User manual CAMBRIDGE AUDIO AZUR 351A SERVICE MANUAL

[. . . ] 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 5 x RCA, 1 x USB (type B), 1 x 3. 5mm MP3 input Speakers A & B, 1 x Rec Out, ¼’’ headphone out, Inputs: Outputs: USB USB audio 1. 0 16-bit 32kHz, 44. 1kHz, 48kHz Frequency Response: S/N ratio (ref 1w): Input Impedance: Bass/Treble controls: 5Hz – 50kHz >92dB (unweighted) 47k ohms 320W Shelving, ultimate boost/cut 86 x 430 x 340mm (3. 4 x 16. 9 x 13. 4’’) Max. Power Consumption: +/-10dB @ 20Hz and +/-6dB @ 20kHz Dimensions (H x W x D): Contents Important safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Rear panel connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Front panel controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Remote control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Technical specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Packaging exploded diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Front panel exploded diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Unit exploded diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] It is possible for the sound quality to be affected if the screw terminals are loose. The use of A and B speakers affords you an easy and inexpensive way to create a simple multi-room system. Note: When using two pairs of speakers, use speakers with a nominal impedance of 8ohms. 4 Always turn the Volume to minimum, switch to another input or turn the 351A off before plugging/unplugging cables to the USB input or whilst booting up/shutting down your PC/Mac. Mains voltage selector switch 4 B Right Left A Right 6 Mains Voltage Selector Switch: 115V/220-230V AC~50/60Hz 4 Power AC Left Right 5 Service Manual Front panel controls Volume 351A Integrated Amplifier Bass Treble Balance azur 351A On / Off MP3 In Phones Speaker B Direct S1 S2 S3 S4 S5 USB 1 2 3 4 5 6 7 8 9 10 11 1 Power On/Off MP3 Input Switches the unit on or off. 2 This source input allows you to connect a portable audio device such as an MP3 player, plugged into either the rear panel Phono/RCA input pair (labelled ‘S1’) or the front panel 3. 5mm stereo-jack input (labelled ‘MP3 In’). Press the S1 button on the front panel to select the input, or insert a device into the front panel socket which automatically selects the input and overrides the rear Phono/RCA sockets. 3 sound. In the central position these controls have no effect. They only modify the sound through your loudspeakers and do not affect the signals sent through the Rec Out connections. With a well-produced CD and a good system, the tone controls are unnecessary and can be switched out by the ‘Direct’ switch. If the musical recording is of poor quality or other factors are affecting the sound quality, it may be necessary to adjust the tone controls to compensate. 7 Infrared sensor Receives IR commands from the supplied Azur remote control. A clear, unobstructed line of sight between the remote control and the sensor is required. 