Cyrus-AV5-pre-sm 电路图 维修手册.pdf

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1、SERVICE MANUAL SPECIFICATIONS Multi-channel decoding systemsDolby Digital, DTS, PCM linear Analogue input sensitivity2V / 47k? Digital input sensitivity500mV pk-pk / 75? Output voltage3.9V max all channels Tape output voltage2V max Signal to noise ratio-90dB Awtd vol max -117dB Awtd vol -28dB to min

2、imum THD (Digital input)0.005% THD (Analogue input)0.006% Frequency response3Hz to 20kHz Dimensions (HxWxD)73 x 215 x 360mm FinishBlack CYRUS AV5 DIGITAL PREAMPLIFIER RadioFans.CN 收音机爱 好者资料库 CYRUS AV5 SERVICE CAUTIONS These two symbols shown are displayed prominently on the Cyrus AV5 base cover labe

3、l. They indicate that the following cautions must be observed by all personnel- CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER OR BACK. THERE ARE NO USER SERVICEABLE PARTS INSIDE THE PRODUCT. ALWAYS REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. RadioFans.CN 收音机爱 好者资料库 CYRUS A

4、V5 TYPE IDENTIFICATION July 20001 Rating label Each Cyrus AV 5 carries a rating label on the rear panel which includes details of the following: Nominal power voltage 230V For use on nominal 220V - 240V AC mains supply. AC fuse rating The AC fuse rating is also shown on the label. If replacing the A

5、C fuse it is essential that the replacement fuse is exactly the same specification as the original fuse, supplied by Cyrus. All mains fuses have a Timelag blow characteristic. Power consumption The power consumption figure is indicated under conditions of full power drive into the rated speaker load

6、. Serial number Each Cyrus AV 5 carries a serial number code which identifies the following- ? Type of product ? Market destination ? Build number The serial number is visible on the baseplate. It is therefore important to ensure that a baseplate removed from a product is re-fitted to the same produ

7、ct. In any communications with Cyrus Service or Quality departments it is essential that the full serial number is quoted so that original specification parts and service information may be supplied. RadioFans.CN 收音机爱 好者资料库 CYRUS AV5 BLOCK DIAGRAM July 20002 CYRUS AV5 TECHNICAL DESCRIPTION July 2000

8、3 Digital/analogue input selection and digital out The coaxial digital inputs are buffered by differential receivers IC202/401 which convert the input signal level from 0.5V peak to peak (std SPDIF level) to 5V peak to peak. The output from the coaxial receivers and the optical receivers are routed

9、to an 8 way multiplexer IC404 which selects a digital input. The output from the multiplexer is decoded by IC502 and then routed to digital output socket. The analogue inputs are buffered by IC405/6/7 and then selected by IC404. Preparation of input signals prior to DSP Analogue inputs are converted

10、 to digital format by the CODECs 20bit ADC converters. The digital output from the CODECs ADC is then sent in I2S format to the DSP. When the CODEC is set to decode an analogue input the 12.288MHz clock (pin 28 IC502) comes from the crystal module (X801) via IC804 (which divides clock frequency by 4

11、). When the CODEC is receiving a digital input the clock is derived from the digital input using the CODECs PLL. The CODEC modes are set by the microprocessor via the SPI bus pins 3,4,5 and 6. DSP (digital signal processor). All signals pass through the DSP (IC802) including stereo, pro-logic, DTS o

12、r Dolby Digital. The signal is received from the CODEC into its compressed data interface. The DSP can : When receiving stereo PCM ? Convert to Pro-Logic ? Apply bass management to speakers ? Convert to 3 channel stereo ? Pass the PCM straight through as stereo When receiving DTS ? Decode DTS stream

13、 into 5.1 format (No bass management or down mixing) When receiving Dolby Digital ? Apply bass management to speakers ? Convert to 3 channel stereo ? Down mix channels ? Convert to stereo ? Decode as 5.1 The microprocessor will set the DSP to the appropriate mode (stereo/multi-channel) selected by t

