Tektronix 070-9778-03, Руководство по обслуживанию

Страница: 56 / 119

Maintenance
6–4
TLA 711 Color Benchtop Controller Service Manual
CAUTION. Avoid getting moisture inside the benchtop controller during exterior
cleaning; use just enough moisture to dampen the cloth or swab.
Use only deionized water when cleaning. Use a 75% isopropyl alcohol solution
as a cleanser and rinse with deionized or distilled water.
Do not use chemical cleaning agents; they may damage the chassis. Avoid
chemicals that contain benzene, toluene, xylene, acetone, or similar solvents.
Remove the module cover to access the inside of the benchtop controller for
inspection and cleaning. Refer to the Removal and Installation Procedures
section on page 6–7 for detailed information on cover removal. Inspect the
internal portions of the benchtop controller for damage and wear using Table 6–2
as a guide. Defects found should be repaired immediately.
Table 6–2: Internal inspection check list
Item Inspect for Repair action
Circuit boards Loose, broken, or corroded
solder connections. Burned
circuit boards. Burned, broken,
or cracked circuit-run plating. Return to a Tektronix Service Center.
Resistors Burned, cracked, broken,
blistered condition. Return to a Tektronix Service Center.
Solder connections Cold solder or rosin joints. Return to a Tektronix Service Center.
Capacitors Damaged or leaking cases.
Corroded solder on leads or
terminals. Return to a Tektronix Service Center.
Semiconductors Loosely inserted in sockets.
Distorted pins. Firmly seat loose semiconductors.
Remove devices that have distorted pins.
Carefully straighten pins (as required to fit
the socket), and reinsert firmly. Ensure
that straightening action does not crack
pins, causing them to break off.
Wiring and cables Loose plugs or connectors.
Burned, broken, or frayed
wiring. Firmly seat connectors. Repair or replace
parts with defective wires or cables.
Chassis Dents, deformations, and
damaged hardware. Straighten, repair, or replace defective
hardware.
CAUTION.
To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power to the benchtop controller.
Interior Inspection