Maintenance
Table 17: Inter
nal inspection checklist
Item Inspect for Repair action
Circuit boards
Loose, broken
, or corroded solder
connections. Burned circuit boards.
Burned, broken, or cracked circuit-run
plating.
Remove and rep
lace damaged circuit board.
Resistors Burned, cracked, broken, blistered
condition.
Remove and replace damaged circuit board.
Solder conn
ections
Cold solder
or rosin joints.
Resolder joint and clean with isopropyl
alcohol.
Capacitor
s
Damaged or
leaking c ases. Corroded
solder on leads or terminals.
Remove and replace damaged circuit board.
Wiring and
cables
Loose plug
s or connectors. Burned, broken,
or frayed wiring.
Firmly sea
t connectors. Repair or replace
modules with defective wires or cables.
Chassis Dents, deformations, and damaged
hardware.
Straighten, repair, or replace defective
hardware.
Cleaning Proced ure,
Interior
To clean the oscilloscope interior, perform the following steps:
1. Blow off dust with dry, low-pressure, deionized air (approximately 9 psi).
2. Remove any remaining dust with a lint-free cloth dampened in isopropyl
alcohol (75% solution) and then wipe with a lint-free cloth dampened with
warm deionized water. A cotton-tipped applicator is useful for cleaning in
narrow spaces and on circuit boards.
STOP. If, after performing steps 1 and 2, a module is clean on inspection, skip
steps 3, 4, a nd 5. Proceed with step 6.
3. If steps 1 and 2 do not remove all the dust or d irt, all modules in the
oscilloscope except the Display Module and Front Panel Module may b e
spr
ay washed using a solution of 75% isopropyl alcohol.
During cleaning of the Acquisition board (Main board), make sure that
no
residue is left in the attenuators. Debris or residue can c ause several
problems with signal fidelity that cannot be corrected by calibration.
When handling the board, avoid handling the attenuators since skin oils
may cause problems.
Extensive cleaning of the Display M odule is difficult because water must
not be trapped between the display shield and the display. The polarizers
integrated into the display degrade with long-term exposure to water. The
display shield and display must be re placed as an ass embly if significa nt
moisture or debris become trapped inside. Cotton tipped applicators and
52 TDS2000C and TDS1000C-EDU Series Oscilloscope Service Manual
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