Motorola HT-1000 Service Manual page 66

Jumper Flex (on radios
shipped prior to 7/94)
RF Switch (S101):
To Remove the RF Switch:
To Replace the RF Switch:
44
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.
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.
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 heat-focus head to distribute
heat over the area occupied by the three solder tabs until the
solder softens.
3 Solder
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 heat-focus head as in steps (2) and (3), unsolder
the RF switch circuit board, and remove it from the RF board using
forceps.
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.
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
Tabs
Figure 16 Solder Tabs