CAMBRIDGE AUDIO 840A MANUAL PDF

Quick Links. Table of Contents. Issue Date: 16th June All rights reserved. This document may not be reproduced, distributed, transmitted, displayed, published, or broadcast without the express written prior permission of Audio Partnership PLC. Page 53 The relays on the other PCBs are controlled by a set of shift registers that convert serial data from the PIC into 32 latched outputs.

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Quick Links. Table of Contents. Issue Date: 16th June All rights reserved. This document may not be reproduced, distributed, transmitted, displayed, published, or broadcast without the express written prior permission of Audio Partnership PLC. Page 53 The relays on the other PCBs are controlled by a set of shift registers that convert serial data from the PIC into 32 latched outputs.

Four shift registers U3,U4,U5,U6 are connected so that the serial input enters the first register and is clocked through and out of its serial output into the serial input of the second register.

The balance control operates in discrete steps selected by relays. Page 56 The XD control circuit is a differential pair of transistors with one input grounded and the other driven by the main amplifier output voltage, scaled down appropriately by R63, R The drive to the displacer is taken from collector load R58, to give the required phase inversion.

R59 is present simply to equalise the dissipation in the differential pair transistors to maintain their balance. Page 57 Clip detection. When it is enabled, the clip-detect system turns down the volume when excess clipping of either amplifier output occurs. Very brief episodes of clipping are ignored. The volume stays reduced and does not ramp back up in the absence of clipping. The clip detect system is based on Q23, Q24 and associated components. Page 58 Control Hub input switcher from IR commands Send input select data to main PIC Control Hub input switcher to prevent thumps on A output Control A-bus status line IR commands to the A-bus keypads are sent to the hub so that the required input can be selected and external equipment controlled.

Page 60 To rename inputs: Press and hold the relevant input select button. Letters in the name are selected by turning the volume knob. To access the configuration menu: Press and hold the Mode button. Print page 1 Print document 63 pages. Cancel Delete. Sign In OR. Don't have an account? Sign up! Restore password. Upload from disk. Upload from URL.

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Cambridge Audio Azur 840A

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Cambridge Audio 840A Users Manual AP186462 Azur User's Cover Print CMYK.qxp

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