Philips MC-77/22 Service Manual page 61

11-7
Power 2002 70W Class D
Combi Board Circuit Diagram Overview
S S P
OURCE ELECTOR ART
Inputs:
AUX
Tape
Tuner
CD
Source Selector IC + sound processing
Data generation for spectrum analyzer
Digital Out
Overvoltage protection for:
+AMP
-AMP
+5V6
+12V_A
Control Lines
1
Chapter 11-8
O P A P
SCILLATOR & RE- MPLIFIER ART
Generation of following supplies:
+12V
+5V6
+5V_AMP
+5V6_AMP
Pre-Amplifier + mute circuit
Adjustment of offset
Square wave Oscillator
3
Chapter 11-10
Signal flow
11-7
A P
MPLIFIER ART LEFT CHANNEL
Modulator
Driver + Level shifter
Power FETs
4
Protection circuits
Chapter 11-11
A P
MPLIFIER ART RIGHT CHANNEL
Modulator
Driver + Level shifter
Power FETs
5
Protection circuits
Chapter 11-12
Speaker relay
A F L P
UDIO REQUENCY & OGIC ART
Headphone Amplifier
Subwoofer out
Port Expander (shift register)
2
Generation of +5V_CD
Fan control
Chapter 11-9
p
P2002 Class D Drawing Overview 2002 04 05