Sony WM-FX483 Service Manual page 12

IC301 LA4585M
27 26
PRE2
REV (L) 28
REV (R) 29
FWD (R) 30
FWD (L) 31
REF 32
REF
33 R.F
RIPPLE
MIX.1
MIX OUT (L) 34
MIX OUT (R) 35
36
PWR IN (R)
REF
DET
1 2 3
25 24 23 22 21 20 19
PRE1
REF
REF
LOW
BOOST
MIX.2
REF
DET
SYS.
REF
CONT
PWR.1
PWR.2
PWR.C
4 5 6 7 8
IC601 MM1370
20 19
OUTPUT
BIAS
CIRCUIT
CURRENT
CONTROL
FORWARD/REVERSE
SELECT SWITCH
1 2
IC331 NJM2185V
14
18 MIX IN (R)
17 HP IN (R)
16 LP1
15
L.B.GAIN
M.B.ON/OFF
14
1
LP2
13
12 DET1
11
FWD/REV
10 PRE MUTE
9
18 17 16 15 14 13 12
ERROR AMP
VELOCITY
CONTROL
START-UP
START-UP
CONTROL
LOGIC
PHASE SELECT
CIRCUIT
PRE DRIVER
3
4 5 6 7 8
— 12 —
13 12 11 10 9
G2
SUM
WEIGHT
BIAS
CIRCUIT
Ach BLOCK
Bch BLOCK (same Ach)
2 3 4 5 6
11
START-UP •
OSCILLATION
CIRCUIT
CIRCUIT
9 10
8
G1 V/I
Gm
7