Cambridge Audio 640-A Service manual
640A Integrated Amplifier
th
Issue Date: 16
SERVICE MANUAL – AP14676/1
SPECIFICATIONS:
December 2003 (Revised May 2008)
Power Output:
Input Impedance:
Loudspeaker Impedance:
Line:
Phono (using optional phono stage):
Total Harmonic Distortion (into 8 Ohms 80% rated power):
Frequency Response:
Bass:
Treble:
Signal to Noise Ratio (No weighting):
Slew rate (into 8 ohms):
Max. Power Consumption:
Dimensions (mm):
Weight:
65 watts into 8 Ohms
100 watts into 4 Ohms
47k Ohms
4 to 8 Ohms
380mV
1.75mV
0.005% THD (No weighting) @ 1kHz
0.003% THD (A weighted) @ 1kHz
0.01% THD (No weighting) @ 20Hz - 20kHz
5Hz to 50kHz +/- 1dB
+/- 10dB @100Hz
+/- 10dB @10kHz
92dB
40V/uS
615 watts
430 x 320 x 100
7 kg/15.4 lbs
Gallery Court Hankey Place London SE1 4BB UK
Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233
640A SERVICE MANUAL
TABLE OF CONTENTS
Safety Precautions & Important Notes 3
Amplifier Bias Set-up
Main Assembly BOM (Silver Unit)
Input & Tone PCB Schematic (Tone Control)
Revised: Input & Tone PCB Schematic (Input Select) 9
Input & Tone PCB Layout (Top Side)
Input & Tone PCB Layout (Bottom Side)
Input & Tone PCB BOM
Front Panel Schematics
Front Panel PCB Layout (Top Side)
Front Panel PCB Layout (Bottom Side)
Front Panel PCB BOM
Power Amp Schematic (Power Supply)
Power Amp Schematic (Protection)
4
5 – 7
8
10
11
12
13
14
15
16
17
18
Power Amp Schematic (Left Channel)
Power Amp Schematic (Right Channel)
Power Amp PCB Layout (Top Side)
Power Amp PCB Layout (Bottom Side)
Power Amp PCB BOM
Speaker Output Schematic
Speaker Output PCB Layout (Top Side)
Speaker Output PCB Layout (Bottom Side)
Speaker Output PCB BOM
Mains Input Schematic
Mains Input PCB Layout (Top Side)
Mains Input PCB Layout (Bottom Side)
Mains Input PCB BOM
19
20
21
22
23 – 25
26
27
28
29
30
31
32
33
IC Pin Layout Details
Silver / Black Difference BOM
Amended Input Circuit Schematic (Jan 2004)
Amended Input Circuit Schematic (March 2005)
34 – 38
39
40
41
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
manufacturer’s 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.
Cambridge Audio Azur 640A Amplifier Bias Setup
To set the bias on the 640A Amplifier:
Measure the voltage across R22 and R100 (Left channel) individually; they
should be adjusted using Preset R116 so that the voltage measured on each
resistor is greater than 13mV. This procedure should then be repeated for the
Right channel by measuring the voltage across R52 and R69 whilst adjusting
Preset R68 so that the voltage measured on each resistor is greater than 13mV.
