Tektronix DPO3000 Series, Service Manual

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Maintenance
CAUTION.
To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power to the oscilloscope.
Table 4-2: Internal inspection check list
Item Inspect for Repair action Repair action
Circuit boards Loose, broken, or corroded
solder connections.
Burned circuit boards.
Burned, broken, or cracked
circuit-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
with isopropyl alcohol.
Capacitors Damaged or leaking cases.
Corroded solder on leads or
terminals. Remove and replace
damaged circuit board.
Wiring and cables Loose plugs or connectors.
Burned, broken, or frayed
wiring. Firmly seat connectors.
Repair or replace modules
with defective wires or
cables.
Chassis Dents, deformations, and
damaged hardware. Straighten, repair, or replace
defective hardware.
Cleaning Procedure — Interior.
To clean the oscilloscope interior, do the following
steps:
1. Blow off dust with dry, low-pressure, deionized air (approximately 9 psi).
2. 2. Remove any remaining dust with a lint-free cloth dampened in isopropyl
alcohol (75% solution) and rinsed with warm deionized water. (A
cotton-tipped applicator is useful for cleaning in narrow spaces and on circuit
boards.)
NOTE.
If, after doing steps 1 and 2, a module is clean upon inspection, skip the
following steps.
If there is still dust or dirt on the module, the oscilloscope may be spray washed
using a solution of 75% isopropyl alcohol by doing the following steps:
4–4 MSO3000 and DPO3000 Series Digital Phosphor Oscilloscopes Service Manual