Motorola VHF2 Service Information page 55

VHF2 1-25W PCB 8488977U01 (rev. C) / Schematics
C5054
100n
DETECTOR_AUDIO_SEND_OPT_BRD
DNP
UNMUTED_RX_AUDIO_SEND_OPT_BRD
RX_AUDIO_RETURN_OPT_BRD
TX_AUDIO_SEND_OPT_BRD
DNP
R5042
C5051
24.K
100n
TX_AUDIO_RETURN_OPT_BRD
C5050
100n
PA_BIAS
PA_CURRENT
PWR_SET
VOX
C5046
100n
3V
R5084
C5103
0.
100n
USE NLAS4599
DNP IN MARLIN
MAX4599EXT
U515
4 NC
5
COM
6
NO IN 1
DNP
POST_LIMITER_FLAT_TX_AUDIO_RETURN_OPT_BRD
DNP
C5056
C5101
100.n
1.n
AUDIO
FLAT_TX_AUDIO_INPUT_ACCESS_CONN
C5055
3V 3V
R5025 1.u
100.K
DNP
DNP
R5044 R5063 R5064
24.K 8.2K 8.2K
DNP
C5053
100n
R5040
R5043
24.K 30.K
C5052
100n
3V
C5022
100n
1
VDDA TXRTN
2
DISC GCB3
3
GNDA CLK168
4
DACU VDDD
5
DACR U504 VDDCP
6
DACG GNDD
7 30C53
VOX GNDDO
8
PLCAP F1200
9
SQIN SYN
10
UIO VDDSYN
11
3V
VDDDAC
12
SQCAP PLCAP2
DNP
C5014 C5023 C5028 C5013
2.2u 100n
100n 1u
C5059
C5020
22n
100n
DC_POWER_ON
BW_SEL
CH_ACT
SQ_DET
LSIO
HSIO
ASFIC_CS
SPI_CLK
SPI_MOSI
F1200
C5091 R5026
uP_CLK
82.p
33.K
R5027
U507
270.K
LM2904 8 6
7
5
R5014 4
0.
C5077
1.n
DNP
R5024
9V
100.K
C5090
R5046
82.p
24.K
R5023
100.K
U506
8 2
LM2904
C5081 C5033
1
1.n 100n
3
4
C5078
1.n
3V
DNP
R5067
R5080 C5057
10. 6.2K
100n
R5034 36K
C5012
56.K
R5032
4.7u
FLAT_OR_DEEMPH_RX_AUD_SEL
36
35
3V 3V 5V
34
33
32
9V
31
R5010
30
C5075
0.
29 1n
28 DNP DNP
3V
27
R5011
26
R5088
NC 0. R5059
25
0.
10.K
DNP
C5034
100n
DNP
C5026 C5029
U507
100n 100n
R5058
LM2904
10.K
DNP 2 8
1
3
C5058
4
100n
0.
3V
R5060
10.K
C5025
100n
C5036 R5061
100.n 10.K
R5033 3V
C5024
47.K
100n
R5008
0.
R5072
4.7K
DNP
C5089 3V
R5068
82.p
R5022
6.2K
100.K
U506 R5056
R5045
LM2904 8 6
33.K 10.K
7
5
4
3V
R5057
C5032
C5088
10.K 100n
82.p
R5009 C5027
100n
0.
100.K
R5021
U509
MC14053B
6
EN
12 U505
X0
14 6 8
LM2904
X
13 11 7
X1 A
2 C5044 5
VAG
Y0
4
15 1u
Y
1 10
Y1 B
5
Z0
4
Z
3 9
Z1 C
C5087 120p
R5019
C5048 R5055
100n 10.K
2 8
3
4
VAG
C5031 C5082
C5076
100n 1.n
1.n
B+
C5049
100n
DNP
R5013
DNP
U502
R5016 7
TDA1519C
1.M VCC
9 4
INV OUT1
1
NINV
3
FILT_SW_B+
RR
8 6
M_SS OUT2
R5041
C5072
24.K 1n
C5002
47u
R5051
12.K
Q501
VHF2 (146-174MHz) DC and Audio Circuits (Sht 2 of 2)
4-15
9V
C5030 C5079
100n 1.n
RX_AUDIO_OUTPUT_ACCESS_CONN
R5086
C5003
560.
R5065
47u R5087
6.2K 100.K
16.8MHz
MOD_OUT
200K
U505
LM2904
HANDSET_RX_AUDIO_CH
1
R5066
1K
C5080
C5021
100.n
1.n
L501
1019447
SPKR+
SPKR-
L502
1019447
C5073
1n
C5097 C5098 C5099 C5100
220.p 220.p 220.p 220.p
73D02968C63-0
SHEET 7 OF 8