Section 4
Service Information
Introduction
This section contains service information for the S46/S46T/S46L. The information is organized as
follows:
•
Handling and cleaning precautions
•
Coaxial switch performance verification
•
•
•
WARNING
No user serviceable parts inside the equipment. The information in this
section is intended only for qualified service personnel. Some of the
procedures may expose hazardous voltages that could result in personal
injury or death. Do not perform these procedures unless you are qualified
to do so.
Handling and cleaning precautions
Because of the high-impedance areas on the S46/S46T/S46L, be careful when handling or
servicing the switch to prevent possible contamination. The following precautions should be
observed when servicing the S46/S46T/S46L.
Handling precautions
Observe the following precautions when handling the S46/S46T/S46L:
•
Do not touch connector insulators.
•
Do not touch any board surfaces or components not associated with the repair.
•
Do not touch areas adjacent to electrical contacts.
•
When servicing the instrument, wear clean cotton gloves.
•
Do not store or operate the S46/S46T/S46L in an environment where dust could settle on
the circuit board.
Circuit board and connector cleaning
•
Use dry nitrogen gas to clean any dust off the circuit board and components.
•
Clean the contaminated area with methanol, then blow-dry the entire board with dry
nitrogen gas.
•
If the connector insulators should become contaminated, either by inadvertent touching, or
from airborne deposits, clean with a cotton swab dipped in clean methanol.
•
Before use, allow items cleaned to dry for several hours in a 50° C low-humidity
environment. Use dry nitrogen to decrease drying time.
