Logic Circuits; Power Supply Circuits - Icom IC-R9500 Service Manual Addendum

3-3 LOGIC/LOGIC-A UNIT
LOGIC/LOGIC-A UNIT generally controls the whole of the
circuit of the IC-R9500, and processes audio signal.
MAIN CONTROLLER
Two CPU's; IC103 (CPU1) and IC604 (CPU2) communicate
each other via the dual port SRAM (IC51). As the external
I/O port for these two CPU's, CPU1 has CPLD (IC52) and
CPU2 has CPLD (IC605) to control each in/output. An
external SDRAM is connected to the CPU1 for work space.
On the MEMORY BOARD, two FLASH ROMs (IC1 and IC2)
are mounted for storing program, image and audio fi les.
VIDEO, AUDIO AND USB PROCESSOR
IC203 is a processor for video, audio and USB, and each
data is stored in SDRAM (IC201, IC202).

3-4 POWER SUPPLY CIRCUITS

Voltage from the power supply is routed to the whole of the receiver.
• VOLTAGE BLOCK DIAGRAM
AC
AC-SW
IN
SW
VDD15V
REG
REG
SW
15V
REG
REG
REG
REG
REG and DCDC UNITS
H15V
AC-DC
LG_PWR
VDD3R3VA
VDD3R3VB
VDD15V
REG
REG
PWRS
3R3VA
3R3VB
28V
–12V
REG
REG
LAN DRIVER
LAN driver IC (IC404) conduct the LAN communications via
the pulse trans (T401). The EEPROM (IC403) stores the
settings for LAN connection.
COMPACT FLASH
IC402 is the power controller for inserted compact flash
card, and its output voltage is selected from 5V and 3.3V.
VIDEO SIGNAL PROCESSOR
IC856 is a video encode/decode IC and converts the analog
composite video signal to digital video signal, and converts
the digital video signal into analog RGB video signal.
A portion of the video signal (RGB) is output to the FRONT
UNIT, and other is converted into the analog RGB signal and
output from the J803.
REG
VDD5V
LOGIC
CIRCUITS
VDD1R2V
8V
5V
LOGIC/LOGIC-A UNIT
3 - 5
FRONT
PWRK
H3R3V
CPU POWER SW
H5V
REG
H15V
FRONT UNIT
ANALOG
CIRCUITS
FRONT