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Alpha 10 dave Service

ALPHA 10 DAVE MODULE SERVICE MANUALALPHA 10 DAVE MODULE SERVICE MANUAL Issue 1 May 99
Alpha 10 DAVE Module Service Manual
Issue 1 Paul Newton/Richard Martin May 99
CONTENTS
Summary ..................................1
Circuit description ...........................1
Specifications ..............................5
Setup Menu ................................8
Parts List .................................15
Summary
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 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 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 go 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 running during Standby and Soft Power Down and hence the fan can operate during these modes.
The DAVE Module consists of a bought in module from Sample Rate Systems (SRS) in Finland which is capable 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 module 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 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 except 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 power up until the positive 5V rail gets to about 4.2V. These switching regulators are not powered up until then, due to
Audio and the SRS Digital Audio Surround Processor Module
The audio types on the DAVE Module comes in two types:­1 Analogue audio can be fed into the module from
the input connectors of the Alpha 10's pre­amplifier. 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.
2 Digital audio from CD, DVD, Laser Disc or other
SPDIF generating sources can be fed in through either one of the two coaxial or two optical 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 being 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
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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 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 controlled 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 Video 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-tip 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 constant 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./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 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 further 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 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 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 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 multiplexer (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 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 the 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 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 reset 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 several pins to note on this chip which
may affect performance. LESCREEN (approx.
1.3V) and LECHAR (approx. 1.5V)set the levels
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for the OSD back ground and text during insertion onto 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 initially 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 display 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 the functionality of the PIC such as control of the Pre­amplifier, 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 via a 3 wire SPI bus and also monitoring the vertical sync. line for video timings and switching in the appropriate clock crystal.
pressing RESTORE followed by MENU on the remote control or by pressing both MODE/ZONE and CONFIRM together on 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 erasable section then press VCR in this page.
2 A test mode which can be entered by
simultaneously pressing the front panel CD and CONTROL buttons while switching out of stand­by. Hold the buttons down until “DAVE Self Test” appears on the display.
This mode puts the unit into full range speakers mode 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 ARCAM ‘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.
• 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 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 unit.
1 If 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
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ALPHA 10 DAVE MODULE SERVICE MANUALALPHA 10 DAVE MODULE SERVICE MANUAL Issue 1 May 99
Test No. Input
Video Input Audio Input Unit Function
Source
1 None None None Generate Full Page Blue Screen in PAL 50Hz. Audio to
be Muted.
2 None None None Generate Full Page Blue Screen in NTSC 60Hz. Muted
Audio.
3 DVD Component
Only
None Generate OSD on component video only.
Muted Audio.
4 DVD S-Video Only Optical 1 Generate OSD on S-Video Only.
Audio to Auto Detection on Digital Input
5 AV S-Video
Only
Optical 2 Generate OSD on S-Video Only.
Audio to Auto Detection on Digital input
6 AUX S-Video Only Coaxial 1 Generate OSD on S-Video Only
Audio to Auto Detection on Digital Input
7 VCR S-Video
Only
Coaxial 2 Generate OSD on S-Video Only
Audio to Auto detection on Digital Input No output on VCR Out
8 DVD Composite
Only
9 AV Composite
Only
10 AUX Composite
Only
11 VCR
(Tape2)
Composite Only
Analogue Generate OSD on Composite Only
Audio to Analogue Stereo with SUB from SRS
Analogue Generate OSD on Composite Only
Audio to Analogue Stereo with SUB from SRS
Analogue Generate OSD on Composite Only
Audio to Analogue Stereo with SUB from SRS
Analogue Generate OSD on Composite Only
Audio to Analogue Stereo with SUB from SRS No output on VCR Out
12 CD None Analogue Generate OSD Blue Screen
Audio to Analogue Stereo with SUB from SRS No output on any VCR Video Out
13 TUNER None Analogue Generate OSD Blue Screen
Audio to Analogue Stereo with SUB from SRS No output on any VCR Video Out
14 TAPE 1 None Analogue Generate OSD Blue Screen
Audio to Analogue Stereo with SUB from SRS No output on any VCR Video Out
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ALPHA 10 DAVE MODULE SERVICE MANUALALPHA 10 DAVE MODULE SERVICE MANUAL Issue 1 May 99
Test No. Input
Video Input Audio Input Unit Function
Source
15 DVD Any with 60Hz
Video
16 DVD Any with
50Hz Video
Coaxial 1 Auto Detect for 60Hz Video as Normal
Detect and output Dolby Digital 5.1 Only
Coaxial 1 Auto Detect to 50Hz Video as Normal
Detect and output DTS Surround 5.1 Only
17 DVD Any Coaxial 1 Auto Detect Video as normal operation
Detect and output Dolby Pro Logic encoded Dolby Digital Only
18 DVD Any Stereo
Analogue
Auto Detect Video as normal Output Analogue Pro Logic decoded signal
Pro Logic
Specifications
Input Supplies
Main A10 Amplifier Rails :
A10 Positive Unregulated Stand By Supply :
A10 +8V Stand By Supply :
Module Supplies
Micro Processor and Temperature Sensor (Can be on in Stand By and Soft Power Down)
Fan (Can be on in Stand By and Soft Power Down)
+ 15V (for SRS Audio and +7V2 supply) :
- 15V (for SRS Audio and +7V2 supply) :
+48V +/-7V (@60mA with No SRS @180mA Nominal)
-48V +/-7V (@ 10mA with No SRS @ 30mA Nominal)
13V+/-2V (@20mA Nominal @ 80mA Max with Fan)
8V +/-1V (@50mA Nominal)
:
:
+5V +/- 0.25V @ 70mA
<3V @ T<55 Deg C 7V +/- 1.0V @ T>=55 Deg C 11V +/- 1.5V @ T>=65 Deg C
+15V +/- 0.5V @ 50mA typ.