4
Cambridge Azur 640A Amplifier (Main Assembly BOM Silver Unit)
AP PART No. DRAWING NO DESCRIPTION QTY COMMENTS
NEW CAMBRIDGE AMP PACKED UK VERSION 1
AP13074/1 POLY ENDCAP PACKAGING 2
AP13075/1 CARTON PACKAGING W/HANDLE 1 PRINTED TO ARTWORK AP…………
AP136131/1 CAMBRIDGE AUDIO NON-WOVEN BLUE BAG FOR
REMOTE
CAMBRIDGE NEW STYLE REMOTE COMPLETE 1 MOUNTED INTO POLY ENDCAP PACKING IN
AAA ALKALINE BATTERIES 3 FOR REMOTE. PLACE IN INSTRUCTION MANUAL
PY540 AP13969/1 AMPLIFICATION INSTRUCTION MANUAL 1
AP13933/2 CARTON LABEL (MODEL NO.) UK Silver 1 FOR BOX
SERIAL NUMBER LABEL, BLANK (6.5X35.5mm) 3 1 X REAR PANEL, 1 X BOX, 1 X SHIPPING CARTON
ISO 9002 LABEL 1 AFFIXED TO REAR PANEL ABOVE IEC SOCKET
AP10087/2 "MADE UNDER LICENCE IN PRC" STICKER 1 AFFIXED TO REAR PANEL BELOW IEC SOCKET
POLYBAG 173X260X4C mm 1 FOR INSTRUCTION MANUALOWNERS
AP13611/1 CAMBRIDGE AUDIO NON-WOVEN BLUE BAG 120mm
HEIGHT
1830mm AC IEC POWER CORD SET BS STANDARD
FUSED 3 AMP
RED TAPE SEAL FOR CAMBRIDGE CARTON 1
NEW CAMBRIDGE AMP UK VERSION ASSEMBLED &
TESTED
1 PACK REMOTE CONTROL INSIDE,
REBATE PROVIDED
POLYBAG
CERTIFICATE AND REMOTE BATTERIES
1 PACK AMP UNIT INSIDE
1 MUST BE BS APPROVED
1
AP13133/6
FRONT PANEL ASSEMBLY
PY592 AP10209/3 CAMBRIDGE SELECTOR KNOB MK3 3
AP10224/1 CAMBRIDGE KNOB INSERT MK2 3 INSERT INTO SELECTOR KNOBS
PY590 CAMBRIDGE NEW RANGE AMP VOLUME KNOB 1
PY581 AP12740/2 CAMBRIDGE NEW RANGE AMP FRONT PANEL
(PUNCHED AND PRINTED)
AP12935/1 CAMBRIDGE NEW RANGE AMP IR LENS 1 GLUED IN PLACE ON THE FRONT PANEL
AP12746/2 CAMBRIDGE NEW RANGE AMP SUB PLATE 1 FASTENEND IN PLACE INBETWEEN THE LEDGES
AP12931/1 CAMBRIDGE NEW RANGE AMP LIGHTGUIDE 5 FASTEN TO SUBPLATE
M3 X 6 POZI PAN STP SCREW 5 AFFIXES LIGHTGUIDES TO SUBLATE
M3 X 6 C/S POZI MACHINE SCREW 8 FASTEN THE SUB PLATE TO THE FRONT PANEL
AP11782/1 OPUS CONTROL BOX BUTTON 1 POSITION IN PLACE ON THE FRONT PANEL
AP13585/1 CAMBRIDGE NEW RANGE AMP 9mm TAC SWITCH
CUSHION
AP12925/1 CAMBRIDGE NEW RANGE AMP 7mm TAC SWITCH
BUTTON
AP12934/1 CAMBRIDGE NEW RANGE AMP 7mm TAC SWITCH
CUSHION
AP12926/2 CAMBRIDGE NEW RANGE AMP 7mm PUSH SWITCH
BUTTON
CONTROL PCB ASSEMBLY (FRONT PANEL SWITCH
PCB)
M3 X 6 POZI PAN MACHINE SCREW 10 USED FOR FIXING THE CONTROL PCB'S TO THE
AP13388/3 A600 FRONT PANEL PCB CABLE 1 CONNECTS TO FRONT PANEL SWITCH PCB AND
1 SCREENED WITH ARTWORK AP13679/2
ON THE FRONT PANEL
1 POSITION ON THE SUBPLATE OVER THE POWER
BUTTON CUT AND AFFIX USING ADHESIVE
PROVIDED ON THE CUSHION.
6 POSITION IN PLACE ON THE FRONT PANEL
6 POSITION ON THE SUBPLATE OVER THE POWER
BUTTON CUT AND AFFIX USING ADHESIVE
PROVIDED ON THE CUSHION.
