Onkyo-TXSR302-avr-sm 电路图 维修手册.pdf

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1、TX-SR302 SERVICE MANUALSERVICE MANUAL AV RECEIVER Silver model MODEL TX-SR302 120V AC, 60HzMDD, UDD Ref. No. 3844 112004 RC-479S SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK ON THE SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE TH

2、ESE COMPONENTS WITH ONKYO PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL. MAKE LEAKAGE-CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER. RadioFans.CN 收音机爱 好者资料库 TX-SR302 SPECIFI

3、CATION Amplifier SectionGeneral Video Section Tuner Section Specifications and features are subject to change without notice. AM Tuning Frequency Range: 530 kHz1710 kHz Usable Sensitivity: 30 V S/N Ratio: 40 dB THD: 0.70 % Audio Outputs Analog Outputs: TAPE, VIDEO 1 Subwoofer Pre Outputs: 1 Speaker

4、Outputs: 5 + 2 Phones: 1 Audio Inputs Digital Inputs: 1 (Optical), 1 (Coaxial) Analog Inputs: DVD (MULTICHANNEL), CD, TAPE, VIDEO 1, VIDEO 2, VIDEO 3 Multichannel Inputs: 6 Video Outputs A/V Output: MONITOR, VIDEO 1 Video Inputs A/V Input: DVD, VIDEO 1, VIDEO 2, VIDEO 3 Power Output Front L/R: 65 W

5、+ 65 W Center: 65 W Surround L/R: 65 W + 65 W (8 , 20 Hz20 kHz, FTC) Dynamic Power: 160 W + 160 W (3 , Front) 125 W + 125 W ( 4 , Front) 85 W + 85 W (8 , Front) THD (Total Harmonic Distortion): 0.08 % (Power Rated) Damping Factor: 60 (Front, 1 kHz, 8 ) Input Sensitivity and Impedance: 200 mV/ 47 k (

6、LINE) Output Level and Impedance: 200 mV/ 470 (REC OUT) Frequency Response: 10 Hz100 kHz/ +1 dB, -3 dB (Direct mode) Tone Control: +12 dB, -12 dB, 50 Hz (BASS) +12 dB, -12 dB, 20 kHz (TREBLE) SN Ratio: 100 dB (LINE, IHF-A) Speaker Impedance: 8 16 Power Supply: AC 120 V, 60 Hz Power Consumption: 4.2

7、A Stand-by Power Consumption: 1.6 W Dimensions (W x H x D): 435 x 150 x 365 x mm 17 1/8 x 5 7/8 x 14 3/8 inches Weight: 8.4 kg 18.5 lbs Input Sensitivity/Output Level and Impedance: 1 Vp-p /75 (Composite) FM Tuning Frequency Range: 87.5 MHz108.0 MHz Usable Sensitivity: Stereo 17.2 dBf 2 V (75 IHF) M

8、ono 11.2 dBf 1 V (75 IHF) S/N Ratio: Stereo 70 dB (IHF-A) Mono 76 dB (IHF-A) THD: Stereo 0.3 % (1 kHz) Mono 0.2 % (1 kHz) Frequency Response : 30 Hz 15 kHz / +1 dB, -1 dB Stereo Separation: 45 dB (1 kHz ) RadioFans.CN 收音机爱 好者资料库 SERVICE PROCEDURES TX-SR302 1. Replacing the fuses 2. Safety-check out

9、After correcting the original service problem perform the following safety check before releasing the set to the customer Connect the insulating-resistance tester between the plug of power supply cord and terminal GND on the back panel. Specifications: More than 10Mohm at 500V This symbol located ne

10、ar the fuse indicates that the fuse used is show operating type, For continued protection against fire hazard, replace with same type fuse, For fuse rating, refer to the marking adjacent to the symbol. Ce symbole indique que le fusible utilise est e lent. Pour une protection permanente, nutiliser qu

11、e des fusibles de meme type. Ce demier est indique la qu le present symbol est apposre. 3. To initialize the unit This unit does not require memory preservation batteries. A built-in memory power backup system preserves the contents of memory during power failures and even when the power cord is unp

