Sony ICF-C253 Service Manual ▷ View online
ICF-C253
Australian Model
SERVICE MANUAL
FM/AM PLL SYNTHESIZED CLOCK RADIO
SPECIFICATIONS
Ver 1.1 2002. 03
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-927-909-12
2002C1600-1
© 2002.03
— 2 —
SECTION 1
GENERAL
This section is extracted
from instruction manual.
from instruction manual.
1.
Check the area of your repair for unsoldered or poorly-soldered
connections. Check the entire board surface for solder splashes
and bridges.
connections. Check the entire board surface for solder splashes
and bridges.
2.
Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.
"pinched" or contact high-wattage resistors.
3.
Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair. Point
them out to the customer and recommend their replacement.
transistors, that were installed during a previous repair. Point
them out to the customer and recommend their replacement.
4.
Look for parts which, through functioning, show obvious signs
of deterioration. Point them out to the customer and
recommend their replacement.
of deterioration. Point them out to the customer and
recommend their replacement.
5.
Check the B+ voltage to see it is at the values specified.
6.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.
safety checks before releasing the set to the customer.
— 3 —
SECTION 2
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
•
The equipment can be removed using the following procedure.
Key board
Cabinet (upper)
Set
Main board
Power board
2-1.
CABINET (UPPER)
2
Cabinet (upper)
4
Speaker
3
Remove the two solderings.
1
1
Five screws (M3
×
14)
— 4 —
2-2.
KEY BOARD
1
Two claws
5
Two claws
2
Two claws
6
Chassis
4
Key board
3
Remove the eight solderings.
7
Cabinet (lower)
2-3.
MAIN BOARD
8
Main board
6
LED board
3
Alarm dial board
4
Claw
7
Remove the four solderings.
5
Remove the four solderings.
1
Remove the
five solderings.
2
Two screws (BTP 2
×
8)
