![background image](http://html.mh-extra.com/html/sony/hcd-gt111/hcd-gt111_service-manual_420745025.webp)
HCD-GT111/GT222/GT444/GT555
HCD-GT111/GT222/GT444/GT555
25
25
7-3. BLOCK DIAGRAM - AMP Section -
OUT
LINE AMP
IC252
D
BASS AGC
F
SW OUT
E
POWER
AMP
IC800
MUTING
Q402
OVER LOAD
DETECT
Q801
OVER LOAD
DETECT
Q802
R-CH
MUTING
Q430
LINE AMP
IC253
STANDBY SWITCH
Q813
(TYPE A)
+
R-CH
R-CH
R-CH
MUTING
CONTROL
Q670
LINE MUTE
58
STK MUTE
51
SW SPK RELA
Y
52
+
R-CH
PROTECT DETECT
Q806, 809 - 811 (TYPE A)
Q806, 809, 811 (TYPE B)
FAN MOTOR
DRIVE
Q690, 691,
Q693 -695,
Q697
RY800
+
–
–
+
RY890
D632
D807
M
M102
(FAN)
FAN MOTOR
DRIVE
Q110 - 113
M
M101
(FAN)
PHONES
+
–
SUBWOOFER
JK890
RELAY
DRIVE
Q805
FR SPK RELA
Y
53
PROTECT
50
RELAY
DRIVE
Q804
R-CH
J702
SYSTEM CONTROLLER
IC401 (3/4)
: TUNER (FM/AM)
SIGNAL PATH
R-ch is omitted due to same as L-ch.
(GT444/GT555)
(GT222/GT444/GT555)
+
OVER LOAD
DETECT
Q803
R
L
FRONT
SPEAKER
JK800
PROTECT
G
DC DETECT
H
STBY LED
J
HP IN
C
DC DETECT
Q812, 814, 815
LEVEL SHIFT
Q447
(TYPE A)
(TYPE B)
DC DETECT
Q815
(TYPE B)
(Page 24)
(Page 24)
(Page 24)
(Page 24)
(Page 26)
(Page 26)
(Page 26)
Ver. 1.2
Note:
A part of circuit composition of POWERAMP board has been changed in the midway of production.
POWERAMP board that has not been changed appears as TYPE A, and the changed POWERAMP
board appears as TYPE B.