v
2-11
OVERALL
FREOUENCY
RESPONSE
{9'5cm
a. Specification
500
Hz 0
dB
(-10
dB), 10
KHz+2
d8,35
Hz
t3
dB
b.
Adjustment
Adjust
the trimmer
capacitors
C-604
and
C
606.
c.
Reference
Refer
to
Fig.
6-1,
d. Test
tape,
special tools
and
instruments
required
B
lank
tape
(Scotch
#212,
Maxell
#U
D 35), signal
generator
and
VTVM
'
e. Test
point
Connect
the
VTVM and
oscilloscope
to the
line
output
jacks.
f. Mode
of switch
('l
)
TapespeedSW-9.5cm/s(buttonin),MonitorSWTAPE,EqualizerSWNORMAL,RecordSW-ON'
(21
P.B.
level controls-lvlAX,
Record
level
controls-MAX.
g.
Procedure
(1)
Connectthesignal
generatortothelineinputjacks,andapplya500Hzsignal
of-30dBtothelineinputs.
(2)
Atter
above
connecrions
are
completed,
load the
blank
tape
(Scotch
#212i)
on the
deck and
push
the
record
button
and
play
button
simultaneously
to
enter the
record
mode.
(3)
Adjust
the trimmer
capacitors
C-604
and
C-606 on
the
REC
switch
PC Board
(PCM-397)
by
sweeping
the
frequency, so that
the
line
output
level of the
frequencies
between
500
Hz and
10 KHz
is in the
range of
-10clB
!2dB.Andcheckthatthelineoutputlevel
of
thefrequenciesbetween500Hzand35Hzisinthe
range of
-1
0
dB
t3
dB.
(4)
Change
the
equalizer
switch
to SPECIAL
(button
in)
position
and
load
the
blank tape
(Maxell
#UD-35)
on the
deck.
Then
enter
the
record
mode to
eheck
frequency
response
for special
tape.
(5)
Check
that the
Iine
output
level of
the
frequencies
between
500
Hz and
10
KHz is
in the
range
of
!3
dB
in
reference
to the
level
(500
Hz
-
10
KHz
-10
dB
t2
dB)
and
also that
the
line
output
level
of the
frequencies
between
500
Hz and
35 Hz
is in the
range
of
t3
dB in
reference
to the
level
(500
Hz
-
35
Hz
-10
dB
13
dB).
v
2-12
OVERALL
FREOUENCY
RESPONSE
(19cm/
a. SPecification
TOOHz0dB
(-10d8),21
KHz!2
d8,30
Hz13dB
b.
Adjustment
Adiust
the
peaking
coils
L-'l 01
and
L-201.
la
c.
Reference
Refer
to Fig. 6
1.
d.
Test
tape, special
tools
and
instruments
required
Blank
tape
(Scotch
#212,Maxell
#UD-35),
signal
generator and
VTVM'
e.
Test
Point
Connect
the
VTVM and
oscilloscope
to
the
line
output
iacks'
f
.
Mode
of switch
(1)
Tape speed
SW-19
cm/s,
Monitor
SW-TAPE,
Equalizer SW-NORMAL,
Record SW-ON.
(2)
P.B. level
controls-N'lAX,
Record
levei controls-MAX'
g.
Procedure
(1)
Connect
the
signal
generator
to the
line
input
jacks,
and
apply
a
TOOHz
signal
of-30
dB
to the
line
r n
puts.
(2)
After the
above
connections
are
completed,
load
the
blank tape
(Scotch
f,
212\
on the
deck
and
push
the
record
button and
play
button
simultaneously
to enter
the
record
mode.
(3)
Adjust the
peaking
coils
L-101
and L-20'1
on the
AMP
PC Board
(PCM
446)
by sweeping
the
frequency,
so that
the
line output
level
of
the
frequencies
between
7OO Hz and
21 KHz
is in the
range
of
-10
dB
g
!2
dB.
And check
that
the
line
output
level of
the
frequencies
between
700
Hz and 30
Hz is in the
range
of
-10
dB
t3
dB.
(4)
Change
the
equalizer
switch
to
SPECIAL
(button
in)
position
and
load the
blank tape
(Maxell
#UD-35)
19
To Next Page
Loading...