1-68
HDW-750/750CE V1
AXM-24
CNB-15
KY-475
AL-43
MB-898
RX-54
CN403
CN401
CN117
CN117
CN401
CN109
CN109
CN402
CN207
CN205
CN205
CN204
CN204
STBY/SAVE
OFF/ON-PAGE
LOW/M/HIGH
PRST/ITEM
PRESET A/B
DCC-BRA
CN203
CN203
CN202
CN202
CN206
CN301
CN301
CN302
CN207
CN107
CN107
CN208
CN106
CN106
CN105
CN105
CN120
CN504
CN503
LENS
CN502
CN501
CN501
OUT
CN120
CN201
CN201
TEST
FP-121
HP-104
PCF8574
PCF8574
SPEAKER
3
3
I
2
C
I
2
C
I
2
C
I
2
C
MIC
IN
IN
IFA-11
TURBO_GAIN_SW
ASSIGNABLE_SW1
ASSIGNABLE_SW2
APR-59
DCP-28
DVP-18
PCF8574
X24C02P
HP-103
MS
FAN
ENC-61
SW-1038
VTR START
AUTO W/B BAL
SHUTTER
MIC CONT
PSW
SW-1031
MA-103
Fig.1 Audio system, frame diagram
1-26. Circuit Description
1-26-4. Audio System
1-26-4. Audio System
(FP-121 Board, IFA-11 Board, APR-59 Board, AL-43 Board,
and AXM-24 Board)
The audio system consists of the following blocks.
.
Front microphone block (IFA-11 Board)
.
Signal switch block (FP-121 Board)
.
CH1, CH2 manual control block (FP-121 Board)
.
AGC and amplifier block for CH1 to CH4 (FP-121 Board)
.
A/D converter block for CH1 to CH4 (FP-121 Board)
.
Delay processing block (APR-59 Board)
.
Monitor amplifier block (APR-59 Board)
.
D/A and filter block (FP-121 Board)
.
OUT_Limiter and amplifier block (FP-121 Board)
.
Final stage amplifier block (AL-43 Board)
.
Rear input block (AXM-24 Board)