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TD-X
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M,llcatctrtu
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Main Adiustments
1.
Equipment and measuring instÍumonB
used
for adjuíments
1)
Electronic
voltmeteÍ
6)
Resistor 600
Q (for íttenuator
matching)
2)Audio
frequency
oscillator
TlDistonion
meter
(bendpar§
filter)
(range:
50-20
kHz and
outpui
O
dB
dith
impedance
oÍ
600
Ol
8)Wow
flutter
meter
3)Attenuator
(impedance:
600
Q)
9)
FÍequency
counteÍ
4)Standard tape.Íor
R
EC/PB
Maxell
UDI (T99)
-
Normal{SF)
tape
r
Pow.Í
rurcG
TDKSA
-
Chmma
(SA)
tap8
-
or
equivalent
Set
the
line.voltage selector
switó to
240
V/230
V/
JVCME ,
-Metal
tape
:
22OVl127Vl12OVl110V
according
to your
local
5) Reference
tape
for
playback
(JVC
TestTape)
voltage.
VTT7l2 (for
tape
speed,
r.yow
Íluttèr
adi.)
AC 2/O V,
50/60
Hz
(TD-X321A/B)
VTT724 (for
playback
levell
,
AC 220 V,
50/60
Hz
(TD-X321
E/c)
VTT739 (for
playback
Írequency
response)
AC
t2O
V,60
Hz
(TD-X32IC/J)
vrr703L
(
10
kHz) (for
head
azimuth
8di.)
Ac
2§v
1127
v
t110
v,
50/60
Hz
(Ttlx321U)
2. Mechanism adjustment procedure
o
Notice:
O
dBs
=
O.775
(V)
Item
Adiustment
Adiusting
point
Standard
value
Remarks
Adlusting
motor
speed
1. Connect
a
frequency counter
to
the
LINE OUT terminals.
2.
Play back
the VTT712
test tape.
3.
Adjust
volume
in
motor
for
norma!
speed
at
3fi)0
Hz.
V RsO1
Normal
speed:
3000
t
15 Hz
Checking
wow
and
f
lutter
Connect
a
wow
and
flutter meterto
LINE
OUT terminals. Play back
the
VTT712
test tape.
Chèck
to
see
if
the
reading
of
the meter
is
within
O.16yo
(WRMS).
0.16%
(JIS
WRMS}
lf
the
reading
becomes moving
value even
if
confirming
to
the
standard,
a
reclaim may be
raised.
Repairs are necessary.
Checking
playback
torque
Employ
a
torque
testing
cassette
tape
for
the
checking,
or
remove
the
casette
cover
and
use a
torque
gauge.
25-7O
gr-cm
lf
the
standard
torque
is
not
ob-
tained,
replace
the
take-up
disk
assembly.
Checking
fast
forward
torque
Measure
the torque
in
the fast
forward
mode
in the
same
manner
as
in the
above.
90-150
gr-cm
lf
the
standard
torque
is
not
ob-
tained, perform the
following.
1. Clean
the
capstan
belt,
the
idler circumference,
the
motor
pulley,
the
take-up reel
disk
circumference,
the
flywheel
circumference, etc.
2.
Replace
the belt
and idler.
Checking
rewind
torque
Measure
the torque
in the
rewind
mode
in the
same
manner
as
in
the
above.
90-150
gr-cm
lf
the
standard
torque
is
not
ob-
tained, clean
the
capstan belt,
idler, motor
pulley, flywheel cir-
cumference,
rewinding idter
cir-
cumference,
left
reel disk
circum-
ference, etc.
Adiusting
Head
azimuth
1.
Connect
an
electronic voltmeter
to
the
LINE OUT
terminals.
2.
Playback
the
VTTTO3L
test
tape.
3.
Adiust
the
head
angle
with the
screw
@
until the
reading
of the
electronic
voltmeter
becomes
maximum
for
both
channels.
Screw
@
Maximum
output
(No.43O5)
15
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