Models 947, 948 and 960 Leak Detectors Operations and Service Manual
5-3
5.2 Troubleshooting Symptoms and Solutions
Table 5-2 lists the particular symptoms encountered when troubleshooting the leak detector.
For every symptom, there is a list of possible causes and actions you can take to remedy the
situation.
Table 5-2
Troubleshooting
Symptom
Check For
Corrective Action
Leak Detector fails to
transfer to the TEST mode
Leak at an inlet line in the
vacuum system.
Fix leak.
Forepump oil discolored or
froth on top of oil.
Check for leak, fix, then change the oil. Refer
to pump manual if conditions occur again.
Forepump oil discolored or
froth on top of oil and a
reading of 100 mTorr on the
Test Port Pressure gauge.
Dirty oil. Change oil. Refer to pump manual.
Check for leak, fix, then change the oil and
flush the Rough pump or Forepump.
Dirty TC gauge. Detector won’t read correctly,
high test port pressure reading. Clean TC
gauge. If problem persists, replace TC gauge.
Models 948/960 only:
Excessive moisture in the
cold trap
Dry out the cold trap. A warm-up period is
necessary.
Electrical Components: No
power, no lights on panel
ON/OFF switch of the rear
panel is not ON.
Verify that the switch is ON.
Power cable is disconnected.
Verify that the power cable is plugged in.
Source power receptacle is
bad.
Route to a new receptacle or fix the old one.
Circuit breaker is tripped.
Reset the breaker and check for the initial
problem.
Fans and Heater: not
operational
Circuit breaker is tripped.
Reset the breaker and check for initial problem.
Fan cord is not properly
connected.
Plug in. Verify that the cord is not frayed or
loose.
Heater cord is not properly
connected.
Plug in. Verify that the cord is not frayed or
loose.
Mechanical Components:
Pumps not running
Power cord is disconnected.
Check pump power cords and that 947/948/
960 power cord is plugged into outlet.
947/948/960 in STANDBY.
Take out of STANDBY. Rough pump will not run
in STANDBY.
Summary of Contents for 948
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