Sony CBK-HD01 Maintenance Manual page 23

1. Front microphone amp
The front microphone amp on the MA-162 board comes
with a gain switch. (30 dB/20 dB/10 dB)
Gain switching can be performed from the menu.
(_60 dBu/_50 dBu/_40 dBu)
2. Input signal selector
The audio signal can be selected with the analog switch
(IC1 to IC4) based on the side panel switch information.
3. A/D circuit
A/D uses 24-bit AK-5383. The sampling frequency is 48
KHz.
The first has an ATT circuit for head room level adjustment.
4. D/A circuit
D/A uses 24-bit AK-4382A. The sampling frequency is 48
KHz.
The latter has a differential LPF circuit and an output level
amp circuit.
5. Final amp
The final amp is located on the CNB-25 board and is
connected to the AXM-38 board with the connector-to-
connector. The CH1 and CH2 output signals are output
from the 5-pin XLR connector.
The output level can be selected as _3 dBu, 0 dBu, or +4
dBu from the menu.
6. Monitor amp
Composed of the monaural amp for the front earphone and
stereo amp for the rear earphone, the volume control is
Fs
64Fs
A/D OUT CH3&4 (24bit)
A/D OUT CH1&2 (24bit)
(Left Justified,24bit Data)
D/A IN CH3&4 (24bit)
D/A IN CH1&2 (24bit)
(Left Justified,24bit Data)
PDW-700/V1 (E)
23 0
MSB
CH3
23 0
MSB
CH1
23 0
CH3
MSB
23 0
MSB
CH1
32bit
A/D & D/A Signal Format Diagram
performed with the operational amp with electronic
volume (NJM2172).
7. Rear input
The rear input is composed of the following: a switch for
Line In, AES/EBU, and MIC-IN; +48 V ON/OFF-SW;
automatic detection circuit (DET-47 board) for the 3-pin
input XLR connector; and the microphone amp (10 dB/20
dB/30 dB).
Gain switching can be performed from the menu.
(_60 dBu/_50 dBu/_40 dBu)
Line In input level setting can be switched to +4 dBu,
0 dBu, or _3 dBu with the slide switch on the AXM-38
board. (Open the inside panel.)
Operation description
After the power to the device is turned on, each port in the
FP-157 board CPU is initialized, the necessary resistor data
is set, and MUTE is cancelled. (After approximately 3
seconds, the digital EE sound can be monitored.)
The front mic signal passes through the MA-162 board and
MB-1111 board before entering the input signal selector
(analog switch: IC1 to IC4) of the FP157 board.
The rear input signal passes through the AXM-38 board,
CNB-25 board, and MB-1111 board before entering the
input signal selector (analog switch: IC1 to IC4) of the FP-
157 board.
The information from the FRONT/REAR/WIRELSS
switch position can be obtained by loading the three
23 0
MSB
CH4
23 0
MSB
CH2
23 0
MSB
CH4
23 0
MSB
CH2
32bit
Fs
64Fs
AN34
AN12
DVP-45
DA34
DA12
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