Manual 909 7BI1Bus Interface
7BI1
Bus Interface
Copyright © 2018 QEI
4
Maintenance
4.1 Maintenance Philosophy
The 7BI1 Bus Interface is a high-speed digital panel that can be serviced by using standard
equipment and techniques. Equipment such as digital multimeters and oscilloscopes can be
used to measure voltages and check pulse waveforms.
4.2 Preventive Maintenance
Routine maintenance of solid-state equipment is not recommended because of the high
reliability of its components. Failure of such components (when it does occur) is sudden,
rather than gradual and unnecessary handling can only encourage failures.
4.3 Corrective Maintenance
Before attempting corrective maintenance, remember that QEI will service its equipment
under the terms stated in Standard Terms and Conditions when the equipment was
purchased. Only skilled, qualified technicians with extensive experience servicing comparable
equipment should perform corrective maintenance.
CAUTION
DO NOT DISCONNECT OR CONNECT THE 7BI1 CARD WITH POWER ON. TRANSIENT
VOLTAGES GENERATED DURING SUCH PROCEDURES CAN PERMANENTLY DAMAGE
COMPONENTS. ALWAYS BE AWARE OF WHAT EFFECT YOUR ACTIONS CAN HAVE ON
EXTERNALLY CONTROLLED EQUIPMENT.
4.4 Troubleshooting
Troubleshooting the QUICS panels in the field is not recommended unless a trained staff of
service personnel with a fully equipped shop containing test equipment, oscilloscopes, etc.
would be available to isolate a faulty component. QEI will service its equipment at a nominal
fee, or without cost while the equipment is under warranty. When field servicing is attempted,
the technician should be thoroughly familiar with the theory of operation and the circuit panel
schematics. QEI does offer maintenance training courses so that field maintenance can be
conducted efficiently.
When checks are made on the cards, all inputs should be tested first. With the aid of the
schematic, the technician should start at the outputs of the card and work backwards into the
circuitry until the faulty component is isolated.
Most micromodules on the printed circuit cards are soldered in place. Special printed-circuit
repair techniques are required for their removal. Excessive heat may seriously damage the
circuitry.
Damage caused by improper soldering can void your warranty
! Standard
components, such as capacitors and diodes, are best replaced by clipping off the faulty
component close to the body and soldering the replacement to the leads of the original
component.
4.5 7BI1 Replacement
For minimum subsystem down time, suspected 7BI1 cards should be replaced and either
repaired off line or returned to QEI for repairs.
4.5.1 Ordering Spare or Replacement Subassemblies
Spare or replacement subassemblies may be ordered from QEI. The part number is
40-057026-001.
