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10.2
ELECTRICAL
ADJUSTMENTS
Adjustment Conditions
1,
2
oF
The
mechanical
adjustments
must
be
com-
pleted first.
. The head must be cleaned and demagnetized.
3. Allow
the
deck
to
age
for at least a few
minutes
before
commencing
any
electrical
adjustments.
. The reference signal is OdB=1 Vrms.
. Connect
a 50 kilo-ohm (or between
47 to 52
kilo-ohm)
load
resistance
to
the
OUTPUT
terminals.
. Unless
otherwise
specified,
the switches
listed
below are left in the positions indicated.
DOLBY
NR
: OFF
TAPE
SELECTOR
: NORM
Test Tapes
STD-331B
: Playback adjustments
(See Fig. 10-4)
STD-608A
: NORMAL
blank tape
STD-603
: CrOe2 blank tape
STD-610
: METAL blank tape
26
List of Adjustments
Head azimuth adjustment.
. Playback equalizer check.
. Playback time constant switching check.
. Playback level adjustment.
Level meter check.
. Recording level adjustment.
Oo
oo po
~]
O4B:
315H., 160nwdim
oas
0
30s
Ws
Ws
y
:
a
E
ioe
at F598
3
o e ,
0s
10s
108 __ 2048
come
[me [ease ie fe ne] ne nie
Fig. 10-4
Contents of the test tape STD-331B
Fig. 10-5
Head azimuth adjustment
Test tape
Tape selector
DOLBY
NR switch
© Due to "edge effect'', compensate the right changed by -1dB at
63Hz.
250 315 500
200
Fig. 10-6
Allowable playback frequency response zone