Onkyo-TXDS575-avr-sb99010r1 电路图 维修手册.pdf

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1、2-1 NISSHIN-CHO,NEYAGAWA-SHI,OSAKA 572-8540,JAPAN Techinical InformationGroup,Service Dept. SERVICE BULLETIN NO:99010-r1 LAST REVISED :00/03/02 DATE : 99/09/03MODELS : TX-DS575 SUBJECT : Noise is heard from VOLUME MIN to VOLUME 1. Symptom: When MASTER VOLUME is raised from VOLUME MIN to VOLUME 1, th

2、e noise is heard from front speaker, center speaker, and rear speaker. Cause: The gain of the following circuit from master volume is higher, and the residual noise in the amplifier was larger. Procedure for service: Please improve the complaint goods without A added at the end of serial numbers as

3、follows. a. The gain of all channels is reduced. b. Noise decrease c. Distortion rate improvement Because the distortion rate worsens by reducing the gain, please do measures of item C. If the volume position is raised about 30 degrees, the noise becomes as well as before measures when measures are

4、executed. The following service improvement ideas have the effect of the improvement of about 79dB. Circuit No.BeforeAfterParts No.Remarks a. Gain reduce (NAVD-6566) R3183,R328339kohm18kohm417341834Front L/R R3184,R328447kohm10kohm417341034Front L/R R3384,R3484,R358422kohm6.8kohm417346824Center,Surr

5、ound R3683 330ohm820ohm417348214Sub-woofer b. Noise decrease (NAVD-6566) Q3180,Q3181,Q3281NJM4558LNJM4580L-D22240312Front L/R Additional C3183,C3185,C3283 C3285,C3383,C3483 C3583 27pF220pF345022214100KHz c. Distortion rate improvement R3199(NAVD-6566)100kohm220kohm417342244 R7089(NADIS-6576) (*2) 22

6、0ohm10kohm433121034R1 J231(NAVD-6566) (*1)J23110kohm417341034 NOTE : *1 and *2 are same mofdification. Please modify *1 or *2. KIT NO. : 0T0058 RadioFans.CN 收音机爱 好者资料库 2-1 NISSHIN-CHO,NEYAGAWA-SHI,OSAKA 572-8540,JAPAN Techinical InformationGroup,Service Dept. SERVICE BULLETIN NO:00005 MANAGER Akira

7、Mori GL Seiji Ichikami DESIGN Masaoki Yokochi 2000/07/052000/07/042000/05/15 MODELS : TX-DS575 SUBJECT : Change of parts 1.Microprocessor This model is used the microprocessor of 3 types. When replace the microprocessor Q7001, refer to the remarks below. ItemDescriptionPart No.Contain of changeRemar

8、ksApplication Use item 2 instead of 1.MD:1-10600 13001-14600 Refer to note below.MP:5001-6900 MD:10601-13000 14601- MP:1-5000 6901- Improvement of noise when DOLBY. 222413431MPD780208GF-045-3BA Use same IC.2MPD780208GF-047-3BA22241398Elimination of 2nd Pll circuit 22241419MPD780208GF-056-3BA3From Oc

9、t. 1999Use same IC. Note: When you change the microprocessor from 045-3BA to 047-3BA, remove 2nd PLL circuit and change the setting of A/D,D/A Converter IC Q8501. RadioFans.CN 收音机爱 好者资料库 ONKYO USA CORPORATION 200 W illiams Drive Ramsey NJ 07446 201-825-7950 Fax 201-825-8150 Title: TX-DS575 Date: 04/

10、13/03 Classification: Service Tip Ref #: TXDS575MUTE Symptom: Receiver shuts down when source, Speakers are selected or volume is set to MIN. position. Solution: Defective components Referring to Page 41 and 42 of service manual find all location of muting transistors used. Anyone of the following t

11、ransistors at location Q3383, 3483, 3186, 3187, 3188, 3684, 3683, 3583, 3283, 3183 may be leaky. In the exception of Q3187 and Q3188, the emitter voltage of the above-described components should not exhibit any DC volt presence in excess of 12mv to max 20mv while operating. Mute duration is governed

12、 by C3194. Muting control DC volt (+2.6) passes through Q3185. The base of all muting transistors is -12vdc when unit is operating normal. When in mute mode, muting transistors base voltage goes to approximate +2.6vdc. Q3184 pins 1,2,3,4,8,9,10,11 are expected to be DC free. If Any DC is noticed, Q3

13、184 may be defective. Troubleshooting Steps and Procedure: Since the unit is likely to shut down if any one of the function switches or volume controls reach MIN, do the followings to keep the unit ON. 1) On the power amplifier PCB locate P601A. Then Short all the connector pins together. 2) Locate

14、Front amplifier input connector P520A. Short all the connector pins together EXCEPT FIRST PIN, which is 24vdc carrier. This condition will allow the unit to stay ON allowing troubleshooting without unit shutting down. * Do not forget to remove or clean short when service is complete. RadioFans.CN 收音

