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Cyrus AV5 Service Manual
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Cyrus AV5 Service Manual

Digital preamplifier
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CYRUS AV5
DIGITAL PREAMPLIFIER

SERVICE MANUAL

SPECIFICATIONS

Multi-channel decoding systems
Dolby Digital, DTS, PCM linear
Analogue input sensitivity
2V // 47k?
Digital input sensitivity
500mV pk-pk // 75?
Output voltage
3.9V max all channels
Tape output voltage
2V max
Signal to noise ratio
-90dB Awtd vol @ max
-117dB Awtd vol @ -28dB to minimum
THD (Digital input)
0.005%
THD (Analogue input)
0.006%
Frequency response
3Hz to 20kHz
Dimensions (HxWxD)
73 x 215 x 360mm
Finish
Black

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Summary of Contents for Cyrus AV5

  • Page 1: Service Manual

    CYRUS AV5 DIGITAL PREAMPLIFIER SERVICE MANUAL SPECIFICATIONS Multi-channel decoding systems Dolby Digital, DTS, PCM linear Analogue input sensitivity 2V // 47k? Digital input sensitivity 500mV pk-pk // 75? Output voltage 3.9V max all channels Tape output voltage 2V max Signal to noise ratio...
  • Page 2 CYRUS AV5 SERVICE CAUTIONS These two symbols shown are displayed prominently on the Cyrus AV5 base cover label. 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.
  • Page 3 CYRUS AV5 TYPE IDENTIFICATION 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.
  • Page 4 CYRUS AV5 BLOCK DIAGRAM July 2000...
  • Page 5 CYRUS AV5 TECHNICAL DESCRIPTION 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 to an 8 way multiplexer IC404 which selects a digital input.
  • Page 6 (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 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.
  • Page 7 CYRUS AV5 TECHNICAL DESCRIPTION Microprocessor The microprocessor forms the interface between the user controls to the various circuit blocks. At power up and power down the processor is reset by IC1105. The amount of output lines is boosted by IC’s IC1205/6 adding an extra 16 control lines.
  • Page 8 CYRUS AV5 PCB COMPONENTS RESISTORS R101 SMD0805 330R MF 1/8W 1% R102 SMD0805 2.7k MF 1/8W 1% R103 SMD0805 MF 1/8W 1% R104 SMD0805 470R MF 1/8W 1% R105 SMD0805 100k MF 1/8W 1% R106 SMD0805 MF 1/8W 1% R107...
  • Page 9 CYRUS AV5 PCB COMPONENTS R434 SMD0805 2.2k MF 1/8W 1% July 2000...
  • Page 10 CYRUS AV5 PCB COMPONENTS R435 SMD0805 1.4k MF 1/8W 1% Was originally 2.2k. Reduced to improve input overload R440 SMD0805 2.2k MF 1/8W 1% R441 SMD0805 1.4k MF 1/8W 1% Was originally 2.2k. Reduced to improve input overload R446 SMD0805 2.2k...
  • Page 11 CYRUS AV5 PCB COMPONENTS R631 SMD0805 2.4k MF 1/8W 1% R632 SMD0805 2.4k MF 1/8W 1% R633 SMD0805 MF 1/8W 1% R634 SMD0805 MF 1/8W 1% R635 SMD0805 MF 1/8W 1% R636 SMD0805 MF 1/8W 1% R637 SMD0805 MF 1/8W 1%...
  • Page 12 CYRUS AV5 PCB COMPONENTS R807 SMD0805 100k MF 1/8W 1% R808 SMD0805 MF 1/8W 1% R809 SMD0805 MF 1/8W 1% R810 SMD0805 MF 1/8W 1% R811 SMD0805 MF 1/8W 1% R812 SMD0805 NOT FITTED R813 SMD0805 MF 1/8W 1% R814...
  • Page 13 CYRUS AV5 PCB COMPONENTS R1102 SMD0805 MF 1/8W 1% R1103 SMD0805 MF 1/8W 1% R1104 SMD0805 100k MF 1/8W 1% R1201 SMD0805 MF 1/8W 1% R1301 AXIAL0.5 MF 1/4W 5% R1302 SMD0805 MF 1/8W 1% R1303 SMD1206 3.3R MF 1/8W 1%...
  • Page 14 CYRUS AV5 PCB COMPONENTS RP1201 RES CAT16..4 4 off resistor pack RP1202 RES CAT16..4 4 off resistor pack RP1203 RES CAT16..4 4 off resistor pack RP1204 RES CAT16..4 4 off resistor pack RP1301 RES CAT16..4 4 off resistor pack RP1302 RES CAT16..4...
  • Page 15 CYRUS AV5 PCB COMPONENTS CAPACITORS C101 SMD0805 10nF CP 50V 10% C102 SMD0805 10nF CP 50V 10% C103 SMD0805 10nF CP 50V 10% C104 RB.3/.6 4700uF EL 16V 20% C105 RB.3/.6 4700uF EL 16V 20% C106 SMD0805 47nF CP 50V 10%...
  • Page 16 CYRUS AV5 PCB COMPONENTS C403 SMD0805 47nF CP 50V 10% C404 SMD0805 47nF CP 50V 10% C405 SMD0805 47nF CP 50V 10% C406 SMD0805 47nF CP 50V 10% C407 SMD0805 47nF CP 50V 10% C408 SMD0805 47nF CP 50V 10%...
  • Page 17 CYRUS AV5 PCB COMPONENTS C516 SMD0805 100pF CP 50V 10% C517 SMD0805 100pF CP 50V 10% C518 SMD0805 100pF CP 50V 10% C519 SMD0805 100pF CP 50V 10% C520 SMD0805 100pF CP 50V 10% C521 SMD0805 100pF CP 50V 10%...
  • Page 18 CYRUS AV5 PCB COMPONENTS C627 CAPSMD4.0 10uF EL 16V 20% C628 CAPSMD4.0 10uF EL 16V 20% C629 SMD0805 47nF CP 50V 10% C630 SMD0805 47nF CP 50V 10% C631 SMD0805 47nF CP 50V 10% C632 SMD0805 47nF CP 50V 10%...
  • Page 19 CYRUS AV5 PCB COMPONENTS C821 SMD0805 47nF CP 50V 10% C901 SMD0805 10nF CP 50V 10% C902 SMD0805 10nF CP 50V 10% C903 SMD0805 10nF CP 50V 10% C904 CAPSMD5.0 47uF EL 6.3V 20% C905 SMD0805 10nF CP 50V 10%...
  • Page 20 CYRUS AV5 PCB COMPONENTS C1206 SMD0805 47nF CP 50V 10% C1207 SMD0805 47nF CP 50V 10% C1208 SMD0805 47nF CP 50V 10% C1209 SMD0805 47nF CP 50V 10% C1210 SMD0805 47nF CP 50V 10% C1302 SMD0805 47nF CP 50V 10%...

