Hfa Ii - I Service Strategy; Two-Level Service Strategy; Three Steps To Completing An Hfa Ii - I Service Call - Zeiss humphrey HFA II-i series Field Service Manual

Humphrey Field Analyzer II - i
1.3

HFA II - i Service Strategy

1.3.1

Two-Level Service Strategy

A two-level service strategy is used for the HFA II - i: Level 1 for on-site service; and Level 2
for Repair Center service. Level 1 service employs modular replacement, wherein faulty
circuit boards and certain other assemblies are replaced rather than repaired on-site. These
faulty assemblies are shipped to a Carl Zeiss Meditec Repair Center for repairs. There are
also certain procedures that require special equipment available only at a Repair Center.
Designated Repair Centers (currently Dublin, CA and Jena, Germany) are the second level
of service for the HFA II - i. The Repair Centers perform major circuit board troubleshooting
and repair, plus any other service action that requires special equipment or procedures not
available in the field.
Several of the circuit boards in the HFA II - i are multilayer boards and use Surface Mount
Technology (SMT) components. These boards require special equipment and techniques for
troubleshooting and repair.
All service procedures (including instrument calibration) can be performed in the field, except
for those listed below. For Carl Zeiss Meditec U.S. Domestic operations, the following
procedures must be performed at the Carl Zeiss Meditec Repair Center.
Circuit board troubleshooting and component replacement
P
Repair of floppy, tape, and hard drives.
P
Alignment of projection carriage rails and first projection mirror (top turret mirror)
P
Repair of power supply assembly
P
Repair of camera assembly
P
1.3.2

Three Steps to Completing an HFA II - i Service Call

The basic approach to an HFA II - i service call is outlined below. This typical process
includes collection of general instrument calibration data and light intensity data both Before
service and again After service. The process is described in detail in Section 4.8.1. For
guidelines, refer to HFA II - i Field Service Paperwork Requirements (Section 1.3.3).
1.
Obtain the Before Light Intensity instrument data (4.8.1).
This step assumes that the HFA II - i is operable; that is, it will power up to the
Main Menu without error. This data gives the service representative a base from
which to evaluate the light intensity operation of the instrument, and a point of
comparison if recalibration is required.
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General Information
Field Service Guide