(No.RA077<Rev.001>)1-45
SECTION 5
TROUBLESHOOTING
5.1
Failure diagnosis of the VCO section
5.1.1 Overview
The VCO circuit is mounted inside a BLS. BLS stands for "Board Level Shield".
This BLS has no lid and provides high shielding performance. Because BLS is not removable from circuit board by hand solder,
the components inside the BLS is unable to solder.
When there is problem within VCO circuit, the VCO cannot be repaired.
If the VCO function doesn't work, use this flow chart to identify the problem.
The following is explained about the failure diagnosis of VCO circuit inside a BLS <E1>.
5.1.2 BLS
BLS is shielding case.
BLS for VCO area is integrated type and cannot be removed.
When the parts in the BLS is problematic, it is necessary to replace the printed circuit board by the service unit in service.
Various ESN/default adjustment values are written on the service unit.
5.1.3 Prediction problem related to the VCO circuit
• PLL Unlock
<Radio state>
- Unlock beep sound
- VCO Assist voltage adjustment is impossible
<Cause>
- VCO control voltage is abnormal
- VCO assist voltage is abnormal
- VCO power supply voltage is abnormal
- VCO signal output is abnormal
5.1.4 VCO circuit inside BLS <E1> and Check point in the circuit diagram
• Unlock [Unlock beep sound / VCO assist adjustment is impossible] * Including modulation problems
VCO BUFFER
VCO BUFFER
RIPPLE FILTER
DC AMP
DC-DC CONVERTER (200C)
PLL IC
6.5V
19.1V
3.4V
ASTSW
PLL_CLK
PLL_DATA
PLL_LE
PLL_LD
10k
R39
0
R36
Q3
2SD2654/W/
L10
10
4.7u
C51
KDS160E-P
D4
470p
C49
SMV1251-079LF
D5
SSM6L36FET
Q1
BLS
E1
470p
C91
8.2k
R64
3.3k
R61
270
R63
470p
C90
56n
L22
4.0p
C93
0.1u
C92
Q6
2SC5108FT/Y/
150
R62
L21
L15
10
R44
Q4
MCH3914-H/8/
33n
L14
270n
L13
SMV1801-079LF
D10
270n
L11
0.068u
C46
15u
L5
10
R21
10M
R27
V+
5
oUT
4
IN-
3
V-
2
IN+
1
OPA170AIDRLR
IC4
SW
6
NC
5
FB
4
EN
3
VIN
2
GND
1
TPS61041DRVR
IC3
RB561VM-40
D1
680p
C27
33k
R16
0
R20
22
R17
0.15u
C44
470p
C55
SMV1801-079LF
D6
0
R51
SMV1130-079LF
D9
470p
C50
47k
R40
100k
R41
3.0p
C58
SMV1801-079LF
D7
SMV1801-079LF
D8
270n
L9
270n
L8
1000p
C53
270n
L7
1000p
C56
120
R47
5.0p
C67
1u
C70
470p
C69
47k
R43
6.8k
R42
0.75p
C59
8.0p
C61
10p
C62
270n
L17
0.5p
C72
0
R50
L6
0
R35
0
R30
0
R31
0.1u
C48
0.68u
C34
680p
C33
470k
R15
4.7u
C15
27
R7
27
R6
3.3u
C12
4.7u
C10
1k
R22
0.01u
C26
22k
R23
47
R28
R29
4.7k
R25
100k
R26
EDZV8.2B
D2
100p
C28
1u
C29
33p
C30
120k
R24
270n
L16
1u
C63
100p
C42
0
R11
0.1u
C21
100p
C20
0.01u
C17
10
R8
0.01u
C18
100p
C19
RK74HA1J101J
CP1
100p
C11
100p
C13
100p
C16
100p
C14
1k
R9
L4
10
R10
0.047u
C22
1000p
C23
0.01u
C24
10k
R12
10k
R13
0.22u
C40
0.22u
C39
100p
C38
27k
R14
100p
C37
0.01u
C36
10
R18
CLK
6
DATA
5
LE
4
TEST1
3
TEST4
2
CPVDD
1
CPVSS
24
SWIN
23
CPZ
22
CP
21
PVSS
20
BIAS
19
PVDD
18
RFINP
17
RFINN
16
VREF2
15
DVSS
14
VREF1
13
TEST3
12
TEST2
11
REFIN
10
PDN1
9
PDN2
8
LD
7
AK1541
IC2
0.1u
C78
0.1u
C81
Q5
2SC5108FT/Y/
150
R54
470p
C80
10k
R52
5.6k
R53
150
R55
470p
C79
47n
L18
6.0p
C82
TL2
$C89
100
R58
68
R57
100
R56
3.5p
C84
27n
L20
27n
L19
0.5p
C86
11p
C85
6.0p
C83
6.0p
C87
20
1.5u
C45
560
R32
10k
R33
150
R34
NX-1200
VCO circuit inside a BLS
[within the bold line square]
B
A
100k
VCO
C
Содержание NX-1200 Series
Страница 50: ...MEMO ...
Страница 62: ... No RA077 Rev 001 2 12 2 12 No RA077 Rev 001 MEMO ...
Страница 85: ...MEMO ...
Страница 86: ... No RA077 Rev 001 JKS Printed in Japan JVCKENWOOD Corporation Communications Systems Division ...