Sony Tektronix WFM 1125, Руководство по обслуживанию

Страница: 119 / 172

Maintenance
WFM 1125 Option 0A/0B/0C/0D Service Manual
6-5
3. Clean the light filter protecting the monitor screen with a lint-free cloth
dampened with either isopropyl alcohol or, preferably, a gentle, general
purpose detergent-and-water solution.
CAUTION.
To prevent getting moisture inside the waveform monitor during
external cleaning, use only enough liquid to dampen the cloth or applicator.
Inspection Ċ Interior.
To access the inside of the waveform monitor for inspection
and cleaning, refer to the Removal and Installation Procedures in this section.
Inspect the internal portions of the waveform monitor for damage and wear,
using Table 6–3 as a guide. Defects found should be repaired immediately.
If any electrical module is repaired or replaced, refer to Section 5 to see if it is
necessary to adjust the waveform monitor.
CAUTION.
To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power to the waveform monitor.
Table 6-3: Internal Inspection check list
Item Inspect for Repair action
Circuit boards Loose, broken, or corroded solder
connections. Burned circuit
boards. Burned, broken, or
cracked circuitĆrun plating.
Remove failed module and
replace with a fresh module.
Resistors Burned, cracked, broken, blisĆ
tered condition.
Remove failed module and
replace with a fresh 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 damaged module and
replace with a fresh module from
the factory.
Semiconductors Loosely inserted in sockets.
Distorted pins.
Firmly seat loose semiconducĆ
tors. Remove devices that have
distorted pins. Carefully straightĆ
en pins(asrequired to fit the
socket), using longĆnose pliers,
and reinsert firmly. Ensure that
straightening action does not
crack pins, causing them to break
off.