ICF-J1 - Sony Audio Service Manual (repair manual)

Model
ICF-J1
Pages
17
Size
839.82 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-j1.pdf
Date

View Sony ICF-J1 Service Manual online

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
 inches) dia., 8 
Output
v
 jack (ø 3.5 mm minijack)
Power output
350 mW (at 10 % harmonic distortion)
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
 in.) incl. projecting parts
and controls
Mass
Approx. 815 g (29 oz) incl. batteries
Supplied accessories
(Middle Eastern model only)
Case (1)
Hand strap (1)
Design and specifications are subject to change
without notice.
Battery life (approx. hours)
When using
FM
SW/MW
Sony alkaline
 240
250
LR20 (size D) batteries
Sony
 120
130
R20 (size D) batteries
Features
• High power sound
• Long battery life with two R20 (size D)
batteries
• High sensitivity
• Easy tuning with the tuning indicator
– 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.
CF3
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
HOW TO CHANGE THE 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 case
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, midway
– 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 
µ
V
[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 meter
set
TP9 (SP –)
TP8 (SP +)
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
+
level meter
TP9 (SP –)
TP8 (SP +)
TP1
 (ANT IN)
set
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
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 +)

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Here you can view online and download Sony ICF-J1 Service Manual in PDF. ICF-J1 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony ICF-J1 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.