Service manual

Making Visual
Checks
Visual checks for the multiplexer assemblies include the following.
See Table 4-3 for typical symptoms/actions.
• Check switches/jumpers
• Check for heat damage
• Check terminal module connections
NOTE Refer to the appropriate 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 a relay
or other component is defective.
Table 4-3. E1343A/44A/45A/47A/55A/56A 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
multiplexer until you have corrected the
problem.
Switch/Jumper
Settings
- - - - -
SW1
SW2
IRQ Level setting
Logical address setting
Card ID setting
Factory set at 1
Factory set at 112
Set to 45A,47A,55A, or 56A as
appropriate for multiplexer
Component
Assembly
F1, F2
J1
P1
Fuse continuity
Dirty or bent connector pins
Dirty or bent connector pins
Check fuses with ohmmeter
Straighten/clean pins
Straighten/clean pins
Terminal
Module
P1
TB1 - TB5
J0, J1
(E1355A/56A)
Dirty or bent connector pins
Loose screw connections
Bridge connections
Straighten/clean pins
Check/tighten connections
Set for 1/4, 1/2, or full as required
Chapter 4 Service 57