Sony ICF-111B - 3-2. AM IF ALIGNMENT; 3-3. FREQUENCY COVERAGE AND TRACKING ADJUSTMENT; 3-4. CURRENT ADJUSTMENT

3.
Turn
the
core
of
discriminator
transformer
(IFT
F5)
to
obtain
the
S
curve
response
shown
in
Fig.
3-4.
3-2. AM IF ALIGNMENT
Test Equipment/Tools Required:
Rf signal generator (for a-m)
VTVM
Loop antenna
8Q resistor
Slot screwdriver
* * + & &
Rf Signal
Generator
Coupling
Rf Signal
Generator
Frequency
VTVM
Connection
455 kHz
1 kHz
(30% a-m)
Earphone jack with
8 load resistor in
parallel.
Loop antenna
(See Fig. 3-5.)
3-3. FREQUENCY COVERAGE AND
TRACKING ADJUSTMENT
Test Equipment/Tools Required:
Rf signal generator (for fm and a-m)
Loop antenna
VTVM
8Q. resistor
Slot screwdriver
* %*+ %*+ + *
Preparation:
VTVM
Connection:
To
earphone
jack
with
82
resistor
in
parallel.
FM...400
Hz
22.5
kHz
fre-
quency-modulated
signal
AM...1kHz 30% ampli-
Modulation:
tude-modulated signal
Rf Signal Rf Signal
Generator Generator
Coupling Frequency
FM
Frequency
Coverage
Direct
connection
Receiver
Tuning Knob
86.5MHz | Polly |
counterclockwise
Fully FM osc trimmer
to
telescopic
Tune
in
Corso
fm
Adjust
for
maximum
antenna
cae:
open
88
MHz
signal
rf
coil
LO3
ade
FM
See
Fig.
3-6.
|
|
Tracking
Tune ie: FM rf trimmer
106MHz | 106 MHz signal CTO1
ICF-111B
rf signal loop antenna
generator
earphone
é
>
icF-111B
|
13°
O
LO
ere = a =
8Q. resistor
Fig.
3-5.
A-m
i-f
alignment,
frequency
coverage
and
tracking
adjustment
setup
MW
Scale 10 (maximum
volume)
HIGH
fully clockwise
position
Band selector:
VOL control:
Cores of
IFT Al
CFT Al
TONE control:
Tuning knob:
Adjust for maximum meter reading.
Maximum
VOL Control Setting:
TONE Control Setting: HIGH
AFC Switch: OFF
rf
signal
generator
VIVM
BQ oes |
a ICF-1 1 1B en ees | \
| i phone | | \ |
[ ~~ \ | | jack
O oe
,
. telescopic antenna lead
Fig. 3-6. _Fm/sw frequency coverage and tracking
adjustment setup
Core of fm
osc coil LO4
Band Selector: FM
ICF-111B
Rf Signal Rf Signal Receiver
Adjustment
Generator
Generator
Tuning
Knob
Coupling Frequency Setting
MW
Frequency
Coverage
Fully .
clockwise
1,680 kHz
Loop antenna
| Fully
counterclock wise
Core of mw
osc coil L10
MW osc trimmer
CT04-2
Band Selector: MW
Adjust for maximum
ue
See
Fig.
3-5.
Tune
in
Position
of
mw
meter
reading.
si
:
620kH2
|
620kHz
signal
|
ant
coil
L06
rackang
1.400
kHz
Tune
in
MW
ant
trimmer
?
1,400kHz
signal
CT03-2
Fully
Core
of
sw
Frequency
Coverage
:
Full
SW
osc
trimmer
a
Direct
12.6
MHz
al
ie:
CT04-1
Band
Selector:
SW
connection
Bosra
a
to
telescopic
7
C
f
Adjust
for
maximum
une
im
-Ore
Ol
SW
meter
reading.
antenna
lead.
|
4MHz
4
MHz
signal
ant
coil
LOS
-
SW
See
Fig.
3-6.
Tracking
10
MHz
Tune
in
SW
ant
trimmer
10MHz
signal
-
CT03-1
LO6
LOg
MW
ant
SW
osc
2.
ROI
ou,
IFT
F2
ROO
is
selected
in
value
in
accordance
with
CT03-1
ant
ge
rete
ieee
Se
pinch-off
voltage
of
FET
Q02.
CT03-2
rank
of
pinch-
MW
ant
off
voltage
L10
i
os
LO3
102
CTO!
FM
rf
rank
of
pinch-
CTO2
off
voltage
FM
osc
(7
or
2)
ie
Q02
IFT
Al
IFT
F4@
2SK23
Fig.
3-7.
Adjusting
parts
location
3.
R58
R58
is
selected
in
value
in
accordance
with
3-4.
CURRENT
ADJUSTMENT
hfe
rank
of
transistor
Q1O0
and
Q11,
and
gain
1.
RO2
rank
of
ICl.
“ RO2 is selected in value in accordance with
hfe rank of fm rf amplifier transistor QOl1.
hfe rank
(2, 3 or 4)
Q01
2SC710
hfe rank
(3
or
4)
8
7
6
|
Bie
gain
rank
(7 or 2)
collector |
mark
.
— a5 D Al Oor?l
dot
Q10,
11
a
pee
2SB
495
7
2
3
1C1
CX-025