Motorola PRO2150, Руководство по обслуживанию, Страница: 18 / 22

August 30, 2002 99R85452E01-O
2-4 Maintenance : Disassembling and Reassembling the Radio — General
2.4.5 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.
2.5 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:
• Phillips screwdriver
• 4mm socket wrench
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.