Table 2-3 Troubleshooting - Cal Power TrueWave TW5250 Service Manual

MAINTENANCE AND TROUBLESHOOTING
Fault Symptom
With unit turned on, front panel
display and fans remain de-
energized.
With unit turned on, front panel
display comes on, but fans remain
de-energized.
Unit comes up momentarily and
shuts off immediately.
Loss of GPIB communication,
unable to communicate with SW
system via GPIB (IEEE 488.2)
connector.
No -or- incorrect output voltage
when unit is programmed correctly
and output relay is closed.
Unit comes up and displays SELF
TEST FAILURE
2-4
TABLE 2-3. TROUBLESHOOTING
• Check for proper input voltage to TW unit.
Correct the input voltage as necessary.
• De-energized unit, check and replace input
fuses as necessary. Re-energize unit and
test. If fuses open a second time, de-
energize unit and perform disassembly
steps 2.6.1 thru 2.6.12, replacing the power
modules of the phases with the open fuses.
(Note: phase A power module located
nearest to fuse block and phase B in
center). Re-assemble unit and test.
• De-energize unit and perform disassembly
step 2.6.1. Insure that fan panel cable
5161563-01
energize unit and test.
• De-energize unit and perform disassembly
steps 2.6.1 thru 2.6.5. Insure that the
connectors
properly seated. Re-assemble unit and test.
• Probable cause is ribbon cable/connector
damage. De-energize unit and perform
disassembly
replacing rear panel assembly. Special care
must be taken not to damage ribbon cables
during installation in passageway on side of
chassis. Re-assemble unit and test.
• De-energize unit and perform disassembly
steps 2.6.1 thru 2.6.7.
5161524-01 for seating problems.
• Hit ENTER key. Go into the menu under
CONFIG and verify that the INSTALLED
number reflects the actual quantity of
modules installed.
Troubleshooting / Corrective Action
is properly
of cable
steps
TW SERIES
installed. Re-
5161524-01 are
2.6.1 thru 2.6.20
Inspect cable