Table of Contents
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351A
Specifications
Power Output:
Weight:
THD (unweighted):
Inputs:
Outputs:
USB
Frequency Response:
S/N ratio (ref 1w):
Input Impedance:
Max. Power Consumption:
Bass/Treble controls:
Dimensions (H x W x D):
Service Manual
45 watts (into 8 ohms)
6kg (13.2lbs)
<0.02% @ 1kHz, 80% of rated power
<0.15% 20Hz - 20kHz, 80% of rated power
5 x RCA, 1 x USB (type B), 1 x 3.5mm MP3 input
Speakers A & B, 1 x Rec Out, ¼'' headphone out,
USB audio 1.0
16-bit 32kHz, 44.1kHz, 48kHz
5Hz – 50kHz
>92dB (unweighted)
47k ohms
320W
Shelving, ultimate boost/cut
+/-10dB @ 20Hz and +/-6dB @ 20kHz
86 x 430 x 340mm (3.4 x 16.9 x 13.4'')
Issue date: July 2012
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Table of Contents
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Summary of Contents for Cambridge Audio 351A
- Page 1 Issue date: July 2012 Service Manual 351A Specifications Power Output: 45 watts (into 8 ohms) Weight: 6kg (13.2lbs) THD (unweighted): <0.02% @ 1kHz, 80% of rated power <0.15% 20Hz - 20kHz, 80% of rated power Inputs: 5 x RCA, 1 x USB (type B), 1 x 3.5mm MP3 input Outputs: Speakers A &...
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Page 2: Table Of Contents
Contents Important safety instructions Important safety instructions ..............2 For your own safety please read the following important safety instructions carefully before attempting to connect this unit to the mains Rear panel connections ................4 power supply. They will also enable you to get the best performance from Front panel controls ..................5 and prolong the life of the unit: 1. - Page 3 EC) Directives when used and installed according to this instruction The unit should be operated only from the type of power source indicated manual. For continued compliance only Cambridge Audio accessories should be used with this product and servicing must be referred to on the marking label.
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Page 4: Rear Panel Connections
USB interface Connecting a turntable A USB B type socket is fitted to the 351A to enable the playback of If it is desired to connect a turntable without a built-in phono stage, an external phono stage such as our 551P or 651P models should be used. -
Page 5: Front Panel Controls
Service Manual 351A Front panel controls Volume azur 351A Integrated Amplifier Bass Treble Balance On / Off MP3 In Phones Speaker B Direct Power On/Off sound. In the central position these controls have no effect. They only modify the sound through your loudspeakers and do not affect the Switches the unit on or off. -
Page 6: Remote Control
Remote control The 351A is supplied with an Azur Navigator remote Information control that operates both this amplifier and Cambridge Used with CDs that support CD-text. In stop mode, press to Audio Azur range CD players. Insert the supplied AAA toggle between album name and total time on the display. -
Page 7: Connections
Service Manual 351A Connections Loudspeakers Check the impedance of your speakers. When using a pair of speakers, you can use types with an impedance of between 4 and 8 Ohms. The red coloured speaker terminals are positive (+) and the black speaker terminals are negative (-). - Page 8 USB audio connections The diagram below shows how to connect the amplifier to a personal The 351A also works with most distributions of Linux using the native Audio 1.0 driver. Because Linux distributions vary according to their computer via USB connection. Connect a USB ‘A-B’ type lead from the 351A USB input to one of the USB ports on the PC.
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Page 9: Technical Specifications
Service Manual 351A Technical specifications Troubleshooting There is no power Power output 45 watts (into 8Ω) THD(unweighted) <0.02% @ 1kHz, 80% of rated power Ensure the AC power cord is connected securely. <0.15% 20Hz - 20kHz, 80% of rated power Ensure the plug is fully inserted into the wall socket and is switched on. -
Page 10: Packaging Exploded Diagram
Packaging exploded diagram Drawing ref Part Description number PDA019 Remote control Front panel exploded diagram Drawing ref Part Description number PY1764 Front panel PCB... -
Page 11: Unit Exploded Diagram
Service Manual 351A Unit exploded diagram Drawing ref Part Description numbers PY1758 Wrapover lid black colour PY1760 Wrapover lid silver colour PY1766 Toroid transformer 115V to 230V PDA015 USB input PCBA PDA014 Amplifier PCBA PY1762 Volume board PZ725 Front panel black colour... -
Page 12: Main Pcb Schematics - Tone Circuit
Main PCB Schematics - Tone Circuit... -
Page 13: Main Pcb Schematics - Power Amps
Service Manual 351A Main PCB Schematics - Power Amps... -
Page 14: Main Pcb Schematics - Power Supply
Main PCB Schematics - Power Supply... -
Page 15: Main Pcb Schematics - Ipod Stage
Service Manual 351A Main PCB Schematics - iPod Stage... -
Page 16: Main Pcb Gerbers
Main PCB Gerbers... - Page 17 Service Manual 351A Main PCB Gerbers ...
