Testing Assemblies - HP E1411A Service Manual

Testing Assemblies

NOTE
Chapter 8
Performance Out of Specification
If the multimeter performance is out of specification limits, use the
adjustment procedures in Chapter 5 - Adjustments to correct the problem. If
the condition repeats, see "Testing Assemblies" to troubleshoot the
multimeter.
You can use the tests and checks in Table 8-3 to isolate the problem to a
user-replaceable part on the multimeter frame or PCA. See Figure 6-1 (HP
E1411A) or Figure 6-2 (HP E1411B) in Chapter 6 - Replaceable Parts for
locations of user-replaceable parts.
If the problem cannot be traced to a user-replaceable part listed in Table
6-1 or Table 6-2, return the multimeter to Hewlett-Packard for exchange.
See Chapter 6 - Replaceable Parts for procedures.
Table 8-3. HP E1411 Tests/Checks
Test/Check Reference Designator
Heat Damage - - - - - - - - - -
Switch/Jumper JM1, JM3, P3
Settings SP1
Frame CBL1, CBL2
MP3, MP4, MP5, MP6
A1 Printed F1, F2
Circuit J2, J102, J103, J301
Assembly K104, K105, K106
P1,P2
XU23, XU104, XU124
Checking Heat Damage
Inspect the multimeter for signs of abnormal internally generated heat such
as discolored printed circuit boards or components, damaged insulation, or
evidence of arcing. If there is damage, do not operate
the multimeter until you correct the problem.
Check:
Discolored PC boards
Damaged insulation
Evidence of arcing
IRQ Level setting
LADDR setting
Cable contact damage
Panel binding posts
Fuse continuity
Mating connector contacts
Relay opening/closure
Connector contacts
IC contact/connections
Service 59