TM9100 Service Manual General Information 107
© Tait Electronics Limited August 2005
4.5 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 num-
ber 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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