NAD C 720BEE, Service Manual

Page: 19 / 38

D5
2 15V
C5
4
N.
I.
AC POW
ER CORD
C535
4n7/400V
SW
52
POW
ER SW
IT
CH
1 2 3
CZ55
!
!
C51
10n/250V
D51 KBU8D
C52
10n/250V
D55
KBU8D
C517
15000uF/50V 10%
C518
15000uF/50V 10%
Q
518
C1815
Q
517
A1015
D531
T
IC116D
D532 T
IC116D
R558 1K
R563 22K
R561 100
R562 1K
R560 1K R559 1K
R565 100 R564 22K
R531
0.05/3W
5% CE
R532 220
Q
510
A1015
Q5
9 A1015
R534 2K2
R533
2M
2
Q
519
A1015
Q
520
C1815
R566 4K7
D513 1N4004
R544 22K
C523
3300u/50V
C524
2200u/50V
1 2 3 4
CB54
1 2 3
CB55
!
!
!
!
!
F51
F52
F54
F53
! ! ! !
H1 H2 L1 L2 G
GND GND +
46V
-46V -37V +37V I-V AC DET
.
TR
IG
NAD C720BEE POWER CIR.
10%
10%
D501 DB104
C533 4700uF/16V
C536 100uF
1 2 3
CB56
1 2 3
CZ56
F55
500m
A/250V
6.3A/250V X4
RED GRAY BLACK ORANGE PURPLE
1 3
CB5
7
1 3
CZ5
7
1 2 3 4 5
CB5
1
1 2 3 4 5 6 7
CB5
2
1 2 3 4 5 6 7
CZ5
2
1 2 3 4 5
CZ5
1
1 2 3
CB5
8
1 2 3
CZ5
8
1
1
2
2
AC OUT
L
E
T
36.
4V 36.
4V 0V 28.
5V 28.
5V 8V 0V
R
567
10K
C53
330u/50V
C5
5 10uF
,50V
Q5
8 K
SA
1220
D5
3 30V
R
568
3K
3
1 2 3 4 5 6 7 8 9
10
CB5
3
CON1
0
T501
T
RANS
FORM
E
R
0V 32V 0V
VFD VFD -30V 5V GND
D54 DB104
2.
1V
2.
1V
!
C5
6
0.
22uF
BLUE BLUE RED RED Y
E
LLO
Y
E
LLO
BLACK
D56
DB104
! !
! !
! ! !
!
! !
!
3
1
2
IC
51
A
M
S1117-5.
0
SCHEMATIC DIAGRAM (2/4)
POWER SUPPLY CIRCUIT FOR Vm1.6
PCB-2: POWER BOARD FOR Vm5.0