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To replace a daughter board:
1.
Ensure that the control or RF printed circuit board are
mechanically clean.
2.
Insert the daughter board in the required position on the
control or RF board and be sure that it is properly seated.
3.
Solder the daughter board into position.
NOTE
To avoid damage to the main PCB soldering must be
accomplished quickly.
SMD COMPONENT REMOVAL AND
REPLACEMENT
When removing and replacing the SMD components follow
the procedure given below using a soldering iron and a solder
sucker.
To Remove SMD Components
1.
Unsolder the component by heating one pad and using
a solder sucker to remove the solder. Then apply heat
to the other pad and lift the component from the board.
To Replace SMD Components
With the PCB appropriately held in the best position for
repair:
1.
Ensure that all excess solder and old glue is removed
from the board and the pads on the printed circuit board
and component solder pads are mechanically clean.
2.
Centrally locate the component between the printed
circuit board pads.
3.
Using the soldering iron apply sufficient heat to the
SMD component pads and the corresponding printed
circuit board pads to set the component in position.
CAUTION
Do not allow the soldering iron tip to come contact with the
body of the replacement SMD component.
Avoid prolong application of heat to the pads of the
replacement SMD component. Damage to the component
may result.
Do not use SMD components that do not accept solder
properly. They may not function as required or the working
life of the component may be reduced due to chemical
contamination.
PERFORMANCE TEST
AND ALIGNMENT
TEST EQUIPMENT REQUIRED
Either of the following test equipment lists may be used for
test and alignment.
Discrete Test Equipment List
1.
Volt, Ohm and Amp Meter, AVO 8
2.
Power Meter, Bird 43
3.
Power Supply, Farnell LS30-10
4.
Oscilloscope, 20 MHz dual beam
(HAMEG HM203_5)
5.
Frequency Counter, Farnell 600 MHz
6.
AF Signal Generator
7.
RF Signal Generator, Marconi 2018A
8.
Sinadder
9.
Modulation Meter
10. Power Meter
11. Spectrum Analyzer (optional)
12. Coupler
13. 1/4 UNEF to BNC Adaptor, Part No. 344A4209P42
Figure 4 - Discrete List Text Equipment Setup
Figure 5 - Test Set Setup
LBI-38861C
9
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