Avoiding Problems
4-18 72A-1230 Rev. F
July 22, 2005
39 Phase Lock Loop
Not Locked
1. If a portable generator is being used to
power the M4000, stabilize its output
frequency by adding a load, such as a
space heater, to load the generator.
2. If the symptom occurs in line sync mode
only, replace the Amplifier Assembly. If
it occurs in both state modes, reseat the
W8 cable connectors between the Guard
Board and Guard Mode Switch Board
(see Figure 4.26 on page 4-53). Replace
the Guard Board and Guard Mode
Switch Board, one at a time, if reseating
the cable connectors does not help.
41 Strobe Not
Flashing
Replace the strobe lamp. If the fixture needs
replacing, temporarily operate the
instrument without a strobe:
1. Select Instrument from the
Tools/Configuration menu in the
M4000 software.
2. Disable the strobe requirement.
50 Lead Changed
During Test
1. Clean all cable terminations.
2. If the problem persists, replace the
Guard Front Panel Board (see
”Replacing the Guard Front Panel
Board” on page 4-61).
51 Safety Switches
Not Released
Between Tests
This is intended as a safety feature. When a
test or a “multiple test” has been run, the
safety switches must be released before
starting the next test or “multiple test”. Do
not press the safety switches until the final
pre-test warning screen is displayed.
Otherwise the next test cannot be run.
Table 4.5 Error Messages (Continued)
# Error Message Suggested Action
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