2 POSITION IN PLACE ON THE FRONT PANEL
SUBPLATE STANDOFF'S
RUNS ALONG FRONT PANEL CONNECTING THE
SWITCH PCB TO THE POWER SWITCH AND THE
IR PCBS
5
AP PART No. DRAWING NO DESCRIPTION QTY COMMENTS
AP13453/2 A600 INPUT PCB TO FRONT PANEL SWITCH PCB 1 ATTACH FRONT PANEL PCB TO INPUT PCB AS
PER DRAWING
CABLE TIE 2.5mm X 100mm 2 ATTACH CABLE LOOM TO SUB PANEL
AP13391/2 A600 VOLUME MOTOR CABLE 1 ATTACH VOLUME POT MOTOR TO FRONT
PANEL SWITCH PCB
AP13394/2 A600 AMP PCB TO FRONT PANEL CONTROL PCB
CABLE
BOTTOM PANEL ASSEMBLY
AP12734/1 CAMBRIDGE NEW RANGE AMP BOTTOM PANEL 1
PY541 AP12652/2 CAMBRIDGE NEW RANGE FOOT MOULDING 4 POSITION IN PLACE ON BOTTOM PANEL
PY544 AP12883/3 CAMBRIDGE NEW RANGE FOOT PAD 4 AFFIX ON FOOT USING ADHESIVE SURFACE
M3 X 6 PLASTITE POZI PAN 4 AFFIX FEET TO BOTTOM PANEL
12.7mm PLASTIC PCB STANDOFF 9 PUSH SNAP FIT ON BOTTOM PANEL
M3 X 6 POZI PAN TAPTITE SCREW 12 TO AFFIX SUPPORT BRACKETS (POWER AMP
M4 X 12 POZI PAN MACHINE BOLT 2 FIX THROUGH EARTHING POINT HOLES ON
M4 NUT STANDARD 2 USED TO FIX ABOVE BOLTS
M4 LOCK WASHER 2 FOR EARTH BOLTS
M6 X 60 POZI PAN MACHINE BOLT 1 USED TO FIX MAIN TRANSFORMER IN PLACE
AP12629/5 230V 194VA TOROID TRANSFORMER 1
NEOPRENE TRANSFORMER INSULATION WASHERS 2 TO FIT EITHER SIDE OF TRANSFORMER
1 ATTACH FRONT PANEL PCB TO AMP PCB AS PER
DRAWING
ASSEMBLY) TO BOTTOM PANEL
BOTTOM PANEL
THROUGH THE BOTTOM PANEL
TRANSFORMER METAL BOTTOM PLATE 1 TO FIT UNDER BOTTOM PLATE ON M6 BOLT
M6 LOCK WASHER 1 PLACE ABOVE TRANSFORMER ON M6 BOLT
TRANSFORMER METAL TOP PLATE 1 PLACE ON TOP OF TRANSFORMER
M6 NUT STANDARD 1 USED TO FIX ABOVE BOLT
INPUT PCB ASSEMBLY 1 FIXES IN THE CORRECT POSITION ONTO THE
AP12715/4 BARE INPUT PCB 1
M2.6 X 6 POZI PAN MACHINE SCREW 10 TO AFFIX BOTTOM PANEL TO SIDE, FRONT AND
M2.6 X 10 POZI PAN PLASTITE 4 FIX CORNERS OF BOTTOM PANEL TO PLASTIC
SIDE PANEL ASSEMBLY 2
AP12726/1 CAMBRIDGE AUDIO NEW RANGE PRESSED SIDE PANEL
(3 RIDGE)
AP12729/1 CAMBRIDGE AUDIO NEW RANGE FRONT PLASTIC
SUPPORT (3 RIDGE)
AP12730/1 CAMBRIDGE AUDIO NEW RANGE REAR PLASTIC
SUPPORT (3 RIDGE)
M2.6 X 10 C/S POZI PLASTITE 8 TO AFFIX SIDE PANELS TO PLASTIC INSERTS
A600 REAR PANEL ASSEMBLY 1
AP12919/2 CAMBRIDGE AUDIO NEW RANGE AMP REAR PANEL
PRINTED
