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Corrective Maintenance
CSA 803A Service Manual
6Ć71
Figure 6Ć31:ăIC InsertionĆExtraction Tool
ăStep 4:ăUpgrade the A18 Memory board firmware as follows:
H Remove the A18 Memory board from the card cage. The A18
Memory board is typically located one slot from the outside (left
side) of the instrument.
H On the A18 Memory board, replace the following ICs:
U800 U900
U812 U910
U820 U920
U830 U930
In each case, the last twoĆdigits of the part number on the replaceĆ
ment IC should be the same as, or higher than, that on the removed
IC. Again, ensure that pin 1 is oriented correctly.
H Return the A18 Memory board to its former location in the card
cage.
ăStep 5:ăUpgrade the A5 Time Base/Controller board firmware as folĆ
lows:
H Locate U300, U310, U400 and U410 on the A5 Time Base/Controller
board (see Figure 6Ć30). These components are found near the
bottom front of the instrument with the instrument positioned on its
right side.
H Replace U300, U310, U400 and U410 on the A5 Time Base/ControlĆ
ler board.
The last twoĆdigit portion of the part number on the replacement IC
should be the same as, or higher than, that on the removed IC.
Again, ensure that pin 1 is oriented correctly.