Programming instructions

Service 79
Chapter 5
Service
Introduction
This Chapter provides general service related information about the Agilent
3499A/B/C Switch/Control System. This includes safety considerations,
static-handling procedures, and problem isolation processes. Chapter
contents include:
• Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 79
• Static Handing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 79
• Agilent 3499A/B/C Problem Isolation . . . . . . . . . . . . . . . . . Page 80
• Mainframe Problem Isolation . . . . . . . . . . . . . . . . . . . . . . . . Page 81
Safety Considerations
Only service trained personnel should attempt to repair the Agilent
3499A/B/C. There are two places in the Agilent 3499A/B/C where
dangerous voltages may exist. The ac line voltage exists in the Agilent
3499A/B/C mainframe around the areas of the line input filter, line power
switch and the power supply assembly. This potentially lethal voltage can
only be contacted if the covers are removed.
The other potentially lethal voltage may exist at the plug-in module wiring
terminal block. This voltage is generated externally to the Agilent
3499A/B/C. Consult the system installer before attempting to remove the
Agilent 3499A/B/C and its plug-in modules from the system.
WARNING Only personnel with a knowledge of electronic circuitry and an
awareness of the hazards involved could install, reconfigure, or
make any repairs to the Agilent 3499A/B/C mainframe or its
plug-in modules.
Static Handing
Static electricity is a familiar phenomenon which, except for an occasional
shock, doesn’t seem very serious. However, it has been proven that in the
electronics industry electrostatics discharge (ESD) is a major cause of
component failure. In many cases, the component damaged may not
immediately fail, causing low instrument reliability and unnecessary repairs
at a later time. ESD damage can occur at static levels too low for human
perception. Additionally, it has been shown that ESD can affect both passive
and active devices.