HP 5501B, Руководство по эксплуатации и обслуживанию, Страница: 61 / 120

HP5501B
Service
8-1
8 SERVICE
8-1. Introduction
8-2. This section contains service information for the HP5501B Laser Head. Also included are safety
considerations, theory of operation, block diagrams, schematic diagrams, component locators,
and troubleshooting and repair procedures. Other useful service information also provided in
other sections of this manual include: performance tests in
Section 4 , adjustments in Section 5 ,
and exploded view illustrations and parts lists in Section 6 .
8-3. Theory of Operation
8-4. The theory of operation is presented at two levels:
• Block Diagram Description. These paragraphs describe the laser head's major functional
blocks and modes of operation. The description references the HP5501B Laser Head Block
Diagram, Figure 8-2.
• Board Level Theory of Operation. These paragraphs are arranged by assembly number
order and describe the circuitry at the component level. The descriptions are used with
schematic diagrams for A1, A2, and A3.
8-5. Recommended Test Equipment
8-6. Table 1-2 in Section 1 lists the test equipment required for service. Any equipment that satisfies
the critical specifications given in the table may be substituted for the recommended model (s).
8-7. Service Aids
8-8. This system uses both Metric and English hardware. Figure 6-1 should be used to determine the
correct hardware descriptions, part numbers and the proper tools to employ for assembly and
disassembly.
8-9. Schematic Diagram Symbols and Reference Designations
8-10. The logic symbology used on the schematic diagrams conforms to American National Standard
(ANSI/IEEE Std. 91-1984). This standard supersedes MIL-STD-806B.
8-11. Figure 8-1 shows some of the symbols used on the schematic diagrams. In the center of this
figure, the scheme for printed circuit board identification is presented. Also shown at the bottom
of Figure 8-1 is the method used to identify reference designators, assemblies, and
subassemblies.
NOTE
A TILDE ("~") PRECEDING A SIGNAL NAME (I.E., ~REF ON) INDICATES
NEGATIVE-TRUE LOGIC.