Power Supply; Dmr Receiving; For Digital Data Mode - Kenwood TK-D240 Service Manual

2.3.7 Power Supply

There are five 5V power supplies and five 3.3V power supplies: 50M, 50V, 50C, 50R, 50T, 33M, 33MS, 33B, 33R and 33MD.
33MS is always output, but turns off when the power is turned off, to prevent a malfunction of the MCU.
50C is a common 5V.
50R is 5V for reception and is output during reception.
50T is 5V for transmission and is output during transmission.
50V is 5V for the SP/MIC connector.
33B is 3.3V for the baseband IC (IC705) digital supply.
33C is 3.3V for the IF IC (IC400).
33MD is 3.3V for the MCU digital supply.
BATT
GND
SW
SBC

2.3.8 DMR Receiving

2.3.8.1

For Digital Data Mode

The demodulated signal from IC400 (Pin13) is fed into the baseband IC (Pin 16) for DMR decoding. The decoded digital data will pass
to the MCU through the C-BUS. The MCU determines whether or not to output sound from the speaker by checking if the data match-
es.
F600
2.5A
SB2
IC650
DC/DC
IC710
MCU
5RC
50CC
50VC
SBC
VDD1-VDD6
RESET
33MSC
Fig.9 Power supply
IC603
AVR
50VC
IC602
AVR
IC606
AVR
50CC
IC601
AVR
SBC
Q601
SW
5TC
Q602
SW
5RC
IC703
AVR
IC715
AVR
IC604
AVR
IC605
DET
+B
50V
50C
33C
50M
50T
50R
33B
33MD
33M
Q606
33MS
SW
(No.RA035<Rev.001>)1-11