Cambridgeaudio ap 25144 dac service manual
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CAMBRIDGE AUDIO AZUR DACMAGIC SERVICE MANUAL TABLE OF CONTENTS Specifications 1 Table of Contents 2 Front Panel Details 3 Rear Panel Connections 4 Safety Instructions 5 ‐ 6 Exploded Diagram 7 Bill of Materials 8 ‐ 10 Main PCB – SPDIF I/O, ABUS, RS232 11 Main PCB – DSP, DIR, DIT 12 Main PCB – DAC 13 Main PCB – DAC (Power Supply) 14 Front Panel (Control) LED and Mute 15 2
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Rear panel connections 1. Unbalanced Audio Outputs Single-ended conventional stereo outputs for connection to the line-level phono/RCA inputs of an amplifier. 2. Balanced Audio Outputs The DacMagic also features true balanced (XLR) outputs. This is a higher quality output that can reject noise and interference with equipment with balanced inputs. These balanced outputs are ideally suited for connection to the Cambridge Audio 840A or 840E amplifiers. XLR connectors should be wired as follows: Pin 1 – Ground; Pin 2 – Hot (in-phase); Pin 3 – Cold (phase-inverted). 3. Digital Outputs The digital outputs allow a digital recording device to be connected. These outputs loop or pass-through unprocessed digital audio from the selected digital input. Two types are available (both the co-axial and the optical are active concurrently and can be used to connect and run equipment at the same time): S/P DIF co-axial – to obtain best results, use a high quality 75 ohm digital RCA interconnect cable (not one designed for normal audio use). TOSLINK optical – use a high quality TOSLINK fibre-optic interconnect cable designed specifically for audio use. Note: These outputs are pass-through only; there is no upsampling or any other modification done to the LPCM input signal. 4. & 5. Digital Inputs 1 and 2 The DacMagic is fitted with two sets of digital inputs which enable the connection of source components. Each input has both S/P DIF and TOSLINK types fitted. Only one of the two types for each input should be connected at any one time. If both the optical and co-axial inputs have connections made to them (e ven if only one is attempting to function), neither will work. S/P DIF co-axial – to obtain best results, use a high quality 75 ohm digital RCA interconnect cable (not one designed for normal audio use). TOSLINK optical – use a high quality TOSLINK fibre-optic interconnect cable designed specifically for audio use. Note: This unit only accepts two-channel LPCM di gital audio (e.g. Dolby Digital 2.0). You cannot connect a Dolby Digital 5.1 or a DTS signal as they will not be recognised. If you wish to connect a DVD or similar device, please ensure that the sound output of your player is set to two-channel PCM. 6. USB In USB Type B input allowing direct connection to a PC via a Type B to Type A USB lead. The DacMagics operation is independent of your PC soundcard – it will operate whether your PC has a soundcard or not. 7. AC 12V 1.5A Power Adaptor Socket Once you have completed all connections, plug the supplied power adaptor into the DacMagic. Important Note: Use the supplied power supply unit ONLY. Rear Panel Connections 3