Arcam-Alpha10DaveModul-pwr-sm 电路图 维修手册.pdf

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1、ALPHA 10 DAVE MODULE SERVICE MANUALALPHA 10 DAVE MODULE SERVICE MANUAL Issue 1 May 99 Page 1 of 20 Alpha 10 DAVE Module Service Manual Issue 1 Paul Newton/Richard Martin May 99 CONTENTS Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Circuit description . . . . . . . .

2、. . . . . . . . . . . . . . . . . . . 1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Summary Using the Alpha 10

3、s modular design concept, the DAVE Module is designed so that you can just plug it into an existing Alpha 10 integrated amplifier and it will convert that unit into a Digital Home Cinema System. The DAVE Module consists of a bought in module from Sample Rate Systems (SRS) in Finland which is capable

4、 of decoding SPDIF information to extract Dolby Digital or DTS Digital for Surround sound information or Stereo information. It is also capable of analogue to digital conversion so that either Sub Woofer information or Dolby Pro-Logic information can be extracted and outputted. The rest of the modul

5、e consists of a PSU, microprocessor, fan for cooling, audio/video switching and muting, on screen display generator which is tapped into the video monitor out lines and digital inputs for both optical and coaxial digital audio. Circuit description Supplies and Start Up In Standby and Soft Power Down

6、 of the Alpha 10 the Micro Processor, Temperature Sensor and Fan Circuits are powered up due to the fact that these supplies are derived from the Standby power supply of the Alpha 10 Integrated Amplifier. When the unit is brought out of Standby or Soft Power Down, the rest of the rails come on excep

7、t for the positive and negative 5V rails. The positive 5V rail will not start up until the ON/OFF pin of the switching regulator (Z25) goes low. This is at approximately the same time that the Relays on the out-put of the Alpha 10 Amplifier un-mute. The negative 5V switching regulator (Z24) will not

8、 power up until the positive 5V rail gets to about 4.2V. These switching regulators are not powered up until then, due to the high switch on currents. It should be noted that the two switching regulators are fairly sensitive and disruption of the 52kHz switching signal will may cause damage to both

9、the Alpha 10 and the DAVE Module. Fan Control Circuit The fan circuit is controlled by a temperature sensor (Z21), the output pins of which are normally high. There is normally a voltage across the fan connected to SK19 but it is not normally enough to turn the fan motor. When the temperature rises

10、above 55 deg.C (set by the resistor network on Z21), the Out1 pin goes LOW and the voltage across SK19 is increased so that the fan motor will turn over at a relatively low speed. To make sure the fan starts, the effect of C58 charging causes there to be approximately 12V across the fan. Out2 will g

11、o low at 65 deg. C and this informs the H8 micro as well as causing the voltage across the fan, and hence the fan speed, to increase by switching Q6 on. If the the temperature of the unit remains at this point for too long a period then the H8 will intervene. It should be noted that this circuit is

12、running during Standby and Soft Power Down and hence the fan can operate during these modes. Audio and the SRS Digital Audio Surround Processor Module The audio types on the DAVE Module comes in two types:- 1Analogue audio can be fed into the module from the input connectors of the Alpha 10s pre- am

13、plifier. It is routed through a pair of Analogue Multiplexers (Z1 for Right and Z2 for Left hand channels), and then on through to the SRS Digital Surround Module. 2Digital audio from CD, DVD, Laser Disc or other SPDIF generating sources can be fed in through either one of the two coaxial or two opt

14、ical inputs and through a Digital Multiplexer (Z3) to the SRS Digital Surround Module. The SRS Module performs the following functions :- It takes in the analogue audio and converts it into digital audio and bass signal. It takes in SPDIF information and works out what encoding system if any is bein

15、g used and decodes the information into one of the Digital Surround Modes or Digital Stereo and bass signals. If it is in a stereo mode then further processing can be done on the signal which includes Dolby Pro-Logic decoding. The digital channels are then converted back to RadioFans.CN 收音机爱 好者资料库 A

16、LPHA 10 DAVE MODULE SERVICE MANUALALPHA 10 DAVE MODULE SERVICE MANUAL Issue 1 May 99 Page 2 of 20 analogue and the bass is dealt with separately to the rest of the audio. Volume and muting is dealt with after this and then the bass is added back to the appropriate channels and the output is buffered

17、 before being passed out of the module. The Left and Right audio channels are passed back down to the pre-amplifier of the Alpha 10. The Surround, Centre and Sub channels are fed through a Muting relay (RLY1) and on to a set of RCA Phono connectors on the back of the module. This relay can be contro

18、lled by either the H8 Micro or by the PROT1 line which goes High during any startup or shut down of the Alpha 10 causing a mute. Video and On Screen Display (OSD) Generation The Video for the module comes in a number of formats and standards which the board is capable of dealing with. Composite Vide