8 Phones Volume Allows for the connection of headphones with a ¼” jack plug connector. Headphones with an impedance of between 32 and 600 ohms are recommended. When the headphones are connected, the output to the loudspeakers is switched off. 4 Use to increase or decrease the level of the sound from the outputs of the amplifier. This control affects the level of the loudspeaker output, the preamp output and the headphone output. It does not affect the Rec Out connections. It is advisable to turn the Volume control fully anticlockwise before switching the amplifier on. 9 Speaker B Turns on/off the secondary set of loudspeaker terminals on the back panel. This can be used for listening to an extra set of loudspeakers in another room. Please note that care should be taken when selecting if two loudspeakers are going to be used on each channel. If the combined resistance measured on the loudspeaker terminals is too low the amplifier may not switch out of Standby mode until a suitable load resistance is detected. Note: When using two pairs of speakers, use speakers with a nominal impedance of between 6-8 ohms each. 5 Balance This control allows you to adjust the relative output levels of the left and right channels. In the central position the output from each channel is equal. This control only modifies the sound through your loudspeakers – it does not affect the signals sent through the Rec Out connections. 10 S1-S5 Source inputs Direct Push the appropriate input selection button to select the source component that you wish to listen to. The signal selected is also fed to the Rec Out sockets so that it may be recorded. The input should not be changed whilst recording. 11 This control gives the audio signal a more direct path to the power amplifier stage of your amplifier, bypassing the bass and treble control circuits for the purest possible sound quality. 6 USB This source input allows connection of a personal computer via USB. Bass and Treble These controls allow subtle adjustments to the tonal balance of the 5 Remote control The 351A is supplied with an Azur Navigator remote control that operates both this amplifier and Cambridge Audio Azur range CD players. [. . . ] Polyester 47nF 63V 1uH Ferrite Main PCB Schematics - iPod Stage 2 FB1 C97 R88 1/4W Metal Film 3k9 62k 1/4W Metal Film 1/4W Metal Film 100k 470pF 50V NP0 Ceramic 1 2 3 4 5 6 6 Way Cable Assembly 3 1 2 3 4 GND 5 6 SHIELD 6 R97 R89 1uH Ferrite On 24AWG Wire 7 1/4W Metal Film 100k C82 CRX-3. 5-07 HP 3. 5mm Headphone Jack 1 220pF 50V NP0 Ceramic R96 10pF 50V NP0 Ceramic R CH IN C77 C79 FIT ONLY FOR 340A LK6 No Fit 1/4W Metal Film 100k 220pF 50V NP0 Ceramic GND_IPOD INPUT BUFFER +24dB LK1 24 AWG 10mm Pitch 7 8 RL2:C 6 ME11-012-2Z4 2P2T Relay LK24 LK28 LK40 24 AWG 24 AWG 24 AWG 10mm Pitch 10mm Pitch 10mm Pitch R SEL OUT R90 5 7 6 1/4W Metal Film 1k 10uF 35V NP Electrolytic C80 LK11 U3:B NE5532P Audio Op Amp 24 AWG 10mm Pitch LK8 24 AWG 10mm Pitch R91 100k 1/4W Metal Film C96 470pF 50V NP0 Ceramic R92 1/4W Metal Film 3k9 R93 1/4W Metal Film 62k C81 10pF 50V NP0 Ceramic DRAWING TITLE DRAWN BY © COPYRIGHT GENERAL NOTES The Audio Partnership 351A Amp Main PCB SHEET TITLE DATE IBQ Ipod Stage DRAWING No. Service Manual Gallery Court Hankey Place LONDON SE1 4BB 26/01/12 AP30263/A PAGE Tel : +44 (0)171 940 2200 Fax : +44 (0)171 940 2233 1. 5. 