Shields; Shield Removal; Shield Replacement - Motorola GTX/LCS 2000 Service Manual

Shields

Shield Removal

Shield Replacement

head over the OMPAC and lower it to approximately 1/8" (0.3cm) over the carrier.
Using the same heat and airflow setting used to remove the OMPAC, turn on the
heater and wait for the carrier to reflow (heating and reflow should take longer
than 60 seconds).
Once the carrier reflows, 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.
Removing and replacing the shields will be done with the R-1070A, using the
same heat and airflow profile used to remove and replace OMPAC components.
Place the circuit board in the R-1070A'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-1070A'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 R-1070A'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 heatfocus head, and wait approximately
one minute for the part to cool. Remove the circuit board and inspect the repair.
No cleaning should be necessary.
Basic Maintenance 2-5