Philips MCM8/21 Service Manual page 60

Power 2003 75 - 150W Class D
Combi Board Circuit Diagram Overview
S S P
OURCE ELECTOR ART
Inputs:
AUX
Tape / USB / Sound Agent
Tuner
CD
Source Selector IC + sound processing
Data generation for spectrum analyzer
Digital Out (provisional only)
Overvoltage protection for:
+AMP
-AMP
+5V6
+12V_A
Control Lines
1
Chapter 11-5
11-4
O P A
SCILLATOR & RE- MPLIFIER
Generation of following supplies:
+12V_A, +12V_M
+5V6 → +5V_AMP
Pre-Amplifier + mute circuit
Adjustment of offset
500kHz Square wave Oscillator
Chapter 11-7
Signal flow
P
ART
3
11-4
A P
MPLIFIER ART LEFT CHANNEL
Modulator
Driver + Level shifter
Power FETs
4
Protection circuits
Chapter 11-8
A P
MPLIFIER ART RIGHT CHANNEL
Modulator
Driver + Level shifter
Power FETs
5
Protection circuits
Chapter 11-9
Speaker relay
A F L P
UDIO REQUENCY & OGIC ART
Headphone Amplifier
Subwoofer out (provisional only)
Port Expander (shift register)
2
Generation of +5V_CD
Fan control
Chapter 11-6
p
P2003 Class D Drawing Overview 2003 11 18