Denon DR-F7 - Page 20

Dolby Ο Record/Playback Overall Frequency Response.
Tape : XLII, DX3, DXM
Tape Select : CrO;, NORMAL, METAL
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20 50 100 200 500 1K 2K 5K 10K 20K (Hz)
9. Adjusting the FTS Section (DR-F7/F8)
(1) Adjusting the FTS test signal, oscillator
1)
Supply
a
—38
dB,
1
KHz
signal
to
the
LINE
IN
(L)
terminal and read the level at the REC OUT (L)
terminal.
2) Press the FTS START button to switch over to
the FTS test signal. Adjust Vr 104 so that the level
after the switch-over is the same as the value read
REC Amp
in 9-(1)-1).
3)
Supply
a
—38
dB,
12
KHz
signal
to
the
LINE
IN
Br
(R)
terminal
and
read
the
level
at
the
REC
OUT
(R)
terminal.
4) Press the FTS START button to switch-over to the
FTS test signal. Adjust Vr 204 so that the level
after the switch-over is the same as the value read
in 9-(1)-3).
(2) Adjusting the reference level of the FTS comparator
raue
COMP
Amp
Supply a —38 dB, 1 KHz signal to the LINE IN termi-
nal
and
adjust
Vr
302
so
that
the
level
at
the
test
point
fect
NEN
_
TP 31 is set immediately after H — L or L — H alter-
ation.
1ΚΗς
TP
(3) Checking the FTS operations
1) Set the TAPE SELECT switch to the NORMAL
position and load a tape (LX-C60).
2) Light up the PRESET LAMP, setting the unit in
the PRESET mode. Record and play back 1 KHz
and 12 KHz signals at —38 dB, and take a note of
the trequency response.
3) Press the FTS START button. After completion,
(check the lit FTS lamp) record and play back the
1 KHz and 12 KHz signals at —38 dB. Check to
make sure that the frequency response is improved
when compared to the ones noted in 9-(3)-2).
REC Amp
LINE IN
Lo
LINE OUT
PB Amp
© Beat Interference
Beat interference may result if the unit is used close to an
AM tuner. In this case separate the distance between the
tuner
and
the
cassette
deck.
2