PLASTIC PCB STANDOFFS
REAR PANELS
INSERTS
2 POSITION IN PLACE ON PLASTIC FRONT INSERTS
2 POSITION AT FRONT WITHIN SIDE PANELS
2 POSITON AT REAR WITHIN SIDE PANELS
1 SCREENED WITH ARTWORK AP13665/2 THEN
POSITION ON REAR PLASTIC SUPPORTS
M3 X 10 POZI PAN PLASTITE 4 TO AFFIX REAR PANEL TO REAR PLASTIC INSERTS
M3 X 8 POZI PAN PLASTITE 9 TO FIX SPEAKER TERMINAL PCB AND ALSO FIX
PHONO SOCKETS ON THE INPUT BOARD TO
THE REAR PANEL
M4 X 8 POZI PAN TAPTITE 2 FIXES THE IEC SOCKET MOUNTED ON THE
POWER BOARD TO THE REAR PANEL
M3X12 MACHINE SCREW WITH PLASTIC KNOB AND
EXTERNAL TOOTH ZINC WASHER
1 PHONO GND SCREW ON REAR PANEL
6
AP PART No. DRAWING NO DESCRIPTION QTY COMMENTS
AP13389/2 A600 AMP PCB TO INPUT PCB POWER CABLE 1 FIT AS PER DRAWING - JST CONNECTORS
AP13393/2 A600 AMP PCB TO MAINS PCB CABLE 1 FIT AS PER DRAWING - JST CONNECTORS
AP13396/2 A600 INPUT PCB TO AMP PCB SIGNAL CABLE 1 FIT AS PER DRAWING - JST CONNECTORS
AP13392/2 A600 AMP PCB TO SPEAKER PCB CABLE 1 FIT AS PER DRAWING - JST CONNECTORS
SELF ADHESIVE CABLE TIE FIXING PAD 19mm X 19mm 3 2X SIDE PANEL, 1X REAR PANEL TO ATTACH
AP13395/1 LOOM TO SIDE OF CHASSIS
CABLE TIE 2.5mm X 100mm 10 (PLEASE FOLLOW EXAMPLE ON
MANUFACTURING SAMPLE UNIT OR USE AS
NECESSARY)
AP13340/1 A600 LIDDING TAPE FOR FRONT AND REAR PANELS 2 FIX TO THE CORRECT SURFACES FOR LID
AP13342/1 A600 LIDDING TAPE FOR SIDE PANELS 2 FIX TO THE CORRECT SURFACES FOR LID
PY542 AP12733/2 CAMBRIDGE AUDIO NEW RANGE TOP PANEL WITH
VENTS
PY516 M2.6 x 8 M/C Torx Recessed Plated 8 TOP PANEL SCREWS
1 POSITIONON TOP OF THE PRODUCT
7
Cambridge Audio Azur 640A Integrated Amplifier
R CH IN
L CH IN
HEADPHONE
R43
4k7
R45
8k2
R3
4k7
R11
8k2
VR3:A
B20K LINEAR
VR3:B
B20K LINEAR
J5
J6
J7
VR2:A
B20K LINEAR
VR2:B
B20K LINEAR
C11
150n poly
TERMINAL
TERMINAL
TERMINAL
C6
150n poly
5
R20
22k
5
2
C1
330p poly
R1
22k
2
46
C10
330p poly
46
13
13
R61
220R 3W C
R63
220R 3W C
R2
4k7
R4
8k2
R42
4k7
R44
8k2
R64
470R 1W C
R62
470R 1W C
+15V
3
2
-15V
C15
5p
+15V
8
3
2
4
CN2
8
7
3
2
4
5
1
HEADPHONE JACK
C29
10u 16V NP
R52
150k
C9
5p
C17
47n poly
8
U2:A
NE5532
4
C16
47n poly
R12
1
10k
6
5
R13
10k
U2:B
7
NE5532
C18
22p
C31
10u 16V NP
R54
150k
U4:B
6
R47
10k
5
NE5532
C21
22p
C20
47n poly
U4:A
1
NE5532
R46
10k
