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Cambridge Audio 840A User Manual

Cambridge Audio 840A
63 pages
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Gallery Court Hankey Place London SE1 4BB UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
840A
Issue Date: 16th June 2006
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SERVICE MANUAL
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SPECIFICATIONS:
Power Output 120W RMS into 8 Ohms
200W RMS into 4 Ohms
THD (unweighted) < 0.0015% 1 kHz
at 80% of rated power
< 0.015% 20Hz 20kHz
at 80% of rated power
Frequency Response 10Hz 50kHz +/- 1dB
S/N ratio (ref 1W/8 Ohm) >83dB
Input Impedances Input 1 (balanced) 10 kOhm
Inputs 2-7 68 kOhm
Tape Input 68 kOhm
Power Amp damping factor > 110 at 1kHz
Max power consumption 800W
Minimum power consumption Active (no signal) 70W
Standby 7W
Bass & Treble controls Shelving type
Max bass boost/cut +/- 10dB at 10Hz
Max treble boost/cut +/- 7.5dB at 20Hz
Dimensions (H x W x D) 115 x 430 x 385mm
(4.5 x 16.9 x 15.2”)
Weight 15.0kg (33Lbs)
AP19597/1
1
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Cambridge Audio 840A Specifications

General IconGeneral
Frequency Response10Hz - 50kHz ±1dB
Input Impedance47k Ohms
Power Output120W per channel into 8 Ohms
Total Harmonic Distortion<0.001% (1kHz, 80% of rated power)
Dimensions115 x 430 x 385 mm (4.5 x 16.9 x 15.2 inches)
Damping Factor>100
Signal to Noise Ratio>93dB (unweighted)

Summary

Product Specifications

Power Output

Details the amplifier's power output in Ohms.

THD (unweighted)

Specifies total harmonic distortion at 80% of rated power.

Frequency Response

Lists the frequency range and deviation.

S/N ratio (ref IW/8 Ohm)

Indicates the signal-to-noise ratio.

Input Impedances

Details impedance for different inputs.

Power Amp damping factor

Specifies the damping factor.

Max power consumption

Indicates maximum power draw.

Minimum power consumption

Specifies power draw when idle or in standby.

Bass & Treble controls

Describes the type and range of tone controls.

Dimensions (H x W x D)

Provides the physical dimensions of the unit.

Weight

States the product's weight.

Safety Precautions

General Safety Warnings

Covers warnings for electrical shock, servicing, and component handling.

Component Replacement Notes

Provides guidance on replacing components like tantalum capacitors.

System Diagrams and Assembly

Block Diagram

Illustrates the overall signal flow and component connections.

Exploded Diagram

Visual representation of product components.

Exploded Diagram Parts List

Detailed list of components shown in the exploded diagram.

Front Panel PCB

Front Panel PCB Schematics

Circuit diagrams for microcontroller, LCD, and shift registers.

Front Panel PCB Layouts

Physical layouts of the top and bottom sides.

Front Panel PCB BOM

Bill of Materials for the front panel PCB.

Input PCB

Input PCB Schematics

Circuit diagrams for input selection, control, and amplifier.

Input PCB Layouts

Physical layouts of the top and bottom sides.

Input PCB BOM

Bill of Materials for the input PCB.

Preamp PCB

Preamp PCB Schematics

Circuit diagrams for relay logic, tone control, and post amp.

Preamp PCB Layouts

Physical layouts of the top and bottom sides.

Preamp PCB BOM

Bill of Materials for the preamp PCB.

Power Amplifier Right PCB

Power Amplifier Right Schematics

Circuit diagrams for power supplies and right channel.

Power Amplifier Right PCB Layouts

Physical layouts of the top and bottom sides.

Power Amplifier Right PCB BOM

Bill of Materials for the right power amp PCB.

Power Amplifier Left PCB

Power Amplifier Left Schematics

Circuit diagrams for the left channel amplifier and power supplies.

Power Amplifier Left PCB Layouts

Physical layouts of the top and bottom sides.

Power Amplifier Left PCB BOM

Bill of Materials for the left power amp PCB.

Hub PCB

Hub PCB Schematics

Circuit diagram for the Hub PCB.

Hub PCB Layouts

Physical layouts of the top and bottom panels.

Hub Board BOM

Bill of Materials for the Hub board.

Rectifier PCB

Rectifier PCB Schematics

Circuit diagram for the Rectifier PCB.

Rectifier PCB Layouts

Physical layouts of the top and bottom sides.

Rectifier PCB BOM

Bill of Materials for the Rectifier PCB.

IC Pin Layout Details

Common IC Pinouts

Pinouts for frequently used integrated circuits.

Microcontroller and Driver ICs

Pinouts for PIC and ULN2003A devices.

Technical Description

Power Supply PCB Description

Details the functions and components of the Power Supply PCB.

Front Panel PCB Description

Details the main PIC, controls, and interfaces.

Input PCB Description

Outlines the functions of the Input PCB.

Preamplifier PCB Description

Lists components and functions of the Preamp PCB.

Power Amplifier PCB Description

Describes amplifier stages, protection, and ancillary functions.

Hub PCB Description

Describes the functions of the Hub board and its microcontroller.

Rectifier PCB Description

Explains the components and purpose of the Rectifier PCB.

Software Loading Instructions

Software Loading Procedure

Step-by-step guide to load software onto the amplifier.

File Loading and Download

Instructions for loading the firmware file and downloading code.

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