ABL77 Service Manual
Chapter 1: Introduction
Service Policy,
Continued
Repair level
The repair level outlines the extent to which it is allowed to dismantle an analyzer
in the process of troubleshooting and repair. This level is limited for several
reasons such as: the need for specialized test equipment, special environmental
requirements etc., and is optimized in relation to cost of parts, time for repair, etc.
The repair level is indicated in the chapters
(5) Dismantling
,
(7) Re-Assembly
and
(9) Spare Parts
.
Electronics Module
The major components in the electronics module are printed circuit boards. Low-
level repair of these boards is not allowed in the field. Most of the boards are based
on surface mounted technology, which involves a high component density and
thereby a high complexity. Repair of this type of printed circuit board (PCB)
requires advanced troubleshooting, repair and test facilities, which are only
available at the factory. Some PCBs may be returned to the factory for replacement
under the trade-in agreement for modules. These PCBs are marked with “*” next to
the description in the spare parts list. Since repair is not allowed in the field,
detailed circuit diagrams are not included in the service manual.
Lower Module
Most of the electromechanical and pure mechanical parts of the lower module may
be repaired to the component level. Tubing, the printer, and pump motors are
regarded as components (or component assemblies). The various programs
facilitate checkout and adjustment of these parts and also verification of their
function after repair.
Some mechanical adjustments are critical for their function. Such parts are not to
be dismantled further than indicated in the spare parts list.
Upper Module
The upper module may be repaired to the component level. The various programs
facilitate checkout and adjustment of these parts and also verification of their
function after repair.
Some mechanical adjustments are critical for their function. Such parts are not to
be dismantled further than indicated in the spare parts list.
Continued on next page
Rev. F
1-3
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