Mechanical Adjustment - Sharp GF-4949ZS Service Manual

Except for the following item, refer to the RD620X Service
Manual already issued.
n RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
As shown in Figure 5-1, connect instruments, and adjust
the head azimuth adjusting screw so that the output signals
from both channels will have maximum waveform with the
same phase in right and left.
Should it become necessary at any time to check the alignment of this receiver, proceed as follows;
2. Attenuate the signals from the generator enough to swing
the most sensitive range of the output meter.
A M I F / R F A L I G N M E N T
Set the signal generator to produce a signal of 400Hz, 30%,
l
AM modulated.
TEST
IF (Connect instruments as shown in Figure 5-2.)
RF (Connect instrumentsas shown in Figure 5-3.)
4 A M 600
5 A M ing 1400
Repeat steps 2.3.4 and 5 until no further Improvement
6
can be made.
RF (Connect instruments as shown in Figure 5-4.)
2.25
Band
MHz
7.4
MHz
6.0
0
MHz
can be made.
7.2
12 SW,
MHz
22.5
13
MHz
a.5
14 SW,
MHz
ing
19
15 SW,
MHz
Repeat steps 12, 13, 14 and 15 until no further impro-
16
vement can be made.

MECHANICAL ADJUSTMENT

GENERAL ALIGNMENT INSTRUCTION
output.
600
1400
TC5
LOW
end of
dial
High
end of
TC7 Adjust for
dial
maximum
6.0
MHZ
Low
end of La
dial
High
Adjust for
end of
maximum
dial
output.
a.5
MHz
19
TC3
MHz
Figure 5-l
3. Use a non-metallic alignment tool.
4. Repeat adjustments to insure good results.
5. Set the Function Selector Switch (SW102) to "radio"
position.
Figure 5-2
Figure 5-3
Figure 5-4
bringing a piece of ferrite (such as a coil slug) near the antenna
loop stick, then a piece of brass. If ferrite increases output,
loop requires more inductance. If brass increases output, loop
requires less inductance. Change loop inductance by sliding the
bobbin toward the center of the ferrite core to increase induct-
ance, or away to decrease inductance.