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I
ADJUSTMENT
TEST TAPE
• STEP
MODE
ITEM
SUPPLY SIGNAL
VU Meter
1,000 Hz -5.5
dBm
15
from an
STOP
Sensitivity
Oscillator
NOTES: 1. Output Level Control should be at maxi-
mum.
2.
Except for Steps
3, 8, 9
and
10,
set Tape
Speed to 7-1/2 ips.
3. Except for Steps IO to 12 and 13, set Tape
Selector Switch to NORMAL Position.
4.
Set Bias Adjustment Volume to center
position.
5.
Use
the
following open measuring tapes::
NORMAL Tape: Maxell UD
EE Tape
: Maxell XLII
TDKSA
6.
Stop Recording bias oscillator while mak-
ing Rec Peaking adjustment (Refer to
Fig. 9-4).
ADJUSTMENT
RESULT
REMARKS
POINT
VR8 1 kB
ovu
Set MONITOR Switch
indication
to .. SOURCE"
7.
When
23.2
kHz indicates the peak, check
and ensure that the
AC
Voltmeter show
16
dB of increase when
15
kHz of input is
fed rather than when 1 kHz is fed.
8. If
it does not comply with the specifica-
tions repeat Steps
6
to
10
and
11,
and
re-adjust.
9.
Unless the core is moved intentionally
this adjustment is not necessary.
10.
Since the deviation is doubled if the dbx
noise reduction system is actuated, when
the frequency response is maladjusted and
does not agree with the reference level,
perform adjustments more exactly than so
far
been done.
- - - - - - - - - - - - - - - - S E R V I C E
MANUAL
GX-747dbx - - - - - - - - - - - - - - -
38
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