Sony PMW-EX1 Service Manual page 14

. The DC-DC converter (IC1, Q1) for microphone power
+48 V is built-in, and when EXT MIC +48 V is going to
be supplied, the EXT MIC +48 V is supplied by the
switch (Q301, Q302, Q321 and Q322).
. The audio input signals from MIC and LINE are input to
a common circuit that receives both of the MIC input
level (_8 dBu to _65 dBu) and the LINE input level (+4
dBu). The input attenuator is inserted in the circuit
switch (Q103 to Q105, Q203 to Q205) as required. This
audio input signal is received by the balanced input
amplifier (IC102, IC202) that performs amplification of
0/+12 dB and switching (Q110, Q111, Q210, Q211) in
accordance with the level that is set by INPUT TRIM.
After that, the audio signal is connected to the [INT/
EXT] switch (IC105, IC205).
. The [INT/EXT] switch (IC105, IC205) performs not only
the INT/EXT switching but also performs the input
channel mode selection [CH1/ (CH1/CH2)].
. SEL/AMP (1, 2) is a signal selector and buffer amplifier
to perform AGC link.
MA-161 AU-313
Q5,Q7,Q9
INT MIC1
with
HEAD AMP
+12dB
Q6,Q8,Q10
INT MIC2
with
HEAD AMP
+12dB
Q103 to Q105, Q301,Q302
MIC/LINE1
(XLR) -24
+48V /MIC / LINE -1
Q203 to Q205,
Q321,Q322
MIC/LINE 2
-24
(XLR)
+48V /MIC / LINE -2
AXM-35
AV Monitor
MUTE
Out1
(Line Out1)
AV Monitor
Out2
MUTE
(Line Out2)
JK-77
Q11
MUTE
HP Out
(PHONE
Q12
MINI)
MUTE
CN11
SPEAKER
LED-465
PWR or
ASW-65
1-6
INT/EXT1,INT/EXT2
MIC/LINE/+48V-1, IIC to
MIC/LINE/+48V-2, GPIO
COPY1to2, LINK2to1, LINK1to2
IC401 to
BAL
IC404
AMP
IC101
INT/
EXT 1
IC103,
BAL
IC104
AMP
IC201
SEL/
AMP1
IC105,
IC205
+48V
Linked/
BAL
Separated
AMP
IC102
IC203,
Q110,
IC204
Q111
(GAIN SEL
CH1) SEL/
+48V
AMP2
BAL
AMP
IC202
INT/EXT 2
Q210,
Linked/
CH1 CH1/CH2
Q211
(GAIN SEL Separated
CH2)
AMP
Q103
AMP
IC100,
Q104
IC102(1/2)
SEL/
MIX1
MONI CH-1
MONI CH2-1
SEL/
IC101,
MIX2
IC102(2/2)
MONI CH2-2
MONI CH2-2 BEEP
Q100 to Q102
MUTE
DET
IC104, IC105
MONI1-1,2-1,
MONI2-2,2-1,
GPIO
BEEP,
MUTE
Fig. 1. Audio block diagram
. Serial control
2
The I C control signal from Display Block (T-one) is
converted into GPI, and performs switching such as
[INT/EXT], [LINE/MIC/MIC+48], [CH1/ (CH/CH)],
and AGC [Linked/Separated] for CH1 and CH2.
DPR-289 board (Audio block)
The AU-313 board is comprised of two pieces of the
Audio Codec IC and the C-PLD.
. Audio Codec (IC800, IC801)
The analog audio signal from the AU-313 board is
connected to IC800 and IC801 that are the Audio Codec
(PGA, ADC, DSP, Digital IF, headphones amplifier,
speaker amplifier are built on one chip and the parame-
ters are set with I
The Input TRIM (PGA) functions in the [MANUAL]
mode, and AGC functions in the [AUTO] mode to
control the audio signal level. The analog signal after
DPR-289
(1/2)
IC800(1/2)
PGA
GAIN
I2S
FIL AGC LVL
A/D
AUDIO IF
PGA
GAIN
D/A
PGA
GAIN
I2S
A/D FIL AGC LVL
AUDIO IF
PGA
GAIN
D/A
IC801
IC800(2/2)
AMP
AUX IN( L)
MIX
AMP
AUX IN( R)
AMP
+
AMP
MONITOR LEVEL
IC800
IC803
I2C MPX
(DEVICE CONTROL)
2
C).
Display
Block(T-on)
I2C
IC804
C-PLD
Digital Audio
OUT 1
DP_O_CAM_
AU_DT12O
Recording
(DP_O_CAM
signal
_AU_DT34O)
Digital Audio
IN 1 or 3
CLOCK DIV
(1fs,64fs,256fs)
CLOCK DIV
(1fs,64fs,256fs)
GAIN MAKE
OUT 2
DP_I_CAM_A
U_DT12O Playback
DP_I_CAM_A
signal
U_DT34O
Digital Audio
IN 2 or 4
CLOCK DIV
(1fs,64fs,256fs)
LINE 3/4
BEEP
(T-one)
Display
I2C Block
(T-one)
I2C
PMW-EX1