Sony PMC-MD55 Service Manual page 145

PMC-MD55
6-6. BLOCK DIAGRAM – SUPER WOOFER Section –
J811
SIGNAL INPUT
(WOOFER)
(TO PLAYER UNIT)
FROM POWER AMP
Q
SECTION
(Page 45)
WOOFER AMP (B) BOARD
FILTER AMP
IC811
CN803
(1/2)
3
5 7 3 1
D811
WOOFER MUTE PROTECT CONTROL
Q811, 812 Q813
W-LED BOARD
CN825
1
D821
LEVEL
05
– 45 –
W-VOLUME WOOFER AMP (A) BOARD
BOARD
CN803
CN821 CN821
(2/2)
(1/2) (2/2)
4
3 4 IN+
3
TRANSCONDACTANCE
RV821
LEVEL
CN822
LED STANDBY
1
1 1
DRIVE SWITCH
Q818 Q816
POWER
CONTROL
Q815
B+
(+18V)
B+ +10V REGULATOR
(+10V) Q814
B–
(–18V)
WOOFER
AMP
IC812
BIPOLAR MOS GAIN & MOS SHORT
OUT
LEVEL SHIFTING OUTPUT CIRCUIT
INPUT STAGE STAGE STAGE PROTECTION
STANDBY/
MUTE
STBY MUTE
9 10
D815
MUTEING
CONTROL
Q817
T801
POWER
D801-804
TRANSFORMER
RECT
CN811 CN802
1 1
3 3
W-POWER BOARD
– 46 –
CN812
2
14 SP800
(SUPER WOOFER)
CN801 AC IN
J801
AC OUTLET
MAX 35W
• SIGNAL PATH
: FM