Service manual

Making Visual
Checks
Visual checks for the FET Multiplexers include the following. See
Table 4-2 for typical checks.
• Check switches/jumpers
• Check for heat damage
• Checking connector contacts
NOTE
See the appropriate FET Multiplexer User’s Manual for information on
logical address and IRQ settings. If there are no apparent problems
following the visual checks, run the Performance Verification Tests in
Chapter 2 to see if the module is defective.
Table 4-2. FET Multiplexer Visual Tests/Checks
Test/Check Reference
Designator
Check Action/Notes
Heat Damage - - - - -
- - - - -
- - - - -
Discolored PC boards
Damaged insulation
Evidence of arcing
If there is damage, do not
operate the module until you
have corrected the problem.
Switch/Jumper
Settings
SP2
SP1
SP3
J4
JM1
IRQ Level setting
Logical address setting
Card ID
Strain Excitation
Remote Ground Sense
Factory set at 1
Factory set at 112
Factory set 00
Factory set to OFF
Factory Installed
Component
Assembly
F1, F2
J1, J2, J3
P1
Fuse continuity
Dirty or bent connector pins
Dirty or bent connector pins
Check fuses with ohmmeter
Straighten/clean pins
Straighten/clean pins
Testing the Module You can use the tests and checks in Chapter 2 — Verification Tests to
identify a problem with the assembly. See Chapter 3 — Replaceable Parts
for locations of mechanical parts.
Service 4-7