Motorola GM140 Manual de serviço básico - Página 19

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Repair Procedures and Techniques — General

4.0

Repair Procedures and Techniques — General

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 center 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.

5.0

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:

Small flat blade screwdriver

Dismantling Tool (Motorola Part No. 6686119B01)

TORX™ T20 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:

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