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," or Appendix B, "Backdating Information,"
for descriptions and locations of replaceable parts, depending on the serial
number of your multiplexer.
NOTE If the problem cannot be isolated to a user-replaceable part, we suggest you
return the multiplexer to Hewlett-Packard for repair, or order a replacement
assembly. See Chapter 1, "General Information," for procedures to return
multiplexers to Hewlett-Packard. See Chapter 3, "Replaceable Parts," for
information on ordering replaceable parts.
Identifying the
Problem
Table 4-2 lists some common problems for the relay multiplexers, along
with symptoms and possible solutions. If the problem cannot be identified
using these steps, perform component-level troubleshooting using the parts
locator diagram in Chapter 3 (Figure 3-1) and the schematic diagrams
located at the back of this manual.
Table 4-2. E1343A/44A/45A/47A/55A/56A Typical Problems
Problem Type Symptom Possible Solutions
Operator Errors Non-zero error code in
response to SYST:ERR?
For E1343A/44A/45A/47A, see
Appendix C of the
E1343A/E1344A/E1345A/E1347A Relay
Multiplexers User’s Manual
For E1355A/56A, see Appendix E of
the E1355A - E1358A Strain Gage
Multiplexers User’s Manual
Catastrophic
Failure
Multiplexer not
responding to
commands.
See "Making Visual Checks" in this
chapter
Performance
Out of
Specification
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.
56 Service Chapter 4