Pioneer S-W1EX Service Manual page 15

5
÷ When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or
"PCB PARTS LIST".
÷ The > mark found on some component parts indicates the importance of the safety factor
of the part. Therefore, when replacing, be sure to use parts of identical designation.
÷
: The power supply is shown with the marked box.
0V VC
(6.6V)
BUFFER
COMPRESSOR
DETECTOR
E
D AMP ASSY (AWU8170)
CN32
B7B-PH-K-S
VA+12V
1
GNDR 2
3
VA-12V
GND 4
GND
5
GND
6
AC DET
7
5
6
5V
(NO SIGNAL)
5V
(SIGNAL)
BUFFER COMPARATOR
DELAY
GENERATOR
DELAY
GENERATOR
OSC
9V
VC
3V
(185KHz)
FERRITE CORE
DTH1168-
CAUTION -
ADX7445-
PRIMARY
SECONDARY
T1
G
SMPS ASSY
(AWU8163: LF)
(AWU8164: MLT)
6
7
FET
G
G
G
G
FEEDBACK
GND
LPF
LPF
DC OFFSET ADJ
PROTECTION
OVER LOAD
DC DETECT
POWER ON DELAY
FOR CONTINUED PROTECTION AGAINST RISK OF FIRE.
REPLACE WITH SAME TYPE AND RATINGS OF FUSE.
LIVE
NEUTRAL
4
ADX7444-
S-W1EX
7
8
23.5V
(SP+)
23.5V
(SP-)
B2PS-VH
2 SP-
1
SP+
RELAY
CN481
D
S
LPF
D
S V1
GND
D
S
NOTE
LPF
ADJUST DC OFFSET BETWEEN
D
PIN1 AND PIN2 OF CN481
OR CHECK POINT V1 AND V2
S V2
OR L481 LEAD WIRES
TO 0V (LESS THAN +-20mV)
AT NO SIGNAL INPUT AND
MAIN VOLUME MIN
AFTER RELAY ON.
WHEN
THE FIRST TIME TO TURN
AMP ON AT PRODUCTION
PROTECTION
LINE,
RELAY DRIVER
EXCHANGING D AMP ASSY,
EXCHANGING FET
(Q421,Q431,Q441,Q451),
EXCHANGING FET DRIVER
(IC421,IC441)
*
FU1
LIVE
2
1
CN2
NEUTRAL
B2P3-VH
FERRITE CORE
DTH1158-
3 2 1
CN1
B4P7-VH
A
SPEAKER UNIT
B
C
D
AC INLET
AKP7197-
E
POWER CODE
*
F
15
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