57
VSX-LX51
5
6
7
8
5
6
7
8
A
B
C
D
E
F
Step 1: Check of power supply
* Turn O
N
the power of product and check the power supply by
USB iPod function.
Connect the C
N
704.
Connect the C
N
704.
N
o
Yes
In sent the
C
N
704 connector
securely
?
Check the voltage
on C
N
103 side of
MAI
N
Assy.
Yes
C
N
704 (Pins
8
,9)
C
N
704 (Pin 10)
Is
the voltage
5
V
?
N
o
5
V
input (for DSP&USB)
IC
8
01 (Pins 19,39)
USB u-COM (
V
3US)
5
V
input (for USB bus power)
1
2
N
o
Yes
In sent the
C
N
704 connector
securely
?
Check the voltage
on C
N
103 side of
MAI
N
Assy.
Yes
Is
the voltage
5
V
?
N
o
IC705 (Pin 5)
3.3
V
regulator output (
V
3D)
3
Yes
Is
the voltage
3.3
V
?
N
o
Yes
Replace of
IC705.
The output and G
N
D maybe
short-circuited.
Check the peripheral circuit.
N
o
Check the pattern between
Q
8
71 and IC
8
01.
5
Is
the voltage
3.3
V
?
N
o
IC
8
0
8
(Pins 1,40)
iPod activation IC (
V
3UI)
Check the pattern between
Q
8
71 and IC
8
0
8
.
6
Is
the voltage
3.3
V
?
N
o
Yes
Yes
IC
8
51 (Pin 16)
Logic IC (
V
3UL)
Check the pattern between
Q
8
71 and IC
8
51.
7
Is
the voltage
3.3
V
?
N
o
Yes
[6] USB/iPod Troubleshooting
Is IC705
abnormally hot
?
Q
8
71 (collector)
Local power supply for 3.3
V
USB (
V
+3DU)
4
Yes
Is
the voltage
3.3
V
?
N
o
Yes
Check the
voltage Pin 7
(USB PO
W
ER)
of C
N
701
(C
N
702) at 5
V
.
Check the
voltage Pin 4
(USB CTL)
of C
N
701
(C
N
702) at 5
V
.
Check the peripheral circuit of Q
8
71
and Q
8
72.
Replace of Q
8
71 and Q
8
72.
N
o
Is base (USB P
W
R)
of Q
8
72 high?
IC
8
02 (Pin 1)
Power supply is OK
To step 2
USB bus power (
V
5USB)
8
Yes
Is
the voltage
5
V
?
N
o
Yes
Check the peripheral circuit of
IC
8
02, and is not XFALG LO
W
?
Replace of IC
8
02.
N
o
Is Pin 4
(USBCTRL) of IC
8
02
high?
Содержание VSX-1018AH-K
Страница 8: ...8 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 2 2 SPECIFICATIONS LX51 13 3 kg 1018AH ...
Страница 9: ...9 VSX LX51 5 6 7 8 5 6 7 8 A B C D E F 2 3 PANEL FACILITIES 1 Rear panel VSX LX51 ...
Страница 10: ...10 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 VSX LX51 2 Front panel ...
Страница 11: ...11 VSX LX51 5 6 7 8 5 6 7 8 A B C D E F 3 Display ...
Страница 12: ...12 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 4 Remote control AXD7518 VSX LX51 Only ...
Страница 13: ...13 VSX LX51 5 6 7 8 5 6 7 8 A B C D E F ...
Страница 75: ...75 VSX LX51 5 6 7 8 5 6 7 8 A B C D E F ...
Страница 82: ...82 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 9 4 POWER AMP SECTION S L K R I W Y X J N ...
Страница 132: ...132 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 ...
