Internal Block Diagram; Detailed Circuit Of The Output Power Amp - Marantz SA8400F1N Service Manual

IC508 : FAN8042

Internal Block Diagram

OPIN1-
OPIN1+
48
IN1+ 1
2
IN1-
3
OUT1
IN2+
4
IN2-
5
GND
6
GND 7
OUT2 8
IN3+ 9
10
IN3-
OUT3
11
12
IN4+
13
IN4- OUT4
Note.

Detailed circuit of the output power amp

From input opamp
SVCC
OPOUT1 VREF GND
47 46 45 44 43
10K
10 K
10 K
10K
10K
10 K
10 K
10K
10 K
10 K
10 K
10 K
14 15 16 17 18
CTL FWD REV GND
10 K
10K
Pref
10K
Vref
10K
Pref1 is almost PVCC1 / 2
Pref2 is almost PVCC2 / 2
OPIN2+
GND OPIN2-
42 41 40
40 K
40K
40K 10K
10K
40K 10 K
40K
10 K
40K
40K
40K
40K
40K
40K
40K
S M +
S
-
W C
MUTE123
19 20 21
GND SGND
MUTE123
40 K
DO+
+
40 K
40 K
+
DO-
40K
3-19
OPOUT2
PS PVCC1
39 38 37
POWER
SAVE
36
35
40K
34
33
40K
40K
32
40K
31
30
29
28
27
D
26
D
25
MUTE4 TSD-M
22 23 24
MUTE4 TSD-M PVCC2
DO1+
DO1-
DO2+
DO2-
DO3+
GND
GND
DO3-
DO4+
DO4-
DO5+
DO5-