Sony ICF-J1 User manual

SERVICE MANUAL
Ver 1.0 2000. 12
FM/SW/MW 3 BAND RADIO
E Model
ICF-J1
SPECIFICATIONS
Frequency range:
FM: 87.5 – 108 MHz
SW: 4.75 – 18.0 MHz
MW: 530 – 1 605 kHz
Speaker
Approx. 9.2 cm (3 5/8 i ches) dia., 8 Ω
Output
v jack (ø 3.5 mm mi ijack)
Power output
350 mW (at 10 % harmo ic distortio )
Power requirements
3 V DC, two R20 (size D) batteries
Dimensions
Approx. 233 × 119.2 × 56 mm (w/h/d)
(9 1/4 × 4 3/4 × 2 1/4 i .) i cl. projecti g parts
a d co trols
Mass
Approx. 815 g (29 oz) i cl. batteries
Supplied accessories
(Middle Eastern model only)
Case (1)
Ha d strap (1)
Desig a d specificatio s are subject to cha ge
without otice.
Battery life (approx. hours)
When using FM SW/MW
So y alkali e 240 250
LR20 (size D) batteries
So y 120 130
R20 (size D) batteries
Features
• High power sou d
• Lo g battery life with two R20 (size D)
batteries
• High se sitivity
• Easy tu i g with the tu i g i dicator

– 2 –
TABLE OF CONTENTS
1. GENERAL ................................................................... 2
2. DISASSEMBLY ......................................................... 3
3. ASSEMBLY................................................................. 7
4. ELECTRICAL ADJUSTMENTS......................... 9
5. DIAGRAMS
5-1. Block Diagram ................................................................ 11
5-2. Printed Wiring Board ...................................................... 13
5-3. Schematic Diagram ......................................................... 15
6. EXPLODED VIEWS................................................ 17
7. ELECTRICAL PARTS LIST ............................... 19
SECTION 1
GENERAL
This section is extracted from
instruction manual.
Insert the #side of the battery first.
Inserte en primer lugar la parte #de la pila.
R 20 (size D) ×2
pila R20 (tamaño D) ×2
Pass the strap through the buckle.
Pase la correa a través de la hebilla.
Telescopic antenna
Antena telescópica
indicator
indicador
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
CF
3
CF1
mark
Mark Center frequency
red 10.70 MHz
blue 10.67 MHz
orange 10.73 MHz
black 10.64 MHz
white 10.76 MHz
HOWTO CHANGETHE CERAMIC FILTERS
This model is used two ceramic filters of CF1 and CF3.
You must used same type of color marked ceramic filters in order
to meet same specifications.
Therefore, the ceramic filter must changed two pieces together
since it's supply two pieces in one package as a spare parts.

– 3 –
SECTION 2
DISASSEMBLY
• This set can be disassemble in the order shown below.
Note: Follow the disassembly procedure in the numerical order given.
LID, BATTERY CASE
Set Lid, Battery Case
“Knob (Tuning)”, “Knob (Volume)”
Chassis Section Main Board Chassis
Antenna, Ferrite-Red (MW) (L1)
Speaker (9.2 cm) (SP1)
“Antenna, Telescopic (FM/SW) (ANT1)”, “Cabinet (Rear)”
1 Open the battery case lid.
2 boss
2 boss
3 lid, battery cas
e
2 tuning, spring
knob (volume)
hole
variable resistor (RV1)
Note: Insert the knob (volume) into
the variable resistor (RV1),
meeting both shapes of the hole
in the knob and the shaft of RV1 as shown.
3 knob (tuning
)
1
4
6 knob (volume)
5 O ring, P-9
“KNOB (TUNING)”, “KNOB (VOLUME)”

– 4 –
“ANTENNA, TELESCOPIC (FM/SW) (ANT1)”, “CABINET (REAR)”
CHASSIS SECTION
antenna, wire
Note: Arrange the antenna,
wire to the 4 slots.
2 claw
5 lug, 3
2 claw
3
4
screw
(P2.6
× 8)
1 five screws
(BTP3
× 12)
7 cabinet (rear)
6 antenna, telescopic
(FM/SW) (ANT1)
2 terminal (+),
battery
3 terminal (–),
battery
4 chassis section
1 Remove two solders
of speaker lead wires.
MAIN Board
speaker lead wire (RED)
battery terminal (–)
lead wire (WHT)
SP
3
SP #
GND
+ B
battery terminal (+)
lead wire (WHT/RED)
speaker lead wire
(WHT)
• LEAD WIRE COLOR INDICATION
ON MAIN BOARD.
terminal (–),
battery terminal (+),
battery
Note: When mounting the battery terminals (+) and (–), engage the lead wires
to the hook on the cabinet (front) and route them as shown.
hook
cabinet (front)

