NXR-901
76
■
External DC 13.8V Power Source applied to the NXR-901 Terminal
Refer to the power supply diagram sequence below.
Audio AMP (IC2
9
)
LAN_IC (IC71
9
)
DSP_I/O (IC37)
33BU
33SH
DC50
18DSP
DSP_Core (IC37)
Switch (Q302)
1.8V_AVR (IC18)
3.3V_AVR (IC32
9
)
3.3V_AVR (IC15)
3.3V_AVR (IC6)
DC/DC converter
(IC11, Q3)
Main MPU I/O (IC703)
Audio_circuit
LED, Option
RF_Control_MPU I/O (IC34)
RF_Control_MPU I/O (IC34)
Rechargeable battery (BA300)
SRAM (IC700), RTC (IC701)
Main MPU_Core (IC703)
Modem Control MPU (IC325)
TX_Vocoder/RX_DSP_I/O
(IC323/324)
TX_Vocoder/RX_DSP_Core
(IC323/324)
15DSP
33MPU
33AUD
15SH
1.5V_AVR (IC306)
1.5V_AVR (IC307)
Switched by
Modem Control
MPU (IC325)
50MPU
DC8
+B
5V_AVR (IC16)
DC/DC converter
(IC10, Q2)
Switched by
Modem Control
MPU (IC325)
■
Initialization of the Modem control MPU (IC325)
(normal oscillation of X301 and normal reset-
unlock of IC303)
Refer to Traceability procedure for IC325.
■
Unlocking “SYS_RST” Signal on the Modem con-
trol MPU (IC325) starts Up all Hardware Blocks
Refer to the Reset circuit below.
33BU
33SH
33SH
IC700
SRAM
IC71
9
LAN
IC703
Main MPU
33SH
100K
100K
100K
D16C_RST
33SH
IC708
33MPU
IC314
IC325
Modem
Control
MPU
50MPU
IC34
RF Control MPU
33SH
33SH
33MPU
IC303
33MPU
33MPU
33MPU
DSP_RST
RESET_D
IC324
TX
Vocoder
DSP
33MPU
IC323
RX
DSP
50MPU
IC35
50MPU
WP
ADSP_RST
IC37
DSP
33SH
IC17
50MPU
EEPROM
each
RF unit
33SH
33SH
IC702
Flash
50MPU
33SH
from RTE
SYS_RST
47K
33MPU
50MPU
WP
Reset circuit
TROUBLE SHOOTING
Summary of Contents for NEXEDGE NXR-901
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