Pioneer GM-9127ZT-91 Panduan Servis - Halaman 32
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Halaman Cetak
1
6.1 ASL SECTION ADJUSTMENT
Preset conditions
1. Set VR401 around the center of the adjustable range.
A
Input
(MIC)
By using the jig(CAN-906,CAN-912),
apply a sine wave of 100dBSPL
voltage directly to the MIC terminal.
(Close up as much as possible.)
To connect the Amp unit and the DSP unit, use Jig GGD1153 and GGD1245.
Caution:
1) Before starting measurement, be sure to perform the initial check for the ASL adjustment jig. (The sound pressure
B
level should be 100dBSPL at the sound emission section.)
2) Note that it may take 20 seconds or more to obtain waveforms, in some cases. Do not switch off the jig soon after
starting measurement.
Conditions:
1) This adjustment is sensitive to external shocks or wind. During adjustment, keep away the product and jig from
them.
Side A
DSP UNIT
C
VR401
MIC401
D
Side A
E
CN901
+B
WFL+ WFR+
+B2
GND
WFL- WFR-
0V
13.2V
13.2V
F
32
1
2
Output
(Pin 74 : test point "ASL1")
Observe the output at
ALS1 on a audio analyzer
(Corresponding to analog
meter 7Hz).
AMP UNIT
CN906
CN901
CN902
RL+
RR+
FL+
FR+
E
RL-
FL-
RR-
FR-
13.2V
+
DC Regulated
-
Power Supply
2
3
Side B
DSP UNIT
SPD
L+
R+
N-MU
(SPD)
L-
R-
ASGD
MUTE
GM-9127ZT/EW
3
4
Adjustment
Adj.point
Spec.
VR401
100dBSPL
314±28mV
Audio analyzer
CN905
CN902
(TX+)
TXD+
TMUT
TX+
ACC
(TX-)
TXD-
TX-
(MUTE)
13.2V
4
ASL1
MIC
(MR+)
(ML+)
(MR-)
(ML-)