Cyrus 6 DAC delivers 40W continuous power into 8 . Cyrus 8 DAC delivers 70W continuous power into 8 . The Qx high performance digital variant, the Cyrus 8 Qx DAC, adds an upgraded D/A converter module to the digital stage of the Cyrus 8 DAC. The Cyrus 8 DAC and Cyrus 8 Qx DAC include connection for a PSX‐R upgrade power supply. The power feed from the regulated PSX‐R is fed to the preamplifier stages. Model upgrades The Cyrus factory offers owners the opportunity to upgrade to a higher specification model. Some of these upgrades may be available as kits to enable a Cyrus authorised service agent to perform the upgrade. In these cases detailed instructions and kits of original parts will be available from the Cyrus service department. ...
This will be either 230V For use on nominal 220V ‐ 240V AC mains supply. 115V For use on nominal 110V ‐ 120V AC mains supply. Power consumption The maximum power consumption figure is indicated. Changing the supply voltage rating It is possible to change the supply voltage rating of an amplifier between 115V and 230V settings. The following additional parts will be required from the Cyrus parts department – Main power transformer of the correct rating. Mains fuse of the correct rating. Rating label that indicates the new supply voltage. Power cord with the correct termination. Replacement speaker sockets (4mm for 115V operation, BFA for 230V operation). ...
SMD COMPONENT REPLACEMENT Handling SMD resistors and capacitors are widely used in the Cyrus range of products. When handling SMD components, certain precautions should be observed‐ Handling SMD resistors and capacitors Always store SMD components in their original packaging or in a cool dry environment. Always handle SMD resistors and capacitors with tweezers or a vacuum pencil. Never handle SMD resistors and capacitors with fingers. Hold the SMD component by the body, not by the ends. Do not use SMD resistors or capacitors if the ends are dirty or discoloured. Do not use SMD resistors or capacitors if they have been dropped on the floor‐ they may be internally damaged. Always use replacement components of the correct size and shape. SMD components are available in many different packages. Where possible, order original parts from Cyrus. Handling SMD ICs Always store these components in their original packaging or in a cool dry environment. Always handle SMD transistors and ICs with tweezers or a vacuum pencil. Never handle SMD transistors and ICs with fingers. Ensure that the connection pins of larger multi‐pin ICs are not deformed or damaged ...
USB type socket, the power supply for IC601 is powered down, stopping the clock for IC601. When enabled, and with a USB audio signal connected, IC601 will re‐format the audio signal to IEC958/SPDIF format which is routed to IC701, the digital input switch. The I S audio data from the input switch IC701 is fed to IC801, a stereo D/A Converter. The D/A Converter converts the digital audio into an analogue output. This is amplified and filtered by IC802 before being passed to the DIG input of IC101 (the input switch on the main analogue amplifier PCB) via CON100. The digital audio signals from IC801 are also fed to the Qx DAC upgrade connector CON902. If a Qx upgrade DAC is fitted to a Cyrus 8 DAC, a flexfoil cable is fitted between CON902 and the Qx DAC PCB to connect digital audio and power etc to the Qx DAC. The audio output of the Qx DAC is connected to CON100 on the main PCB. In this configuration, the audio output cable of the Digital Input module is connected to a spare connector CON905. The power for the digital input PCB is supplied from a separate low voltage winding of the main power transformer. This is then rectified and sub regulated to a number of individual supplies, one 3.3V and two 5.0V. The rectified and unregulated supply is also passed directly to the main analogue amplifier PCB to provide power for the LCD backlight. The 15V power supplies for the analogue post DAC filter are provided from the main analogue amplifier PCB. When the amplifier is set to standby the power to the whole digital input PCB is removed. ...
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Power for the display backlight and the digital input PCB is provided separately from a low voltage winding of the main power transformer. The power supplies for the main amplifier (VCC) are 42V (Cyrus 8 DAC) or 39V (Cyrus 6 DAC). These are protected by fast blow fuses FS401 and FS402 on the main PCB. In addition a regulated 42V is derived from a charge pump circuit and supplies the low current section of the power amplifiers. A regulated power supply of 15V is derived from the power supply for the main amplifier via regulators VR402 and VR403. The 15V supplies are used for the input ...
This fault‐finding guide is not exhaustive, but should help a competent engineer trace faults within the amplifier. If you require more technical help than this guide, contact the Cyrus Service Department. CAUTION The high‐efficiency heat‐transfer insulation pads fitted between the power amplifier output ...
USE WITH A PSX‐R Use with a PSX‐R When a PSX‐R power supply is connected to a Cyrus 8 DAC, the presence of power as the PSX‐R is switched from standby automatically disconnects the feed from the internal power supply to the preamplifier regulators (via switch transistors T406/T402). The power from the PSX‐R is then fed to the preamplifier regulators via D451/D454. No modification is necessary to the amplifier for use with a PSX‐R, it may be connected without any changes to the amplifier. The connections between the amplifier and PSX‐R function as follows‐ Pin 1 (Standby) This is an output from the amplifier to send a standby control message (logic 1, +5V) to the ...
DC OFFSET ADJUSTMENT DC offset adjustment (no signal condition) The DC offset adjustment sets the DC voltage at the speaker output terminals. DC offset should always be checked as a matter of routine when an amplifier is returned for repair, whether the power amplifier section has required repair or not. The following procedure should be followed exactly to set the DC offset voltage to the correct value. If the DC offset voltage will not set correctly, this may indicate a power amplifier fault. Switch off the power to the amplifier. Disconnect all loudspeakers or dummy loads. Connect a DVM set to read mV to the left loudspeaker terminals (a short cable terminated with Cyrus speaker connectors is recommended to make certain contact with the terminals). Switch on the power to the amplifier, and bring it out of standby. Set the volume level to ‐ 15dB. Leave the amplifier to settle for 5 minutes. Check the voltage reading on the DVM. A voltage within the range 0V 50mV is acceptable and will not require any adjustment. If the voltage is outside of these limits, adjust RV203 to set the left channel offset within the range 0V 50mV. Connect the DVM to the right channel. Repeat the voltage check to the same limits and adjust RV204 to correct the right channel offset if necessary. ...
MC‐BUS OPERATION MC‐BUS MC‐BUS is a system which provides communication between the control systems of a number of Cyrus products. The communication takes the form of a serial data stream which is sent from a 'master' product and received and repeated by 'slave' products. The data is thus passed from one product to another around a loop. The master product should then receive the message back which confirms that loop connections have been correctly made. Cyrus ...
CIRCUIT DIAGRAMS Circuit diagram index The Cyrus 6 DAC and Cyrus 8 DAC circuit diagrams are listed below. Main PCB Input selector and volume control ........ 4 0 Power amplifier and DC servo .......... 4 1 Power amp regulator and standby control ...... 4 2 Main PCB power supplies, protection logic ...... 4 3 MC‐BUS, main PCB connectors .......... 4 4 Sub PCB USB decoder ................. 4 5 ...
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