7.
SERVICE AND MAINTENANCE
7.1
GENERAL SERVICE
For any faults that cannot be field-repaired as noted below, contact the EAW Service Department
listed in Chapter 7 to determine the appropriate action. This applies to both warranty and non-
warranty faults.
7.2
RIGGING SERVICE
Because of the potential for serious consequences and liabilities due to faulty rigging, contact
EAW to determine the appropriate service solution for any rigging hardware problems.
7.3
BASIC FIELD TROUBLESHOOTING
Each KF740 has an input panel, internal components and wiring, transducers, and an enclosure.
Troubleshooting for various performance problems usually involves isolating the problem to one
of these areas:
1. Transducers
2. Input panel, internal components, and wiring
3. Enclosure and integral hardware
If no problems can be traced to any of these items, look for problems with external electronics or
cabling. Troubleshooting these items is beyond the scope of this manual.
7.3.1
Transducers
A faulty transducer will usually cause readily audible distortions or other unwanted noises. In
other cases, they may stop functioning. Use your ears and test signals or other sound source to
determine which one is at fault. Normally a faulty transducer requires service or replacement by
EAW.
7.3.2
Input panel, Internal Components and Wiring
Faults with these items will usually cause transducers to stop working or possibly be intermittent.
Check that audio signals pass from the input jacks to the transducer terminals. Many faults with
this area can be field-repaired.
7.3.3
Enclosures
Enclosure problems, such as loose hardware, faulty joints, or other structural problems, will
usually be heard as distinct buzzes, rattles, or other unwanted noises. To test for enclosure
problems, use a sine wave signal manually swept on the LF sub-system. The input level should
be no more than 6 dB below rated power (equals no more than 1/2 rated voltage). It may be
possible to field-repair some enclosure problems.
7.4
INSPECTION
7.4.1
In-Use Inspection
Visually inspect all rigging parts and enclosures each time they are used for wear, deformation,
cracks, corrosion, damage, and any other condition that may affect load handling capability.
DANGER: If there is any question about the integrity or capability of any rigging part to perform
its intended function, immediately remove it from service for repair or replacement.
Page 20 of 22 KF740 OWNER’S MANUAL
