Cambridge Audio 640C V2 Service Manual

Gallery Court Hankey Place London SE1 4BB UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
640C V2
Issue Date: 30
th
November 2005
Revised Date 1
st
Issue: 20
th
November 2006
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SERVICE MANUAL
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SPECIFICATIONS:
D/A Converter Dual Wolfson WM8740
24-Bit/192kHz capable
Filter 4 Pole Dual Differential
Double Virtual Earth balanced
Frequency Response (+/-0.1dB) 20Hz – 20kHz
THD @ 1Khz 0dBFs <0.0010%
THD @ 1Khz -10dBFs <0.0005%
THD @ 20Khz 0dBFs <0.0070%
IMD (19/20 kHz) 0dBFs <0.0008%
Linearity @ -90dBFs +/- 0.5dB
Stop band rejection (>24 kHz) > 90dB
S to N ration, A weighted >104dB
Total correlated jitter <160pS
Crosstalk @1kHz <-100dB
Crosstalk @20kHz <-99dB
Output impedance <50 ohms
Dimensions (H x W x D) 70 x 430 x 310 mm
Weight 4.6kg (10.1lbs)
AP19501/2
1

Cambridge Audio 640C V2 Specifications

General

Type	CD Player
DAC	Wolfson WM8740
Total Harmonic Distortion	< 0.002%
Digital Output	Coaxial
Dimensions (W x H x D)	430 x 80 x 300 mm
Weight	5.5kg
Signal-to-Noise Ratio	>110dB

Summary

Product Specifications

Technical Specifications

Detailed technical parameters of the Cambridge Audio 640C V2 CD Player.

Important Safety Precautions

Laser Safety Precautions

Laser Handling and Emission Checks

Procedures for safely handling laser components and performing emission checks.

Front Panel PCB

Front Panel Schematic

Electrical schematic diagram for the front panel control interface of the CD player.

Front Panel PCB Layout

Front Panel PCB Top Layer Layout

Visual representation of the component placement and routing on the top side of the front panel PCB.

Front Panel PCB Bottom Layout

Front Panel PCB Bottom Layer Layout

Visual representation of the component placement and routing on the bottom side of the front panel PCB.

Servo PCB

Servo PCB Schematic

Electrical schematic diagram for the servo control board of the CD player.

DAC PCB Schematic

DAC Board Schematic (Issue 6)

Electrical schematic diagram for the DAC (Digital-to-Analog Converter) board.

DAC PCB Schematic (Revision 7)

DAC Board Schematic (Revision 7)

Electrical schematic diagram for the DAC board, Revision 7.

Supply / Control Bus / Digital / Relay PCB

Supply / Control Bus / Digital / Relay PCB Schematic

Schematic diagram for the PCB handling power supply, control signals, digital interfaces, and relays.

Mains PCB

Mains PCB Schematic

Electrical schematic diagram for the mains input and filtering circuitry.

Voltage Select Switch PCB

Voltage Select Switch Schematic

Electrical schematic for the voltage selection switch circuitry.

IC Pin Layout Details

Front Panel PCB IC Pinouts