Repair Procedures And Techniques - General - Motorola GP300 Series Basic Service Manual

Repair Procedures and Techniques — General
4.0 Repair Procedures and Techniques — General
NOTE Environmentally Preferred Products (EPP) (refer to the marking on the printed circuit
boards) were developed and assembled using environmentally preferred components
and solder assembly techniques to comply with the European Union's ROHS and WEEE
directives (Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC
and Restriction of Hazardous Subtances (ROHS) Directive 2002/95/EC). To maintain
product compliance and reliability, use only the Motorola specified parts in this manual.
For the identification of lead (Pb) free assemblies, all EPP products will carry the EPP
Marking, shown below, on the printed circuit board (PCB). This marking provides infor-
mation to those performing assembly, servicing and recycling operation on this product,
adhering to the JEDEC standard #97. The EPP Marking takes the form of a label or
marking on the PCB.
Parts Replacement and Substitution
When damaged parts are replaced, identical parts should be used. If the identical replacement part
is not locally available, check the parts list for the proper Motorola part number and order the part
from the nearest Motorola Communications parts centre listed in the "Piece Parts" section of this
manual.
Rigid Circuit Boards
This family of radios uses bonded, multi-layer, printed circuit boards. Since the inner layers are not
accessible, some special considerations are required when soldering and unsoldering components.
The printed-through holes may interconnect multiple layers of the printed circuit. Therefore, exercise
care to avoid pulling the plated circuit out of the hole.
When soldering near the 20-pin and 40-pin connectors:
❏
Avoid accidentally getting solder in the connector.
❏
Be careful not to form solder bridges between the connector pins.
❏
Examine your work closely for shorts due to solder bridges.
Flexible Circuits
The flexible circuits are made from a different material than the rigid boards, and require different
soldering techniques. Excessive prolonged heat on a flexible circuit can damage the material.
Therefore, avoid excessive heat and excessive bending.
For parts replacement, use the ST-1087 Temperature-Controlled Solder Station with a 600-700
degree tip, and use small diameter solder such as ST-633. The smaller size solder will melt faster
and require less heat to be applied to the circuit.
To replace a component on a flexible circuit:
1. Grasp with seizers (hemostats) the edge of the flexible circuit near the part to be removed.
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