Service manual

Troubleshooting
Techniques
To troubleshoot a relay multiplexer problem you must first identify the
problem and then isolate the cause of the problem to a replaceable part. See
Chapter 3 - Replaceable Parts for descriptions and locations of Agilent
E1346A replaceable parts.
NOTE
If the problem cannot be isolated to a user-replaceable part shown in Table
3-1 and/or Table 3-2 we suggest you troubleshoot to the component level
and then return the multiplexer to Agilent Technologies for repair. See
Chapter 3 - Replaceable Parts for procedures to return multiplexers to
Agilent Technologies.
Identifying the
Problem
Table 4-1 lists some common symptoms for the relay multiplexers and some
possible solutions. If the problem cannot be identified using these steps,
perform component-level troubleshooting using the component locator
diagram and schematics at the end of this chapter.
Table 4-1. Agilent E1346A Typical Problems
Symptom Possible Solutions
Non-zero error code
in response to
SYST:ERR?
See Appendix C of the Agilent
E1346A Relay Multiplexers
User’s Manual.
Multiplexer not
responding to
commands.
See "Making Visual Checks" in
this chapter
Multiplexer fails
Closed Channel
Resistance Test
(Test 2-1)
Multiplexer fails DC
Isolation Test (Test
2-2)
See "Testing the Multiplexer" in
this chapter
Check user wiring and test fixture
connections.
Making Visual
Checks
Visual checks for the Agilent E1346A multiplexer include the following.
See Table 4-2 for typical symptoms/actions.
• Check switches/jumpers
• Check for heat damage
• Checking terminal block connections
4-4 Service