Sony DWT-B30, Руководство по обслуживанию

Страница: 42 / 98

4-10 (E)
DWT-B30
4-2-3. Audio Circuit Performance Check
Connect DWR-R03D to this unit and perform the check procedure in this section.
If there is any problem, a failure in the following circuit may have occurred. Perform the check focusing
on this path.
.
Audio input terminal → CN500/TX-172 board → IC504 (Head Amp)/TX-172 board → IC570 (A/D
Converter)/TX-172 board → IC201 (FPGA)/DPR-396 board
In case that the sound is output only when INTERNAL SG in MENU is set to ON, a failure has occurred
in the path before IC570.
Required equipment
.
Audio analyzer
.
DWR-R02DN/R03D that works properly
.
Audio measurement cable
Connection
Measurement items (Measurement by AES/EBU output)
Item Specification Condition
Output level
_
36 dBFS
?
1.0 dB
ATT = 0 dB,
_
58 dBu, 1 kHz, sin wave
_
20 dBFS
?
1.0 dB ATT = LINE, 4 dBu, 1 kHz, Sin wave
Frequency characteristics
+
0.2 dB/
_
0.5 dB
1 kHz reference, 20 Hz to 22 kHz, Filter: OFF
Maximum input level
_
22 dBu
?
1.0 dB ATT = 0 dB, T.H.D: 1%, 1 kHz, Sin wave, LPF: <22 kHz
Noise level
_
106 dBFS or less
ATT = LINE, A-weight, 150
Z
terminator
Distortion rate (T.H.D)
*
1
0.03 % or less ATT = 0 dB,
_
43 dBu, 1 kHz, Sin wave, LPF: <22 kHz
*
1: When T.H.D cannot be measured, use the following as substitute.
Item Specification Condition
T.H.D
+
N 0.05 % or less ATT = 0 dB,
_
43 dBu, 1 kHz, Sin wave, LPF: <22 kHz
For the connection and setting procedures for the case of using DWR-R02DN, refer to the Service Manual
of DWR-R02DN.
Audio analyzer
AES SUBOUT1
(XLR)
Audio measurement cable
DWR-R03D This unit