Figure 2-1. Dc Power Distribution-Uhf Range 1 And 700-800 Mhz Radios; Figure 2-2. Dc Power Distribution-Vhf And Range 2 Radios - Motorola ASTRO XTS 5000 Detailed Service Manual

2-2
Battery
7.5 Volts
(Nominal)
Figure 2-1. DC Power Distribution—UHF Range 1 and 700–800 MHz Radios
Battery
7.5 Volts
(Nominal)
Figure 2-2. DC Power Distribution—VHF and Range 2 Radios
B+ from the battery is electrically switched to most of the radio, rather than routed through the On/
Off/volume control knob, S1. The electrical switching of B+ supports a keep-alive mode. Under
software control, even when the On/Off/volume control knob has been turned to the Off position,
power remains on until the MCU completes its power-down, at which time the radio is physically
powered down.
July 21, 2004
RF Board
J1 BATT
Fuse
RAW B+
V5A
5 Volts
SW_B+
(control signal)
3VA
3 Volts 3 Volts
Analog Circuits Digital Circuits
RF Board
J1 BATT
Fuse
V5A
RAW B+
V3A
3 Volts
SW_B+ Analog Circuits
(control signal)
V3B V3D
3 Volts 3 Volts
Misc. Supply Digital Circuits
UNSW_B+
FB+ P1
P201
1.55V
1.55 Volts
(VSW_1.55)
UNSW_B+
FB+ P1 P201
5 Volts
1.55V
1.55 Volts
(VSW_1.55)
Radio Power: General
VOCON Board
VCC5 5 Volts
SW_B+
FET
3.8 V (VSW1)
GCAP II
1.875 Volts
(VSW2)
3 Volts 3 Volts
(VREF) (V2)
MAEPF-27419-A
VOCON Board
5 Volts
VCC5
SW_B+
FET
3.8 V (VSW1)
GCAP II
1.875 Volts
(VSW2)
3 Volts 3 Volts
(VREF) (V2)
MAEPF-27520-A
6881094C31-D