6881096C77-O September 26, 2003
Troubleshooting: Replacing the Control-Head Board 5-9
7. Carefully separate the PC board, internal spacer, and elastomer keypad assembly from the
front panel.
- On rotary control-head models, care must be taken not to damage the flex circuit when
separating the printed circuit board from the front housing. Do not disturb the buttons in the
front panel.
- On rotary control-head models, the flex circuit must also be unplugged.
8. On rotary control-head models, desolder the XMIT and BUSY LED before removing the
elastomer keypad.
9. Remove the elastomer keypad from the PC board.
NOTE:Before you unsnap the PC board, note that the board slips under a hook on the right
and snaps on the left. This will facilitate the assembly.
10. Remove the PC board from the internal spacer. The PC board snaps into and out of the
spacer.
11. To reassemble, snap the PC board into the internal spacer. Before you press the elastomer
keypad into the board, make sure that the conductive pads in the board and the elastomer
keypad are clean and free of any foreign material.
12. On rotary control head models, solder the XMIT and Busy LEDs onto the PC board.
NOTE:On rotary control head models, the flex circuit must be connected to the PC board
prior to attaching the PC board to the spacer.
13. Install the PC board internal spacer and elastomer keypad assembly into the front panel.
Replace the screws and torque them to 6-8 in.-lbs.
14. Do one of the following:
- For dash-mounted radios, plug the interconnect board into the radio, and then plug in the
control-head assembly and fasten it with the two front-panel screws (torqued to 4-6 in.-lbs).
- For remote-mount control heads, replace the front panel into the remote control-head back
housing, make sure the gasket is in place, and then torque the screws to 4-6 in.-lbs.
Replace any plugs and cables on the rear of the control head.
Take care to avoid misalignment of connector pins. On dash mount
radios, remove the radio top cover to allow visual inspection during
connector alignment.
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