Granville-Phillips Micro-Ion 354 E Series, Instruction Manual, Page: 37 / 54

Maintenance
Micro-Ion E Module Instruction Manual 354011, Rev. A
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Table 6-1 Failure Symptoms, Causes, and Solutions
Symptom Possible Causes Solution
Output voltage = 0 V. 24 Vdc power supply cable is
improperly connected or faulty. Repair or replace power supply cable
(see page 13).
Pressure reading is too high. • Conductance in connection to
vacuum chamber is inadequate.
• Plumbing to module leaks or is
contaminated.
• Chamber pressure is too high due to
leak, contamination, or pump
failure.
• Power supply or output cable is
improperly connected or faulty.
• If conductance is inadequate,
reconnect port to a larger
conductance port on the vacuum
chamber, or install larger
conductance plumbing (see
page 12).
• If plumbing leaks or is
contaminated, clean, repair or
replace plumbing.
• If pump failed, repair or replace it.
• If cable is improperly connected or
faulty, repair or replace cable
(see page 13).
Pressure reading is inaccurate. Temperature or mechanical vibration
is extreme. Relocate module or eliminate source
of heat or vibration.
• Indicated pressure is different than
pressure indications from other
measurement devices.
• LED status indicator is solid red.
Micro-Ion E gauge is defective. Replace gauge assembly
(see page 40).
Output voltage is < 0.10 V. A circuit board is faulty. Return module to factory
(see page 40).