Maintenance
6-4
TDS7104 & TDS7054 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 during external
cleaning, use only enough liquid to dampen the cloth or applicator.
Inspection — Interior. To access the inside of the oscilloscope for inspection and
cleaning, refer to the Removal and Installation Procedures in this section.
Inspect the internal portions of the oscilloscope for damage and wear, using
Table 6--2 as a guide. Defects found should be repaired immediately.
If any circuit board is 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, ensur e that circuit boards
and components are dry before applying power to the oscilloscope.
Table 6- 2: Internal inspection check list
Item Inspect for Repair action
Circuit boards Loose, broken, or corroded
solder connect ions. Burned
circuit boards. Burned, broken, or
cracked circuit -run pl ating.
Remove and replace damaged
circuit board.
Resistors Burned, cracked, broken, blis-
tered condition.
Remove and replace damaged
circuit board.
Solder connect ions Cold solder or rosin joints. Resolder joint and clean with
isopropyl alcohol.
Capacitors Damaged or leaking cases.
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 devices that have
distorted pins. Carefully straight -
en pi ns (as required to fit the
socket), using long-nose pliers,
and reinsert firmly. Ensure that
straight ening act ion does not
crack pins, causing them to
break off.
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