86 General Information TB7100 Service Manual
© Tait Electronics Limited October 2005
6.5 Replacing Board Components
This section describes the procedure for obtaining the correct replacement
for any faulty component on the boards.
■ identify version of PCB information applicable to board
■ identify replacement component in BOM of PCB information
■ consult technical notes
■ obtain replacement component
The technical notes will indicate whether there have been any changes
affecting the component in question.
Identify
PCB Information
Identify the IPN of the PCB and compare the issue number with that in the
PCB information supplied with the service documentation.
Note The IPN is the ten-digit number printed at one corner of the
board. The last two digits in the IPN represent the issue number
of the PCB.
If the issue numbers match, consult the BOM as described below. If the issue
number indicates that the board is either an earlier or a later version, obtain
the PCB information for the board under repair from the Technical Support
website (support.taitworld.com).
Tip Print and store a copy of every PCB information published on the
Technical Support website.
Identify
Replacement
Component
After locating the correct PCB information for the board, consult the BOM
for the board. Identify the component in question in the BOM.
Note, however, that a new PCB information is published only whenever
there is a major change in the design of the board. A major change normally
involves a change in the layout of the PCB, which requires that the issue
number in the IPN be incremented. Any minor changes following a major
change (and preceding the next major change) normally involve only
changes in the components on the board. Such minor changes might affect
the component in question. To determine if this is the case, consult any
technical notes that might apply to the board as described below.
Consult Technical
Notes
A technical note about each major change is published on the Technical
Support website (support.taitworld.com). Technical notes giving details of
any intervening minor but important changes are also published. It is
advisable to print and store a copy of every technical note published.
Obtain
Replacement
Component
Determine if the required replacement component is included in one of the
spares kits. (Check with TEL regarding the availability of the kit.)
If the required component is not included in a kit, order the component
from a CSO or, in the case of a CSO, from TEL. Always ensure that the
replacement component has the identical specification to that given in the
BOM. It is particularly important for the tolerances to be the same.
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