Service manual

Schematic Diagrams
Fan Control & SpeedStep (71-M1900-D02) B - 25
Schematic Diagrams
Fan Control & SpeedStep
Sheet 23 of 34
Fan Control &
SpeedStep
VDD3
+5VS
+3V
+3V
VDD3
VDD3VDD3
+3V
+5V
+5V
+3VS
+3VS
+5VS
+3V
+3V
+1.8VS
FAN1-ON(22)
H8BEEP(22)
PCBEEP(14)
SPKROUT(17)
LBP (25)
OS#(3) PWRSW#(22,30)
RIA#(20,26) PME#(17,19,20,21,22)
DD_ON(22,28)
CPUSTP# (4,14)
H_DPSLP# (2,27)
VGATE(14)
VR_PWRGD(27)
PWRGD(9,14)
PWROK(22)
PSON#(14,24)
PCBEEP
SPKROUT
PWRSW#OS#
FAN1-ON
FAN_VCC
H8BEEP
H8_BEEP
DD_ON
RIA# PME#
H8_BEEP
H_DPSLP#
CPUSTP#
VGATE PM_GATEM
PWRGD
PSON#
PWROK
PM_GATEM
VR_PWRGD
Q7
2N7002
G
S D
R154
10K
R453
100K
D18
F01J2E
A C
T
C161
2200PF
Q12
2SC4672
B
E
C
R34 470
C56
0.1UF(R)
C284
0.1UF
L48
BK2125HS121
1 2
JFAN1
85205-3
1
2
3
R454
100K
D23
F01J2E
AC
C189
1UF
C605
1UF
R159
20K(R)
R163 0(R)
Q6
PDC114
C
E
B
U27
MAX809(R)_SOT-23
3
1
2
VCC
GND
RESET
R168
100K
U22
TC7S32F
1
2
3
5
4
IN
IN
GND
VCC
OUT
R123
4.7K
Q5
2N7002
G
DS
R488
4.7K
R489
24.9K
Q19
3904
B
E
C
R460 1M
C188
1UF
U20A
74(A)HC08
1
2
3
14
7
U6A
74LVC14
12
14
7
R155
47K
U8
MAX6306
1
2
3
4
5
RESET#
GND
MR#
RST-IN
VCC
R167
10K
C180
0.1UF
C171
10P
R515
56K_1%
R151 10K_1%
U20D
74(A)HC08
12
13
11
14
7
R499
10K
R498 0
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