Tait TM9100 Service Manual

Also see for TM9100: Installation guide User guide Installation guide Safety information User guide

Contents

Tait TM9100 Service Manual Manual pdf 107 page image

TM9100 Service Manual General Information 107© Tait Electronics Limited August 20054.5 Replacing Board ComponentsThis section describes the procedure for obtaining the correctreplacement 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 componentThe technical notes will indicate whether there have been any changesaffecting the component in question.IdentifyPCB Information Identify the IPN of the PCB and compare the issue number with that inthe PCB information supplied with the service documentation.Note The IPN is the ten-digit number printed at one corner of theboard. 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 theissue number indicates that the board is either an earlier or a later version,obtain the PCB information for the board under repair from theTechnical Support website (support.taitworld.com).Tip Print and store a copy of every PCB information published onthe Technical Support website.Identify ReplacementComponent After locating the correct PCB information for the board, consult theBOM for the board. Identify the component in question in the BOM.Note, however, that a new PCB information is published only wheneverthere is a major change in the design of the board. A major changenormally involves a change in the layout of the PCB, which requires thatthe issue number in the IPN be incremented. Any minor changesfollowing a major change (and preceding the next major change)normally involve only changes in the components on the board. Suchminor changes might affect the component in question. To determine ifthis is the case, consult any technical notes that might apply to the boardas described below.Consult Technical Notes A technical note about each major change is published on the TechnicalSupport website (support.taitworld.com). Technical notes giving detailsof any intervening minor but important changes are also published. It isadvisable to print and store a copy of every technical note published.Obtain ReplacementComponent Determine if the required replacement component is included in one ofthe spares kits. (Check with TEL regarding the availability of the kit.)If the required component is not included in a kit, order the componentfrom a CSO or, in the case of a CSO, from TEL. Always ensure that thereplacement component has the identical specification to that given inthe BOM. It is particularly important for the tolerances to be the same.