Introduction
This section contains service information for the Model 7999-4. The information is orga-
nized as follows:
•
Handling and cleaning precautions
•
Performance verification
•
Component replacement
WARNING
The information in this section is intended only for qualified service per-
sonnel. Some of the procedures may expose you to 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 Model 7999-4, care should be taken when han-
dling or servicing the switch to prevent possible contamination. The following precautions
should be observed when servicing the switch.
Handling precautions
Observe the following precautions when handling the SPDT switch:
•
Handle the switch only by the edges and cover.
•
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 switch, wear clean cotton gloves.
•
Do not store or operate the switch in an environment where dust could settle on the
circuit board.
Card 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 air-borne deposits, they can be cleaned 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.
Содержание 7999-4
Страница 1: ...Contains Operating and Servicing Information Model 7999 4 Microwave Switch Instruction Manual...
Страница 12: ...1 GeneralInformation...
Страница 16: ...2 Connections...
Страница 22: ...3 Operation...
Страница 25: ...3 4 Operation 1 1 Figure 3 2 Jumper location...
Страница 29: ...4 ServiceInformation...
Страница 34: ...5 ReplaceableParts...
Страница 38: ......
Страница 41: ...Keithley Instruments Inc 28775 Aurora Road Cleveland Ohio 44139 Printed in the U S A...