ICF-S79W - Sony Audio Service Manual (repair manual). Page 2

UNLEADED  SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with 

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.
•  Unleaded solder melts at a temperature about 40 °C higher 

than ordinary solder.

 

Ordinary soldering irons can be used but the iron tip has to be 
applied to the solder joint for a slightly longer time.

 

Soldering irons using a temperature regulator should be set to 
about 350 °C.
Caution:  The printed pattern (copper foil) may peel away if the 

heated tip is applied for too long, so be careful!

• Strong 

viscosity

 

Unleaded solder is more viscous (sticky, less prone to fl ow) 
than ordinary solder so use caution not to let solder bridges 
occur such as on IC pins, etc.

•  Usable with ordinary solder
 

It is best to use only unleaded solder but unleaded solder may 
also be added to ordinary solder.

HOW  TO  CHANGED  THE  CERAMIC  FILTERS
This model is used two ceramic fi lters of CF1 and CF2.
You must used same type of color marked ceramic fi lters in order 
to meet same specifi cations.
Therefore, the ceramic fi lter must be changed two pieces together 
since it’s supply two pieces in one package as a spare parts.

Mark

Center frequency

red

10.70 MHz

blue

10.67 MHz

orange

10.73 MHz

black

10.64 MHz

white

10.76 MHz

This section is extracted 
from instruction manual.

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2

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TIMER

SET/ON/OFF

TIME ADJUST

TUNE/TIMER ADJUST

WEATHER

OFF

RADIO

ON

AUTO OFF

60 45 30 20 10

PRESET TUNING/PRESET TIMER

     SELECT/       PRESET

Setting the Clock

“AM 12:00” or “0:00” will flash in the display when the batteries are installed for the first time.
The clock can be adjusted whether or not the radio is on.

1

To stop flashing of the display, press 

CLOCK.

2

While holding down 

CLOCK, press TIME ADJUST + or – until the correct

time appears in the display.

When you release CLOCK, “:” starts to flash and the clock begins to operate.

• The clock system varies depending on the model you own.

12-hour system: “AM 12:00” = midnight, “PM 12:00” = noon.
24-hour system: “0:00” = midnight,  “12:00” = noon.

• To set the current time rapidly, keep pressing the + or

–button while holding down CLOCK.

• To set the current time from zero seconds, at step 2, release CLOCK with the time signal.