12、lugged. The power cord must be plugged in order to charge the backup system. The memory preservation period after the unit has been turned off varies depending on climate and placement of the unit. On average, memory contents are protected over a period of a few weeks after the time the unit has bee

13、n turned off. This period is shorter when the unit is exposed to a very humid climate. This device employs a microprocessor to perform various functions and operations. If interference generated by an external power supply, radio wave, or other electrical sauce results in accident which causes the s

14、pecified operations and functions to operate abnormally. To perform a result, please follow the procedure below. 1. Press and the hold down the VIDEO 1 button , then press the STANDBY/ON button when the unit is Power ON. 2. After Clear is displayed, the preset memory and each mode stored in the memo

15、ry, are initialized and will return to the factory settings. 5. Memory Preservation Main microprocessor Q7008 1. Press and the hold down the DISPLAY button , then press the STANDBY/ON button when the unit is Power ON. Version is displayed on FL display only for 3 seconds. 2. Press the STANDBY/ON but

16、ton to Power Off. 4. How to check version of microprocessor? Version 04212a ex. REF. NO. F6901 F6901 or F6902 F6902 or F901 F901 or F903 F903 or DESCRIPTION 8A-UL 8A-T/UL-ST2 8A-UL 8A-T/UL-ST2 6.3A-UL/T-237 6.3A-T/UL-ST2 5A-UL/T-237 5A-T/UL-ST2 PART NO. 252198 252261 252198 252261 252166 252260 2521

17、64 252258 REMARKS ! ! ! ! ! ! ! ! RadioFans.CN 收音机爱 好者资料库 OPERATION CHECK-1 DC VOLTAGE DETECTION PROTECTORS CURRENT DETECTION PROTECTORS TX-SR302 Test - _ Test - 1-00 FL display Clear Disappears 0.5 sec. FL display Test - _ Test - 4-00 Test - 4-29 Clear Disappears 1. Set the unit to test mode Test-1

18、-00 . 1-1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON. 1-2. Press the DVD button, while the Test - _ is shown. Unit will be in the state of Test-1-00 . 2. Apply DC voltage (+1.5 to +3V) to MULTI CHANNEL (FL, FR, SL, SR, C) terminal, each channe

19、l. 3. Check that Protect is shown. 4. Apply DC voltage (-1.5 to -3V) to MULTI CHANNEL (FL, FR, SL, SR, C) terminal, each channel. 5. Check that Protect is shown. 6. Press the STANDBY/ON button. NOTE1 Limit time to apply voltage is 0.5 to 1.0 seconds each channel. When protection operation does not o

20、ccur at once, try several times. NOTE2 Dont connect speakers or any load. Dont short speaker terminals. NOTE In the state of test mode Test-4-29 , the pulse waveform output for checking from speaker terminal automatically. Therefore, oscillator is unnecessary. 1. Set the unit to test mode Test-4-29

21、1-1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON. 1-2. Press the VIDEO 3 button, while the Test - _ is shown. Unit will be in the state of Test-4-00 . 1-3. Repeat and press SPEAKERS B button to the Test-4-29 is shown. 2. Connect the lord resiste

22、r (3 ohms) to the speaker terminals. 3. Check that the Protect is not shown, and speaker relays not turn OFF. 4. Check the each speaker terminals. 5. Connect the lord resister (1.5 ohms) to the speaker terminals. 6. Check that the Protect is shown, and speaker relays turn OFF immediately. 7. Check t

23、he each speaker terminals. 8. Press the STANDBY/ON button. OPERATION CHECK-2 OUTPUT LEVEL & THERMAL DETECTION TX-SR302 RL6901 D6904 D6903 RL6902 POWER AMP. PRI.SEC1 Low High +B1 -B1 T901 MAIN TRANSFORMER Low High Q6303 THERMAL SENSOR R6380 THERMAL DETECTION OUTPUT LEVEL DETECTION VOLH/ THPRO Q7008 M