5/6 CHECKED BY 351A 15 Main PCB Gerbers 16 Service Manual Main PCB Gerbers 351A  17 Main PCB Gerbers 18 Service Manual Main PCB Gerbers 351A 19 Main PCB BOM RESISTORS Value 1 2 3 4 5 6 7 8 9 2R2 10R 91R 100R 220R 220R 470R 470R 1k Description/Type 2W Metal Film 2W Metal Film 2W Metal Film 1/4W Metal Film 3W Metal Film 1/2W Metal Film 1W Metal Film 1/4W Metal Film 1/4W Metal Film Qty 2 2 1 1 2 1 2 2 18 Component Ident R48, R67 R56, R68 R94 R47 R61, R63 R75 R62, R64 R81, R82 R7, R8, R10, R14, R17-R19, R24-R29, R41, R46, R65, R86, R90 R95 R13, R49, R79 R12, R80, R88, R92 R2, R3, R42, R43, R76 R4, R11, R44, R45 R33-R36, R85 R1, R20, R58, R70 R9, R57, R66, R69 R71-R74 R89, R93 R37-R40, R77, R78, R87, R91, R96, R97 R52, R54, R59, R60 R5, R6, R15, R16, R21-R23, R30-R32, R50, R51, R53, R55, R83, R84 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% 1% ManPN Tolerance 1% 1% 1% 1% PackageInfo 20mm Pitch 20mm Pitch 20mm Pitch 10mm Pitch 22. 5mm Pitch 12. 7mm Pitch 18mm Pitch 10mm Pitch 10mm Pitch AP Numbers 10 11 12 13 14 15 16 17 18 19 20 1k 1k8 3k9 4k7 8k2 10k 22k 27k 47k 62k 100k 1/2W Metal Film 1/4W Metal Film 1/4W Metal Film 1/4W Metal Film 1/4W Metal Film 1/4W Metal Film 1/4W Metal Film 1/4W Metal Film 1/4W Metal Film 1/4W Metal Film 1/4W Metal Film 1 3 4 5 4 5 4 4 4 2 10 12. 7mm Pitch 10mm Pitch 10mm Pitch 10mm Pitch 10mm Pitch 10mm Pitch 10mm Pitch 10mm Pitch 10mm Pitch 10mm Pitch 10mm Pitch 21 22 150k 270k 1/4W Metal Film 1/4W Metal Film 4 16 1% 1% 10mm Pitch 10mm Pitch RESISTORS VARIABLE Value 23 24 B20k MN20k Description/Type Tone Pot Balance Pot Qty 2 1 Component Ident VR2, VR3 VR4 ManPN VR162G1-B20K VR162G1-MN20KL15F Tolerance PackageInfo Dual Dual AP Numbers PY535 PY1234 Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. Please obtain these locally. 20 Service Manual CAPACITORS Value 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 No Fit NO FIT 10pF 50V 33pF 50V 100pF 50V 100pF 50V 220pF 50V 330pF 63V 470pF 50V 470pF 50V 680pF 50V 1nF 50V 10nF 250V 22nF 50V 22nF 50V 47nF 63V NP0 Ceramic NP0 Ceramic NP0 Ceramic NP0 Ceramic NP0 Ceramic Polypropylene NP0 Ceramic NP0 Ceramic NP0 Ceramic Ceramic X1/Y1 Mains Rated Ceramic Ceramic Met. Polyester Description/Type Qty 2 2 6 4 1 1 2 2 3 1 4 4 2 1 1 12 Component Ident C23, C39 C73, C74 C9, C15, C58, C59, C79, C81 C12, C13, C71, C72 C92 C93 C77, C82 C1, C10 C94, C96, C97 C95 C86-C89 C67-C70 C34, C35 C90 C91 C4, C5, C7, C8, C16, C17, C48, C51-C53, C75, C76 C2, C26, C36, C44 C84, C85, C98 C6, C11 C28 C3, C14, C18, C21, C25, C30, C31, C33, C37, C54-C57, C60-C66, C78, C80 C24, C27 C19, C22, C29, C38 C20, C32, C47, C83 C40 C41-C43 C49, C50 C46 C45 20% 5% 5% 5% 5% 5% 5% 5% 5% 5% 10% 20% 10% 10% 10% 5mm Pitch 5mm Pitch 5mm Pitch Box 2. 5mm Pitch 2. 5mm Pitch 2. 5mm Pitch CAP20 2. 5mm Pitch Through Hole 2. 5mm Pitch 2. 5mm Pitch 2. 5mm Pitch 2. 5mm Pitch ManPN Tolerance PackageInfo AP Numbers 351A 41 42 43 44 45 100nF 100V 100nF 100V 150nF 63V 470nF 10uF 35V Mono Ceramic Mono Ceramic Polyester Mains Rated X2 NP Electrolytic 4 3 2 1 22 10% 10% 5mm Pitch 5mm Pitch 5mm Pitch Box 22. 5mm Pitch Box 5mm Dia 46 47 48 49 50 51 52 53 10, 000uF 50V 47uF 16V 47uF 16V 100uF 50V 100uF 50V 100uF 25V 470uF 35V 1000uF 35V Electrolytic (with CA sleeve) NP Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic 2 4 4 1 3 2 1 1 20% 20% 20% 20% 20% 20% 20% 20% 30mm Dia 6mm Dia 5mm Dia 8mm Dia 8mm Dia Through Hole Through Hole Through Hole Note: Resistors, capacitors and other generic components are not usually stocked by the manufacturer. 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