Sony PMC-MD55 Service Manual page 144

6-5. BLOCK DIAGRAM – POWER AMP/POWER SUPPLY Section –
AU/JACK BOARD (3/4)
LINE
AMP
IC352
FROM FUNCTION
N
SELECT SECTION 3 1
(Page 42)
SPEAKER
MUTE
MEGABASS
Q152
SWITCH
Q151
MEGABASS
R-CH CONTROL
Q362, 363
D353
D358
MEGABASS
ON/OFF
Q360
B+
(HEADPHONE AMP)
CN304 (2/2)
6 4 7
6 4 7
CN303 (2/2)
MAIN BOARD (6/6)
TO TUNER
VT
G
SECTION
(Page 33)
+3.3V
11 M/B PA-STANDBY
B+
REGULATOR
A MUTE
(AU +3.3V)
IC403
SYSTEM
CONTROLLER
IC405 (5/5)
B+
B+
B+
SWITCH
(AU +8V) HP-SW
(+8V)
Q413
31 RADIO POWER
RST
B+
B+ B+
ACCHK
SWITCH
(RDS) (MD +5V)
3
Q413
(AEP, UK)
05
L
R-CH
HEADPHONE
R
AMP
IC353 HEADPHONE CN304
MUTE (1/2)
Q154 1
6 3
R-CH
R-CH
MEGABASS
IC354,
Q352, 361
D359
MUTE
DRIVE
Q351
D364
B+
(AU +8V)
2
B+ B+ +8V
3
SWITCH SWITCH REGULATOR
Q359 Q355 Q354
POWER
4
STANDBY
Q356
Q353
CN310
(1/2)
CN307(2/2)
10 8 9
10 8 9
CN302 (3/3)
B+
(CD +6V)
97
98
D401
BU +3.3V
B+
3 REGULATOR 2 3
(+3.3V)
IC402
B+
B+
SWITCH
(COM+5V)
Q401
B+
(MD +5V)
45
S401
RESET
RESET
SIGNAL
40 1 2
GENERATOR
IC404
AC
CHECK
Q412
– 43 –
J301
POWER AMP (A)
SIGNAL OUTPUT
BOARD
(TO SPEAKER(L) UNIT)
CN393
CN394
L
4 4
R-CH
J391
R
SIGNAL INPUT
(TO PLAYER UNIT)
R-CH
1 J301
2
CN303
(1/2) JACK OUT
JACK IN
MAIN BOARD (5/6)
CN391
1
TO SUPPER WOOFER
Q SECTION
(Page 45)
2
J302
4
SIGNAL OUTPUT
(WOOFER)
(TO SUPER WOOFER UNIT)
AUMUTE
UNREG 10V
PA-STBY
CN310
POWER INPUT
(TO SPEKER(L) UNIT)
AU/JACK BOARD (4/4)
CN401 CN308
+6V
3 3
UNREG 8V
REGULATOR
1 1
Q402 ACCHK
REGULATOR
SWITCHING
Q403,408,409
+5V
REGULATOR 1
IC401
FROM CD
P-CON
M
SECTION
(Page 38)
HP-SW
CN406
(3/3)
3 BU +3.3V
BU +3.3V
POWER AMP (C) BOARD
CN392
1
+OUT2
9
IN2 POWER
4
AMP
2
–OUT2
11
+OUT1 14
–OUT1 12
6 5
AUMUTE
STANDBY
SWITCH
Q391, 392
PA-STBY
UNREG 12V
POWER AMP (B) BOARD
POWER BOARD
D901
CN901
RECT
4
UNREG 12V
2
PA-STBY
1
AUMUTE
CN902
2
D905-908
RECT
3
UNREG 10V UNREG 10V
4
PA-STBY
D902
RECT
CN902
POWER OUTPUT
(TO PLAYER UNIT)
CN310
(2/2)
8 8
UNREG 8V
9 9
5 5
ACCHK
TO PANEL
UNREG 8V
O
SECTION
(Page 42)
TO PANEL
P
SECTION
(Page 42)
– 44 –
PMC-MD55
SP391
L-CH
SPEAKER(R) UNIT
1
SP392
(R-CH)
2
J392
SPEAKER
OUTPUT
R-CH
IMPEDANCE
USE4Ω
POWER AMP (D)
BOARD
T901
POWER
TRNSFORMER
CN903
AC IN
1
2
D903
D904
D903,904
RECT
• SIGNAL PATH
: FM
R-CH : Same as L-CH.