GPH-CMD VHF Radio Maintenance
BK RADIO Page 5-3
I. Insulators
Inspect insulators for evidence of damage, such as broken or chipped edges, burned areas
and presence of foreign matter.
J. Jacks
Inspect all jacks for corrosion, rust, deformations, loose or broken parts, cracked insulation,
bad contacts, or other irregularities.
K. Potentiometers
Inspect all potentiometers for evidence of damage or loose terminals, cracked insulation, or
other irregularities.
L. Resistors, Fixed
Inspect the fixed resistors for cracked, broken, blistered, or charred bodies, and loose,
broken, or improperly soldered connections. On surface mount resistors, be especially alert
for hairline cracks in the body and broken terminations.
M. 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.
4. Inspect for corrosion at the terminal.
N. Wiring/Coaxial Cable
Inspect wiring in chassis for breaks in insulation, conductor breaks, cut or broken lacing,
and improper dress in relation to adjacent wiring or chassis.
5.3.2 CLEANING
A. Using a clean, lint-free cloth, lightly moistened with soap and water only, and remove the
foreign matter from the equipment case and unit front panel. Wipe dry using a clean, dry,
lint-free cloth.
B. Using a hand controlled dry-air jet (not more than 15 psi), blow the dust from inaccessible
areas. Care should be taken to prevent damage by the air blast.
C. Clean the receptacles and plugs with a hand-controlled dry-air jet (not more than 25 psi),
and a clean, lint-free cloth lightly moistened with soap and water only. Wipe dry with a
clean, dry, lint-free cloth.
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