(No.RA053<Rev.001>)1-161
5.5
Failure diagnosis of the VCO section (NX-3320)
[Overview]
The VCO circuit is mounted inside the BLS. BLS stands for "Board Level Shield".
This BLS has no lid and provides high shielding performance. Because BLS is difficult to solder, components inside the BLS can't be
soldered.
When there is a problem with the VCO circuit, the VCO can't be repaired.
If the VCO function doesn't work, use this flow chart to identify the problem.
The following is explained about failure diagnosis of VCO circuit inside a BLS<E101>.
[About a BLS]
BLS is shielding case
BLS for VCO area is integrated type and can not be removed
[Prediction problem related to the VCO circuit]
• PLL Unlock
<Radio state>
- Unlock beep
- VCO Assist voltage tuning is impossible
<The cause>
- VCO control voltage is abnormal
- VCO Assist voltage is abnormal
- VCO power supply is abnormal
- VCO signal output circuit is abnormal
[VCO circuit inside a BLS<E101>]
ASTS
W
ASSIST
CV
/SAVE
C
P
CPZ
/SAVE
VCO_H_/
L
50C
50C
VCO_MOD
$C155
R122
5.6k
C132
47p
L154
5.1
n
LR79Z0GJ5N1
G
$D101
R154
150
(D)
R120
470
k
$C101
R15
1
100
k
$C16
8
$ Q 1 0 1
$C169
$R101
R 1 0 2
0
$C170
C 1 0 3
3 3 p
R 1 5 5
4 . 7
B F U 6 6 0 F
Q 1 5 1
R123
470k
C102
0.01
u
C165
0.1u
Q 1 1 4
V T 6 M 1
C 1 6 6
2 . 5 p
(B)
D111
1SS400S
M
C 1 5 3
1 3 p
(G)
R10
3
22k
L156 150
n
(-53)
I C 1 0 2
B U 7 2 9 5 H F V
1 IN+
2 VSS
3 IN-
4
oUT
5
VDD
L 1 1 1
LB73H0AY-0 04
D132
BB555-02VH
D133
BB555-02V
H
C10
7
100p
C 1 0 4
1 0 0 p
D135
BB555-02VH
D 1 3 4
BB555-02VH
$ C 1 8 0
D131
BBY58-02V
$ C 1 7 9
R 1 26
0
R130
150
C113
1u
10
C 1 0 6
0 . 1 u
C135
47p
$C171
R136
0
R109
4
7
R156
0
R 1 2 7
0
$R113
R125
0
C122
10u
R111
4.7k
C112
4.7
u1
0
C 1 3 4
2 p
(B)
L134
L3C-0002-0
0
R E 1 E 0 0 2 S P
Q 1 1 1
2 S D 2 6 5 4 / W /
Q 1 1 3
R 1 2 4
2 2 k
$C137
D102
EDZV8.2B
R134
120
(D)
I C 1 0 1
O PA 1 7 0 A I D R L R
1 IN+
2 V-
3 IN-
4
oUT
5
V+
$C14
6
Q 1 0 2
E M 6 M 2
$C149
$ C 1 4 7
R 1 3 5
8 . 2
B F U 6 6 0 F
Q 1 3 1
C148
0.1u
C123
0.047u
CK73FB1H473
K
R 1 0 6
1 0
C 1 4 5
1 p
(B)
C121
0.15u
CK73FBB1H154
K
C 1 3 3
1 3 p
(G)
L136 100n
(-53
)
L138
100n
(-53
)
L137
100n (-53)
C141
2.5p
(B)
C143
4p
(B)
R181
100
C 1 4 2
4 p
(B)
R133
5.6k
(D)
C150
47p
C139
47
p
R118
470k
R 1 1 2
1 k
C140
0.33u
C111
47p
R119
470k
R129
10k
C144
47p
L133
4.7
n
LR79Z0GJ4N7
G
Q 1 1 2
V T 6 M 1
R121
10k
R132
10k
(D)
L158
150n
(-53
)
L157
150
n
(-53)
C16
3
3.5p
(B)
C162
7p
(B)
C108
0.1u
C 1 6 1
9 p
(B)
C N 1 0 1
R152
5.6k
(D)
R104
1
k
C167
47p
C 1 0 5 1 u
50
2 S C 5 1 0 8 F T / Y /
Q 1 8 1
C159
47p
R182
10k
C160
0.33u
R183
6.8k
C164
47p
L 1 3 1
1 0 0 n
( H 0 A M )
R153
10k
(D)
C 1 3 6
3 p
(B)
L132
100n
(H0AM)
C181
47p
C 1 5 7
3 p
(B)
L 1 5 1
1 0 0 n
( H 0 A M )
R184
220
L152
100n
(H0AM)
C158
0.5p
L181
10n
LK73H0AM10N
J
R110
100k
C151
4
p
(B
)
C18
2
47p
R107
100k
L153
100n
(H0AM
)
R131
100k
C152
47p
C138
0.5p
C 1 8 3
3 p
(B)
D155
BB664-02V
R117
2
2
D 1 5 4
BB555-02VH
R 1 0 8
1 0 M
D151
BBY58-02V
E 1 0 1
F 1 B - 0 0 9 5 - 0 0
R114
47k
D152
SMV1
130-079
LF
C131
1p
(B)
L135
100n
(H0AM)
L 1 2 1
LB73H0AY-0 04
R 1 0 5
1 2 0 k
D15
3
SMV1
130-079
LF
L 1 1 2
LB73H0AY-0 04
R116
22
R 1 2 8
3 9 0
(D)
C154
47p
R11
5
0
C 1 5 6
4 p
(B)
L15
5
L3C-0001-0
0
R137
0
R13
9
0
Q 1 0 3
V T 6 M 1
R14
0
470
k
R14
1
470k
$L159
L3C-0003-0
0
$ C 1 1 4
C 1 1 5
0 . 5 p
(B)
C109
13p
(G)
C110
5p
(B
)
R143
27k
R 1 4 2
2 2 k
$R144
Q 1 1 6
S S M 3 K 1 5 A M F V
C11
6
3
p
C117
0.75p
Overlap
Overlap
BLS
ASSIST
CV amp
Overlap
4.3V
3.2V
3.9V
VCOH
VCOL
$ Q 1 15
VCO circuit inside a BLS (in a dotted line)
[A]
[B]
[C]
[D]
[E]
[F]
[G]
[H]
[ I ]
[J]