C19
47n poly
-15V
RSW1
RSW2
R
L
LSW2
LSW1
GND
C30
7
10u 16V NP
J3
TERMINAL
J4
TERMINAL
C28
10u 16V NP
R59
150k
R60
150k
SPEAKER SWITCHING
SW1:B
SW-DPDT
DEFEAT
SW1:A
SW-DPDT
DEFEAT
SW2:A
SW-DPDT
TAPE
SW2:B
SW-DPDT
TAPE
VR1:A
3
20K MOTORISED DUAL POT
2
6
1
4
VR1:B
6
5
4
20K MOTORISED DUAL POT
J1
TERMINAL
J2
TERMINAL
VR4:B
5
MN20K BALANCE
VR4:A
1
2
3
MN20K BALANCE
+15V
+15V
C27
47n poly
U5:A
8
3
1
2
4
NE5532
C24
47n poly
-15V
C32
100u 25V
C33
100u 25V
-15V
R CH OUT
CN3
1
2
3
4
5
6
H6 2.54mm
TO POWER AMP
U5:B
5
7
6
NE5532
L CH OUT
To enhance viewing, please print to A3 8
AP12714/5 Input & Tone PCB Schematic (Tone Control)
LCHOUT
RCHOUT
5
6
3
2
CN22
1
2
3
4
H4 2.54mm
© COPYRIGHT
The Audio Partnership
Gallery Court
Hankey Place
LONDON SE1 4BB
Tel : +44 (0)171 940 2200
Fax : +44 (0)171 940 2233
84
U6:B
NE5532
+15V
U6:A
NE5532
-15V
+45V
7
C2
47n poly
1
C3
47n poly
R55
680R
Cambridge Audio Azur 640A Integrated Amplifier
L R
CN4:B
DUAL PHONO
R9
56R
R8
56R
+30V
+15V
R48
100R
R56
100R
-15V
(Production change in 2003 - if R48/R56 fail, please refer to
Service Bulletin: TNBC-0006)
3
PREOUT L
CN13:D
QUAD PHONO
6
TAPE MON L
R51
100R
D1
12V Zener 400mW
D2
12V Zener 400mW
CN13:B
QUAD PHONO
3
TAPE OUT1 L
R22
220K
CN12:D
6
TAPE OUT2 L
R28
220K
R30
100R
C22
10u 25V
C23
10u 25V
QUAD PHONO
CN12:B
QUAD PHONO
3
AV IN L
R27
220K
R31
100R
CN11:D
QUAD PHONO
6
DVD IN L
R23
220K
R29
100R
+12V
-12V
CN11:B
QUAD PHONO
3
TUNER IN L
R21
220K
R26
100R
CN10:D
QUAD PHONO
6
CD IN L
R25
100R
CN10:B
QUAD PHONO
3
PHONO/AUX IN L
CN8
1
2
3
4
5
6
HEADER6
PHONO I/O
LK1
R17
+12V -12V
R24
100R
220K
C4
47n poly
28
27
26
25
24
23
22
21
20
19
18
17
16
15
U1
VDD
R1
R2
R3
R4
R-COM1
R5
R6
R-COM2
R7
R8
R-COM3
DATA
CK
NJU7313
dat
J8
CHASSIS
HEADPHONE
L-COM1
L-COM2
L-COM3
CN7
HEADER6
PHONO PSU
C5
47n poly
VEE
L1
L2
L3
L4
L5
L6
L7
L8
ST
VSS
clk
C26
100n Pre Only
R53
100R Pre Only
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CN10:C
QUAD PHONO
CN11:A
QUAD PHONO
CN11:C
QUAD PHONO
CN12:A
CN10:A
QUAD PHONO
4
1
5
2
2
CD IN R
TUNER IN R
+30V
6
5
4
3
2
1
PHONO/AUX IN R
R32
R33
220K
220K
QUAD PHONO
CN12:C
1
5
DVD IN R
R40
220K
QUAD PHONO
4
1
4
2
5
AV IN R
TAPE OUT2 R
R41
220K
CN13:A
QUAD PHONO
1
2
TAPE OUT1 R
R50
220K
CN13:C
