General Service Information; Cmos Handling Precautions; Foreword - Welch Allyn Grason-Stadler GSI 17 Series Service Manual

GENERAL SERVICE INFORMATION

Operating, check-out procedures,
can be found in the Instruction Manual (1717-0100).
and/or bench testing of GSI 17 Audiometers should only be
performed by trained personnel.
provided primarily for use by persons who are skilled in the
repair of electronic equipment.

CMOS HANDLING PRECAUTIONS

Many of the integrated circuits on the P.C. boards are CMOS and
NMOS type.
Failure to observe the following precautions whenever a circuit
board or an integrated-circuit package is handled can result in
damage to the GSI 17.
Place instrument and parts on a grounded, conductive work
a.
surface.
b. Ground yourself (with a strap having about 1 M ohm
resistance).
C . Ground the frame of any test instrument or soldering iron to
be used.
If any circuit boards are to be stored or transported,
d.
enclose them in conductive (anti-static) envelopes.
F O R E W O R D
trouble-shooting hints, etc.,
The following instructions are
CAUTION
ix
Repair