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3-4
•
To replace a chip component using hot air, select the hot-air hand piece and reflow the solder on
the solder pads to smooth it. Apply a drop of solder paste flux to each pad. using a pair of
tweezers, position the new component in place. Position the hot-air hand piece approximately 1/
8" above the component and begin applying heat. Once the solder wicks to the component,
remove the heat and inspect the repair. All joints should be smooth and shiny.
Shields
Removing and replacing shields will be done with the R-1070 station with the temperature control set
to approximately 415°F (215°C); 445°F (230°C) max.
•
To remove the shield, place the circuit board in the R-1070's holder. Select the proper heat focus
head and attach it to the heater chimney. Add solder paste flux around the base of the shield.
Position the shield under the heat-focus head. Lower the vacuum tip and attach it to the shield by
turning on the vacuum pump. Lower the focus head until it is approximately 1/8" (0.3cm) above
the shield. Turn on the heater and wait until the shield lifts off the circuit board. Once the shield is
off, turn off the heat, grab the part with a pair of tweezers, and turn off the vacuum pump.
Remove the circuit board from the R-1070's circuit board holder.
•
To replace the shield, add solder to the shield if necessary, using a micro-tipped soldering iron.
Next, rub the soldering iron tip along the edge of the shield to smooth out any excess solder. Use
solder wick and a soldering iron to remove excess solder from the solder pads on the circuit
board. Place the circuit board back in the R1070's circuit board holder. Place the shield on the
circuit board using a pair of tweezers. Position the heat-focus head over the shield and lower it to
approximately 1/8" above the shield. Turn on the heater and wait for the solder to reflow. Once
complete, turn off the heat, raise the heat-focus head and wait approximately one minute for the
part to cool. Remove the circuit board and inspect the repair. No cleaning should be necessary.
3.5
Disassembling and Reassembling the Radio — General
Since these radios may be disassembled and reassembled with the use of only four (board to casting)
screws, it is important to pay particular attention to the snaps and tabs, and how parts align with each
other.
The following tools are required for disassembling the radio:
•
Chassis opener
•
Flat bladed screwdriver
•
Philips head screwdriver
If a unit requires more complete testing or service than is customarily performed at the basic level,
send this unit to a Motorola Authorized Service Center. (See Chapter 1 for a list of authorized service
centers.)
The following disassembly procedures should be performed only if necessary:
•
Chassis Assembly and Disassembly
•
Speaker, Microphone, and Universal Connector Flex Disassembly
•
Controller Board Disassembly
•
Control Top Disassembly
Disassembling and Reassembling the Radio — General
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