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Adj ustm
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CF
1
MKII
Adjustment
Preparations
Adjustment Procedure
1
l.Frequency
response on
Playback
Con nect the
AF-voltmeter
to
test point l,)
Dl
(left
channel)
or
test
point,i.r
D2
(right channel)
on the audio
circuit
board.
lnsert test cassette
448
A.
Play
back
the 315
Hz
I
12.5 kHz
frequency recording
on
the
tape.
Dolby
off.
lf
the
levels between
V"
fi
(315 Hz) and
V"
f,
(12.5 kHz) at
'-r
D1
and
il
D2
differ
by more
than
+
1
.5
dB cut
the bridges
81
(C 103),
82
(C
107) left channel,
or the
bridges 83
(C
1
04),
84
(C
1
0B) right channel.
V
(12.5 kHz)
V" (315
Hz)
Frequency
response
tolerance
range:
12.5 kHz
12.AF head
current
adjustment
during recording
Connect
the
AF-voltmeter
to
test
point,3
Dl
(left
channel)
or
test
point
,',-l
D2
(right channel)
on the audio
circuit
board.
lnsert test cassette 448 A, side
B
(blank part), Cr IEC
Il
or
similar
tape.
Connect
the
AF-generator
to the
LINE
lN sockets.
V,=
500
mV,
f
=
400
Hz.
Function:
Record-Start
Dolby off
Playback-Start
With
the level control (RECORD LEVEL)
set
the level
at
the
test
points
O DI
and
r.--,
D2
during
recording
to
120 mV.
On
playing back the
recording made
on the
cassette
recorder,
a
voltage level
of
120
mV
10.5
dB
must
be
present
at
the test
points ( ) D1
and
,:
D2.
lf
the
level differs from the value above re-adjust the head
currentcontrol
R 232
(leftchannel) orP
233
(rightchannel)
during
recording.
When recording on
Fe
IEC I cassettes
the
voltage must
be
120
mV
t1
dB.
l3.Frequency
adiustment
during recording
Connect
the AF-voltmeter
to
the test point
O
D1
(left
channel)
or
to
test
point
(-)
D2 (right channel) on the audio
circuit
board.
lnsert test
cassette
448 A,
side
B
(blank part) Cr IEC
ll
or
similar
tape.
Connect
the
AF-generator
to the
LINE
lN sockets.
(fl= 400
Hz,f
,=
12.5YL,
V,= 500
mV).
Function:
Record-Start
Dolby off
Playback-Start
With
the
levelcontrol(RECORD
LEVEL)
setthe
level
atthe
test points
,l
D.l and
..J
D2
during recording
to V"
=
20
mV.
When
playing back
the
recording
the
levels
at the
test
points
i
)
DI
and
t-) D2
must
not
differ by more than
0.5
dB.
lf
V"f,
to
Vof,
is higher
than 0.5
dB correct
the
bias.
Re-adjust
with
R
296
left channel,
or
R
295
right channel.
V
(12.5
kHz)
V" (400
Hz)
Frequency
response
tolerance
range:
12.5
k1z
14.Bias
voltage
Connect the
AF-voltmeter
via
1
:1000
capacitive
voltage
divider to
a;'
TP
5
(left
chan
nel, head connecto
r P10211)
or
to
O
TP 6
(right
channel,
head
connector
P102/6).
lnsert
a
recordable
cassette
with Fe and Cr
tape,
respectively.
Function:
Record-Start
The bias
voltage depends
on the type of tape
and
the
f
requency response setting.
Adjustment range:
Fe
=
13
-
1B
mV approx.
CrO-
= 21 - 26 mY approx.
l5.Distortion
factor
(200
mWm)
Connectthe
AF-voltmetertotest poinlO
D1
(leftchannel)
or
test point
a-)
D2
(right channel)
on
the
audio
circuit
board.
lnsert
a
recordable
cassette,
Fe
and
Crtape,
respectively.
Connect
the AF-generator
to the
LINE lN
sockets.
V;=
500
mV,
f
=
333
Hz.
Function:
Record-Start
Dolby off
Playback-Start
With
the level control (RECORD LEVEL)
set
the
level
at
the
test
points
.3
D1 and
,l
D2 during
recording
to V"
=
388
mV.
Distortion
factor measured
at
the
LINE OUT
sockets
at
47
kQ
on playing
back
the made
recording:
Fe lECl
K3<1.5%
CrO,
IEC
ll
Kz<2.0'k
G
R U
N
D
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G Servicetech
n
ik
2-5
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