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1
6. ADJUSTMENT
QQ
6.1 TUNB ASSY ADJUSTMENT
3 7 63 1515 0
A
No.
Adjustment Name
Stereo Decoder ATT adjustment
1
(Input system adjustment)
Stereo Decoder Wideband
2
adjustment (Input system adjustment)
Stereo Decoder Spectral adjustment
3
(Input system adjustment).
B
Note 1 : The values for channel separation is defined as those having passed through the following filters :
100Hz – 10kHz : +0/–0.5dB
15.75kHz – 100kHz : -40dB or more
Note 2 : The adjustment No.2 and No.3 should be repeated 2 times for good adjustment.
(Steps : No.1 → No.2 →No.3 →No.2 →No.3)
C
A
TUNB ASSY
TE
L 13942296513
U301
D
C305
C329
5
3
4
1
2
R317
R316
JA301
C328
R325
or
LF
R
PYKC F4X
E
www
F
64
1
http://www.xiaoyu163.com
2
* It is not necessary to adjust the ASSY normaly when exchanging the ASSY. But the adjustment is
necessary when exchanging the Tuner Module and IC451 stereo decoder IC.
Adj. Point Measurement Point Adjustment Value
Audio ouput (L)
VR453
(Rear panel)
Audio ouputs (L/R)
VR451
(Rear panel)
Audio ouputs (L/R)
VR452
(Rear panel)
C306
C301
C302
C318
GND
Q306
R301
R328
R326
VWV
L303
D301
Fig.1 Adjustment Points (TUNB ASSY)
x
ao
y
.
i
2
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3
8
370mVrms ± 18.5mV
Best point of separation
≥30dB Note 1
Best point of separation
≥25dB Note 1
Q Q
3
6 7
VNP1963-A
TUNB
G-Link
VR452
C462
SEPA
SEPA
ADJAST
VR452
VR451
ADJAST
SPECTRUM
WIDE
NP
C313
R318
C471
C304
C465
C456
Q302
L306
R307
R306
ICT
FC
19
1
1
CN301
19
u163
DVR-220-S
3
4
2 9
9 4
Adjustment State
Input a signal of Mono 1kHz/100% modulation
to terrestrial tuner input. /through output.
Input a signal of Stereo 300Hz/30% modulation
(NR-ON/L ch only) to terrestrial tuner input.
Note 2
Input a signal of Stereo 3kHz/30% modulation
(NR-ON) to terrestrial wave input. /through output
Note 2
SIDE A
1 3
1 5
0 5
8
2 9
VR453
VR451
C467
INPUT
LAVEL
PC
C468
VR453
ADJAST
C461
Q451
GND
V+9
CN451
1
1
m
co
.
4
2 8
9 9
9 4
2 8
9 9
KN300
C
B2
E2
E
B
C2
13
13
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