Read Sony ICF-B50 Service Manual online
– 1 –
SERVICE MANUAL
Tourist Model
MICROFILM
ICF-B50
SPECIFICATIONS
Frequency range
FM : 76 – 108 MHz
AM : 530 –1,605 kHz
AM : 530 –1,605 kHz
Speaker
Approx. 4.5 cm (1 3/4 inches) dia., 8 ohms
Power output
90 mW (at 10% harmonic distortion)
Output
@ jack (minijack)
Power requirements
3V DC, two R6 (size AA) batteries or CR-123A
lithium battery
lithium battery
Dimensions
Approx. 126 x 98.5 x 50 mm (w/h/d)
(5 x 4 x 2 in)
(5 x 4 x 2 in)
Mass
Approx. 220 g (7.8 oz)
Approx. 295 g (10.4 oz) incl. batteries and
projecting parts
Approx. 295 g (10.4 oz) incl. batteries and
projecting parts
Supplied accessories
Batteries (2)
Earphone (1)
Earphone case (1)
Shoulder strap (1)
Earphone (1)
Earphone case (1)
Shoulder strap (1)
Design and specifications are subject to change
without notice.
without notice.
FEATURES
A helpful emergency radio for emergencies and
disasters
disasters
•
Water-resistant against light rain and snow*.
•
Long-term preservative lithium battery
installed**.
installed**.
•
Useful at hand light attached.
*
This unit's water-resistance may be used in light
rain or snow, do not use the unit in heavy rain or
snow, or underwater. Avoid leaving the unit for a
long period of time in a humid place like the
bathroom which may lead the unit to a
malfunction.
rain or snow, do not use the unit in heavy rain or
snow, or underwater. Avoid leaving the unit for a
long period of time in a humid place like the
bathroom which may lead the unit to a
malfunction.
** Preservation is better compared to the regular dry
batteries, Long-term preservation is possible
when not in use.
when not in use.
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.
aged by heat.
FM/AM RADIO
– 2 –
SECTION 1
GENERAL
1-1. IDENTIFYING THE PARTS
HOW TO CHANGE THE CERAMIC FILTERS
This model is used two ceramic filters of CF1 and 3.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must change two pieces together since
it's supply two pieces in one package as a spare parts.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must change two pieces together since
it's supply two pieces in one package as a spare parts.
red
–
10.70 MHz
blue
–
10.67 MHz
orange
–
10.73 MHz
black
–
10.64 MHz
white
–
10.76 MHz
white
white
10.75 MHz
yellow
–
10.79 MHz
mark 1
mark 1 mark 2 mark 1 mark 2
Center
Frequency
mark 2
CF1
CF3
– 3 –
SECTION 2
SERVICE NOTE
• Drip prevention
When the cabinet, telescopic antenna and knobs are removed in
repairing, be sure to perform the following :
repairing, be sure to perform the following :
Apply Sony grease SGL-505 (7-662-010-04) to all along the ribs
of the cabinet (rear) with an applicator. Apply sealant TSE392-W
(7-432-950-03) to all along the ribs of the cabinet (front) assy
and to all the perimeter of the speaker.
of the cabinet (rear) with an applicator. Apply sealant TSE392-W
(7-432-950-03) to all along the ribs of the cabinet (front) assy
and to all the perimeter of the speaker.
SONY grease SGL-505
(7-662-010-04)
(7-662-010-04)
cabinet (rear)
sealant TSE392-W
(7-432-950-03)
(7-432-950-03)
cabinet (front) assy
sealant TSE392-W
(7-432-950-03)
(7-432-950-03)
Apply Sony grease SGL-505 (7-662-010-04) to the specified
portions of the knobs and packing as given below.
portions of the knobs and packing as given below.
Grease applied portion
(cabinet)
(cabinet)
ring spring
O ring (VOL)
(Apply grease to the
inside and outside
of O ring.)
(Apply grease to the
inside and outside
of O ring.)
Grease applied portion
(cabinet)
(cabinet)
O ring (TUNE)
(Apply grease to the inside
and outside of O ring.)
(Apply grease to the inside
and outside of O ring.)
knob (TUNE)
knob (VOL)
ring spring
– 4 –
Pointer Setting
Note :
Follow the assembly procedure in the numerical order given.
claws
3
Install the guide (rail).
4
screw
2
Install the pointer to the
location given in the figure.
1
Rotate the tuning shaft in the
direction of the arrow fully.
