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Maintenance
6–2
SPG 422 Service Manual (B034000 and above)
Service Setups
There is one setup procedure that should only be performed by qualified service
personnel, because it requires removal of the instrument top cover. This sets the
operation of the rear-panel Remote connector.
Configuring the Remote
The instrument is factory-set for RS-232 operation. The remote cable should be
connected to J6, labeled RS-232, on the Digital board. See the Reference section
of this manual for the RS-232 commands.
To set the SPG 422 Remote for ground-closure operation, place the remote cable
on J9, labeled Parallel on the Digital board. See the Reference section of this
manual for how to use the ground-closure commands.
Inspection and Cleaning
Preventive Maintenance consists of cleaning, lubricating, visual inspection,
checking performance, and readjusting the SPG 422 on a regular schedule. The
inspection and cleaning schedule should be established based on the amount of
use and the surrounding environment of the SPG 422. Under average conditions,
a preventive maintenance check should be performed at least once a year (severe
environment conditions such as high heat, high humidity, or dust may dictate a
shorter time interval).
The instrument should be cleaned often enough to prevent dust or dirt from
accumulating. Dust accumulating in the instrument acts as an insulating blanket,
preventing proper cooling, and possibly causing overheating and component
breakdown. Under high humidity conditions, accumulated dust can also provide
an electrical conduction path.
CAUTION.
Avoid the use of chemical cleaning agents that might damage the
plastics used in the instrument. Avoid using organic cleaning solutions such as
benzene, toluene, xylene, acetone, Freon, or other halogenated hydrocarbon
solvents. Use a non-residue type of cleaner, preferably isopropyl alcohol.
Exterior. Remove accumulated dust with a soft cloth or small paint brush. The
brush is particularly useful around the connectors and front-panel buttons.
Remove hardened dirt with a soft cloth, dampened in a mild detergent and water
solution. Do not use abrasive cleaners.
RS-232 Operation
Ground-Closure Operation
Cleaning
Summary of Contents for SPG 422
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