Kenwood NXR-700 Service Manual page 46

NXR-700
■ External DC 13.8V Power Source applied to the NXR-700 Terminal
Refer to the power supply diagram sequence below.
+B
■ Initialization of the Modem control MPU (IC325)
(normal oscillation of X301 and normal reset-
unlock of IC303)
Refer to Traceability procedure for IC325.
33MPU
33MPU
46
TROUBLE SHOOTING
DC8
DC/DC converter
(IC10, Q2)
5V_AVR (IC16)
Switched by
Modem Control
MPU (IC325)
DC50
DC/DC converter
3.3V_AVR (IC329)
(IC11, Q3)
Switched by
Modem Control
MPU (IC325)
3.3V_AVR (IC15)
3.3V_AVR (IC6)
D16C_RST
33SH 33SH
IC708
33MPU
SYS_RST
IC325
33MPU
Modem
Control
MPU
33MPU
IC314
IC303
RESET_D
33MPU
IC324
TX
Vocoder
DSP
DSP_RST
50MPU
33SH
1.8V_AVR (IC18)
Switch (Q302)
1.5V_AVR (IC306)
33MPU
1.5V_AVR (IC307)
33AUD
■ Unlocking "SYS_RST" Signal on the Modem
control MPU (IC325) starts Up all Hardware
Blocks
Refer to the Reset circuit below.
33SH 33BU
IC700
IC703
SRAM
Main MPU
33SH
50MPU
from RTE
33MPU 33SH
IC323
IC17
RX
DSP
Reset circuit
Audio AMP (IC29)
LED, Option
RF_Control_MPU I/O (IC34)
LAN_IC (IC719)
RF_Control_MPU I/O (IC34)
DSP_I/O (IC37)
18DSP
DSP_Core (IC37)
33BU
Rechargeable battery (BA300)
SRAM (IC700), RTC (IC701)
Main MPU I/O (IC703)
15SH
Main MPU_Core (IC703)
Modem Control MPU (IC325)
TX_Vocoder/RX_DSP_I/O
(IC323/324)
15DSP
TX_Vocoder/RX_DSP_Core
(IC323/324)
Audio_circuit
33SH 33SH 33SH
IC719 IC702
LAN
Flash
50MPU 33SH
IC34
RF Control MPU
50MPU 50MPU
WP
IC35
50MPU 50MPU 33SH
WP
EEPROM
IC37
each
DSP
RF unit