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640C SERVICE MANUAL
TABLE OF CONTENTS
Safety Precautions & Important Notes
3
Laser Safety Precautions
4
Exploded Assembly Diagram
5
Main Assembly BOM (Silver Unit)
6-8
Front Panel PCB Schematic
9
Front Panel PCB Layout (Top Side)
10
Front Panel PCB Layout (Bottom Side)
11
Front Panel PCB BOM (Silver Unit)
12/13
Servo PCB Schematic
14
Servo PCB Schematic (Power Supply)
15
Servo PCB Layout (Top Side)
16
Servo PCB Layout (Bottom Side)
17
Servo PCB BOM
18/19
DAC PCB Schematic
20
DAC PCB Layout (Top Side)
21
DAC PCB Layout (Bottom Side)
22
DAC PCB BOM
23
Mains Input PCB Schematic
24
Mains Input PCB Layout (Top Side)
25
Mains Input PCB Layout (Bottom Side)
26
Mains Input PCB BOM
27
IC Pin Layout Details
28-33
Silver / Black Differences BOM
34
2
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SAFETY PRECAUTIONS & IMPORTANT NOTES
1.Check that the rear of the product indicates the correct supply voltage
for you area.
2. The lighting flash with the arrowhead within an equilateral
triangle is intended to alert the user or service agent to the
presence of dangerous voltages within the product enclosure
that may be of sufficient magnitude to constitute a risk of
electric shock to persons.
3. The exclamation point within an equilateral triangle is
intended to alert the user or service agent to the presence of
important operating and maintenance (Servicing) instructions
in the literature accompanying the appliance.
4. This product complies with EEC Low Voltage (73/23/EEC) and
Electromagnetic Compatibility (89/336/EEC) Directives when used and
serviced in accordance with this manual. For continued compliance all
components marked safety and EMC critical must only be replaced by
Cambridge Audio approved parts.
5. Any unauthorised design alterations or additions will void the
manufacturers warranty; furthermore the manufacturer cannot accept
responsibility for personal injury or property damage resulting therefrom.
6. When servicing, care should be taken to observe the original routing
and dressing of the leads and it should be confirmed that they have been
returned to normal after re-assembly.
Notes on chip component replacement
Never reuse a component that has been removed from a PCB
Notice that the minus side of a tantalum capacitor may be damaged by heat
COPYRIGHT NOTICE.
© 2005 Audio Partnership PLC. All rights reserved.
Cambridge Audio and Azur are registered trademarks of Audio Partnership PLC. This document
may not be reproduced, distributed, transmitted, displayed, published, or broadcast without the
express written prior permission of Audio Partnership PLC.
Alteration or removal of any trademark, copyright, or other notice from this content is prohibited.
Information provided in this document is provided solely for the use of official service agents in
repairing and servicing Audio Partnership PLC products.