14、he user. The DSP will also send information to the microprocessor to indicate decoding status e.g. receiving AC3 stream. The DSP is controlled by the microprocessor via the SPI bus pins 7, 19, 6, 18 and 20. The program code for the DSP is stored externally in a memory IC905, connected via IC903/4 ac

15、ting as address expanders for the memory. CYRUS AV5 TECHNICAL DESCRIPTION July 20004 Digital to analogue conversion The digital audio output from the DSP is routed back to the CODEC via data lines from pins 39-41. Word select pin 42 and bit-clock pin 43 to give 3 stereo signals (5.1 channels). The C

16、ODEC contains a six channel DAC. The DAC converts the six digital channels to analogue and the signals are AC coupled to the filter stage. The filter stages take out the high frequency over-sampling noise. All filters are then AC coupled to the volume control stage. Volume controls and output buffer

17、s The volume control stage uses two digitally controlled triple volume control ICs. The controls are connected to the control microprocessor via the SPI bus. The volume controls are used to set both the volume and any channel balance offsets applied by the user to level match between speakers. The v

18、olume controls run off +/- 6VDC, regulated from the +/-12VDC rails by T601/602. The output is then buffered by IC604/5/6. Mute circuit The output mute circuit T702/7 is connected to the output and short circuits the audio signals. The mute circuit is used during power up/down and standby and is cont

19、rolled by the control microprocessor and a little hardware based circuit to detect power supply condition T101. Tape output The tape output is only active when set to decode stereo. DTS cannot be down mixed to stereo and hence cannot be recorded via the analogue tape out. The left and right audio ou

20、tputs from the post DAC analogue filters are connected to the tape output sockets. When set to stereo the tape output sockets are un-muted (T701/19/20) allowing recording to take place. In all other operation modes the tape output is muted. Auto calibration microphone The AV5 includes a facility to

21、allow the automated set-up of channel balance and speaker distance setting. When using auto level the DSP produces noise on each channel in turn, the control microprocessor will adjust the volume automatically to achieve the same reading from the supplied microphone for each speaker channel. The set

22、tings are stored in the microprocessor memory and are applied to all volume control settings. The distance setting works in a similar way except the noise is burst and the time taken for the noise burst to reach the speaker allows the microprocessor to calculate the speaker distances. The distance s

23、ettings are stored in the microprocessors memory and the appropriate delays are set in the DSP. The microphone uses a 1.5V button cell, type L1154, AG13, LR44, 157, V13GA, RW82 or A76. It is essential that the battery is removed when the microphone is not being used to prevent the battery from disch

24、arging. The battery may discharge over night if left in the microphone. The output from the microphone is boosted by IC1006, rectified by IC1007B, and averaged by C1025. When measuring the speaker level T1002 is switched on connecting C1026 to increase the averaging time constant. The output from th

25、e averaging circuit is buffered and sent to an analogue input on the control microprocessor to analyse level or timing. CYRUS AV5 TECHNICAL DESCRIPTION July 20005 Microprocessor The microprocessor forms the interface between the user controls to the various circuit blocks. At power up and power down

26、 the processor is reset by IC1105. The amount of output lines is boosted by ICs IC1205/6 adding an extra 16 control lines. Power Supply The power supply is linear and regulates to: +5V for miscellaneous digital circuits +5V for the CODEC +3.3V for the DSP +/-12V for the analogue circuits +/-6V for t

27、he volume controls circuits. All regulators are 78XX series except for the 3.3V design which uses an LM317 adjustable regulator. The transformer includes a re-settable thermal fuse which will trip under short circuit conditions. A separate supply C113 has been included for the muting circuit to prev

