Technics RS-610US - Page 6

OVERALL FREQUENCY RESPONSE ADJUSTMENT ADJUST PARTS LOCATION
NOTE: Use the test tape C-RA-30.
1. Wiring is shown in fig. 14.
2. From the LINE IN jack, supply signals 20 dB lower than the level at which the VU meter indicates O VU. Varying
nen oscillator frequency and record 40 Hz~12 kHz. LS L6
= 3. Play the tape, read output at each frequency on the VTVM and make sure that the measured value is within the 1 S L D S S
: iy range specified in the frequency response chart (fig. 15). Fi NRA | a C 6} VR14
4. If the value at 10 kHz is outside the range, adjust L5 (for CH1) or L6 (for CH2). When L5 and L6 have to be (©) VR 16 [ O
6} VR13
‘@ {
L VR12
adjusted largely, readjust playback frequency response in Step 1, placing both of them in the satisfactory condition.
5. lf frequency response cannot be made satisfactory by adjusting L5 and L6 only, check each circuit or adjust the
head azimuth adjustment.
-layback Head
Overall Frequency Response Chart
S(CH1)
6(CH2)
Vv).
DOLBY NR CIRCUIT ADJUSTMENT
Before adjustment of DOLBY* NR circuit, confirm that each value in item 7 and 8 on page 3 is within standard.
1. Place the set into the recording mode, set the DOLBY NR switch to OUT position and supply input to LINE IN jack
Note:
to
obtain
—
35
dB
at
TP3
(CH1),
and
TP4
(CH2).
(frequency
5
kHz)
The
marks
by
the
arrow
of
VR
and
coil
.
Confirm
that
the
value
at
IN
position
is
8
dB
greater
than
at
OUT
position
of
DOLBY
NR
switch.
L9
show
the
relation
between
the
direc-
. When it is not in condition above, adjust as follows.
. Set VR9, VR1O, VR11 and VR12 to maximum.
. Set the DOLBY NR switch to IN position.
.
Adjusting
VR11
(for
CH1)
and
VR12
(for
CH2),
make
the
reading
of
VTVM
at
TP3
(for
CH1)
and
TP4
(for
CH2)
become
10
dB
greater than
the
value
in
1
above.
7.
Adjusting
VR9
(for
CH1)
and
VR10
(for
CH2),
make
the
reading
of
VTVM
at
TP3
(for
CH1)
and
TP4
(for
CH2)
become
2
dB
smaller than
the
value
obtained
through
the
adjustment
in
6 above.
tion and adjustment value.
L:Large S: Small
no WD
Fig. 16
* Dolby is the trade mark of Dolby Laboratories Inc.