Figure 6-12. Vhf (146-174 Mhz) Pcb 8486342Z13-C Dc Regulation Schematic Diagram - Motorola EP450 Service Manual

6-14
J301
POS
NEG
DATA
BATT_CHARGE
C302
390pF
TP302
1
VOLUME
ON_OFF

Figure 6-12. VHF (146-174 MHz) PCB 8486342Z13-C DC Regulation Schematic Diagram

November 24, 2003
VR301
F301
MMBZ5250B
3A D301
C301 NC
390pF
20V
VR302
MMBZ5250B
C305 C306
NC
100pF .01uF
20V
D3_3V
R506
S444
100
SWITCH
HIGH 4
3
2
R508
1 5
100K
SWB+
LOW
R507
100
6 7
Q494
R510 6
1
330K
2
3
4
DC Regulation
USWB+
U310
TK71750S
1 VIN 5
VOUT
3
4 CTRL
C303 C304
BYPASS
GND
.01uF
33uF
2
C310
.01uF
D3_3V
R313
10K
RX_ENA
TX_ENA
Q493
2 3
R509
1
100K
U320
LP2986
4 5
INPUT OUTPUT
8
SHUTDOW N
7
3
NC ERROR
SENSE
6
2
NC
TAP FEEDBACK
GND
1
U330
TK71730S
1
VIN VOUT 5
3
CTRL
4
BYPASS
GND
C331
2
.01uF
146-174 MHz Schematic Diagrams, Overlays, and Parts Lists
C312
C311 C313
.018uF 10uF .01uF
Q311
C314
R310
100K
1200pF
R312
Q313
20K
C315
1200pF
Q312
R311
100K
C316
1200pF
C323
150pF
R322
100K
D3_3V
C321 C322
C320
R320
.01uF
330K 10uF
.018uF
1%
R321
200K
1%
C333
C334
.01uF
10uF
5V
5R
5T
RESET
D3_3V
3V
HKLN4216A