Pioneer SC-LX901B Service Manual page 9

1
Detection circuit
Fan Abnormality Detection
D
1SR154-400
!
2SD2400A-D
+13.5V
Q7205
DTA124EUA
Q7204
DTC124EUA
GND_MD
C
Q7207
DTC124EUA
-13.5V
2SB1569A-D
1SR154-400
BAPS-2089
B
A
1
2
FANCTLL
FANCTLH DTA124EUA
Q7224
D7211
Q7223
D7215
Q7211
1SR154-400
DTC124EUA
Q7222
DTC124EUA
DTA143EUA
Q7225
D7200
1SS355
D7216
1SR154-400
Q7221
DTC124EUA
Q7212 Q7226
!
DTC124EUA
D7212
Power Supply for
COOLING FAN
2
3 4
V+8_MD
P5852B
-1
-2
-3
V+FAN
C7294
V-FAN
471K CH
LOCK DET
C7222
471K CH
R7223
1M
1SS355
D7221
R7221
22k
FAN V+FAN V-FAN
OFF 0V 0V
LOW -0.7V -6.5V
HIGH +6.5V -6.5V
3 4
5
P5852A
P7151B P7151A
-1 -1
FANERR
-3
FANCTLL -2
FANCTLH -3 -2
BAETC-
2200
5
6
Protection
-26
XFANERR
-24 FANCTLL
-25 FANCTLH
BAETC-
2201
-4 -5 -3
P7002B
P7002A
-4 -5 -3
BAETC-
2163
-7 -6 -5
P7001A
P7001B
24 25 26
BAETC-
2203
-7 -6 -5
P1602B
P1602A
-7 -6 -5
3 19
UCOM
Q1610
BAPRC-
2072
SC-LX801/SC-LX901
6
D
C
B
A