Sony XDCAM EX PMW-EX3, Руководство по обслуживанию

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1-8
PMW-EX3
level adjustment is converted to the digital signal with
the ADC.
The digital signal receives the audio level control
processing from the DSP. After the audio signal receives
the [Wind Filter] (on/off) processing, the digital signal is
output for audio recording.
Playback output (including EE) is the digital signal that
is connected to Audio Codec where it is converted to the
analog signal with DAC and output to the ASW-66
board.
Furthermore, the audio signal that is processed for audio
monitoring in the ASW-66 board is connected to the
headphones amplifier and speaker amplifier through the
monitor level control from the AUX input of IC800.
.
C-PLD (IC804)
After the digital signal output signal from the Audio
Codec is amplified by
+ 12 dB, it is supplied to the
Display Block (Base band). C-PLD (IC804) also re-
ceives the playback output signal from the Display
Block.
The playback system selects CH1/CH2 or CH3/CH4,
connects EE, and connects TEST TONE from the
Display Block depending on the data.
Furthermore, C-PLD divides the clock signal that is
supplied from the Display Block to Audio Codec.
. Serial control
The I
2 C control from Display Block (Base band) selects
either IC800 or IC801 for the target with I
2
C MPX and
sets the register of IC800 or IC801.
HN-337 flexible board
It relays the audio signal from the DPR-289A board to the
ASW-66 board.
ASW-66 board (Audio block)
. Analog output from the DPR-289A board Audio Codec
is buffered by IC103 and is output to the A/V connector
after passing through the audio MUTE control.
.
Analog output from DAC on the DPR-289A board re-
enters into the AUX input of the DPR-289A board
AUDIO CODEC after passing through the monitor
selector/mixer (IC100, IC101, IC102), and becomes the
monitor signal.
.
Serial control
I
2
C control signal from Display Block (Base band) is
output at GPI, and performs the switching between
MONITOR [CH1/CH2] / [CH1
+ CH2] / [CH1] / [CH2]
for CH1 and CH2 respectively, and at the same time
controls the BEEP on/off.
JK-84 board (Audio block)
This is the connector board. The audio output from the
ASW-66 board is connected to RCA PIN connector.
HP-144 board (Audio block)
The headphones output signal is connected to the head-
phones jack of the DPR-289A board.
The headphones output is muted by the MUTE (Q1, Q2).
Switch/Volume control/Menu panel (Audio
controller block)
Operation panel functions relating to audio signal are built
into the following blocks.
ASW-66 board (Audio block)
For CH1 and CH2, the switches [INT/EXT] and [AUTO/
MANUAL] are connected to PIO of CPU (IC106), and the
volume control [AUDIO LEVEL] is connected to ADC of
CPU (ICl06).
KSW-54 board (Audio block)
The switch [LINE/MIC/MIC + 48] on the AXM-36 board is
connected to PIO of CPU (IC100) for CH1 and CH2
respectively. The switch [MONITOR (AUDIO)
+ / _ ] that
is common to CH1 and CH2 is connected to PIO of CPU
(IC100).
MENU processing
(1) Audio Input
. CH1, CH2 [INPUT TRIM]: _ 8 dBu to _ 65 dBu
. CH1, CH2 common [AGC Link]: Linked/Separated
.
CH1, CH2 [WIND FILTER]: ON/OFF
.
CH1, CH2 common [EXT CH Select]: [CH1] /
[CH1/CH2] selection
(2) Audio Output
. [MONITOR CH]: [CH1/CH2] / [CH1 + CH2] /
[CH1] / [CH2] selection
. [Alarm Level]: 0 to 10
. [Beep]: ON/OFF
. [BARS]: TEST TONE (DPR-289A board Display
Block internal processing)
6. System Control
DPR-289A board
The 32-bit RISC CPU (ARM) with ARM core is built-in as
the system controller (IC1600).
It has the peripheral interface functions of SDRAM, USB,
SCI, and I
2 C. It operates on a 27 MHz clock (X1600).
FLASH ROM (IC1603), SDRAM (IC1604), and EE-
PROM (IC1703) are mounted as the peripheral ICs.
It performs the system control through serial communica-
tion with IC314 of the camera block system, IC400 of the
video signal system, and IC900 of the media recording/
playback system.