24、AIN MICROPROCESSOR Q6303 SEC1H 23 2 SPEAKER OUT F6901 F6902 Low-voltage HIGH VOLTAGE MODE LOW VOLTAGE MODE +/- 49 V +/- 28.9 V High-voltage Regarding the power supply system of this unit. 1. High-voltage mode Usually, the power supply supplies high voltage to the power amplifier circuit when the rel

25、ay (RL6901) is turned On. 2. Low-voltage mode When as follows, a power supply changes to the state of supplying low voltage when the relay (RL6901) in turned Off. (1) Excessive output signal is continuously outputted from power amplifier. (2) Temperature of a heat sink over 80 degrees. 1. The loss w

26、hich power amplifier generates is decreased. As a result, the miniaturization of a heat sink is realized. 2. Corresponds to a safety standard. May not notice the fuse (F6901, F6902) broken in the case of repair. Because the power supply is continuing supplying voltage from the High side of SEC1 at h

27、igh-voltage mode. When a power supply circuit changes to low voltage mode, amplifier does not operate. Therefore, it is very important to check operation of this power supply system containing a fuse. NOTE Dont connect speakers or any load. Dont short speaker terminals. (1) Set the unit is Multi cha

28、nnel input state. (2) Set the master volume into the minimum. (3) Apply sine wave signal to MULTI CHANNEL INPUT (FL+FR+C+SL) terminals. (4) Connect an oscilloscope to speaker terminal of FL channel. (5) Adjust master volume so that a speaker output may become distortion about 5%. (6) Check that the

29、RL6901 and RL6902 are turned Off after about 5 seconds progress. And the power supply changes to low-voltage mode. (7) Adjust the master volume so that output voltage may become half. (8) Check that the RL6901 and RL6902 are turned On after 2 to 3 minutes. And the power supply returns to high-voltag

30、e mode. OPERATION CHECK-3 OUTPUT LEVEL & THERMAL DETECTION TX-SR302 P6301 COM TH1 TH2 30 U16 NAAF-8245 POWER AMPLIFIER PC BOARD P6301 TH1 COM Front side 2.7 kohms 1W Test - _ Test - 3-00 Test - 3-02 Test - 3-02 FM STEREO FM STEREO Clear Disappears 0.5 sec. Clear Disappears 0.5 sec. Test - 3-02 FM ST

31、EREO FM STEREO OUTPUT LEVEL DETECTION 1. Set the unit to test mode Test-3-2 1-1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power On. 1-2. Press the VIDEO 2 button, while the Test - _ is shown. Unit will be in the state of Test-3-00 . 1-3. Repeat and pr

32、ess SPEAKERS B to while the Test-3-2 is shown. 2. Apply signal (sine wave 1kHz, -1.5dBV) to MULTI CHANNEL (FL, FR, SL, SR, C) terminal, each channel. 3. Check that FM STEREO indicator is shown. 4. Press the STANDBY/ON button. THERMAL DETECTION 1. Set the unit to test mode Test-3-2 Refer to the claus

33、e of Output level detection. 2. Connect the resistor (2.7 kohms, 1W) between HT1 and COM terminals of P6301. 3. Check that FM STEREO indicator is shown. 4. Press the STANDBY/ON button. The following is the procedure of checking detection operation of a microprocessor in false, by using test mode. OP

34、ERATION CHECK-4 DSP DEBUG MODE TX-SR302 DSP Debug Mode Version 04212a E1 A- - - 0 - o 2 3 o FL display Details of FL display 142568793 1 sec. TIn this test mode, the check with normal communication of a microprocessor and the data of DSP and DIR is possible. This information is a help to find the ca

35、use of failure. UNLOCK E = UNLOCK = LOCK 1 Digital Selector D = DIGITAL A = ANALOG 1 = COAX 2 = OPT1 3 = OPT2 4 = Others 2 Sampling Frequency 96 = 96kHz 48 = 48kHz 44 = 44kHz 32 = 32kHz = Not detect 3 MEMORY Address 0 = AC3+PLII 1 = AC3/PCM+T-D 2 = DTS/DTS-ES 3 = DTS 5 = AAC+PL6 : COS 7 = FACTORY TE