-15V +/- 0.5V @ 50mA typ.
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+ 7V2 (for Analogue Audio Switching Only) :
- 7V2 (for Analogue Audio Switching Only) :
+ 5V :
- 5V :
Analogue Audio
Input Level @ Alpha 10 pre-amplifier :
Input Level @ DAVE Module :
Crosstalk at SRS Module Input :
+ 7.2V +/-5% @ 5mA typ.
- 7.2V +/- 5% @ 5mA typ.
+ 5V +/- 0.25V @ 1.2A Max.
-5V +/- 0.25V @ 100mA Max.
Nominally 1Vrms Maximum greater than 5Vrms for Multiplexers (Analogue Stereo only) Maximum greater than 2.9Vrms for SRS A/D (All other analogue modes)
Nominally 850mVrms Maximum greater than 2.5Vrms (for SRS A/D)
Better than -65dB @ 1kHz between any audio channel
Noise at SRS Module Input :
Distortion at SRS Module Input :
Relative Levels for -20dB reference Stereo Dolby Pro Logic Signal (Maximum Output, Large Speakers and Flat Trims) on DVD player analogue output.
Maximum Output Levels from SRS Module @ 0.5%Distortion
Frequency Response All speakers set to large and present
Noise on Output of Module :
Crosstalk at Output of Module :
Less than -95dBV
Less than 0.01% @1kHz
:
Typical Left and Right Levels 400 mVrms (DAVE Module Out) 450 mVrms(10 Pre Out) Surrounds and Centre +/- 1 dB (relative to Left Pre Out)
:
>8Vrms for all channels except SUB >10Vrms for SUB in worst case
:
Left, Right, Surrounds and Centre 20Hz to 20kHz @ +/-0.2dB Sub 10Hz to 70Hz +0/-3dB
Less than -95dBV except SUB Less than -85bBV for SUB
Less than 65dB @1kHz between any audio channel.
Digital Audio
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Input Level @ Coaxial Digital Inputs :
Level @ SRS Module :
Relative Levels for -20dB Dolby Digital 5.1 Signal (Maximum Output, Large Speakers and Flat Trims)
Video
Nominal Luma Input Level :
S-Video OSD Nominal Colour levels :
Component Nominal Colour Difference Levels for Blue OSD relative to Black
Frequency Response :
Greater than 500mVp-p into 75R
Greater than 400mVp-p for any Digital Input
:
Typical Left and Right Levels 650 mVrms (DAVE Module Out) 700 mVrms(10 Pre Out) Surrounds and Centre +/- 1 dB (relative to Left Pre Out) Sub +10dB +/-1 (relative to Left Pre Out)
1Vrms into 75R SYNC tip to White Level
450mVp-p into 75R for Blue
:
330mV into 75R for B-Y
-60mV into 75R for R-Y
+0/-1dB to 4.8MHz
Cross Talk :
OSD
Frame Rate :
Crystal Frequency @25degC :
Colour Standards Supported :
Better than -60dB at 1Mz
50 or 60 Hz
14.318180MHz+0/(-80ppm) for 60Hz
17.734470MHz(+0/-30ppm) for 50Hz
PAL 50Hz NTSC 60Hz (Most other 50 and 60Hz frame rate standards supported with B/W OSD)
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ALPHA 10 DAVE MODULE SERVICE MANUALALPHA 10 DAVE MODULE SERVICE MANUAL Issue 1 May 99
Setup Menu
In order to use the DAVE unit you may need to re-configure the inputs using the setup menu. The basic instructions for using the setup menu are set out below. For more details please consult the DAVE owners manual and the CR9000 remote handset owners manual.
ENTERING THE SETUP MENU USING THE CR9000 REMOTE CONTROL
N.B. The CR9000 must be in audio mode to control the
unit. Press the AUD button to enter this mode.
Press RESTORE followed within 2 seconds by MENU.
You can also use the front panel controls if preferred.
Hold down the MODE/ZONE button and whilst still holding it down press the CONFIRM button.
Either method will bring up a menu on the on screen display (OSD) on the TV or monitor connected to the MON OUT (Monitor Out) sockets of the Alpha 10 DAVE module and also on the front panel display of the Alpha 10 integrated amplifier.
The menus have up to seven options per page when displayed on the TV or monitor. The rectangular boxes below are
representations of the menus that will be displayed on your TV screen. The selected line of the menu will also be
displayed on the front panel display of the Alpha 10.
EXITING THE SETUP MENU
USING THE CR9000 REMOTE CONTROL
Press the MENU button at any time or highlight Exit + Save and press the RIGHT < button.
USING THE FRONT PANEL CONTROLS
Either
Press the front panel CONFIRM button at anytime from any menu.
Or` Go to the final page of menus and press the CONTROL button
until Exit + Save Off is displayed. Rotate the volume control so the display shows Exit + Save On.
Both the OSD and front panel display will then show “Settings Saved” for a couple of seconds to confirm this.
Your unit now has the settings stored in memory as "Favourite Settings". You can choose to trim the centre and surround levels to suit a particular movie, then restore the stored settings at any time by pressing FAVOURITE (RESTORE) on the remote.
NAVIGATING THE MENUS USING THE CR9000 REMOTE CONTROL
•
Use selection on the highlighted line, and to change menus pages when the menu heading is highlighted.
keys to go up/down the menu, =< keys to alter the
–
USING THE FRONT PANEL CONTROLS
To select a menu highlight it by moving the cursor using the front panel CONTROL button to step down through the choices To select a new page highlight the menu title and press CONTROL. To select a choice rotate the volume control one click at a time to cycle through the available choices.
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