Service Modes, Error Codes, and Fault Finding
5.
DC/DC converter
Figure 5-16 DC/DC converter [1/2]
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
The volt
a
ge i
s
ab
o
u
t
+12V
while power
s
witch on
1. J1/J2 connection good
2. Check power
b
o
a
rd
The volt
a
ge i
s
ab
o
u
t
+5V
while power
s
witch on
1. Check Q27-G
a
te B
No
No
No
No
No
No
No
No
No
No
No
S
t
a
rt
J1 PIN6, 7,
8
J1 PIN 9, J2 PIN 1/2
The volt
a
ge i
s
ab
o
u
t
+5V
1. Check power
b
o
a
rd
2. Check power c
ab
le connection J1
Q2
8
PIN 7,
8
U4 PIN 5, 6
The volt
a
ge i
s
ab
o
u
t
+
3
.
3
V
1. Check U4 PIN2 EN
U2 PIN 5, 6
The volt
a
ge i
s
ab
o
u
t
+1.0V
U
3
PIN
3
The volt
a
ge i
s
ab
o
u
t
+1.2V
U1 PIN2,4
The volt
a
ge i
s
ab
o
u
t
+1.
8
V
U
38
PIN 2, 4
The volt
a
ge i
s
ab
o
u
t
+
3
.
3
V
U9, U
3
9 PIN
3
The volt
a
ge i
s
ab
o
u
t
+5V
T CON-U
3
5 PIN
3
The volt
a
ge i
s
ab
o
u
t
+
3
.
3
V
T CON-U
3
2 PIN2
The volt
a
ge i
s
ab
o
u
t
+12V
1
8
9
3
0_21
8
_100
3
10.ep
s