28、ent power off thumps. Display Display contrast is set by R1313/1314. The back light is turned on/off by T1301/2/3. CYRUS AV5 PCB COMPONENTS July 20006 RESISTORS R101SMD0805330RMF 1/8W 1% R102SMD08052.7kMF 1/8W 1% R103SMD08051kMF 1/8W 1% R104SMD0805470RMF 1/8W 1% R105SMD0805100kMF 1/8W 1% R106SMD0805

29、10kMF 1/8W 1% R107SMD080547kMF 1/8W 1% R108SMD0805100kMF 1/8W 1% R109SMD080510kMF 1/8W 1% R110SMD080510kMF 1/8W 1% R111SMD080510kMF 1/8W 1% R112SMD080510kMF 1/8W 1% R120AXIAL0.54.7RMF 1/4W 5% R121AXIAL0.54.7RMF 1/4W 5% R122SMD080510kMF 1/8W 1% R123SMD0805NOT FITTED R124SMD0805NOT FITTED R125SMD0805N

30、OT FITTED R126SMD0805NOT FITTED R201SMD080575RMF 1/8W 1% R202SMD080575RMF 1/8W 1% R214SMD080547RMF 1/8W 1% R401NOT FITTED R402SMD080575RMF 1/8W 1% R403SMD080575RMF 1/8W 1% R404SMD080575RMF 1/8W 1% R405SMD080547RMF 1/8W 1% R406SMD080547RMF 1/8W 1% R407SMD0805270RMF 1/8W 1% R408SMD0805100RMF 1/8W 1% R

31、409SMD080547RMF 1/8W 1% R410SMD080547RMF 1/8W 1% R411SMD080547RMF 1/8W 1% R412SMD080547kMF 1/8W 1% R413SMD080547kMF 1/8W 1% R414SMD080547kMF 1/8W 1% R415SMD080547kMF 1/8W 1% R416SMD080547kMF 1/8W 1% R417SMD080547kMF 1/8W 1% R422SMD08052.2kMF 1/8W 1% R423SMD08051.4kMF 1/8W 1%Was originally 2.2k. Redu

32、ced to improve input overload R428SMD08052.2kMF 1/8W 1% R429SMD08051.4kMF 1/8W 1%Was originally 2.2k. Reduced to improve input overload CYRUS AV5 PCB COMPONENTS July 20007 R434SMD08052.2kMF 1/8W 1% CYRUS AV5 PCB COMPONENTS July 20008 R435SMD08051.4kMF 1/8W 1%Was originally 2.2k. Reduced to improve i

33、nput overload R440SMD08052.2kMF 1/8W 1% R441SMD08051.4kMF 1/8W 1%Was originally 2.2k. Reduced to improve input overload R446SMD08052.2kMF 1/8W 1% R447SMD08051.4kMF 1/8W 1%Was originally 2.2k. Reduced to improve input overload R452SMD08052.2kMF 1/8W 1% R453SMD08051.4kMF 1/8W 1%Was originally 2.2k. Re

34、duced to improve input overload R501SMD080547RMF 1/8W 1% R502SMD0805100kMF 1/8W 1% R503SMD08055.6kMF 1/8W 1% R504SMD080547RMF 1/8W 1% R505SMD080547RMF 1/8W 1% R506SMD080547RMF 1/8W 1% R601SMD0805100kMF 1/8W 1% R602SMD0805100kMF 1/8W 1% R603SMD0805100kMF 1/8W 1% R604SMD0805100kMF 1/8W 1% R605SMD08051

35、00kMF 1/8W 1% R606SMD0805100kMF 1/8W 1% R607SMD08055.1kMF 1/8W 1% R608SMD08055.1kMF 1/8W 1% R609SMD08055.1kMF 1/8W 1% R610SMD08055.1kMF 1/8W 1% R611SMD08055.1kMF 1/8W 1% R612SMD08053.6kMF 1/8W 1% R613SMD080510kMF 1/8W 1% R614SMD080510kMF 1/8W 1% R615SMD080510kMF 1/8W 1% R616SMD080510kMF 1/8W 1% R617

