FRONT ch
LEVEL DIAGRAM
+20dB
+10dB
0dB
-20dB
-30dB
-40dB
-10dB
+20dB
+10dB
-20dB
-30dB
-40dB
-10dB
LINE IN/EXT IN
-10dBFS
0dBFS=1.06Vrms
-20dBFS
-30dBFS
-40dBFS
DAC:AK4490
ADC:AK5358
H/POUT
LEVEL DIAGRAM
FRONT ch
1.98Vrms=0dBFS
-10dBFS
-30dBFS
-40dBFS
200mV
+30dB
SPK OUT
+29dB
FULL SCALE LEVEL = 2.0Vrms
DOLBY LIMIT LEVEL = 1.41Vrms (ALL ch -3dBFS)
GAIN Setting of MASTER VOL 00dB
B
d
5
.
2
-
=
B
d
5
.
0
-
B
d
0
.
2
-
)
L
A
T
I
G
I
D
(
S
E
Y
:
W
S
･
･SW:YES (ANALOG
)
-2.0dB -0.5dB
+3.0dB = +0.5dB
･SW:NONE (DIGIT
AL)
-2.0dB -0.5dB +12.0dB = +9.5dB
･SW:NONE (ANALO
G)
-2.0dB -0.5dB +12.0dB +3.0dB = +12.5dB
①
②
③
④
⑤
①:Basic OFFSET
of VOL=0dB (i
ndication va
lude)
②:Fine-tuning b
y
software D
i
gital input
③:Voltage due t
o
hardware o
f
analog inp
ut
④:OFFSET of SW
NONE
+9.5dB
+12.5dB
-35dBFS(A/D IN)
-20dBFS(DIG.IN)
＋
LINE
H/POUT
TO
ZONE3
＋
SPEAKER
OUT
DSP
x2
p
cs
NJU72343
GAIN
ADJ.
PRE OUT
MUTE
TO
ZONE2
D/A
－
－
＋
PLD
AK5358
PRE OUT
276mVrms/33
Ω
4.24Vrms/8
Ω
-2.5dB
L.P.F GAIN = +0.4dB
200mVrms
Headroom:3dB
2.82Vrms:A/D FULL SCALE
-23dBFS(A/D IN)
SW:YES
-32dBFS(DIG.IN)
SW:NONE
－
-8.5dB
-8.5dB
Volume IC: NJU72343 NON CLIP MAX SIGNAL LEVEL 4.2Vrms
AD IN=75mVrms
＋
MIC IN
AD IN=319mVrms
ACM2(DM-A409)Sens
itivity:
-38.8dB/Pa=11.48
m
V/Pa at94dB
S
PL@Operatio
n Vo
ltage 5.0V
(94dBSPL is expe
cted to -11dBFS)
MIC IN
11.48mVrms
851mVrms
+37.60dB
+0.5dB
-23.7dB
150mVrms
-2.5dB
LINE IN/EXT IN
NJU72750
NJU72750
-8.5dB
NJU72750
238.8mVrms/33
Ω
+10.1dB
-6.0dB
NJU72751
AK4490
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
49