– 5 –
Note: For the mounting position
of the antenna, ferrite-rod (MW) (L1),
refer to the “ANTENNA,
FERRITE-ROD (MW) (L1)”
in DISASSEMBLY.
7 claw
slider
7 claw
8 MAIN board
Note: On installation MAIN board
adjust the S1, S2 and
slider, knob (POWER).
5 gear (tuning capacitor)
Including “spring (gear)”,
“gear (B), tuning capacitor”.
Note: When the gear (tuning
capacity), spring (gear),
and the turning capacitor
gear(B) were removed
and then, they are mounted
on the main board,
refer to the “GEAR
(TUNING CAPACITOR)”,
“SPRING (GEAR)”, “GEAR
(B), TUNING CAPACITOR”in
ASSEMBLY on page 8.
6 Remove LED LN21RPL (TUNE)
(D2) by raising in the arrow direction,
not giving an excessive force.
knob
(POWER)
S2
S1
2 screw
(BTP3
× 12)
2 screw
(BTP3
× 12)
1 Remove three solders
of ferrite-rod (MW)
antenna (L1) leads.
4 screw
(B2.6
× 5)
3 holder (gear)
()
MAIN BOARD
ANTENNA, FERRITE-ROD (MW) (L1)
2 Remove five portions bond
SC-12N.
Note: When mounting the antenna,
ferrite-rod (MW) (L1), route the lead wires
as shown and apply the bond SC-12N
to the removed portion.
4 antenna, ferrite-rod
(MW) (L1)
3 four claws
1 Remove three solders of
ferrite-rod (MW) antenna (L1)
lead wires.
• FERRITE-ROD ANTENNA LEAD WIRE
COLOR INDICATION ON MAIN BOARD.
black lead wire
natural lead wire
red lead wire
MAIN board
BLK
NATURAL
RED

– 6 –
SPEAKER (9.2 cm) (SP1)
2 claw
3 Remove speaker (SP1) in the
direction of arrow
A .
speaker lead wire (RED)
speaker lead wire
(WHT)
cabinet (front) claw
speaker (9.2 cm)
(SP1)
A
3
#
1 Remove shaded portion bond SC-108.
Note: When installing the speaker (SP1),
set it in the position as shown, and apply
the bond SC-108 to the removed portion.
CHASSIS
9 two claws
0 pointer
qa plate, back
qs rack
qd chassis
3 slider
Note: When assembling the chassis,
refer to the “DIAL POINTER SETTING”
in ASSEMBLY.
2 two claws
2 two claws
7 two claws
8 shaft, tuning
5 knob (power)
4
4
1
knob (band)
6 gear, midwa
y

– 7 –
SECTION 3
ASSEMBLY
Note: Follow the assembly procedure in the numerical order given.
DIAL POINTER SETTING
•RACK
• MAIN BOARD
4 pointer
3 Mount the back plate,
meeting with two bosses of
the chassis.
1 rack
6 gear, midway
5 shaft, tuning
boss chassis
boss
2 Meet the portion of
the rack with the mark
of the chassis.
chassis
mark
a
a
b
b
rack
2 claw
3 LED LN21RPL (TUNE) (D2)
4 screw
(BTP3
× 12
)
1 MAIN board
2 claw

– 8 –
• “GEAR (TUNING CAPACITOR)”, “SPRING (GEAR)” AND “GEAR (B), TUNING CAPACITOR”
“GEAR (TUNING CAPACITOR)”, “SPRING (GEAR)” AND “GEAR (B), TUNING CAPACITOR” SETTING
gear, midway
1 Turn variable condenser (CV1)
shaft fully to the arrow direction
(ant1-clok wise). Note: Make sure that two tuning capacitor gears
are meshing with the midway gear.
gear, midway
triangle mark
triangle mark
3 screw (B2.6 × 5)
Note: Secure screw.
5 screw (BTP3 × 12)
4 holder (gear)
2 gear (tuning capacitor)
Including “spring (gear)”,
“gear (B), tuning capacitor”.
Note: Adjust so that the triangle
marked is at the position
shown and install.
()
gear (tuning capacitor)
1 Insert the spring (gear)
into a hole in the gear
(tuning capacitor).
2 Fit the tuning capacitor gear (B)
to the gear (tuning capacitor),
and then turn the tuning capacitor gear (B)
in the A direction.
A
3 Engage the spring (gear)
to the hook of the tuning
capacitor gear (B) as shown.
hook
spring (gear)

– 9 –
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1 455 kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L5 516.5 kHz
CT1-4 1,631.5 kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1 600 kHz
CT1-1 1,400 kHz
SW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L6 4.7 MHz
CT6 18.5 MHz
SW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2 4.75 MHz
CT5 18 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4 87.35 MHz
CT1-3 108.25 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3 87.5 MHz
CT1-2 108 MHz
Adjustment Location: MAIN board (See page 10)
SECTION 4
ELECTRICAL ADJUSTMENTS
0 dB=1 µV
[MW]
Setting:
Band switch: MW
[SW]
Setting:
Band switch: SW
[FM]
Setting:
Band switch: FM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
• Remove FM/SW antenna in SW and FM adjustments.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
+
–
level mete
r
set
8 Ω
TP9 (SP –)
TP8 (SP +)
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
+
–
level mete
r
TP9 (SP –)
TP8 (SP +)
TP1
(ANT IN)
set
8 Ω
12 pF
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
TP9 (SP –)
TP8 (SP +)
TP1
(ANT IN)
set
8 Ω
0.01 µ F

– 10 –
Adjustment Location:
L1 CT1-1
MW Tracking
Adjustment L3 CT1-2
FM Tracking Adjustment
T1
AM IF Adjustment
SW Tracking
Adjustment
L2 CT5
– MAIN BOARD (Component Side) –
MW Frequency
Coverage
Adjustment
CT1-4 L5
SW Frequency Coverage
Adjustment
CT6 L6
CT1-3 L4
FM Frequency Coverage
Adjustment
–MAIN BOARD (Conductor Side) –
TP1 (ANT IN)
TP2 (GND)
TP9 (SP –)
TP8 (SP +)