Cambridge Audio 840A Service Manual page 26

10A for 115V
MAINS IN
6A3 for 230V
J24
F1
T6A3 AL
BROWN
LVD!
LIVE
C13 C23
X2 470N SUPPRESSION X2 470N SUPPRESSION
ALTERNATIVE POSITIONS FOR
X-CAPS WITH DIFFERENT LEAD PITCHES
+15V
+9V PSU
-15V
CN2
MAINS ON/OFF INRUSH CONTROL
D25 D9
+15V 1
2 2
2
-15V 3
4 PSU GND
1 1
0V 5
6 ME14FW009HS ME14FW009HS
+9V 1N4001
7 1N4001
+5V PSU
RL3:A RL4:A
8
9
MAINS FAIL IN
10 PSU GND
MAINS ON/OFF
11
INRUSH
12
FFC 12WAY
D24
R87
AC
47K
1N4002
C28
R79
4U7 50V
4K7
MAINS FAIL RECTIFIER
J27
BROWN
PSU PCB PSU GND
J26
BROWN
MAINS IN
C11
CN3
X1 10n
N
E
GROUND
L
IEC-SOC
C12
CHASSIS GND
X1 10n
To enhance viewing, please print to A3
AP16373/4 Power Amplifier (Right) Power Supplies & PSU PCB Schematic
Cambridge Audio Azur 840A Amplifier
MAINS ON/OFF RELAY
X1 10n
C30
RL3:B
4/5 3/6
ME14FW009HS
INRUSH CONTROL RELAY
MAIN TRANSFORMER
C29 X1 10n
TO MAIN TRANSFORMER
RL4:B
J2
R78 BROWN
4/5 3/6 1
10R 10W WW
ME14FW009HS 230 V
BROWN/BLACK
LIVE
J1
BLUE
2
BLUE/WHITE 0 V
117 DEG C
NEUTRAL
STANDBY TRANSFORMER
J8
BROWN
1
TERMINAL
230 V
NEUTRAL
Primary
NEUTRAL
J9
BLUE
2
TERMINAL
0 V
113 DEG C
NEUTRAL
J25
LIVE
BROWN
MAINS SWITCH
ON REAR PANEL
RED
1 36 V
5.5A
ORANGE
TO POWER AMP SUPPLY LEFT
2 0V
(SEPARATE PCB)
Secondary
YELLOW
3 36 V
5.5A
GREEN
4 38 V
100 mA
RED
Primary 1 36 V
5.5A
ORANGE
2 0V
Secondary
YELLOW
3 36 V
5.5A
J13
GREEN
4 38 V
100 mA TERMINAL
GREEN
20MM T1AL
J6
RED
1 7.5 V
500mA TERMINAL
Secondary 1
J7
ORANGE
2 0V
TERMINAL
YELLOW J3
3 17 V
100mA
TERMINAL 20MM T1AL
BLACK
J5
GREEN
4 0V
TERMINAL
GREY
Secondary 2
VIOLET J4
5 17 V
100mA
TERMINAL
GREEN
J10
+48V R
+48V IN
TERMINAL
RED
C25
15000uF-63V
J11
POWER AMP SUPPLY RIGHT
FROM RECTIFIER BOARD 0V IN
TERMINAL
C26
BLACK
15000uF-63V
J12
-48V R
-48V IN
TERMINAL
C27
ORANGE
1000uF-50V
D23
F7
R88
T1A AL
33R 1W
1N4002
LVD!
F4
AC
RELAY SUPPLY
D19 D20
4700u 16V
7805
1
VI
C24
1N4002 1N4002
C20
C34
100nF ceramic
X1 10n
D21 D22
R95
+9V PSU
1N4002 1N4002
2R2 0.5W
C33
4700u 16V
U3
7815
F2
1
VI VO
D15 D16
C37
X1 10n C14
1000U 35V EL
C35
1N4002 1N4002
X1 10n
D17 D18
C15
470u 35V
C36
1N4002 1N4002
2
X1 10n
VI
F3
U4
7915
20MM T1AL
+5V IN
R96 R81
R77
100K 33K
10K
LOW = NORMAL
5
+310 mV
7
MAINS FAIL
6
MAINS FAIL IN
U1:B TO SHEET 1
+600 mV
LM393
R80
2K2
MAINS FAIL DETECT
C17
220uF 100V
-51V R
MICROCONTROLLER SUPPLY
3
VO +5V PSU
C16
47u 16V
U2
C31
100nF ceramic
PSU GND
C32
OPAMP SUPPLY
100nF ceramic +15V
3
C18
100u 25V
C19
PSU GND
100u 25V
-15V
3
VO
C22
100nF ceramic
PSU PCB
26