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I
DN.TSOF
IOIIISNTUC THE
ELECTRICAL SECTIONS
ELECTRICAL
SYSTEM ADJUSTMENT
o
Gauges necessary for
adjustment
(1)Lowfrequencyoscillator(2}Variableresistanceattenuator
(3)
Electronic
voltmeter
(4)
Oscilloscope
(5) Frequency
counter
(6)
Adjustment
driver
(7)
Trap
coil
adiustment
square
regulation
shaft
(8)
Test tape
(SONY
TY224)
(A-BEX
TCC-1 53,
TCC-130,
TCC-262811628,l.
(DENON GR-2/60)
(9)
Mirror cassette
for
playing
A-BEX
TCC-9O2)
.
Adjustment Notes
(1)
Clean
the
head surface, capstan axis,
pinch
roller'
etc' with
gauze
or
cotton
swabs soaked
with
alcohol before adjusting'
l2l
Demagnetize
the
recording head and erasure head
with
the
head eraser.
(3)
Completely demagnetize the adiusting driver'
(4)Setfunctionswitchesasfollowsunlessspecificallyindicat.
ed.
o
o
o
o
o
o
MONITOR
switch:
TAPE
INPUT
volume: Maximum (right
side)
DOLBY NR
switch:
OFF
BIAS
volume:
Center (clicking
detent in
center)
TAPE
SPEED
switch:
FIX
AUTO TUNING
switch:
CLEAR
1.
Tape playing
check
Load a
mirror
cassette
for
playing and examine
the
area around
the fixed guide
of the recording/playback
head
at
playing condi-
tion
with
lighting
and
verify that
the tape edge is not contacting
the tape
guide
part.
The tape
playing is
the most important
ele-
ment
that
determines
the capacity
of
the entire
cassette deck'
Make every
effort
to
avoid
moving
the adjusting part'
Also'
refer
to
"Adjustment
and
verification
of
mechanical
system" for
ex-
changirE
and
adjusting the recording/playback head'
2.
Azimuth adiustment
2-1
After
verifying
the tape
playback, load the
test
tape
6-BEX
TCC-153).
2-2
Playback
the test tape
and make any necessary adiustment
by
turning the azimuth adjustment nut
so
that A
and
B in
the
Lissajous
wave figure
are
at the
maximum and
minimum
levels resPectivelY.
3.
Checking and Adiusting the Tape Speed
(1)
Connect the frequency counter to the
LINE
OUT
terminal
and load test
tape
(SONY
fY-2241'
(21
Playback
a
test tape.
At
about halfway
through
the tape'
where the tape
transport
is
stable, adjust the adjustment
points
(RT107)
on
the
P.W. BOARD
12222848
006) so
that
the
frequency counter
will
have
a
reading
within
the
range
of
3,000
Hz
+6
Hz'
3.4
s
H
F
I
!
I
l r
)[
i!
l
I
I
F
Co
unt
er
TY-224
A-BEX TCC-153
Amg
16
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