здесь подписаны выходы микрухи PGND2/TAB 1 power ground 2 and connection for heatsink
SDA 2 I
2
C-bus data input and output
OUT3− 3 channel 3 negative output
SCL 4 I
2
C-bus clock input
OUT3+ 5 channel 3 positive output
VP2 6 power supply voltage 2 to amplifier
OUT1− 7 channel 1 negative output
PGND1 8 power ground 1
OUT1+ 9 channel 1 positive output
SVR 10 half supply voltage filter capacitor
IN1 11 channel 1 input
IN3 12 channel 3 input
SGND 13 signal ground
IN4 14 channel 4 input
IN2 15 channel 2 input
ACGND 16 AC ground
OUT2+ 17 channel 2 positive output
PGND3 18 power ground 3
OUT2− 19 channel 2 negative output
VP1 20 power supply voltage 1 to amplifier
OUT4+ 21 channel 4 positive output
STB 22 standby or operating or mute mode select input
OUT4− 23 channel 4 negative output
PGND4 24 power ground 4
DIAG 25 diagnostic and clip detection output, active LOW
RST 26 reset output
SW2 27 antenna switch; supplies unregulated power to car aerial motor
RESCAP 28 reset delay capacitor
SW1 29 amplifier switch; supplies unregulated power to amplifier(s)
REG1 30 regulator 1 output; supply for audio part of radio and CD player
REG3 31 regulator 3 output; supply for signal processor part (mechanical digital) of CD player
GND 32 combined voltage regulator, power and signal ground
REG4 33 regulator 4 output; supply for mechanical part (mechanical drive) of CD player
REG5 34 regulator 5 output; supply for display part of radio and CD player
VP 35 power supply to voltage regulator
BUCAP 36 connection for backup capacitor
REG2 37 regulator 2 output; supply voltage to microcontroller