ConMed sabre 180, Руководство по обслуживанию

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5.1 GENERAL
This section contains detailed information on all
of the Sabre 180 circuitry. Foldout sheets allow
schematic diagrams to be viewed while reading
related text in Section 3 Theory of Operation and
Section 4 Troubleshooting. Appearing with each
schematic are printed wiring board (PWB) lay-
outs, to aid in locating components, and lists of
replaceable parts in reference designator order.
Reference designators are numbered starting with
“_1” in each assembly; they may be identified
globally by adding an “A_” assembly prefix.
The HLP Code list, along with a description of
the tests which produce them and possible causes,
appears as Appendix A at the end of this Section.
5.2 ASSEMBLY STRUCTURE AND PARTS
ACCESS
Referring to Figure 5.2, the Sabre 180 is divided
into two major halves, the Base Assembly, A6,
and the Top Cover Assembly, A8. When the Top
Cover is opened, access is gained to the A4 Power
PWB, A5 Output Panel and all A6 chassis-
mounted components.
The Top Cover A8 mounts the A3 Controller and
its A8VR1 and A8Q1, which use the Top Cover
as a heatsink. The Display PWB A2 is secured to
the Control Panel A1 which is mounted to the
Top Cover using nuts, studs and an adhesive gas-
ket. Access to these assemblies is gained by
removal of the Shield. The Top Cover is electri-
cally bonded to the Base assembly with two
braided ground straps.
With the Top Cover open and the Shield
removed, test probe access is gained to every
component terminal in the unit. In this state, the
unit remains fully functional. If it is necessary to
close the top cover, the Shield should be rein-
stalled with at least one nut each at the top and
bottom to prevent interference during high-
power activation from disrupting the display
processor and causing a HLP 12 shutdown.
Refer to Section 1.1.4 for Precautions When
Testing or Servicing.
CAUTION: Turn off power and/or disconnect
the power cord before removing any assem-
blies, connectors or components. Before
applying power, remove any foreign objects
which may have accidentally been dropped in
the unit.
CAUTION: Hazardous voltages appear in the
unit when it is connected to the AC mains.
When activated, high voltage, high frequency
power is present on the A5 Output Panel and
on the A4 PWB in the area marked with light-
ning bolts.
CAUTION: Replace fuses only with the type
and rating marked adjacent to the fuse clips or
holders.
5.2.1 Top Cover
Refer to Figure 5.1 to locate the two Phillips
head screws which secure the Top Cover. After
these screws are removed, slide the top cover for-
ward until it stops, then lift the front of the top
cover, rotating it around its rear edge until verti-
cal. The Top Cover may then be supported in the
open position by sliding the slots in the Top
Cover brackets on to the top edge of the rear
panel. If necessary, the Top Cover may be opened
while the unit is operating, provided care is taken
to avoid dropping foreign objects into the circuit-
ry.
Reverse this process to close the unit. Switch
A3S1 to RUN before returning the unit to ser-
vice. Avoid stressing the Top Cover ground straps
when lifting the Top Cover off the rear panel.
After the Top Cover is horizontal on the Base
Assembly, slide it forward until the two front
studs align with their mating slots in the Base
Assembly, then push it rearward fully. Align the
captive nuts in the Top Cover brackets with the
screw holes in the rear panel, then start both
screws loosely before tightening.
Technical Data
Section 5.0
5-1