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12-1.
PB
RF
FREQUENCY
RESPONSE
ADJUSTMENT
(1)
To
make
this
adjustment,
the
head
drum
rotation
is stopped
without
a cassette
tape,
and
the
sweep
signal
is
L-coupled
to
the
video
head
using
an
inductor
(approximately
100,H).
SWEEP
GEN
LY
=
LG
~
L=1m
-|
75Q
100 wH
Sweep
signal
band
width:
1
to
1OMHz
Bring
an
inductor
near
the
video
head.
Step 1. CH-A
RF
frequency
response
adjustment
machine
conditions
for
adjustment
spec.
adjustment
Short
between
CN104-10B/
DM-54
(D-7)
and
GND;
and
TP12/MD-44
(E-8)
and
GND
with
shorting
clips.
¢ Adjust
the
sweep
signal
gener-
ator
output
so
that
the
signal
level
in
250mVp-p.
*Couple
a
sweep
signal
to
the
video
head
(CH-A).
¢ Adjust
the
coupling
so
that
the
amplitude
is maximized.
«After
the
adjustment
ts
com-
pleted,
remove
the
shorting
clips.
TP7/RP-30
(D-2)
1MHz
7MHz
1MHz
7MHz
100%
l
0
(reference)
00%
TRIG:
Trigger
output/sweep
generator
@ RV4/RP-30
(D-2)
12-2
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