36、SMD080510kMF 1/8W 1% R618SMD08057.5kMF 1/8W 1% R619SMD08052.2kMF 1/8W 1% R620SMD08052.2kMF 1/8W 1% R621SMD08052.2kMF 1/8W 1% R622SMD08052.2kMF 1/8W 1% R623SMD08052.2kMF 1/8W 1% R624SMD08052.2kMF 1/8W 1% R625SMD08052kMF 1/8W 1% R626SMD08052kMF 1/8W 1% R627SMD08052kMF 1/8W 1% R628SMD08052kMF 1/8W 1% R

37、629SMD08052kMF 1/8W 1% R630SMD08052kMF 1/8W 1% CYRUS AV5 PCB COMPONENTS July 20009 R631SMD08052.4kMF 1/8W 1% R632SMD08052.4kMF 1/8W 1% R633SMD08053kMF 1/8W 1% R634SMD08053kMF 1/8W 1% R635SMD080522kMF 1/8W 1% R636SMD080522kMF 1/8W 1% R637SMD080522kMF 1/8W 1% R638SMD080522kMF 1/8W 1% R639SMD080522kMF

38、1/8W 1% R640SMD080522kMF 1/8W 1% R641SMD08052.2kMF 1/8W 1% R642SMD08052.2kMF 1/8W 1% R643SMD08052.2kMF 1/8W 1% R644SMD08052.2kMF 1/8W 1% R645SMD08052.2kMF 1/8W 1% R646SMD08052.2kMF 1/8W 1% R647SMD08052.2kMF 1/8W 1% R648SMD08052.2kMF 1/8W 1% R649SMD08052.2kMF 1/8W 1% R650SMD08052.2kMF 1/8W 1% R651SMD

39、08052.2kMF 1/8W 1% R652SMD08052.2kMF 1/8W 1% R701SMD080510kMF 1/8W 1% R702SMD080510kMF 1/8W 1% R703SMD0805220RMF 1/8W 1% R704SMD0805220RMF 1/8W 1% R705SMD0805220RMF 1/8W 1% R706SMD0805220RMF 1/8W 1% R707SMD08052.2kMF 1/8W 1% R708SMD08052.2kMF 1/8W 1% R711SMD08052.2kMF 1/8W 1% R712SMD08052.2kMF 1/8W

40、1% R713SMD0805220RMF 1/8W 1% R714SMD08052.2kMF 1/8W 1% R715SMD0805220RMF 1/8W 1% R716SMD08052.2kMF 1/8W 1% R719SMD08052.2kMF 1/8W 1% R720SMD08052.2kMF 1/8W 1% R721SMD0805560RMF 1/8W 1% R722SMD0805560RMF 1/8W 1% R801SMD08054.7kMF 1/8W 1% R802SMD080547RMF 1/8W 1% R803SMD080547RMF 1/8W 1% R804SMD080568

41、kMF 1/8W 1% R805SMD0805100kMF 1/8W 1% R806SMD0805100kMF 1/8W 1% CYRUS AV5 PCB COMPONENTS July 200010 R807SMD0805100kMF 1/8W 1% R808SMD080547RMF 1/8W 1% R809SMD080547RMF 1/8W 1% R810SMD080547RMF 1/8W 1% R811SMD080547RMF 1/8W 1% R812SMD0805NOT FITTED R813SMD080547RMF 1/8W 1% R814SMD080547RMF 1/8W 1% R

42、815SMD0805100kMF 1/8W 1% R816SMD0805NOT FITTED R817SMD0805100kMF 1/8W 1% R818SMD0805100kMF 1/8W 1% R819SMD080547RMF 1/8W 1% R820SMD080547RMF 1/8W 1% R821SMD080547RMF 1/8W 1% R901SMD0805100kMF 1/8W 1% R1006AXIAL0.54.7RMF 1/4W 5% R1007AXIAL0.54.7RMF 1/4W 5% R1011SMD080547RMF 1/8W 1% R1012SMD080547RMF

