Maintenance
6-4
TDS5000B Series Service Manual
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 prevent getting moisture inside the oscilloscope duri ng external
cleaning, use only enough liquid to dampen the cloth or applicator.
Inspection — Interior. To access the inside of the oscilloscope for i nspection and
cleaning, refer to the Removal and Installation Procedures in this section.
Inspect the internal portions of t he oscilloscope for damage and wear, using
Table 6--2 as a guide. Defects found shoul d 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 oscilloscope.
CAUTION. To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power t o the oscilloscope.
Table 6- 2: Internal inspection check list
Item Inspect for Repair action
Circuit boards Loose, broken, or corroded
solder connecti ons. Burned
circuit boards. Burned, broken, or
cracked circuit-run plati ng.
Remove and replace damaged
circuit board.
Resistors Burned, cracked, broken, blis-
tered condition.
Remove and replace damaged
circuit board.
Solder connecti ons Cold solder or rosin joints. Resolder joint and clean with
isopropyl alcohol.
Capacitors Damaged or leaking cas es.
Corroded solder on leads or
terminals.
Remove and replace damaged
circuit board.
Semiconductors Loosely inserted in sockets.
Distorted pins.
Firmly seat loose semiconduc-
tors. Remove device s that have
distorted pins. Carefully straight-
en pins (as required to fit the
socket), using long-nose pliers,
and reinsert firmly. Ensure that
straightening action does not
crack pins, causing them to
break off.
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