Figure 7-35. Vhf (146-174 Mhz) Audio Circuitry Schematic Diagram (8486342Z09-A) - Motorola CP150 Service Manual

VHF (146-174 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486342Z09-A)
R511
100K
DEMOD
5V_A
C511
220pF
R518
220K
R519 C519
100K 1uF
VS_AUDIO_SEL
PWR_SET
ASFIC_CS
SPI_DATA_OUT
6880309N62-C
150 mV RMS (25 kHz) (RX)
75 mV RMS (12.5 kHz) (RX)
R516
NU
C512 C514
6.8pF 16pF
R512 R514
150K 100K
5V_A
2 8 R513
1 6 8
R515
C518
3 7
0.1uF
NU
4
5
NU
4
U510-1
LM2904 U510-2 C460
C513 LM2904 0.1uF
220pF
2.3 V
R521
100K
R517
0
VS_RAC
VOX
3V_A
C452
C451 0.1uF
0.1uF
C453 5V_A
0.1uF
C455
.022uF
BW_SEL
CH_ACT
13
GCB2 MICEXT
14
GCB1 GNDRC
15
SQ_DET
GCB0 MICINT
16
CHACT VDDRC
17
SQDET TXSND
18
LSIO LSIO 30C53 RXRTN
19
U451
HSIO AUXTN
20
CSX AUDIO
21
HSIO
CLK MOD
22
DATA RXSND
23
GNDSYN GCB5
24
LCAP GCB4
SPI_CLK
NC
C456 C457
0.1uF 0.1uF
C458
0.1uF
R451
3V 3V_A 47K
114 mV (RF)
3V
E451
BK1005HM471
C459
0.1uF
5V_B
5V 5V_A
E452
BK1005HM471
5V
E453
BK1005HM471
C497
0.1uF
3
1
2
Q520
OPT_RX_AUD_SEND_DETECTOR
OPT_RX_AUD_RETURN
R520
100K
OPT_RX_AUD_SEND_UNMUTED
OPT_TX_AUD_FLAT_RETURN
OPT_TX_AUD_SEND
OPT_TX_AUD_RETURN
3V_A
C461
1000pF
3V
R460
24K
C462 C463
0.1uF 0.1uF
C467
R474
C454 1200pF
330
0.1uF R462
24K
R464 R463
30K 24K
C464 C465
C471
3V_A
0.1uF 1000pF 2.2uF
48
NC
47
46
45
44
43
42
41
200 mV RMS
40
MOD_OUT
39
38
VS_GAIN_SEL
37
C466
NU
16_8_MHZ
F1200
1.5 V
145 mV RMS
uP_CLK
5V_B
R487
0
R481 5V_B
100K R482
180K
C483
2 8 0.1uF
C481 R491
.01uF 1
Not_Placed:NU 3
U480-1 0
4 R484
LM2904 2.2K
C482
Not_Placed:NU
2 3 .01uF
R490
2.2K
R483 C484
Not_Placed:NU
180K
Q481 .033uF
Not_Placed:NU
1 Not_Placed:NU
R486
100K
3
1
R485
2
100K Q482
3 V (UNSQ)

Figure 7-35. VHF (146-174 MHz) Audio Circuitry Schematic Diagram (8486342Z09-A)

R470
VR471 2.2K
3V_A
NC
R480
0
R472 R473
1 4
680 680
1.5 V 2 5
D471 R471
C470
2.2K
0.1uF VR472
6 3
Q472
NC
5V
C477
0.1uF
R255
3.9K
1%
BATT_CHARGE
1 4
D470
R475 L471
180K 390nH
2 5
R476 R477
100K 2.2K
VR473
NC
MMBZ5250B
6 3
Q470 20V SCI
C472 C474 C473
0.1uF 150pF 150pF
VR474
VR475 MMBZ5250B
MMBZ5245B NC
15V
C475
.022uF
0 V (RX)
1
3 V (TX)
R478
2.2K
EXT_MIC_PTT
2
C476
.022uF
J470-1
MICROPHONE CONNECTOR
R479
100K
7.5 V
SW_B+
C493 R494
C494
330K
1000pF 2.2uF
3.5 V (UNSQ)
C488
C499 6 470pF
82pF 1
MODE 3.5 V (UNSQ)
3 5
R493
INPOS OUTNEG
330K
2 8
R492 SVR OUTPOS
4
INNEG
24K
C489
7 470pF
U490 R497 R496
C492
10K
TDA8541 1MEG
2.2uF
5V_B
Not_Placed:NU
8 6
R499
C496
7 270K
1uF
5
R498
4
D491
47K
U480-2
1 6
C495 NC
NC LM2904
1uF
D492
2
0.15 V (UNSQ)
3 4
R495
5.6K
Q490
C498
1uF
7-29
RESET
1 6
2
BOOT_ENA
3 4
Q471
OPT_MIC
10 mV RMS (TX)
S2
4
S4
5
S3
6
S1
7
NC
20V M2
2
M3
3
M1
1
J471
ACCESSORY CONNECTOR
1
2
J491-2
INTERNAL SPEAKER
3.46 V RMS (RX) (0.5 W @ 24 OHMS)
June, 2005