28
28
HCD-GX45/RG440
5-5. BLOCK DIAGRAM — SUB WOOFER SECTION —
TH401
CN402
CONTROL
VCC
(+10V)
HOLD
DC DET
SUBWOOFER
AMP
IC302
SUBWOOFER
AMP
IC312
PRE DRIVE
Q401,402
CASCADE
Q405-407
CURRENT
MIRROR
Q403,404
OVERLOAD
DETECT
Q412
BIAS
Q408,409
SUBWOOFER
LIMIT SWITCH
Q309
SW MUTE
SW IN
L
M
JK401
SUBWOOFER
OUT
TUNER/TAPE/PANEL
SECTION
N
AMP/POWER SUPPLY
SECTION
AMP/POWER SUPPLY
SECTION
–VL
+VP
–VP
–VH
SWITCHING
Q424-426
SWITCHING
Q416
+
+
+VL
+VH
RY401
THERMAL
DETECT
Q420,421
MUTE
Q528
HOLD
Q414
RELAY
DRIVE
Q413
SW ON/OFF SENS
2
1
OUTPUT LEVEL
DETECT
Q417,419
OUTPUT LEVEL
DETECT
Q422,423
FINAL DRIVE
Q410,411
OVER CURRENT
DETECT
Q415
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