Jumper Flex (on radios shipped prior to 7/94)
Jumper flexes are not available. They are replaced with connectors as described in paragraph “a” of this section. If the jumper flex needs to be replaced, order Interconnect Kit REX4350A. The retrofit kit includes all of the parts required and detailed instructions on the removal of the old jumper flex, and the installation of the new connector arrangement.
RF Switch (S101):Refer to the applicable exploded view and to your radio's RF board (antenna contact area) to locate the RF switch components.
NOTE: The RF switch spring and the RF switch piston must be ordered separately.
To Remove the RF Switch: 1. On VHF and UHF radios, unsolder the two tabs of the RF switch bracket that secure the RF switch to the RF board. On 800MHz and 900MHz radios, use a #2 slotted screwdriver to straighten the two tabs of the RF switch bracket that wrap around the RF board. Use your forefinger to hold the RF switch bracket to the RF board while straightening the tabs to avoid lifting the solder tabs on the opposite end of the RF switch bracket.
2.Refer to Figure 16 and use a small
3 Solder
Tabs
Figure 16 Solder Tabs
3.Carefully lift the RF switch assembly away from the rf board. Notice that the RF switch circuit board remains attached (soldered) to the RF board.
4.Using the same
5.In the RF switch circuit board area, reflow all the solder pad areas on the main RF board such that similarly shaped pads have uniform solder heights. Add or remove solder as required. Clean the RF board thoroughly. Then swab on a minimum amount of flux to each of the solder pads.
To Replace the RF Switch: 1. Place the RF switch assembly on the RF main board and gently heat. Visually inspect to make sure no flux migrated onto the gold plated areas of the RF switch board. The guide pins should provide self alignment between the two circuit boards. Visually inspect the
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