- Page 18 Main PCB Gerbers...
- Page 19 Service Manual 351A Main PCB Gerbers...
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Page 20: Main Pcb Bom
Main PCB BOM RESISTORS Value Description/Type Component ManPN Tolerance PackageInfo AP Numbers Ident 2W Metal Film R48, R67 20mm Pitch 2W Metal Film R56, R68 20mm Pitch 2W Metal Film 20mm Pitch 100R 1/4W Metal Film 10mm Pitch 220R 3W Metal Film R61, R63 22.5mm Pitch 220R... - Page 21 Service Manual 351A CAPACITORS Value Description/Type Component ManPN Tolerance PackageInfo AP Numbers Ident No Fit C23, C39 NO FIT C73, C74 10pF 50V NP0 Ceramic C9, C15, C58, 2.5mm Pitch C59, C79, C81 33pF 50V NP0 Ceramic C12, C13, C71, 2.5mm Pitch...
- Page 22 Main PCB BOM CONNECTORS Value Description/Type Component ManPN Tolerance PackageInfo AP Numbers Ident Stereo 6.35mm Headphone Jack CK-6.35-08A Through Hole PY646 8 Way Loudspeaker WP8-22 Red top/ Black PY1322 Lower 3 Pin IEC Socket SS-7B-1 PCB Mount 4 Way Gold Plated Phono CN4, CN5, CN8 AV4-8.4-9 Red-Bottom,...
- Page 23 Service Manual 351A SWITCHES Value Description/Type Component ManPN Tolerance PackageInfo AP Numbers Ident 2P2T Pushbutton Switch SW1, SW2 PBS-22H01-T18-SL PY645 Mains Rated Power Switch KDA-A04-10 TRANSISTORS Value Description/Type Component ManPN Tolerance PackageInfo AP Numbers Ident -45V 500mA PNP Signal Q1, Q4...
- Page 24 VOLUME CONTROL MOTOR VIEWED FROM REAR Volume Control PCB BOM RESISTORS VARIABLE GENERAL NOTES DRAWING TITLE DRAWN BY Rev 3 change: CN1 connector changed to CA2 solder-in cable assembly 350A & 351A Volume PCB tnership SHEET TITLE DATE Value Description/Type Component ManPN...
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Page 25: Microcontroller Pcb Schematics
Service Manual 351A Microcontroller PCB Schematics Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally. -
Page 26: Microcontroller Gerbers
Microcontroller Gerbers Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally. -
Page 27: Microcontroller Pcb Bom
H9 2.54mm 90 Right-angle connector 9-way H2 2.54mm 90 Right-angle connector 2-way H3 2.54mm 90 Right-angle connector 3-way NO FIT Azur 340A IR PCB cable NO FIT FOR 350A/351A PRODUCT SWITCH Value Description/Type Component Ident AP Numbers 2400-020200- Tactile Switch... -
Page 28: Usb Pcb Schematic
USB PCB Schematic Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally. -
Page 29: Usb Pcb Gerber
Service Manual 351A USB PCB Gerber Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally. -
Page 30: Usb Pcb Bom
USB PCB BOM RESISTORS Value Description/Type Component ManPN Tolerance PackageInfo AP Number Ident 0603 Thick Film R14, R25 0603 No Fit R26, R36 0603 Thick Film R15, R16 0603 0603 Thick Film R1, R2, R6, 0603 R7, R12, R13 330R 0603 Thick Film R8, R9, R35 0603... - Page 31 Service Manual 351A CONNECTORS Value Description/Type Component ManPN Tolerance PackageInfo AP Number Ident USB B Type USB B Type 90˚ Through Hole 6 Way Cable Assembly - AP30766/X 2.5mm Pitch Straight Header CRYSTALS Value Description/Type Component ManPN Tolerance PackageInfo AP Number...
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Page 32: Ic Details
Cambridge Audio 350A Service Manual IC details Front Panel PCB PIC16F72-I/SP (U1) BA6218 (U2) TSOP1836/37 (U3) Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally. - Page 33 Service Manual 351A Cambridge Audio 350A Service Manual Main PCB NE5532 (U1 & U2) TC9163AF (U4) LM3886T (U6 & U7) Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally.