Maintenance
6–4
TDS 340A, TDS 360 & TDS 380 Technical Reference
Table 6–2: Internal inspection check list
Item Inspect for Repair action
Circuit boards Loose, broken, or corroded solder connec-
tions. Burned circuit boards. Burned, broken,
or cracked circuit-run plating
Remove the failed module and replace it with
a new module
Resistors Burned, cracked, broken, or blistered condition Remove the module with the faulty resistor
and replace it with a new module
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 the module with the faulty capacitor
and replace it with a new module from the
factory
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 and deformations Straighten, repair, or replace chassis
STOP. If, after doing steps 1 and 2, a module is clean upon inspection, skip the
remaining 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 rinse with warm deionized water. (A cotton-
tipped applicator is useful for cleaning in narrow spaces and on circuit
boards.)
NOTE. If steps 1 and 2 do not remove all the dust or dirt, the oscilloscope may be
spray washed using a solution of 75% isopropyl alcohol by doing steps 3
through 7.
3. Gain access to the parts to be cleaned by removing easily accessible shields
and panels (see Removal and Replacement procedures).
4. Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for the
majority of the alcohol to evaporate.
5. Use hot (120_ F to 140_ F or 48.9_ C to 60_ C) deionized water to
thoroughly rinse them.
6. Dry all parts with low-pressure, deionized air.
7. Dry all components and assemblies in an oven or drying compartment using
low-temperature (125_ F to 150_ F or 51.7_ C to 65.5_ C) circulating air.
Cleaning Procedure —
Interior
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