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5.6
Playback Noise Measurement
NS ORF
5.9 Alignment Points
1. Set the selector switch to NORMAL and NR switch to
ae
ae
side
40Hz
250Hz
lOKHz
12 SKHz
2. Play back the blank tape and make sure that the noise
:
volume is below 2mV when the REC LEVEL Knob is
set to both maximum and minimum.
DOLBY BNR
1. Perform measurements when the power hum is at mini-
250Hz
IOKHz
12. 5KHz
Hi ay "
mum.
e
4
>
2. Perform
measurements
under conditions
where induc-
Cin
ee
>
O F
le
tion noise will not affect measurements.
:
ok
=
[CrO,]
us jens
@
seat
5.7 MPX Filter Adjustment
1. Set the tape selector switch to CrO2.
N
iy
1. Adjust the tape selector switch to NORMAL.
2. Insert the AC-512 test tape in the cassette holder and
Tes
2. Put the blank tape in the cassette holder, and set the
set the recording conditions. Attenuate from 500mV to
;
:
we
MPX Filter: ON)
—25dB on Line Out
with the attenuator and record at
A
Po
BIOs ies tie Source pastsiore.|
nats
1kHz, 10kHz, 12.5kHz and 15kHz on an unrecorded
ey
ony
3. Add a 1kHz, —20dB signal to LINE IN. Adjust the Rec.
section of the tape.
aN
<
NG
gm
Volume knob r0 OgB Level Meter reading.
-
. Record
and
playback
at 1kHz,
10kHz,
12.5kHz
and
dR,
f
mo
Fr
4. Set the input signal at 19kHz +10Hz. Adjust L602(L)
15kHz.
Make sure results comply with the following
f ng
a:
Ze is
and LG61(R) to the minimum level.
If the value
is 40dB or more, the adjustment
is com-
pleted.
Mode: record
diagram.
NR "OFF"
8dB
1OKH
z
12, 5KHz
ISKHz
NR
"ON"
[fe
|
i
250Hz
1OKHz
12. 5KHz
Se,
TILLY,
a,
rt
;
r
é
SSO.
z
Mea
se
[METAL]
1. Adjust the Tape Selector Switch to METAL.
2. Load the test tape AC-712 into cassette holder. Perform
measurements
as with CrO., and make sure they con-
form with the Chart.
5.8 Record/Playback Frequency Response and
Record Level Adjustment
[NORMAL]
. Set the tape selector switch to NORMAL.
. Set the MPX filter to OFF and Dolby NR to Dolby B.
3. Insert the AC-212 test tape in the cassette holder and set
the recording
conditions.
Set the monitor switch to
SOURCE
and attenuate from 1kHz, 500mV to —25dB_
lOKH>
on Line Out.
12.5KHz
4. Set the monitor switch to TAPE
and adjust RLO7(L)
and RLO8(R)
so that the level for 1kHz and 10kHz is
brought within +0.5dB.
6. After making these adjustment, record and playback at
NOTE:
1kHz, 10kHz,
12.5kHz.
Make sure results comply with
the following diagram.
Adjustment
points
for
NORMAL,
CrO,,
METAL
are
common with CB01(L) and CB02(R).
_
NR "OFF"
nN
8dB
ISKHz
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