15、机爱 好者资料库 ONKYO USA CORPORATION 200 Williams Drive Ramsey NJ 07446 201-825-7950 Fax 201-825-8150 Title: TX-DS575 Date: 11/21/99 Classification: Service Tip Ref #: TXDS575DSP Symptom: Audio cuts out or intermittent audio from either digital or analog inputs. Solution: Loose components In some units Q7

16、10 may become loose following poor solder flow in production. What may be assumed as a DSP PCB malfunction, has been found to be mainly a loose Q710, while in some cases Q708, Q709, and Q114 have also been found with one or more of their solder pins loose. This unit will not work if any of the data

17、lines, pin 8 through pin 17 of Q707, fails to reach Q710, Q709 and or Q708. *Note: Q114 input select IC crystal is only ON (working) when input is in analog mode. When digital input source is selected X103 is normally turned off. Please do not assume this as defect. Untitled Document ? ? ? ? ? ? ? ?

18、 ? ? ? ? ? ? In some units Q710 may become loose following poor solder flow in production. What may be assumed as a PCB malfunction, has been found to be mainly a loose Q710, while in some cases Q708, Q709, and Q114 have also been found with one or more of their solder pins loose. This unit will not

19、 work if any of the data lines, pin 8 through pin 17 of Q707, fails to reach Q710, Q709 and or Q708. * Title TX-DS575 Classification Service Tip Symptom Audio cuts out or intermitent audio from either digital or analog inputs. Reason Loose components Solution Page 1 When a DTS program material is be

20、ing played, it is possible the audio may at some point tend to break-up or flutter. This is not a failure in the product, when the Re-EQ setting is left in the ON position, it will affect the DTS operation. The RE-EQ setting should not be used when playing DTS material. Re-EQ must be OFF for DTS to

21、work properly. In the parameter setting of Owners Manual, DTS was included when using the RE-EQ setting effectively. That is a print error. No service is required except customer education. . DATE: 03/20/01 Classification: Mandatory Problem: Intermittent audio drop out or flutter. Model: TX-DS484, T

22、X-DS575, TX-575X, TX-DS676, TX-DS777 Ref: DTS-Re-EQ-1 ONKYO USA CORPORATION Ref# 01DS575XAM 01/27/01 AM Radio interference Classification: Service Tip In some cases, an AM radio transmitting near by the consumer house (3miles or less of radius est.) may cause audio of the modulated AM signal be hear

23、d through center and rear channels regardless of input setting. AM broadcast Frequency range 1360Khz 1510Khz. On Volume PCB NCVD-6746, add D204 with 1SS133 Part Number #223163. In place of C3686 place a jumper. Resolder any loose RCA plugs and ground connectors. For more technical questions send ema

24、il to TXDS575X Part 1Part 1 Analog ProcessingTX DS575 / TX DS575XAnalog ProcessingTX-DS575 / TX-DS575X Pin 31 and 32 balanced input for Right channel(RED); Pin 29 and 30 balanced input for Left channel (GREEN)pg()p() Q8501 have combination of ADC and DAC. Pin 29 32 are balanced inputs to ADC. Intern

25、aly the analog signal goes through High Pass Limiter before it is clocked to L/R out. ggg Master Clock MCK02 is made available from at Pin 39. Source of MCK02 is Q114. Pin 9 provides a serial audio data output derived from the analog inputs 2932 whose data rate is dependant on L/R Clock at Pin 5 and

26、 Master Clock at Pin 39. The L/R clock and Serial Data may look alike except Pin 9 has data incorpoarted within the L/R clock. Pin 9 serial data will arrive at Q114 at Pin 8. The analog signal that goes in at Pin 2932 does not Q101 services as inverting amplifier The analog signal that goes in at Pi

27、n 29 32 does not come come out as analog through Pin 2328 before it Q101 services as inverting amplifier While Q102 non inverting. Note correctioncome come out as analog through Pin 23 28 before it has a chance of being processed as above While Q102 non inverting. Note correction On PIN 5,6,. as a c

28、 a ce o be g p ocessed as abo e 66 55 66 55 Analog ProcessingTX DS575 / TX DS575XAnalog Processing Part 2 fQf Q TX-DS575 / TX-DS575X Part 2 Audio Data from Q8501 Pin 9 arrives at Pin 8 of Q114. Same data will find its way out at pin 20 of Q114. It is important X0 XI Pin 5 and Pin 6 work correct and

29、that 12 2MhzIt is important X0-XI Pin 5,and Pin 6 work correct and that 12.2Mhz oscilation is present No noticable drift or Jitter should be noticedoscilation is present. No noticable drift or Jitter should be noticed. ANALOG PROCESSING Part 3 Q114 Pin 15 = L AnalogDigital =H TX-DS575 / TX-DS575X Q1

