Tait TM8000 Series, Service Manual

Page: 149 / 244

TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio 149
May 2004 © Tait Electronics Limited
Re-install Control-head
Board
Re-install the control-head board and, if included, the optional
microphone board as follows. The torque values for the screws securing
the control-head board are included in
Table 6.3 .
1. Place the control-head board in position on the space-frame.
Ensure that the board fits inside the four guides on the frame. The
guides are labelled guide 1 to guide 4 in
Figure 6.3 .
2. Press straight down on the control-head board until the three clips
on the space-frame snap into position against the board. The clips
are labelled clip 1 to clip 3 in
Figure 6.3 . It is important not to
press down on the circuit board at an angle. To do so might distort
the elastomeric strips, causing failure in the operation of the LCD.
3. Screw in by hand the three screws that secure the control-head
board. The screws are labelled screw 1 to screw 3 in
Figure 6.3 .
Ensure that the screws start easily and are not cross-threaded.
Then, beginning with screw 1, use a Torx T10 torque-driver to
tighten the screws to 0.6 N
·
m (5 lbf
·
in).
4. If an optional microphone board is included, attach the board to
the control-head board. Two sockets on the former connect to
corresponding plugs on the latter.
5. If a concealed microphone is fitted, solder the leads from the
microphone to the relevant pads on the control-head board. The
pads are shown in
Figure 6.3 .
6. If the speaker leads were originally connected to the control-head
board, as noted in
Subsection 6.2 (on page 131) , then reconnect
the leads. Orient the plug on the leads so that the ridge on one
side of the plug is uppermost.
7. Push the knob onto the shaft of the volume-control
potentiometer. Ensure that the knob turns freely.