VersaPulse Select Service Manual
0621-499-01 01/94
GENERAL INFORMATION
1-1
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1.0 GENERAL INFORMATION
1.1 USE OF THIS MANUAL
This manual contains service instructions for the Coherent VersaPulse Select series of Holmium:YAG surgical
lasers. The content of this manual is intended solely for use by Coherent Medical Group Field Service Engineers
and Coherent trained and certified customer technicians. Coherent, Inc. can not be responsible for service or
repairs attempted by uncertified persons, and the use of this manual by such persons is prohibited.
This manual is to be in conjunction with the Coherent Operator Manual for the VersaPulse Select. The operator
manual contains important information regarding instrument description, location of controls, specifications,
and normal operating procedures.
As necessary, Coherent Medical Group Service Technical Support releases Field Service Bulletins for the
Versapulse Select series. These bulletins supplement the information in this manual. As they are released, the
bulletins become a part of this manual (Section 7).
1.2 CONVENTIONS USED IN THIS MANUAL
Within the text, logic signals that are active low ("notted") will appear inside of slash marks, as illustrated below.
/BRHOK/
These signals are "active", or true, when the logic level is low. When the logic signal /BRHOK/ is low, the BRH
loop is "OK" (complete). When the logic signal /BRHOK/ is high, the BRH loop is not OK (open).
In most of the schematic diagrams such signals are indicated by the more usual solid line above the signal name,
as illustrated below.
The schematics in this manual do not include individual numbers for the logic elements or operational amplifiers
within a single component. For example, U1 below contains two operational amplifiers. The top op amp would
be referred to as U1-1 ( its output is pin 1), and the other would be referred to as U1-7.
BRHOK
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