERMINAL (RoHS)J2019276-052613-08CABLE A

27、SSY 5 WAYS AWG26 2.5P UL1007LED BD-L=160mm (RoHS)J204A10276-011843-03CABLE ASSY 1 WAY AWG=18 UL1007 BLACKMAIN BD-L=360mm W/ RING TERMINALJ70111276-032613-18CABLE ASSY 3 WAYS AWG=26 2.5P L=110mmMAIN BD-J6106B12276-032613-19CABLE ASSY 3 WAYS AWG=26 2.5P L=60mmMAIN BD-J6105B13276-032613-29CABLE ASSY 3

28、WAYS AWG26X2C UL2547MAIN BD-L=210mm (UL LABEL) (RoHS)J715A14276-082613-22CABLE ASSY 8 WAYS AWG=26X3CMAIN BD-L=480mm (RoHS)J709A15276-102613-14CABLE ASSY 10 WAYS AWG26 2.5P UL1007MA BD-L=460mm (UL LABEL)J350B16276-122613-16CABLE ASSY 12 WAYS AWG26 2.5P UL2468MA BD-L=230mm (UL LABEL) (RoHS)J502B17276-

29、142613-02CABLE ASSY 14 WAYS #26 2.5P UL1007MA BD-L=540mm (RoHS)J8101B18276-031823-09CABLE ASSY 3 WAYS AWG=18 3.96P UL1015SPK BD-L=320mmJ782B1,J782B2,J782B319276-031823-11CABLE ASSY 3 WAYS AWG=18 3.96P UL1015SPK BD-L=350mmJ582B1,J582B2,J582B320276-051823-07CABLE ASSY 5 WAYS AWG=18 3.96P UL1007SPK BD-

30、L=250mm (V/BL/Y)J801B1,J801B3,J801B521276-051823-09CABLE ASSY 5 WAYS AWG=18 3.96P UL1007SPK BD-L=120mm (BR/R/O)J501B1,J501B3,J501B522276-031823-16CABLE ASSY 3 WAYS AWG=18 3.96P UL1015SPK BD-L=240mm REV.CJ504B1,J504B323276-062613-05CABEL ASSY 6 WAYS AWG=26 2.5PPO BD-UL1533X1C L=350mm (RoHS)J612A24276

31、-062613-09CABLE ASSY 6 WAYS AWG=26 2.5PPO BD-UL 1533X1C L=540mm REV.BJ611A10ItemDatabase Part NumberDescriptionRemark25276-011643-29CABLE ASSY 1 WAY AWG=16 UL1672PS BD-BROWN L=100mmJ75726276-011643-69CABLE ASSY 1 WAY AWG=16 UL1672 BLUEPS BD-L=100mmJ75627276-042613-07CABLE ASSY 4 WAYS AWG26 2.5P UL24

32、68PS BD-L=400mm (ROHS)J753A28276-021823-01CABLE ASSY 2 WAYS AWG=18 UL1007SE BD-L=170MM D08033504AJ803A29276-061823-09CABLE ASSY 6 WAYS #18 3.96P UL1007SE BD-L=150MM (RoHS)J801A30276-082613-20CABLE ASSY 8 WAYS AWG=26 2.5P UL1007SV BD-L=380mm (RoHS)J414A31276-011843-01CABLE ASSY 1 WAY AWG18 UL1007 BLA

33、CKV6 BD-L=100mm W/ RING TERMINAL (RoHS)P440232238-030070-20FFC CABLE 30 PINS P1.25 L=70mmJ601CW/SHIELD33238-172820-03FFC CABLE 17 PINS P1.25 L=200mmJ720CW/SHIELD34238-200016-00FFC CABLE 20 PINS P1.25 L=160mmJ604CW/SHIELD35238-280017-00FFC CABLE 28 PINS P1.25 L=170mmJ602C,J603CW/SHIELD36238-300222-00

34、FFC CABLE 30 PINS P1.25 L=220mmJ713C,J714CW/SHIELD37276-011643-23CABLE ASSY 1 WAY AWG=16 UL 10151-CHASSISGREEN/YELLOW L=100mm (RoHS)GND38276-011643-29CABLE ASSY 1 WAY AWG=16 UL16721-INLET/BROWN L=100mmPSU.BD (L),J75939276-011643-69CABLE ASSY 1 WAY AWG=16 UL1672 BLUE1-INLET/L=100mmPSU.BD,J75811BLOCK

35、DIAGRAM12SPECIAL FUNCTIONFEATUREKEYS PRESS ON FRONT PANELRESET FOR AH VERSIONVIDEO 6 +SOURCE UPRESET FOR C VERSIONVIDEO 6 + SOURCE DOWNNTSC / PAL SELECTIONVIDEO + MEMORYVFD ALL DISPLAYAUDIO 6 + TONE DEFEATAM FREQ. STEPAM/FM + FM MUTEDETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGINGM6759(U202) main cloc