QUAD PHONO
4
5
TAPE MONR
1
2
PREOUT R
CN4:A
DUAL PHONO
LK2
R6
220K
R34
R35
R36
100R
100R
100R
st
CN1
1
2
3
4
H4 2.54mm
R37
R39
R38
100R
100R
100R
R49
100R
R10
10k
C13
22p
RCHIN
LCHIN
R19
100K
C25
10u 16V NP
R16
100K
C14
10u 16V NP
U3:B
5
7
6
R15
100K
NE5532
R14
10k
+15V
C7
84
47n poly
U3:A
3
1
2
R18
100K
R7
10k
NE5532
C8
47n poly
-15V
R5
10k
C12
22p
To enhance viewing, please print to A3 9
AP12714/6 Input & Tone PCB Schematic (Input Select)
Cambridge Audio Azur 640A Integrated Amplifier
To enhance viewing, please print to A3 10
AP12714/5 Input & Tone PCB Layout (Top Side)
Cambridge Audio Azur 640A Integrated Amplifier
To enhance viewing, please print to A3 11
AP12714/5 Input & Tone PCB Layout (Bottom Side)
Cambridge Azur Input and Tone PCB BOM AP131336
AP PART No. DRAWING
NO
AP12715/5 BARE INPUT PCB 1
220R 3W CARBON FILM RESISTOR 2 R61, R63
470R 1W CARBON FILM RESISTOR 2 R62, R64
680R 1W CARBON FILM RESISTOR 1 R55
56R 0.25W METAL FILM RESISTOR 2 R8, R9
100R 0.25W METAL FILM RESISTOR 14 R24, R25, R26, R29, R30, R31,
4k7 0.25W METAL FILM RESISTOR 4 R2, R3, R42, R43
8k2 0.25W METAL FILM RESISTOR 4 R4, R11, R44, R45
10k 0.25W METAL FILM RESISTOR 8 R5, R7, R10, R12, R13, R14,
22k 0.25W METAL FILM RESISTOR 2 R1, R20
100k 0.25W METAL FILM RESISTOR 4 R15, R16, R18, R19
150k 0.25W METAL FILM RESISTOR 4 R52, R54, R59, R60
220k 0.25W METAL FILM RESISTOR 12 R6, R17, R21, R22, R23, R27,
5p CERAMIC 50/100V 5mm PITCH CAPACITOR 4 C9, C15
22p CERAMIC 50/100V 5mm PITCH CAPACITOR 4 C12, C13, C18, C21
DESCRIPTION QTY DESIGNATOR COMMENTS
R34, R35, R36, R37, R38, R39,
R49, R51
R46, R47
R28, R32, R33, R40, R41, R50
330p POLY 50/100V 5mm PITCH CAPACITOR 2 C1, C10
47n POLY 50/100V 5mm PITCH CAPACITOR 12 C2, C3, C4, C5, C7, C8, C16,
C17, C19, C20, C24, C27
150n POLY 50/100V 5mm PITCH CAPACITOR 2 C6, C11
10u 35V NON POLAR ELECTROLYTIC CAPACITOR 6 C14, C25, C28, C29, C30, C31
100u 25V ELECTROLYTIC CAPACITOR 2 C32, C33
PY487 NJU 7313 AUDIO SWITCH IC 1 U1
PY108 NE5532 OP AMP 5 U2, U3, U4, U5, U6
4 WAY JST CONNECTOR 2.54mm PITCH 3 CN1, CN22
6 WAY JST CONNECTOR 2.54mm PITCH 1 CN3
ZUANBAO CK-6.35-08A (SILVER BEZEL)
HEADPHONE JACK
ZUANBAO AV2-8.4-9 GOLD DUAL PHONO SOCKET 1 CN4
ZUANBAO AV4-8.4-9 GOLD QUAD PHONO
