User's Manual

Maintenance GMH Series VHF Radio
Page 5-2 BK RADIO
5.2.1.2 Capacitors, Variable
Inspect trimmers for chipped and cracked bodies, damaged dielectrics, and damaged contacts.
5.2.1.3 Chassis
Inspect the chassis for deformation, dents, punctures, badly worn surfaces, damaged connectors,
damaged fastener devices, loose or missing hardware, component corrosion, and damage to the finish.
5.2.1.4 Connectors
Inspect connectors for broken parts and other irregularities. Inspect for cracked or broken insulation and
for contacts that are broken, deformed, or out of alignment. Also, check for corroded or damaged plating
on contacts and for loose, improperly soldered, broken, or corroded terminal connections.
5.2.1.5 Covers and Shields
Inspect covers and shields for punctures, deep dents, and badly worn surfaces. Also, check for damaged
fastener devices, corrosion, and damage to finish.
5.2.1.6 Flex Circuits
Inspect flex circuits for punctures and badly worn surfaces. Check for broken traces, especially near the
solder contact points.
5.2.1.7 Fuse
Inspect for blown fuse and check for loose solder joints.
5.2.1.8 Insulators
Inspect insulators for evidence of damage, such as broken or chipped edges, burned areas, and presence
of foreign matter.
5.2.1.9 Jacks
Inspect all jacks for corrosion, rust, deformations, loose or broken parts, cracked insulation, bad contacts,
or other irregularities.
5.2.1.10 Resistors, Fixed
Inspect the fixed resistors for cracked, broken, blistered, or charred bodies and loose, broken, or
improperly soldered connections. On chip resistors, be especially alert for hairline cracks in the body and
broken terminations.
5.2.1.11 RF Coils
Inspect all RF coils for broken leads, loose mountings, and loose, improperly soldered, or broken terminal
connections. Check for crushed, scratched, cut, or charred windings. Inspect the windings, leads,
terminals, and connections for corrosion or physical damage. Check for physical damage to forms and
tuning slug adjustment screws.
5.2.1.12 Terminal Connections, Soldered
1. Inspect for cold-soldered or resin joints. These joints present a porous or dull, rough appearance.
Check for strength of bond using the points of a tool.
2. Examine the terminals for excess solder, protrusions from the joint, pieces adhering to adjacent
insulation, and particles lodged between joints, conductors, or other components.
3. Inspect for insufficient solder and unsoldered strands of wire protruding from conductor at the terminal.
Check for insulation that is stripped back too far from the terminal.