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Sharp QT-15XW Service Manual page 5

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QT-15XW
GND
GND
@ For adjustment in step 1, see | Note Bi.
TP2
TP5
TesT | FRE-
[DIAL | AD-
STEP| BAND | STA-
|QUEN- | SET-
|JUST-
Figure 5—1 FM IF
GE | cY
|TING
|MENT
IF (Connect instruments as shown in Figure 5—1.)
DUMMY
(J101)
Figure 5—2 FM
RF
Adjust for
maximum
output.
R1
To Telescopic Rod Antenna
2= 75 ohm << Rt" 37.5 ohm
88
88
L2
Track-
| MHz
MHz
ES
7
!
R2 = 75 ohm
108
108
:
R1 = 50 ohm
'&)
ene
<= R2 = 50 ohm
To Chassis GND
Repeat steps 2, 3, 4 and 5 until no further improvement
Z: Output impedance of signa! generator
can be made.
Figure 5-3 FM
DUMMY
When
ceramic
filters
other
than
the one
(red) having the
central frequency of 10.7 MHz
are used, note that a marker
(10.7 MHz) of FM sweep generator, if used, will be deviated —
therefore,
adjust the generator
by putting off the marker.
Color Mark
| Blue —|_: 10.67 MHz + 30 kHz
| Red | 10.70MHz+30kHz
1. Input
2. GND
3. Output
Central
frequency (fo)
Figure 5—4
NOTES
ON
SCHEMATIC
DIAGRAM
1. Resistor:
e The voltages in each part are measured with no signal given,
Unless
otherwise
specified,
resistors
are shown
in ohm,
by using a digital
multimeter with the unit in play mode.
K (1000 ohm), and 1/4W type.
The following must also be observed:
2. Capacitor:
Radio circuit:
Voltages
without
parentheses
are for FM
e
Unless
otherwise
specified,
capacitors
are
shown
in
mode,
and
those
with
parentheses
for
microfarads, P = Picofarads
AM mode
e (CH), (RH) : Temperature compensation
e Specifications or wiring diagram of this model are subject
to change for improvement without prior notice.

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