Service Manuals, User Guides, Schematic Diagrams or docs for : ARCAM P85 Arcam-P85-Service-Manual

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Service Manual          A85
                        Issue 2.0




DiVA A85, P85 & P85/3
Amplifiers




                                    ARCAM
                       Contents List




!   Contents list


!   Circuit description


!   Service guide


!   Circuit diagrams


!   Component overlays


!   Circuit board parts list


!   General assembly parts list
Pre-amplifier circuit description                                         The digital pots Z108D and Z108A control the bass and treble
                                                                          respectively. This is done by moving the wiper connected to the
                                                                          frequency-sensitive impedance between the non-inverting and
                                                                          inverting terminals of Z112A, effectively changing the ratio of
The A85 preamplifier is a high-performance, DC coupled design             feedback boost and feed-forward attenuation of the circuit at the
with microprocessor control of input select, two independent tape         desired frequencies, thus providing a EQ gain control that is
loops, electronic volume control, tone bypass and electronic tone         symmetrical on a logarithmic scale, with the use of a linear pot.
control.
                                                                          Z112B provides the 6dB of gain necessary to bring the nominal
It features a discrete power supply and low-noise linear circuitry to     signal level back to unity. C116 and C117 remove the 2.5VDC
obtain very good distortion and noise performance, suitable for           offset from the output, to prevent clunks when the tone controls
high quality source material such as CD or DVD-A.                         are activated.

                                                                          Z108 is controlled by a simple 3-wire serial interface from the
Input switching                                                           microprocessor. Each of the digital lines has its own ground return
                                                                          to minimise electromagnetic interference. They are connected
Each of the inputs has a pair of diodes to the 

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