30、14 Pin 15 L Q114 Pin 17 = H H =L It is conditional that audio data is present at Pin 8 (DAUX) of Q114 and that X-tal X103 is ON in-order for Q114 to operate properly The digital condition set forth at Pin 15 and 17 along a precence of digita datato operate properly. The digital condition set forth a

31、t Pin 15 and 17 along a precence of digita data at Pin 13, 12 and 11 will turn OFF X103. 4.6vdc Q114 waveforms when input is analog. Q114 Pin 27 when digital selected and digital signal detected.digital signal detected. MCK01,MCK02 at Q114 Pin 24 & 23 MCK01, MCK02 after L171 &L170 Pin 19 LRCK Pin 26

32、 digital source selected. Absent when analog. LRCK g TXDS575 Compiled on 05/24/2000 This is a part of more technical information to follow. To help troubleshoot this model for audio related problem the following easy to follow method has been adapted. Problem: Audio Analog via any source goes in and

33、 no audio out. Unit is not in protection mode. 1. Assuming that you have signal present at the CD input, we will chase the signal as follows. When we do, we will consider all supply voltages are up and up. No ripple voltage is seen over the DC supply line. 2. Remove the DSP PCB and set it flat with

34、the component side accessible. Check for signal at pin 2 and 6, of Q101 and Q102. Please note that the pin label of Q101 and Q102 is incorrect. Pin 1 and 7 are output of those same ICs. 3. Balanced output of Q101 and Q102 arrive at pin 29,30,31 and 32. 4. Check for Master clock at Pin 39 of Q8501. I

35、f NO 5. Go and check Q114 pin 5 and 6 Xtal. If OK got to 6. If NO Q114 or X is not working. Replace Q114 and X103. 6. Check Pin 23 and 24 to see if MCKO2 and MCK01 are running. If YES 7. Check for data out at pin 9 of Q8501. If YES 8. Check for the data again at pin 8 of Q114. If YES 9. Look for the

36、 data return at pin 20 and sample rate at pin 19. If NO Q114 is possibly defective. 10. Pin 19 through 23 of Q114 working no Audio. Check for data present at pin 22 of Q707. If OK 11. Check for DC state at connector P7001A AMUT. If high (.400vdc) go back to DSP pin 30 of Q707. This point also should

37、 have a clock coming from Q702 pin 5. If NO 12. Check for the ripple voltage level on this IC Q702 and condition of X701 oscillation level. No distortion allowed. If NO check Q702 for defect or X701. Replace. 13. If pin 5 of Q702 is good, Check DC voltage of Q707 pin 8,9,10,11,14,15,16,17 (8bit line

38、) to the memory IC Q710. They should all read equal and just about 3.4Vdc. Data on all pins should be identical. If not Q710 is defective with Q708 and Q709 on suspect list. It is also worth noting that before assuming Q710, Q708, Q709 is bad, check for broken or loose R7711 through R7718. 14. When

39、normal the following DC voltages appear at the following pins. See chart. Input is DVD digital set for PCM output or a CD player can be used. Pin# 01 02 03 04 05 06 07 08 09 10 11 DC volt 3.3 0 0 0 3.3 0 0 3.3 3.3 3.3 3.3 Pin# 12 13 14 15 16 17 18 19 20 21 22 DC volt 3.3 0 3.3 3.3 3.3 3.3 4.8 3.3 4.

40、9 3.3 .9 Pin# 23 24 25 26 27 28 29 30 31 32 33 DC volt 3.3 0 1.7 1.7 .9 1.7 1.7 1.7 0 2.8 2.2 Pin# 34 35 36 37 38 39 40 41 42 43 44 DC volt 3.4 0 4.8 3.3 3.3 1.1 1 1 1.7 1.7 1.7 Input Coax 1 Setting Digital Q114 pin reference as follows. X103 is off since input is digital. Pin 12 data is OK Q707 ope

41、rating as PCM, digital input. Fig1 Fig2: Pin 26 and 27 clock is OFF when digital signal is present at pin 12. Pin 15 has no signal. X701 is oscillating and is within spec12.2Mhz Q707 (problem begins to show at:) Pin 39 and 41 has no data. Pin 30 appears this way. Data is present at pin 20. (.15us) W

42、ithout input signal (.6us) Pin 19 and pin 20 appears like this when signal is present at pin 12 Q114, pin 23 and 24 clock is present and appears normal. Fig2 Pin 29 At this point a re-check of pin 8 through 17 reveled that some of the data line DC voltages were not as they should be. See chart. Q710

43、 Defective. Replaced and unit worked. Pin 41 has a problem as seen. This point is normally 4.5vpp rather than .636vpp. The data appears to be corrupted or very low. If the unit is working properly this point becomes very high and clear data is present. At the same time when the unit appears to work,

44、 Q707 temperature runs wormer than when it is not. 575 AM Noise ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?