Philips FWM539 Mini Hi-Fi system – power amp, CD board and MCU board schematic:
Used ICs: HEF4013,
74CT04, NJ4556AM,LM324, TDA8920TH x 3, ML C8800, HT1381, WM8781, 74HC157A, BU9543,
TDA7073A
RMS output power
1KHz (Low channel-both channels driven) ................... 100 W per channel
10KHz (High channel-both channels driven).................. 100 W per channel
Total output power ..........................................................580 W
1KHz (Low channel-both channels driven) ................... 100 W per channel
10KHz (High channel-both channels driven).................. 100 W per channel
Total output power ..........................................................580 W
SPEAKERS
System 2-way; double port bass reflex
Impedance .............3 Ω
Woofer ..................2 x 5.25”
Tweeter .................2 x 1.75”
SUBWOOFERSystem 2-way; double port bass reflex
Impedance .............3 Ω
Woofer ..................2 x 5.25”
Tweeter .................2 x 1.75”
Impedance ........................6 Ω
Subwoofer driver .............. 8”
Sub-woofer output power ..180 W
Subwoofer driver .............. 8”
Sub-woofer output power ..180 W
Power amplifier circuit diagram [Click on the pictures to zoom in]
MCU board schematic
CD board schematic
Exploded view
LIQUID LENS CLEANING
Because the material of the lens is synthetic and coated with a
special anti-reflective layer, cleaning must be done with a
non-aggressive cleaning fluid. It is advised to use “Cleaning Solvent".
Before touching the lens it is advised to clean the surface of the
lens by blowing clean air over it. This to avoid that little particles
make scratches on the lens.
