Sharp RG-6000H Serviceanleitung Seite 6
so
I
IC2
*VR401
LIO
IC7
VR 402
IC3
TC104
TC102
TC103
TCIO
Figure 9-1
ADJUSTMENT
POINTS
(RG-6000H)
THE INSTRUCTION
OF FREQUENCY
ADJUSTMENT
In order to comply with Pfg. Nr. 478/1981,
please fix the low
end of dial frequency (87.5MHz) and the high end of dial freq.
uency (108 MHz) on FM band, by adjusting oscillation
mer (TC502) Front End. And oscillation coil (L504) respec-
tively, as illustrated in Figure 9-3.
L504
so
I
IC2
IC3
LIO
VR2
TC104
TC102
TC103
0
TCIO
L2
7
Figure 9-2
ADJUSTMENT
POINTS
(RG-6000G/RG-9000)
HINWEISE
FÜR
DIE FREQUENZEINSTELLUNG
um die ZTF•Vorschrift
Nr. 478/1981 zu erfüllen, den unteren
Bereich der Skalenfrequenz auf (87.5 MHz) sowie den oberen
Bereich der Skalenfrequenz
auf (108 MHz) im UKW-Bereich
trim-
jeweils durch entsprechendes Einstellen des Schwingertrimmers
(TC502) der Eingangsstufe, und der Schwingerspule (L504)
gemäß Abbildung
9-3 festlegen.
o
TC502
O
o
Figure 9-3
GB
GENERAL
ADJUSTMENT
Should it become necessary at any time to check the align-
ment of this receiver, proceed as follows;
1. Connect an output meter across the speaker voice coil lugs.
2. Set the volume control
at maximum.
3. Attenuate the signals from the generator enough to swing
the most sensitive range of the output meter.
4. use a non-metallic alignment tool.
5. Repeat adjustments to insure good results.
AM IF/RF ADJUSTMENT
(MW/LW)
•
Set the band selector switch at MW or LW position.
• Set the signal generator to produce a signal of 400 Hz, 30%,
AM
modualted.
• Connected signal generator through a dummy to the
antenna socket (SOI). Connect generator ground lead to
the receiver chassis. (Refer to Figure 10—1)
FRE.
DIAL
TEST
REMARKS
STEP
QUEN-
POINTER
JUST.
STAGE
cy
SETTING
MENT
MW
IF
Adjustment
Adjust for maxi-
High
T2
mum
output
452kHz
Frequency
T3
speaker voice coil
lugs.
Repeat until no further
improvement
can be made.
2
MW RF Adjustment
Lowest
L7
510kHz
frequency
Band
3
Same as step I .
Coverage
Highest
1650k
Hz
TC103
frequency
TCIOI
Same as Step I.
4
Tracking
1400kHz
1400kHz
TC102
Repeat steps 3and 4 until no further
improvement
can be made.
5
LW RF Adjustment
1.8
Lowest
145kHz
(LW)
frequency
Band
Same as Step I .
6
Coverage
Highest
310kHz
TC104
frequency
7
Tracking
260k Hz
260k Hz
Same as step 1.
L4
Repeat steps 6 and .7 until no further improvement can be made.
8
TO ANTENNA
SOCKET
R = 80•Z (ohm)
z
65 PF
TO GROUND.
Z =
OUTPUT IMPEDANCE
OF SIGNAL GENERATOR
Figure 10—1 AM DUMMY
INSTRUCTIONS
FM IF/ADJUSTMENT
Set the band selector switch
at FM position.
Set the signal generator to produce a signal of 400Hz, 30%,
FM
modulated.
Connect signal generator through a .022MFD capacitor to
antenna socket (SOI).
Connect generator ground lead to
the receiver
chassis.
DIAL
TEST
STEP STAGE QUEN-
POINTER
JUST.
CY
SETTING
MENT
High
voltmeter
10.7MHz
IFTSOI
(NOTE B)
Frequency
test point
Same
See
2
Detector
10.7MHz
as step I.
NOTE
A.
3
Repeat step I until
no furhter
improvement
Connect signal generator
through a dummy
including
impedance of signal generator to the car antenna socket (SOI
Ground lead of generator
connected to the receiver chassis.
(Refer to Figure 10—2)
Band
Same
87.3MHz
TC502
4
on
Coverage
as step I.
NOTE
A
I. Connect electronic
voltmeter
between test point TPI and
chassis ground.
2. Adjust TI for maximum output on electronic voltmeter.
NOTE
B
Five kinds of ceramic filter
(CFI, 3) are available for this set.
The difference
of central frequency
from each other can be
known by the color indication. The table below shows such
a difference
of IF and S curve, depending upon the color
indications of the ceramic filter (CFI, 3)
10.64MHz
D
Black
B
Blue
10.67MHz
Central
Red
10.70MHz
A
Frequency
c
Orange
10.73MHz
E
White
10.76MHz
For their employment,
it is required to use two ceramic filters
of same type.
COLOR
MARK
ro
ANTENNA
SOCKET
RI
37.5 (ohm)
Z
75(0hm) <
R2 = 75 (Ohm)
RI = 50 (Ohm)
Z = 50(Ohm) <
R2 = 50 (Ohm)
TO GROUND
Z = OUTPUT IMPEDANCE OF SIGNAL GENERATOR
Figure 10—2 FM DUMMY
Figure 10—3
— 10 —
REMARKS
Connect
electronic
between
TPI and
chassis ground.
See NOTE
A.
can be made.
output
Adjust for maxi-
mum output at
speaker voice
coil.
30kHz
30kHz
30kHz
± 30kHz
± 30kHz
1
23
