Maintenance
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
6-5
CAUTION. Improper cleaning agents or methods can damage the flat panel
display.
Avoid using abrasive cleaners or commercial glass cleaners to clean the display
surface.
Avoid spraying liquids directly on the display surface.
Avoid scrubbing the display with excessive force.
Clean the flat panel display surface by gently rubbing the display with a
clean-room wipe (such as Wypall Medium Duty Wipes, #05701, available from
Kimberly-Clark Corporation).
If the display is very dirty, moisten the wipe with distilled water or a 75%
isopropyl alcohol solution and gently rub the display surface. Avoid using excess
force or you may damage the plastic display surface.
CAUTION. To pr event getting moisture inside the instrument during external
cleaning, use only enough liquid to dampen the cloth or applicator.
Inspection — Interior. To access the inside of the instrument for inspection and
cleaning, refer to the Removal and Installation Procedures in this section.
Inspect the internal portions of the instrument for damage and wear, using
Table 6--2 as a guide. Defects found should be repaired immediately.
If any circuit board is repaired or replaced, check Table 6--2 in Section 5 to see if
it is necessary to adjust the instrument.
CAUTION. To pr event damage fr om electrical ar cing, ensure that circuit boards
and components are dry before applying power to the instrument.
Table 6- 2: Internal inspection check list
Item Inspect for Repair action
Circuit boards Loose, broken, or corroded
solder connections. Burned
circuit boards. Burned, broken, or
cracked ci rcuit-run plating.
Remove and replace damaged
circuit board.
Resistors Burned, cracked, broken,
blistered condition.
Remove and replace damaged
circuit board.
Solder connections Cold solder or rosin joints. Resolder joint and clean wit h
isopropyl alcohol.
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