36、ST MODE 6 Pre Emphasis K = OFF e = ON 4 ROM/RAM Select/Download Status H = RAM (Complete Auto Boot) L = ROM (Under Auto boot) 7 DSP Detect Format IEC61937 00 = Null 01= Dolby Digital 03 = Pause 04 = MPEG1 L1 05 = MPEG1 L23/MPEG2 w/o 06 = MPEG2 w/o 07 = MPEG2 AAC 0B = DTS1 0C = DTS2 0D = DTS3 1B = MP

37、EG2 AAC1 1C = MPEG2 AAC2 Except IEC61937 20 = Silent 21 = DTS LD 22 = DTS CD 23 = PCM 8 DSP Decode 0 = Decode OK X = Decode NG - = Analog in 9 1. Press and hold down the DISPLAY button, then press the STANDBY/ON button when the unit is power ON. 2. Press the DISPLAY button, while the Version 04212a

38、is shown. Press STANDBY/ON button. DIR MEMORY/DOWNLOAD DIR Status 0 = PCM/ANALOG 2 = DTS CD 5 = DD/DTS/AAC 5 DSP TX-SR302 EXPLODED VIEWS-1 TX-SR302 U04 U03 P7502 P7503 U02 F903F6902 F6901 U18 U19 U01 U10 U25 U09 U27 P101 U23 U08 P901 U12 T901 U11 U20 U17 P800 x 8 A028 A004 A004 x 6 A050 A425 A051 x

39、6 A030 A004 A005 x 3 A005 x 10 A411 A004 A004 A004 x 2 A004 x 2 A025 A004 A404 x 24 A401 A026 A055 x 4 A010 A002 x 2 A026 x 3 A065 A413 A412 A414 A060 A061 A420 A410 A056 x 8 A004 x 4 A017 x 2 A017 A016 x 2 A015 A023 x 4 F901 Refer to in EXPLODED VIEWS-2 Refer to in EXPLODED VIEWS-2 U26 A004 TX-SR30

40、2 EXPLODED VIEWS-2 TX-SR302 Q6064 Q6063 Q6062 Q6061 Q6060 Q6050 Q6051 Q6052 Q6054 Q6053 Q6050A x10 A037 x10 A416 (L=85mm) A417 (L=160mm) FRONT PANEL INSIDE VIEW A416 (L=85mm) A415 (L=135mm) A418 (L=215mm) BLOCK DIAGRAM TX-SR302TX-SR302 SUBWOOFER PREOUT AC OUTLET BASS BOOST MUTING MUTING OUTPUT GAIN

41、0-18dB OUTPUT GAIN 0-18dB OUTPUT GAIN 0-18dB OUTPUT GAIN 0-18dB OUTPUT GAIN 0-18dB OUTPUT GAIN 0-18dB INPUT GAIN 0/6dB INPUT GAIN 0/6dB INPUT GAIN 0/6dB INPUT GAIN 0/6dB INPUT GAIN 0/6dB INPUT GAIN Q301 BD3811K 0/6dB Q302(1/2) 10.5dB Q302(2/2) Q305 15dB NC NC VIDEO 3 CD L R L R L R L R L R L R L R L

42、 R L R CENTER SUB WOOFER TAPE IN TAPE OUT VIDEO 1 OUT VIDEO 1 IN VIDEO 2 IN FRONT SURROUND DVD BACK UP Q7501 OPERATION KEY 16BT123GK FL TUBE STANDBY D7507 RL6901 INPUT ATT. -6dB MASTER VOLUME 0,-103dB 50KLPF SW 50KLPF C 50KLPF SR 50KLPF SL 50KLPF R 50KLPF L SEC2 DIR 2CH A/D 96/24 VIDEO SELECTOR MAIN

