Tait TB8100, Service Manual

Page: 82 / 306

82 Reciter Fault Finding TB8100 Service Manual
© Tait Electronics Limited September 2006
3.6 Visual Inspection
The following procedures are intended as a guide for quickly finding basic
faults in the reciter before proceeding to the more detailed checks. The
circled numbers in the following instructions refer to
Figure 3.5 on page 83 .
Task 1 —
Check for Physical
Damage, Missing or
Misplaced
Components
1. Remove the covers.
2. Has the reciter been dropped? Inspect the covers, front and rear
panels, and heatsink for damage. Check each board for loose or
missing components. If the digital board or RF board is damaged,
return the complete reciter to your nearest CSO for repair or
replacement.
3. Check that the flexible connectors
b
are correctly positioned and
latched in their sockets (refer to Figure 5.2 on page 107 ).
4. Check that all coaxial cables
c d e
are connected securely to the
correct connectors.
5. Check that all screws are in place and secured correctly. Refer to
“Screw Torque Settings” on page 100 .
Task 2 —
Check Quality of
Solder Joints
1. Check the power supply circuitry
f
on the RF board for shorts or
dry joints.
2. Check the pins of the large ICs on the digital board for shorts or
faulty solder joints.
3. Check the overall quality of the solder joints.
Task 3 —
Check RF
Connectors
1. Check the SMA connector solder joint
g
.
2. Check that the nuts securing the BNC/TNC connectors
h i
are
tightened correctly. Refer to “Screw Torque Settings” on page 100 .