43、1/8W 1% R1013SMD080547RMF 1/8W 1% R1014SMD08051kMF 1/8W 1% R1015SMD08051kMF 1/8W 1% R1016SMD08051kMF 1/8W 1% R1017SMD080547RMF 1/8W 1% R1018SMD0805100kMF 1/8W 1% R1019SMD080547RMF 1/8W 1% R1020SMD080547RMF 1/8W 1% R1021SMD080547RMF 1/8W 1% R1022SMD0805NOT FITTED R1023SMD0805NOT FITTED R1024SMD08051k

44、MF 1/8W 1% R1027SMD0805100kMF 1/8W 1% R1028SMD0805100kMF 1/8W 1% R1029SMD080547RMF 1/8W 1% R1030SMD08054.7kMF 1/8W 1% R1031SMD080547RMF 1/8W 1% R1032SMD08054.7kMF 1/8W 1% R1033SMD080510kMF 1/8W 1% R1034SMD080510kMF 1/8W 1% R1035SMD080510kMF 1/8W 1% R1036SMD0805100kMF 1/8W 1% R1037SMD08051kMF 1/8W 1%

45、 R1038SMD080510kMF 1/8W 1% R1039SMD0805470kMF 1/8W 1% R1101SMD080510MMF 1/8W 1% CYRUS AV5 PCB COMPONENTS July 200011 R1102SMD08051kMF 1/8W 1% R1103SMD080547kMF 1/8W 1% R1104SMD0805100kMF 1/8W 1% R1201SMD080510kMF 1/8W 1% R1301AXIAL0.51RMF 1/4W 5% R1302SMD080510kMF 1/8W 1% R1303SMD12063.3RMF 1/8W 1%

46、R1304SMD0805680RMF 1/8W 1% R1305SMD080510kMF 1/8W 1% R1306SMD080510kMF 1/8W 1% R1307SMD080510kMF 1/8W 1% R1308SMD080510kMF 1/8W 1% R1309SMD080510kMF 1/8W 1% R1310SMD080510kMF 1/8W 1% R1311SMD080547RMF 1/8W 1% R1312SMD080547RMF 1/8W 1% R1313SMD0805680RMF 1/8W 1% R1314SMD0805270RMF 1/8W 1% R1315SMD080

47、547RMF 1/8W 1% R1316SMD080547RMF 1/8W 1% R1317SMD080547RMF 1/8W 1% Key: MF = metal film. NFR = non flammable resistor. MRS25 = axial metal film resistor SMD-0805 = refers to surface mount device size profile 0805 RESISTOR PACKS RP501RES CAT16.447R4 off resistor pack RP502RES CAT16.447R4 off resistor

48、 pack RP503RES CAT16.447R4 off resistor pack RP504RES CAT16.447R4 off resistor pack RP801RES CAT16.447R4 off resistor pack RP802RES CAT16.447R4 off resistor pack RP803RES CAT16.447R4 off resistor pack RP804RES CAT16.447R4 off resistor pack RP805RES CAT16.447R4 off resistor pack RP901RES CAT16.447R4

49、off resistor pack RP902SIL_9W100k8-Commoned resistor pack RP1101RES CAT16.447R4 off resistor pack RP1102RES CAT16.447R4 off resistor pack RP1103RES CAT16.447R4 off resistor pack RP1104RES CAT16.447R4 off resistor pack RP1105RES CAT16.447R4 off resistor pack RP1106RES CAT16.447R4 off resistor pack RP1107RES CAT16.447R4 off resistor pack CYRUS AV5 PCB COMPONENTS July 200012 RP1201RES CAT16.447R4 off resistor pack RP1202RES CAT16.447R4 off resistor pack RP1203RES CAT16.447R4 off resistor pack RP1204RES CAT16.447R4 off resistor pack RP1301RES CAT16.447R4 off