43、 MICROPROCESSOR Q7008 MPD784225GC-249-8BT SUB MICROPROCESSOR Q7502 MPD780232GC-030-8BT Q701 CS493264 DSP 96/24 6CH D/A Q801 AK4586 Q804 Q803 Q802 OPTICAL BASS/TREBLE BASS/TREBLE AC IN F901 P902 RL901 D921 -924 D9502 -9504 D6904 D6903 RL6902 POWER AMPLIFIER SECTION D9509 -9512 PRI. SEC1 T902 U7501 RE

44、MOTE SENSOR SEC3 +B1L+B1H PHONES VIDEO VIDEO2 IN VIDEO1 IN DVD IN 12.5MHZ 5MHZ 12.288MHZ VIDEO MUTE Q202 Q201 MONITOR OUT VIDEO 1 OUT SEC1H/L CONTROL Q6901 Q4606 78M05 +5VDSP Q6402 78M12 Q6403 79M12 -12VAF -12VAF VIDEO SECTION PRE-AMPLIFIER SECTION DSP IC -VP +12V Q9501 FL TUBE FLAC FLAC RELAY +B2 S

45、EC1H +B1-B1 Q6931 NJM78M56A Q6405 78M12 +5.6V MICROPROCESSOR SUB MICROPROCESSOR POWER OSC +5V -12VAF +12VAF +7V -7V +2.5V DSP IC POWER SUPPLY VOLTAGE LEVEL SENSOR R6380 THERMAL SENSOR VOLH/THPRO PRO D6703 DC VOLTAGE DETECTION & OVER CURRENT DETECTION Q67016703 COAXIAL Q281 74HCU04 VIDEO3 IN +27dB +2

46、7dB +27dB +27dB +27dB POWER AMPLIFIER L R FRONT SPEAKERS-A FRONT SPEAKERS-B SURROUND SPEAKERS CENTER SPEAKER L R L R +3.3V 78 77 2 69 68 1 55 72 666571 57 4 3 4342 38 6 5 4039 8 37 7 3031 76 35 75 3334 10 36 SWPO 9 23 21 26 25 28 27 24 22 12 18 11 AMUT 14 20 13 16 15 17 19 SPF SPCS SPB HPDET SELMUT

47、SELDA SELCL RST.CS.INTREQ/CL/DA /SCDO RST.CS/CL/DA/ CDTO/INT1.2. CTLA/B VMUT2 VMUT1 DIGITAL IN Q7004 BA33C25 Q321 78L07 Q322 79L07 Q307 MUTING Q312 Q313 Q306 Q308 D6704 RL6603 RL6601 RL6604 RL6600 Q203 LA7956 SUB TRANSFORMER T901 MAIN TRANSFORMER TUNER UNIT MAIN MICROPROCESSOR RI RI INTERFACE 120V 6

48、0Hz SELECTOR/ TONE CONTROL / VOLUME POWER SUPPLY FL FR SL SR C A 1 2 3 4 5 BCDEFGH BLOCK DIAGRAM TX-SR302TX-SR302 SUBWOOFER PREOUT AC OUTLET BASS BOOST MUTING MUTING OUTPUT GAIN 0-18dB OUTPUT GAIN 0-18dB OUTPUT GAIN 0-18dB OUTPUT GAIN 0-18dB OUTPUT GAIN 0-18dB OUTPUT GAIN 0-18dB INPUT GAIN 0/6dB INP

49、UT GAIN 0/6dB INPUT GAIN 0/6dB INPUT GAIN 0/6dB INPUT GAIN 0/6dB INPUT GAIN Q301 BD3811K 0/6dB Q302(1/2) 10.5dB Q302(2/2) Q305 15dB NC NC VIDEO 3 CD L R L R L R L R L R L R L R L R L R CENTER SUB WOOFER TAPE IN TAPE OUT VIDEO 1 OUT VIDEO 1 IN VIDEO 2 IN FRONT SURROUND DVD BACK UP Q7501 OPERATION KEY 16BT123GK FL TUBE STANDBY D7507 RL6901 INPUT ATT. -6dB MASTER VOLUME 0,-103dB 50KLPF SW 50KLPF C 50KLPF SR 50KLPF SL 50KL