HP E1411A, Service Manual

Page: 60 / 78

Checking Switches/Jumpers
Verify the logical address setting is set correctly (factory set at 24). Verify
the interrupt priority jumpers are set correctly (factory set at level 1). See
the HP E1326A/E1411A User’s Manual or the E1326B/E1411B User’s
Manual for information.
Testing Multimeter Frame
To test the multimeter frame, see Table 8-3 for guidelines to check binding
posts MP3, MP4, MP5, and MP6, and cables CBL1 and CBL2. If you need
to remove and/or replace the binding posts, see "Removing Binding Posts"
in this chapter.
Testing Printed Circuit Assembly
To test the PCA, remove mainframe power and remove the multimeter from
the mainframe. Next, remove the Top Shield (see "Removing Top Shield"
for instructions). Then, see Table 8-3 for guidelines to isolate the problem to
a user-replaceable part.
Repair
Guidelines
This section gives guidelines to repair the HP E1411 multimeter, including:
•
ESD precautions
•
Removing top shield
•
Removing front panel/bottom shield
•
Removing binding posts
•
Soldering printed circuit boards
•
Post-repair safety checks
ESD Precautions
Electrostatic discharge (ESD) may damage MOS, CMOS and other
static-sensitive devices in the HP E1411 multimeter. This damage can range
from slight parameter degradation to catastrophic failure. When handling
multimeter assemblies, follow these guidelines to avoid damaging
multimeter components:
•
Always use a static-free work station with a pad of conductive
rubber or similar material when handling multimeter components.
•
After you remove an assembly from the multimeter, place the
assembly on a conductive surface to guard against ESD damage. Do
not stack assemblies.
60 Service Chapter 8