Figure 11-38. Uhf (465-495 Mhz) Audio Circuitry Schematic Diagram - Motorola EP450 Service Manual

UHF 465-495 MHz PCB 8486634Z02 Schematic Diagrams, Overlays, and Parts Lists
C512
6.8pF
R512 150K
U510-1
LM2904
R511
8
2
R513
DEMOD
1
100K
3
4
5V_A
C511
220pF
R518
220K
C519
R519
100K
1uF
VS_AUDIO_SEL
VS_GAIN_SEL
PWR_SET
VOX
BW_SEL
CH_ACT
SQ_DET
LSIO
HSIO
ASFIC_CS
SPI_CLK
SPI_DATA_OUT
VHF UHF
R513 Not Placed 100k
R515 Not Placed 0
R516 Not Placed Not Placed
R517 0 Not Placed
HKLN4216A
R516
NU
C514
16pF
R514
5V_A
100K
1
Q520
5
IMX1
C518
6
8
6 C460
R515
0.1uF
7
5
U510-2 0.1uF
4
C513
LM2904
220pF R521 R520
NU 100K
R517
3V_A
C451
0.1uF
C452
C454
5V_A
0.1uF C453
0.1uF
4.7uF
C455
10 V
.022uF
NC
13 GCB2 48
MICEXT
47
14 GCB1
GNDRC
15 GCB0 46
MICINT
16 CHACT 45
VDDRC
17 SQDET U451 44
TXSND
18 LSIO 43
30C53 RXRTN
19 HSIO 42
AUXTN
20 CSX 41
AUDIO
21 40
CLK MOD
22 DATA 39
RXSND
38
23 GND GCB5
NC
SYN 37
GCB4
24 LCAP
C456 C457
NC
0.1uF 0.1uF
C458
0.1uF
R451
47K
3V_A
3V
E451
3V 16_8_MHZ
BK1005HM471 C459
F1200
0.1uF
uP_CLK
5V_ B
E452
BK1005HM471
5V 5V_A
E453
5V
BK1005HM471
C497
0.1uF
R523
10K Audio
4
R522
2 Q520
IMX1
100K
3
OPT_RX_AUD_SEND_DETECTO R
OPT_RX_AUD_RETURN
OPT_RX_AUD_SEND_UNMUTED
OPT_TX_AUD_FLAT_RETURN
OPT_TX_AUD_SEND
OPT_TX_AUD_RETURN
C461
3V_A
1000pF
R460
24K 3V
C467
C462
C463
1200pF
0.1uF
0.1uF
R474
R462
330
R464 R463
24K
30K
24K
C464 C465 C471
R476
0.1uF 1000pF 2.2uF
3V_A
100K
C472
0.1uF
A_MOD_OUT
MOD_OUT
C466
NU
SW_B+
1000pF
5V_B
R487
C499
0
5V_B
82pF
C483
R484
C481
C482 2 8 0.1uF
R491
2.2K R492
.01uF 1
.01uF
3
Not_Placed:NU
0 24K
4
C484
Not:Placed:NU
U480-1
2 3 R490
Not_Placed:NU .033uF
LM2904 2.2K
Q481
Not_Placed:NU
Not_Placed:NU
3
Not_Placed:NU 1 R483
R485 100K
1
150K
Q482
Not_Placed:NU
2
R486
Q490 Not_Placed:NU
100K
UMG5
Not_Placed:NU
6
1
U511
5V_B
2
UMG5
3
6
4 1
R488
330K
2
3 R495
C490 4
5.6K
470pF
C498
1uF
VR471
R470
2.2K
3V_A
NC
R480
0
R472 1 4 R473
680 680
VR472
C470
D471
R471 2 5
Q472
2.2K
0.1uF
Q471
6 3
1
NC
C477
2
5V
0.1u F
3
R255
3.9K
1%
BATT_CHARGE
1 4 R475
180K
D470 OPT_MIC
R477
2 5 L471
Q470
390nH
2.2K
C474 C473 NC
6 3 150pF 150pF SCI
VR473
20V
MMBZ5250B
NC
EXT_MIC_PTT
VR474
MMBZ5250B
C475
VR475
R479 20V
15V MMBZ5245B
100K
.022uF
J470-1
R478
1
2.2K
C476 C478
2
.022uF 150pF
C494
C493
R494
MICROPHONE
330K
CONNECTOR
2.2uF
DC Level 0.3 - 0.4 V low
6
C488
C480
Supply = 7.42 R469
VCC
1/2 Supply = 3.22 470pF
U490
10
0.1uF
TDA854
1
MODE
3 5
INPOS OUTNEG
2 8
SVR OUTPOS
4
INNEG
C489
C479
GN D 1
470pF
7
R496
150pF
C492
10K
R497
Not_Placed:NU
1MEG
10uF 5V_B
Not_Placed:NU
C496
R499
D491
8 6 270K
R498
1uF
7
Not_Placed:NU
5
47K
4
C495
U480-2 R489
1uF
91K
NC LM2904
Not_Placed:NU
Not_Placed:NU Not_Placed:NU

Figure 11-38. UHF (465-495 MHz) Audio Circuitry Schematic Diagram

11-49
6
RESET
4
BOOT_ENA
J471
ACCESSORY
CONNECTOR
4 S2
5 S4
6
S3
7 S1
NC
2 M2
3 M3
1 M1
J491-1
INTERNAL
SPEAKER
1
2
3 J491-3
4 J491-4
November 24, 2003