  • Page 21: Voltage Regulators

    CYRUS AV5 PCB COMPONENTS T602 SOT-223 PZTA92 PNP 2W SMD transistor T701 SOT23 BC856BLT1 PNP Signal Transistor T702 SOT23 BC818-25 NPN Signal Transistor T703 SOT23 BC818-25 NPN Signal Transistor T704 SOT23 BC818-25 NPN Signal Transistor T705 SOT23 BC818-25 NPN Signal Transistor...
  • Page 22 CYRUS AV5 PCB COMPONENTS IC609 SOL-20 LM1973M 3 channel volume control IC801 SO-14 MM74LVX125M LV Quad Buffer IC802 PLCC44/SKT 44-pin PLCC socket IC803 SO-14 MM74LVX125M LV Quad Buffer IC804 SO-14 MC74HC74AD Dual D-type flip flop IC901 SO-16 74HC4094D 8 bit shift reg.
  • Page 23 CYRUS AV5 PCB COMPONENTS L401 COIL FSL 1.0u-FSL Fixed Inductor L402 COIL FSL 1.0u-FSL Fixed Inductor L403 COIL FSL 1.0u-FSL Fixed Inductor L404 COIL FSL 1.0u-FSL Fixed Inductor L501 COIL FSL 1.0u-FSL Fixed Inductor L502 COIL FSL 1.0u-FSL Fixed Inductor...
  • Page 24 256k bytes for Boot Code Gain = 6dB Gain = 6dB and Look-up table 27C020 Left CS4923, CS4925 or CS4926 PRELIMINARY DATA Right CS4226KQ DO NOT USE IN ANGER LRCLKN2,CMPREQ Compressed Data SCLKN2,CMPCLK Input Interface S/PDIF Receiver Left Surround DBCLK SDATAN2,CMPDAT,RCV958 Parallel or Serial Host Interface Voltage...
  • Page 25 Sheet Huntingdon, United Kingdom. Drawn date: 1-Apr-1999 Approved by: Digital Coaxial Inputs. Optical Coaxial Inputs and Analogue Inputs This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder Path: M:\IanS\temp\temp.ddb - Documents\SC011491.SCH...
  • Page 26 CRYSTAL multi-channel codec featuring: Drawn date: 1-Apr-1999 Approved by: 6 x 20-bit resolutiom DACs, 2 x 20-bit ADCs with attenuation This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder...
  • Page 27 Sheet Huntingdon, United Kingdom. DAC output filters, volume control and buffers. Drawn date: 9-Apr-1999 Approved by: This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder Path: M:\IanS\temp\temp.ddb - Documents\SC011691.SCH...
  • Page 28 Huntingdon, United Kingdom. Output sockets with TAPE muting Drawn date: 1-Apr-1999 Approved by: All outputs have silent clamps This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder Path: M:\IanS\temp\temp.ddb - Documents\SC011791.SCH...
  • Page 29 Sheet Huntingdon, United Kingdom. CRYSTAL audio decoder and signal processing DSP Drawn date: 1-Apr-1999 Approved by: This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder Path: M:\IanS\temp\temp.ddb - Documents\SC011891.SCH...
  • Page 30 Drawn by: Cummins/Sells Sheet Huntingdon, United Kingdom. CRYSTAL Decoder External Memory Drawn date: 1-Apr-1999 Approved by: This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder Path: M:\IanS\temp\temp.ddb - Documents\SC011991.SCH...
  • Page 31 Huntingdon, United Kingdom. Delay pulse generator with Drawn date: 1-Apr-1999 Approved by: ALS microphone amplifier + rectifier This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder Path: M:\IanS\temp\temp.ddb - Documents\SC011A91.SCH...
  • Page 32 Description: Issue: Drawn by: Cummins/Sells Sheet Huntingdon, United Kingdom. Host Micro-controller Drawn date: 1-Apr-1999 Approved by: This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder Path: M:\IanS\temp\temp.ddb - Documents\SC011B91.SCH...
  • Page 33 Sheet Huntingdon, United Kingdom. Host Micro-controller Address Decoding and Expansion Registers Drawn date: 1-Apr-1999 Approved by: This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder Path: M:\IanS\temp\temp.ddb - Documents\SC011C91.SCH...
  • Page 34 Cummins/Sells Sheet Huntingdon, United Kingdom. Host Micro-controller Front Panel Display Interface Drawn date: 1-Apr-1999 Approved by: This drawing is the intellectual property of Cyrus Electronics Ltd. Print date: 2-Apr-2008 File Name: Sheet Title: Digital AV Decoder Path: M:\IanS\temp\temp.ddb - Documents\SC011D91.SCH...