Tektronix LTA7P Series, Service Manual

Page: 112 / 172

Maintenance
6- 4
TLA7Nx, TLA7Px, & TLA7Qx Logic Analyzer Module Service Manual
Table 6- 2: Internal inspection check list (Cont.)
Item Repair action Inspect for
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 failed circuit board and
replace with a new one.
Semiconductors Damaged parts or distorted pins. Replace circuit board if parts are
damaged.
Wiring and cables Loose plugs or connectors.
Burned, broken, or frayed wiring. Firmly seat connectors. Repair or
replace circuit boards with defec-
tive wires or cables.
CAUTION.
To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power to the logic analyzer module.
To clean the 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 rinse with warm deionized water. (A cotton-
tipped applicator is useful for cleaning in narrow spaces and on circuit
boards.)
NOTE
. If, after performing steps 1 and 2, a module is clean upon inspection, skip
the remaining steps. If steps 1 and 2 do not remove all the dust or dirt, the
module may be spray washed using a solution of 75% isopropyl alcohol (see
steps 3 through 7).
3. Gain access to the parts to be cleaned by removing easily accessible shields
and panels (see
Removal and Installation Procedures on page 6--5).
4. Spray wash dirty parts with the isopropyl alcohol and wait 60 seconds for the
majority of the alcohol to evaporate.
5.
Use warm (48.9
_
C to 60
_
C / 120
_
F to 140
_
F) deionized water to
thoroughly rinse the parts.
6. Dry all parts with low-pressure, deionized air.
7. Dry all components and assemblies in an oven or drying compartment using
low-temperature (51.7
_
C to 65.6
_
C / 125
_
F to 150
_
F) circulating air.
Interior Cleaning
Procedure