Motorola iDEN i930 Field Service Manual page 109

MECHANICAL PARTS REWORK AND REPAIR: REWORK PROCEDURE FOR COMPONENTS UNDER SAME SHIELD OF AN
It is mandatory to wear eye protection (Goggles) during cutting procedure.
WARNING:
NOTE: Boards with 72 hours or more of exposition need to be baked for 24 hours @ 125°C
prior to rework.
1. Carefully cut shield (See drawing) using a sharp and pointy cutter to detach shield from epoxy.
Do not use cutter vertical to the board to avoid damaging components with
NOTE:
cutter's tip
2. Pull cut shield and dispose it to a safe container
NOTE: Inspect for:
Additional epoxy (Extend cutting if necessary),
•
Lifted edges (Press them down if necessary),
•
Damaged components, or
•
Metal residues (Blow area if necessary).
•
3. With probe or pick remove epoxy from top of components if any.
4. Place board on fixture
5. Cover with heat-protector # 190532 (It must lay flush to the cut shield)
9.8.2 Shield Removal Procedure
Preparation: Place adequate Nozzle in the hand-piece of the Hot Air Machine. Set desired air
o not use pre-heater acceleration if "X-kar X-1001s" equipment is being
NOTE: D
used.
6. Protect any heat-sensitive component by placing appropriate Heat Shield over (If necessary)
9-12
.
pressure. Set Temperature: Top 330°C – Bottom 100°C
68P80401P03-O