Technical Manual
FT420
– Iss 2.4
46
3.9.1 Audio Amplifiers
Three different Audio Amplifiers are available to fit within the FT420 system:
1 SUB865 60 Watt audio amplifier
2 SUB866 120 Watt audio amplifier
3 SUB867 250 Watt audio amplifier
Large amplifiers e.g. 120W or 250W require separate power supply and larger cabinets.
3.9.2 60/120 Watt Amplifier Module
Features:
➢
High energy efficiency class D amplifier design.
➢
Available in 60W and 120W configuration.
➢
Standby function to reduce power consumption.
A UD
IO
O
U T
A
U
D
I
O
I
N
CA L .
S
T
D
B
Y
PCB218R1
SUB865/ SUB866
(T
X S
E C)
V OL UM E
2
4
V
d
c
D
1
2
R16
C13
R10
R8
R3
Q 20
Z1
VR2
VR1
U6
U4
U3
U2
U1
R60
R59
R58
R57
R56
R55
R54
R53
R51
R49
R48
R45
R43
R42
R41
R40
R38
R37
R34
R33
R32
R31
R15
R13
R9
R7
R6
R5
R4
R2
R1
Q 19
Q 18
Q 17
Q 16
Q 15
Q 14
Q 13
Q 12
Q 11
Q 9
Q 8
Q 7
Q 6
Q 4
Q 3
Q 2
Q 1
L2
L1
F1
D5
D4
D3
D2
D1
C ON
3
C
O
N
2
C
O
N
1
C34
C33
C31
C30
C29
C25
C24
C23
C22
C21
C20
C19
C18
C17
C15
C12
C11
C10
C9
C8
C6
C5
C4
C3
C2
C1
C35
C36
C37
R12
D6
D7
D8
D9
D
1
0
D
1
1
D
1
3
D14
BRO O KS
AUSTRALI A
C7
FU SE
PO W ER
IN PU T
STA N D B Y
A U D IO
IN PU T
VO LU ME A D J U C TMEN T
C A LIB ER A TIO N
(FA C TO R Y U SE O N LY)
TO SPEA K ER /
1 0 0 V A U D IO TR A N SFO R MER
Figure 23 Class-D 60W / 120W Audio Amplifier Board Layout
60 Watt
120 Watt
Figure 24 60W / 120W Audio Amplifier photos