MiTAC 8575 - Page 139

138
8575
8575
N/B Maintenance
N/B Maintenance
8.1 No Power
When the power button is pressed, nothing happens, no fan activity is heard and power indicator is not light up.
PF501
PL501
120Z/100M
PD501
RLZ24D
J2
+DVMAIN
PD514
POWER IN
PC501
0.1µ
PC502
0.1µ
PL508
120Z/100M
JS501
S
D
2
3
1
6
7
8
5
G
PU502
SI4835DY
JO502
PR507
470K
ALWAYS
PD503
PD504
ADINP
PR508
100K
PQ501
2N7002
PR509
1M
LEARNING
PD505
PD506
PR516
4.7K
PC518
0.1µ
PC523
1000P
F504
ALWAYS
8
IN
F/B
5VTAP
SHUTDN
GND
7
6
3
4
OUT
SENSE
1
2
U506
LP2951-02BM
P27
+5V
D508
RLZ5.6B
DS
G
Q509
SI2301DS
+5VA
SW_+5VA
C699
4.7µ
R621
100K
DS
G
Q511
SI2301DS
Q510
DTC144WK
R618
10K
H8_AVREF1
C698
10µ
D516
UDZ5.6B
-SW_+5VA
From H8
To H8
Step1 : Connect Adaptor to ( D/D BD ) J2 & O/P “ALWAYS”.
Step2 : “ALWAYS” --> U506 Generate +5VA.
Step3 : H8 O/P “LEARNING” for Charger Circuitry.
Step4 : For MOSFET “PU502” G=0,D<-->S.
Step5 : O/P “ADINP”& “+DVMAIN”.
VCC
RS+/-
+VDD5S
PC4
0.1µ
3
4,5
OUT
6
PC5
1µ
PR3
10
I_LIMT
P2
MAX4173FEUT-T
PU1
45
47
R674
2.2K
U509
Micro
Controller
H8/F3437
P22
81
39
Mother Board
PJ2 J7
P27P2
SW502
+5VA
4
R718
1K
C799
0.01µ
R724
100K
1
-H8_RESET
RESET
VCC
MN
P22
3
2
R725
10K
U515
D/D Board