Teac W-370C - Page 6

W-370C/W-375C/W-350/W-35S/W-310 Cu 1/W-300m«Il
5 ELECTRICAL ADJUSTMENT AND CHECKS
PRECAUTIONS
1.
Before
performing
adjustments
and
checks
clean
and
demag-
5.
The
AC
voltmeter
used
in
the
procedures
must
have
an
input
netize
the
entire
tape
path.
impedance
of
1
M-ohmes
or
more.
2. Make sure the deck is properly set for the voltage in your 6. Note the “Deck settings’ at the top of each chart. The settings
locality.
apply
to
all
check
for
a
specific
chart
unless
explicitly
stated
3.
In
general,
adjustments
and
checks
are
made
in
the
order
of
otherwise.
L-ch
then
R-ch.
Double
REF.
Nos.
and
test
point
designations
7.
Since
this
deck
has
an
automatic
tape
selector,
be
sure
to use
test
indicate
L-ch/R-ch.
(Example:
R11/R21)
tapes
that
have
tape
position
detecting
holes.
4. OdBis referencedto 0.775 V. tfan AC voltmeter that references
0 dB to 1 V is used, appropriate compensation should be made.
Oscilloscope
Oscillator
Distortion Analyzer
Ea
AC Voltmeter
kHz Filter
S2
a L | DECK b 2) eoek ere eae
1o
a@
@
°
O
oo
[J under Test [3s
R R
LINE IN OUTPUT
Fig. 5-1 Basic test setup
Oscitloscope
0° (IN PHASE) 45° 180°
5 90°
| !
DECK
;
under
TEST
OUTPUT AC Voltmeter
Fig.
5-2
Test
setup
for
azimuth
check
Fig.
5-3
Confirming
phase
relationship
Record/Piayback
Head
(REC/PLAY
IL)
AC
Voltmeter
Frequency
Counter
Azimuth
.
Fixed
adjusting screw
Oscilloscope
T.P on Main PCB
| DECK under TEST .
Fig. 5-4 Azimuch screw location Fig. 5-5 Test setup for bias adjustment