Sharp SYSTEM-W7H Serviceanleitung Seite 12

SYSTEM-W7H
%/LW IF/RF ADJUSTMENT
SIGNAL 400 Hz, 3m6, AM modulated
GENERATOR
TEST FRE-
STEP STAGE QUENCY
MW IF
1 IF 455 kHz
MW RF
2 513 kHz
Band
coverage
3
1 ,650 kHz
4 Repeat steps 2 and 3 until no further
be made.
5 600 kHz
Tracking
6 1,400
7
Repeat steps 5 and 6 until no further
be made.
LW RF
8
144 kHz
Band
coverage
9
295 kHz
Repeat steps 8 and 9 until no further
10
be made.
11
160 kHz
Tracking
12
260 kHz
13 Repeat Steps 1 1 and 12 until no further
can be made.
CIRCUIT ADJUSTMENT
DIAL
POINTER
JUST- REMARKS
SETTING
MENT
High
T2 Adjust for
frequency
best
curve.
LIO
Lowest
frequency Adjust
maximal
Highest TC6
output.
frequency
improvement
600 kHz L8
Adjust for
maximal
kHz 1,400 kH
TC4
output.
improvement
Lowest LII
frequency Adjust
maximal
Highest TC7
output.
frequency
improvement
160 kHz L9 Adjust for
maximal
260 kHz TC5
output.
improvement
Figure 16—4 ADJUSTMENT POINTS
(TUNER SECTION)
AM Sæep Generator
O
for
AM Signal Generator
can
o
can
for
can
TUNER P.W.B.
rc3 TC2 TCI
Orc 7
øLII
Tcs
TC4
0.04
Unit
Ground
Figure 16—1 AM IF
IF curve
Figure 16—2
Loop Antenna
AM Bar Antenna
Unit
Figure 16—3 MW/LW RF
o
00
TC4
Oscilloscope
TP3
Ground
Electronic
Voltmeter
Speaker
Output
O
Ground