From    : G1YYH @ G1YYH.GB7CRG.NW.GBR.EU
To      : MODS @ GBR
Date    : 891214/2038
Msgid   : BF 205@G1YYH, 14570@GB7YHF $THX5AT.PT2
Subject : Kenwood TH-x5at Mods - 2/4
Path    : GB7YAX!GB7CHS!GB7CRG!G1YYH


(1)Only 8 screws must be removed from the case to take the radio
apart; these are the 4 screws that hold the battery clip on, the 2
screws on the back half of the case near the PTT switch, the screw on
the back of the case under (and in line with) the BNC connector, and
the screw on the back half of the case adjacent to the external
speaker jack.

(2)After removing these 8 screws, remove the front half of the
case from the back half.  You may unconnect the blue plug from the
touch tone circuitry on the front half of the case to make further
work on the radio more convenient, but it is not necessary.

(3)Place the radio back side down with the antenna away from
you.  Now, unsolder the two grounding wires from the plate which
covers much of the radio's circuitry.  These wires are near the top
of the plate and will be quite obvious.

(4)Next, remove the 7 screws that hold this plate on.  5 of the
screws for this plate are up on top and are quite obvious; the other
2 are at the bottom of the plate, and may be hidden by your CTCSS
unit.  Remove the plate.

(5)Remove the red plug with about 7 wires that connects just
under the volume and squelch switch.

(6)Remove the screw that holds the PTT/LAMP/MONI switch
assembly; this screw is on the left side of the radio just under the
PTT switch.

(7)Remove the two screws that hold the top assembly to the back
case of the radio; these two screws are on either side of the orange
flexible circuit board coming from the top assembly and plugging into
the back case of the radio.  You may need to use a screwdriver or
stick to move the orange flexible circuit board out of the way in
order to see these final two screws.

(8)Unplug the orange flexible circuit board from the back case.
At this point, the whole top assembly should come free quite easily.
The BNC connector will stay attached to the back case, and the whole
top assembly will come up over it.

(9)Unfold the flexible circuit board and unfold it so that the
components are accesable.  One of the fold-out parts of the flexible
board will look something like this: (the component side is shown up)

+----------------+
| R R R R D3 R R |
| 2 2 2 2    7 2 |The O's are very large solder pads.
| 5 4 3 2      1 |
|                |
| R  O      O R20|Not all components will be installed on your
| 2  O      O R19|circuit board.
| 6  O      O R18|
|    O      O R28|
|                |D3 & D4 are two diodes in a three terminal
|              R |package.  The anodes of the diodes are in
|           D4 6 |common.
|        +-------+
|        |
|        |

The fold out board is actually square, but with only characters for
graphics, I couldn't draw it that way.  It comes out reasonably
square on a printer with 10 characters/inch and 6 lines/inch.

On both radios, R27 is located to the right of the four blue buttons
on the back of the radio (M CTCSS SHIFT REV).  You should be able to
see this on the back of the now removed top assembly.

On both radios, R36 is for the European tone burst to "whistle up"
repeaters.  R36 is located on another portion of the flexible circuit
board, closest to pin 1 of IC2.  IC2 is the IC closest to the
portion of the flexible circuit board shown above.  Most users will
not want to change R36.

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