Specifications
----
-
----
------
--
--_
. ..
ADJUSTMENTS
MASTER
CLOCK
ADJUSTMENT.
1.
Connect
a
frequency
counter
with
a
hi
gh
input
impedance
(lOOK
ohms
or
higher)
to
pin
15
of
U10
and
ground
.
2.
Adjust
C
17
(variable
capacitor)
so
the
frequency
counter
indicates
3.579545
MHz
± 100Hz.
RF
OUTPUT
ADJUSTMENT.
1.
Connect
a
frequency
counter
with
minimum
input
sensitivity
of
2mV
RMS
at 70MHz to
RF
Output
Jack
.
2. Set
Channel
Select
switch
to
channel
3.
3. Depress
and
hold
RESET
Button
and
adjust video
frequency
core
on
RF
Modulator
so
frequency
counter
reads
61
.250MHz ± 250kHz. Use
only
a
non-
ferrous
adjustment
tool.
•
SOUND
VIDEO
CAUTION
:
Use
care
not
to
damage
the
core.
4. Set
Channel
Select
switch
to
channel
4.
Verify
the
frequenc
y
counter
reads
67 .
65MHz
±
250kHz
.
SOUND
BUZZ
ADJUSTMENT.
1.
Adjust
volume
on
TV set
for
a
normal
level.
No
sync
buzz
or
hash
sound
should
be
heard
.
2. If a buzz is heard,
adjust
the
sound
coil
on
RF
modulator
for
minimum
buzz.
Use
only
a
non
-
ferrous
adjustment
tool.
CAUTION:
Use
care
not
to
damage
the
core.
3. If the
buzz
cannot
be
reduced
to
a satis-
factory
level,
replace
the
modulator
.
Top Vi
ew
UM1285-8
- -
I
I
I
RF
Modulator
-20-
•
•
•
r \
!
~
•