19、o is where the video information of colour, luma. and syncs. are combined. The inputs are fed in from the back of the module via RCA Phono connectors and through a set of analogue multiplexers. The one is for output to a VCR (Z11) and the other to a Monitor output (Z28). The Monitor output is Sync-t

20、ip Clamped before being fed both to the OSD section and another multiplexer (Z29) which inserts OSD information into the Video information. Both the VCR output and the Monitor output are buffered (Z10) before being fed through to their outputs. The Sync-tip Clamping consists of a two transistor cons

21、tant current source which is used to keep the luma signals a approximately ground reference although syncs, depending on content of signal, can drop below. This circuit gives a reference to which the OSD signal can be applied fairly accurately. S-Video is where there are separate lines for the luma.

22、/sync. information and colour information. These are fed in on 4pin mini DIN connectors and are again fed through multiplexers to a VCR output (Z8) and Monitor output (Z27). The luma line is Sync-tip Clamped and the colour ac coupled before they are fed through another multiplexer (Z12) to have the

23、OSD information added. In this case only the luma. (Y) line of the Monitor multiplexer is fed to the OSD IC. The Monitor and VCR outputs are buffered (Z13 and Z9 respectively) before being outputted. Component video is very similar to S-Video except in this case the colour information line is furthe

24、r split into two separate colour difference signal lines R-Y and B-Y. As this input is only used so OSD can be inserted onto the video being viewed, there is no VCR output and no input multiplexers, as with the composite and S-video inputs. The luma line for the component video is dealt with as the

25、luma in the S-video except its path is through multiplexer Z12 and buffer Z30. As the OSD generator (Z18) does not deal directly with R- Y and B-Y colour difference signals these, levels are generated by potential dividers on Z6 which will give a blue signal. These are only used in full page mode if

26、 there is a blue output (pin 16 Z18) but no character output (pin 18 Z18), such as the outline box, but no actual text output (pin 15 Z18). This is controlled by Z6 (gate1) and Z19 (gate3), inserted onto the R-Y and B-Y signals by Z29 and buffered by Z30. The rest of Z19 is used to Black Level Clamp

27、 the R-Y and B-Y input signals. This is done, because these signals are referenced to ground, by Z19 during the line blanking period, the signal for this being generated from the composite sync signal form Z20. The OSD section can be split down into several sub sections: the input stage has a multip

28、lexer (Z14) to select the relevant type of video to sync. onto. This is then buffered (Z15) before being fed through to the OSD generator IC and 50/60 Hz recognition system. the sync. separator IC (Z20) outputs a vertical sync. line to the H8 Micro which is checked to see if the timings are correct

29、in which case the relevant clocks are switched, if the video is valid. This is so if the vertical sync. line is either pulsing at greater than equal to once per second or it is permanently high. If the timing between these pulses is either 16ms or 20ms then either 50Hz or 60Hz video is assumed or th

30、e last valid video standard is used. This IC also generates a composite sync signal which is used to time the Sync-tip Clamping of the R-Y and B-Y of the component video signal. the clock circuit has two crystals, the 14M31818Hz is for NTSC 60Hz and the 17M73447Hz is for PAL 50Hz. Most 50Hz and 60Hz

31、 video systems can be synchronised to but the OSD IC will not output the correct colour information. These are switched by Z7 and Z14 from the Micro. the OSD IC is controlled by a three wire SPI serial data bus and is completely software controlled. It may output spurious information until it is res

32、et properly by the micro processor. It Guarantees OSD characters and insertion of both colour and luma. It is also capable of generating the correct sync. timings so that it can blank the screen when either a non-valid input is selected or if a no valid video information is available. There are seve

33、ral pins to note on this chip which may affect performance. LESCREEN (approx. 1.3V) and LECHAR (approx. 1.5V)set the levels RadioFans.CN 收音机爱 好者资料库 ALPHA 10 DAVE MODULE SERVICE MANUALALPHA 10 DAVE MODULE SERVICE MANUAL Issue 1 May 99 Page 3 of 20 for the OSD back ground and text during insertion ont

34、o video other wise the levels are set internally. RES is a reset timing pin for correct operation of the device after power up and FTR sets the phase lock loop response. Micro Processor The Micro Processor on the DAVE Module is 16Mz Hitachi H8 series with 60kB of Flash Programable Memory and is init

35、ially supplied un-programmed. The connector (SK18) can be used to program or reprogram the H8 with the aid of a purchasable flash programming module (this is supplied as part of their emulator kit). On initial power up the HOLTEC micro synchronises the reset of the H8 micro with the PIC on the displ