SOCKET
6 WAY PIN HEADER 2.54mm PITCH 13mm LONG 2 CN7, CN8 AS PER EXISTING A500 INPUT PCB
DPDT WEALTH PBS-22HO1-T18-SL SWITCH 2 SW1, SW2
PY004 20k MOTORISED DUAL LOG POT RM16 WITH 22mm
LEGS
PY535 B20k LINEAR POT 2 VR2, VR3
PY005 MN20k BALANCE POT 1 VR4
LINK WIRE 24SWG 20mm LONG 30 LK1, LK2, ALL BLANK LINK
M3 X 14 POZI PAN MACHINE SCREW BLACK 1 USED TO FIT OPTIONAL PHONO
M3 LOCKWASHER 1 USED TO FIT OPTIONAL PHONO
M3 NUT BLACK 2 USED TO FIT OPTIONAL PHONO
AP13395/2 640A INPUT PCB TO SPEAKER PCB LOOM 1 CONNECT AS PER DRAWING TO
1 CN2
4 CN10, CN11, CN12, CN13
1 VR1
POSITIONS
STAGE
STAGE
STAGE
INPUT PCB BEFORE FITTING
INPUT PCB TO CHASSIS
AP10001/2 CAMBRIDGE AUDIO SCREENING CAN 1 EMBOSSED WITH ARTWORK
AP10018/1
12
Cambridge Azur 640A Integrated Amplifier
+5V
R35
10k
HEADPHONE
+5V
U5
1
RTCC
2
VDD
3
N/C
4
VSS
5
N/C
6
RA0
7
RA1
8
RA2
9
RA3
10
RB0
11
RB1
12
RB2
clock
13
RB3
data
14
RB4
strobe
PIC16C57
R28
R29
10k
10k
DGND1
C23
100n
+5V
D1
1N4148
DGND1
MCLR/VPP
28
CKIN
27
CKOUT
26
RC7
25
RC6
24
RC5
23
RC4
22
RC3
21
RC2
20
RC1
19
RC0
18
RB7
17
RB6
16
RB5
15
+5V
R27
10k
CRS1
R30
33k
FREQ=4MHz
C22
strobe
100n
clock
data
vol up
vol down
speaker relay
clip
dc
standby relay
overcurrent/short
temp
R4
10k
DGND1
LK3
LINK
HEADPHONE
REMOTE IN
+5V
+5V
DGND1
CN1
1
2
3
4
H4 2.54mm 90
DGND
SW5
TUNER
SW6AVSW7
SW9
TAPE MON
C24
100n
LK9
LINK
8
7
6
5
4
3
2
1
CN2
H8 2.54mm 90
SW4
CD
PHONO/AUX
SW10
DVD
8
U7
10
QS
VSS
9
QS
11
Q7
12
Q6
13
Q5
14
Q4
15
1
3
2
OE
STB
CLK
D
74HC4094
7
Q3
6
Q2
5
Q1
4
Q0
VDD
16
Q2
R5
BC337
10k
DGND1
R33
DGND
820R
R2
10k
R7
820R
R6
820R
LK8
LINK
DGND1
DGND1
D2
CHANNEL LEDD3CHANNEL LED
R1
220R
+5V
H9 2.54mm 90
CN6
CN5
1
2
3
4
5
6
7
8
9
CONN-H9
C4
100n
D4
CHANNEL LEDD5CHANNEL LEDD6CHANNEL LED
LK5
LINK
U6
BA6218
SNAP OFF SECTION (c)
D9
Standby
Blue flat top LED
+5V
1
FIN
2
GND1
3
RIN
4
NC
5
GND2
6
VCC
7
OUT2
8
COM
9
OUT1
LK1
LINK
DGND
C3
47u 16V
Red LED
protection
lead mounted
1
2
3
4
5
6
7
8
9
D8
DGND1
SW3
1
2
3
U9
TSOP18 IR RECEI
STANDBY
OPT
GND
+5V
vol up
vol down
C21
100n
R3
820R
D7
CHANNEL LED
SNAP OFFSECTION (d)
CN7
2
1
H2 2.54mm 90
MOTOR
C1
100n
To enhance viewing, please print to A3 13
AP12711/9 Front Panel Schematics
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