Pioneer SX-20-K Service Manual page 15

5
ASSY
V+24V
(for RELAY)
m)
m)
CK CHASSIS
5
6
R463(NM)
C418(0.022uF)
D404(NM)
D405(NM)
WIRE400
(CHGND)
V+3V
C551(NM)
(for MUTE)
MUTE
CIRCUIT
V+15V
Power Amp
(+27dB)
V+B
V-B
C711(NM)
C712(NM)
3V3
V+24V V+24V V+24V
(for RELAY) (for RELAY) (for RELAY)
J116
(0 ohm)
J392
(0 ohm)
R332A
(NM)
C318R
(0.047uF)
+ - + -
SP_B_Rch SP_A_Rch SP_A_Lch
GT7
(CHGND)
6
CHGND
S_GND(Power AMP)
S_GND(HEADPHONE)
S_GND(PHONO)
V+15V
IC502
IC503
V-15V
A_GND
S_GND
V+3V
(for MUTE)
C331(10uF)
C342L/R(100uF)
C343L/R (NM)
C340L/R(100uF)
C341L/R (NM)
V-30V
R331A
(NM)
C318L
(0.047uF)
+ - + - + - + - + - + -
SP_B_Lch
GT6
(CHGND)
SX-20-K
7
A_GND(±15V)
A_GND(TUNER)
A_GND(Relay)
CPU GND(subtrans)
D_GND(Protection)
V+24V
(for RELAY)
V+B
C509(6800uF)
J363(0 ohm)
C550(0 ohm)
C510(6800uF)
GND101
(CHGND)
V-B
J272(0 ohm)
C542(0.047uF)
C524(NM)
C525(NM)
GND401
(CHGND)
AC
3V3
RELAY
IC301
C303
C308
(470uF)
7
8
A
B
S2
C
S1
Main Trans
D
E
Sub Trans
F
15
8