36、ay panel by pulling MRES high causing the output of Z31 to go low and hence the reset pin (1) of the H8 micro. The Micro has a number of functions which include: communicating with the PIC and HOLTEC micros on the Alpha 10 Integrated Amplifier via an I2C bus. As part of this it takes over some of th

37、e functionality of the PIC such as control of the Pre- amplifier, the front panel display information and error response to the Holtec Micro. communicating with the SRS Digital Surround Module via SPI bus and controlling its decoding modes, configuration volume and muting. communicating with the OSD

38、 via a 3 wire SPI bus and also monitoring the vertical sync. line for video timings and switching in the appropriate clock crystal. controlling the audio and video paths including relay muting functions. monitoring for a high temperature condition with the aid of the temperature sensor IC (Z21). The

39、 temperature sensor will automatically control the speed of the fan for temperatures of above 55 Deg. C and above 65 Deg. C will also tell the micro. has a number of embedded service and test modes which are listed below. There are two embedded modes in the software which are of use for testing the

40、unit. 1If the PHONO/AUX and CONTROL buttons are pressed when the unit is brought out of stand-by then two extra pages appear in the set-up menu for the DAVE Module which is accessed by either pressing RESTORE followed by MENU on the remote control or by pressing both MODE/ZONE and CONFIRM together o

41、n the front of the Alpha 10. The new pages of the menu are:- Page 6 : a list of the micro processors and their reported software versions including those on the SRS Module. Page 7 : a dump of the fault logs held in the eeprom of the A10 amplifier. Note : if you need to erase the values held in the e

42、rasable section then press VCR in this page. 2A test mode which can be entered by simultaneously pressing the front panel CD and CONTROL buttons while switching out of stand- by. Hold the buttons down until “DAVE Self Test” appears on the display. This mode puts the unit into full range speakers mod

43、e with no delays. The following table gives a list of the inputs and outputs selected and what the unit should do. The tests can be stepped through by either the use of the UP and DOWN codes or by entering the test number eg “01 using the CR9000 remote control handsets number keys when it is in ARCA

44、M AUDIO mode. It should be noted, that because in this mode 7 and 9 have the same code, the ENTER button becomes 9. NB:To exit this test mode you have to unplug the unit from the mains supply to rest it. RadioFans.CN 收音机爱 好者资料库 ALPHA 10 DAVE MODULE SERVICE MANUALALPHA 10 DAVE MODULE SERVICE MANUAL I

45、ssue 1 May 99 Page 4 of 20 Test No.Input Source Video InputAudio InputUnit Function 1NoneNoneNoneGenerate Full Page Blue Screen in PAL 50Hz. Audio to be Muted. 2NoneNoneNoneGenerate Full Page Blue Screen in NTSC 60Hz. Muted Audio. 3DVDComponent Only NoneGenerate OSD on component video only. Muted Au

46、dio. 4DVDS-Video OnlyOptical 1Generate OSD on S-Video Only. Audio to Auto Detection on Digital Input 5AVS-Video Only Optical 2Generate OSD on S-Video Only. Audio to Auto Detection on Digital input 6AUXS-Video OnlyCoaxial 1Generate OSD on S-Video Only Audio to Auto Detection on Digital Input 7VCRS-Vi

47、deo Only Coaxial 2Generate OSD on S-Video Only Audio to Auto detection on Digital Input No output on VCR Out 8DVDComposite Only AnalogueGenerate OSD on Composite Only Audio to Analogue Stereo with SUB from SRS 9AVComposite Only AnalogueGenerate OSD on Composite Only Audio to Analogue Stereo with SUB

48、 from SRS 10AUXComposite Only AnalogueGenerate OSD on Composite Only Audio to Analogue Stereo with SUB from SRS 11VCR (Tape2) Composite Only AnalogueGenerate OSD on Composite Only Audio to Analogue Stereo with SUB from SRS No output on VCR Out 12CDNoneAnalogueGenerate OSD Blue Screen Audio to Analog

49、ue Stereo with SUB from SRS No output on any VCR Video Out 13TUNERNoneAnalogueGenerate OSD Blue Screen Audio to Analogue Stereo with SUB from SRS No output on any VCR Video Out 14TAPE 1NoneAnalogueGenerate OSD Blue Screen Audio to Analogue Stereo with SUB from SRS No output on any VCR Video Out ALPHA 10 DAVE MODULE SERVICE MANUALALPHA 10 DAVE MODULE SERVICE MANUAL Issue 1 May 99 Test No.Input Source Video InputAudio InputUnit Function Page 5 of 20 15DVDAny with 60Hz Video Coaxial 1Auto Detect for 60Hz Video as Normal Detect and output Dolby Digital 5.1 Only 16DVDAny with 50Hz Vi