Figure 7-61. Vhf (146-174 Mhz) Dc Regulation Schematic Diagram (8486769Z04-C) - Motorola CP150 Service Manual

7-62
POS
NEG
DATA
J301
BATT_CHARGE
C302
390pF
VOLUME
ON_OFF

Figure 7-61. VHF (146-174 MHz) DC Regulation Schematic Diagram (8486769Z04-C)

June, 2005
USWB+
7.5 V
F301
3A
NC
C301
390pF D301
VR301
MMBZ5250B
20V
NC
C305 C306
VR302
100pF .01uF
MMBZ5250B
20V
D3_3V
R506
S444
100
SWITCH
3 HIGH 4 2
2
R508
100K 1
1 5
SWB+
LOW
7.5 V (ON)
R507
6
100 7 0 V (OFF)
R510
330K
0 V (ON)
1 6 7.5 V (OFF)
2
3.3 V (ON)
0 V (OFF)
3 4
Q494
TP302
1
U310
TK71750S
1 5
VIN VOUT
3
CTRL
4
BYPASS
2
C304 C311
C303 C310
.01uF .018uF
33uF .01uF
D3_3V
R313
5.1K
RX_ENA
3.3 V (Rx)
0 V (Tx)
TX_ENA
0 V (Rx)
3.3 V (Tx)
7.5 V (ON)
3
0 V (OFF)
Q493
R509
100K
U320
LP2986
4 5
INPUT OUTPUT
8 7
SHUTDOWN ERROR
6 2
NC SENSE FEEDBACK
3
NC TAP
1
U330
TK71730S
1 5
VIN VOUT
3
CTRL
4
BYPASS
2
C331 C334
.01uF 10uF
VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists (8486769Z04-C)
5 V
5V
C313
C312
.01uF
10uF
Q311
C314 R310
1200pF 100K
R312 0 V (Rx)
20K
5 V (Tx)
C315
1200pF
0 V (Rx)
Q313 5 V (Tx)
R311
Q312
100K
5 V (Rx)
0 V (Tx)
C316
1200pF
3.3 V
RESET
C323
150pF
R322
100K
D3_3V
3.3 V
D3_3V
C322
R320 C321
.01uF
C320 10uF
330K
.018uF
1%
R321
200K
1%
3 V
3V
C333
.01uF
5R
5 V (Rx)
0 V (Tx)
5T
6880309N62-C