B+ Main Board Routing; Figure 3.2-1. B+ Routing For Main Board - Motorola XTS 2500 Service Manual

3.2-2

3.2.4 B+ Main Board Routing

Refer to Figure 3.2-1
Raw B+ (7.5V) from the battery enters the radio through a 3-contact connector (B500). UNSW_B+
(through fuse F500), RAW_B+ and mechanical switch S501 derives power from it.
Through fuse F500, UNSW_B+ supplies to MAKO BAT_7V5 pin, MAKO BPLUS (PA CODEC block)
pin, Q700 and Q703. It is also routed to pin 3 of connector J601.
During the transmit mode, RAW_B+ feeds to U101 PA Driver, Q101 Final PA and U102 Power
Control IC.
During the receive mode, the linear regulator (U500) provides 5V to the mixer (U1) and the ABACUS
III IC (U401). U500 also provides 5V to the Frequency Generation Unit's (FGU) FracN (U201).
RFSW_B+
SW_B+
February 14, 2012
and the appropriate schematic diagram in the back of this manual.
Ferrite Bead
(E500)
Fuse B+
(F500)
Battery
TX Linear 5V
Regulator
(U500)
Digital 3V
VSW1
MAKO
Regulator
(U701)
(U502)
Analog 3V
Regulator
(U501)

Figure 3.2-1. B+ Routing for Main Board

UHF1 Radio Power: B+ Main Board Routing
Transmitter
RAW_B+
PCIC
(U102)
5V
DRIVER & PA
(Q101)
FGU
FRAC N
(U201)
5V
VSF
VCO's
Receiver
5V
Mixer
(U1)
LNA
ABACUS_3V
(Q1)
ABACUS III
(U401)
ANA_3V
ANA_3V DIG_3V
5V
UNSW_B+
5V
ANA_3V
5V
ANA_3V
5V
MAEPF-27428-O
6816985H01-F