36、k is at 20MHz(X202)M6759(U201) main clock is at 20MHz(X201)UPPER - +5V supply to KEYBOARD when power upLOWER - RESET line (TCM810LENB713) whenpower upUPPER - OUTPUT ENABLE(pin 24) of EPROM(W27C02) when changing SURROUND MODESLOWER - CHIP ENABLE(pin 22) of EPROM(W27C02) when changing SURROUND MODESSC

37、LK (pin 43 of CS49326)LRCLK (pin 42 of CS49326)MCLK (pin30 of CS49326)NOTE: The waveforms are based on software version V2.10.13AMPLIFIER ADJUSTMENTIdle Current1.Rotate R522 fully clockwise.2.Connect DC millivoltmeter to P501 (i.e. Across half of R523, 0.22 Ohm resistor).3.Turn on the unit.4.Adjust

38、R522 for 1mV reading on voltmeter.5.Leave power on for at least 5 min, and check for idle current again.6.Repeat for other channels.CHANNELJUMPERVRFLP501R522FRP502R545CP503R571SLP801R835SRP802R836BSP803R897ISC Sensitivity1.Connect 8 ohm loading to all channels.2.Rotate R881 fully clockwise.3.Load al

39、l channels at full power using 1kHz sine wave.4.At this time, monitor the THD of the SL,SR,BS output. Clipping should occur before full powerachieved.5.Rotate R834 counter-clockwise slowly until the THD just below 0.1%.6.Repeat step 2-5 for R834 but monitor FL, FR & Center output.7.The procedure is

40、finish at this step.8.Load all channels at full power using 1kHz sine wave with 4 ohm load.9.The clipping power(at THD 0.1%) should less than 85W.ADJUSTMENT POINT DIAGRAMR522R545R571P501P502P503P803P802P801R835R836R897R881FRONT / CENTER AMPLIFIER BOARDSURROUND AMPLIFIER BOARDSECONDARY / ISC BOARD14P

41、CB LAYOUTAUDIO BOARDPOWER SUPPLY (STANDBY) BOARD15COMPONENT VIDEO BOARD - COMPONENT SIDECOMPONENT VIDEO BOARD - COPPER SIDEDIGITAL BOARD - COMPONENT SIDE SIDEDIGITAL BOARD - COPPER SIDE16DSP BOARD - COPPER SIDEDSP BOARD - COMPONENT SIDE17FRONT / CENTER AMPLIFIER BOARD - COMPONENT SIDE18FRONT / CENTE

42、R AMPLIFIER BOARD - COPPER SIDE19SURROUND AMPLIFIER BOARD - COMPONENT SIDE20SURROUND AMPLIFIER BOARD - COPPER SIDE21KEY BOARD/POWER SWITCH- COMPONENT SIDEKEY BOARD/POWER SWITCH- COPPER SIDE22MAIN BOARD23MULTI-CHANNEL BOARD - COMPONENT SIDE24MULTI-CHANNEL BOARD - COPPER SIDE25PRE-OUT BOARD - COPPER S

43、IDEPRE-OUT BOARD - COMPONENT SIDE26SPEAKER TERMINAL BOARDPOWER SWITCH / TRIGGER BOARDVIDEO 6 BOARD27SECONDARY / ISC BOARD - COMPONENT SIDESECONDARY / ISC BOARD - COPPER SIDE28S-VIDEO BOARD29COMPOSITE VIDEO BOARD - COMPONENT SIDECOMPOSITE VIDEO BOARD - COPPER SIDE30SCHEMATIC DIAGRAMAUDIO SWITCHRESIST

44、ORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.31COMPONENT VIDEORESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE

45、1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.32COMPOSITE VIDEORESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.33E C B2SA10152SC1815E

46、C B2SA1016POWER SUPPLY (SECONDARY)NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. COMPONENTS MARKED ARE SAFETY CRITIAL PARTS.34POWER SUPPLY (STAND BY)RESISTORS : F-FUSIBLE, UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. COMPON

47、ENTS MARKED ARE SAFETY CRITIAL PARTS.35TRIGGERRESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.36VIDEO 6RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1.

48、 RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.37SPEAKER A & B38PREOUTE C BRN1241DTA114ESAE C BNOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.39D

49、IGITAL INPUT / OUTPUTNOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.40E C B2SA933E C B2SC1740E C B2SC18152SC2878DTC144ESADTC123ESAE C BS-VIDEORESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.NOTE:1. RESISTORS, UNL

50、ESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.41E C B2SA10162SC2362B C E2SA16062SC4159B C E2SA20312SC5669E C B2SD600K2SD631KDTC123ESAE C BFRONT / CENTER CHANNEL POWER AMPLIFIERNOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.2. A