FM IF/RF
ALIGNEMNT
l
Set the signal generator to produce a signal of 4OOHz.
30%.
FM modulated.
iTP1
I
10
7
MH%.
Teletcoplc
ITPZ)
Figure
6-l
c
TEST FRE-
DIAL
AD-
STEP BAND
STA-
QUEN-
SET- JUST-
REMARKS
GE CY
TING
MENT
IF (Connect instruments as shown in Figure 6-l
.)’
I I
1
(
FM
/
I
10.7
High
T,
Adjust for
F
MHZ
end of
T2
best “S”
dial
curve.
I
I
RF (Connect instruments as shown in Figure
6-2.)
ITPll
ELECTRONIC
FM
SIGNAL
VOLTMETER
GENERATOR
lTP21
87.1
Low
2
FM
Band
MHz
end of
L3
dial
cover-
age
3
FM
109.0
High
MHz
end of TC2
dial
4
FM
88
a8
Track-
MHz
MHz L2
7
5
r.*
Adjust for
maximum
output.
Figure 6-2
io”
FM
STEREO
(5Pll
Tekc0pl.Z
IC3
SlGNAL
GENERATOR
FREOVENCY
@pin
?mJoPF
COUNTER
IllIll
_
330K
ohm
GNO
(See
Figure
6-4
iTP2)
1
I
I
I
I
I
c IRepeat steps
2,3,4
and 5 until no further improvement
”
can be made.
I
CUrYe
1
Figure 6-3
”
VCO FREQUENCY
ALIGNEMNT
l
Set the Band Selector Switch
(SWI)
to “FM” position and
Function Switch
(SW102)
to “stereo” position.
l
Before this adjustment, connect the anode side of Stereo
Indicator
(D103)
to GND.
l
As shown in Figures 6-3 and
6-4,
connect instruments.
FREQUENCY
DIAL AD JUST
POINTER MENT
REMARKS
98MHz
(54dB)
98MHz
VRl
Adjust for
unmodulated
38
f
O.lSkHz.
To
Telescopic
Rod
Antenna
2
=
,5
ohm
(
Rl
=
37.5
ohm
R2
=
75 OhIn
iTER
Figure
6-4.
FM DUMMY
Figure 6-5 ALIGNMENT POINTS
NOTES ON SCHEMATIC DIAGRAM
1,
Voltage readings are measured with Digital
Multimeter
under
no signal condition at tape position.
(
)
:
AM mode
:
FM mode
2. Unless otherwise specified, all resistance is shown in ohms.
K
=
1000 ohms
3, Unless otherwise specified, all capacitance is shown in
microfarads.
P
=
Picofarads
(CH), (RH)
:
Temperature compensation
4.
-ub-
:
Printed resistor
5.
B
and
F
in Band Selector Switch
(SWI),
at each mode, are
shown in Table 6. And the Terminals except for the mode
in use are connected to the ground.
MODE
1
POSITION
/
by
na
-c
oP
he
ct-
FM
SW,
Table 6
-6-
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