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HPR4182: Replacing backup batteries in my Kenwood TS940S HF Radio Part 1
Note: all pictures are thumbnails which
can be clicked to show the full-sized image
Picture 1
Shows my beloved Kenwood TS-940S notice that the display on the top
right of the radio displays the words “TRIO-KENWOOD” this indicates that
the backup battery has failed. Under normal condition it would display
the time.
Wikipedia
article about an S0239 connector. This being the Antenna connector
which I had to remove before being able to work on the radio.
Link to the
YouTube video I used that described the process of removing the two
backup batteries in a Kenwood TS-940S. The video was very useful and
was very informative however as per usual it looked far easier than it
actually was or perhaps I’m just rubbish at taking radios to bits.
Picture 2
Shows a view of the radio with its top cover removed
The backup battery for the clock is tucked away underneath the front
top lip of the radio directly behind the display that showed
“TRIO-KENWOOD” This being above the front panel keypad.
The second backup battery is for the PLL (Phase-locked loop memories)
it is located underneath the speaker and switches to the right of the
speaker. Wikipedia article
about PLL (Phase-locked loop)
The Antenna tuning unit which I briefly mention is located at the
back right hand side of the unit. You can see the four holes on the top
of the panel presumable to allow for adjustments. To the left of the
four holes you can see the two motors that drive the tuning adjustments
when the auto tune (AT.T) button is depressed. Wikipedia article
about Antenna Tuners
Wikipedia article
about soldering that mentions dry joints
Link to TechMoan You-tube episode about a piece of audio equipment
that is destroyed by a leaking battery (Sony’s
self-destructing MD Recorder from 2070).
Picture 3
Shows a view of inside the radio with the bottom cover removed. The
radio is very analogue compared with modern radios. It contains many
adjustable ferrite cores which I would imagine would be a bit of
nightmare to setup. It also has a lot of electro mechanical relays.
These days it would all be done with solid state electronics and with a
small number of large scale integrated circuits. They truly don’t make
radios like this any more.
The connector which I removed from the timer board to allow the front
panel to rotate down can be seen in Picture 2. The timer board is a
small printed circuit board that sits on the top of the radio slightly
to the right and behind the clock display.
Picture 4
Shows the three internal side screws that need to be removed in order to
allow the front panel to be rotated down this being done to gain access
to the clock backup battery.
Picture 5
Shows a close up of the failed clock backup battery (silver disk with
orange rim), the cable harness with the black rigid plastic cable tie
which was already open. I can’t remember which connector was removed
either the one to the right of the battery or the one just out of sight
at the extreme bottom left hand side of the picture.
Picture 6
Shows the radio hanging over the desk with the front panel now rotated
down. I now have clear access to the clock backup battery which I’ll
cover in my next episode.
View all episodes
By Hacker Public Radio
4.2
3434 ratings
Note: all pictures are thumbnails which
can be clicked to show the full-sized image
Picture 1
Shows my beloved Kenwood TS-940S notice that the display on the top
right of the radio displays the words “TRIO-KENWOOD” this indicates that
the backup battery has failed. Under normal condition it would display
the time.
Wikipedia
article about an S0239 connector. This being the Antenna connector
which I had to remove before being able to work on the radio.
Link to the
YouTube video I used that described the process of removing the two
backup batteries in a Kenwood TS-940S. The video was very useful and
was very informative however as per usual it looked far easier than it
actually was or perhaps I’m just rubbish at taking radios to bits.
Picture 2
Shows a view of the radio with its top cover removed
The backup battery for the clock is tucked away underneath the front
top lip of the radio directly behind the display that showed
“TRIO-KENWOOD” This being above the front panel keypad.
The second backup battery is for the PLL (Phase-locked loop memories)
it is located underneath the speaker and switches to the right of the
speaker. Wikipedia article
about PLL (Phase-locked loop)
The Antenna tuning unit which I briefly mention is located at the
back right hand side of the unit. You can see the four holes on the top
of the panel presumable to allow for adjustments. To the left of the
four holes you can see the two motors that drive the tuning adjustments
when the auto tune (AT.T) button is depressed. Wikipedia article
about Antenna Tuners
Wikipedia article
about soldering that mentions dry joints
Link to TechMoan You-tube episode about a piece of audio equipment
that is destroyed by a leaking battery (Sony’s
self-destructing MD Recorder from 2070).
Picture 3
Shows a view of inside the radio with the bottom cover removed. The
radio is very analogue compared with modern radios. It contains many
adjustable ferrite cores which I would imagine would be a bit of
nightmare to setup. It also has a lot of electro mechanical relays.
These days it would all be done with solid state electronics and with a
small number of large scale integrated circuits. They truly don’t make
radios like this any more.
The connector which I removed from the timer board to allow the front
panel to rotate down can be seen in Picture 2. The timer board is a
small printed circuit board that sits on the top of the radio slightly
to the right and behind the clock display.
Picture 4
Shows the three internal side screws that need to be removed in order to
allow the front panel to be rotated down this being done to gain access
to the clock backup battery.
Picture 5
Shows a close up of the failed clock backup battery (silver disk with
orange rim), the cable harness with the black rigid plastic cable tie
which was already open. I can’t remember which connector was removed
either the one to the right of the battery or the one just out of sight
at the extreme bottom left hand side of the picture.
Picture 6
Shows the radio hanging over the desk with the front panel now rotated
down. I now have clear access to the clock backup battery which I’ll
cover in my next episode.
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