SECTION IV
MAINTENANCE
SAFETY
Observe the following safety precautions
when performing maintenance procedures
on the 50/750:
1. Hazardous voltages exist within the
instrument enclosure. Always turn off
the 50/750 and disconnect it from its
power source before cleaning or
inspecting it. Failure to observe this
precaution could result in an electrical
shock.
2. Allow a cool-down period to reduce the
danger of burns from heated parts such
as transistors and heat sinks.
3. Refer all maintenance procedures to
qualified personnel.
PREVENTATIVE MAINTENANCE
Preventative maintenance consists of
inspecting and cleaning the instrument.
Preventative maintenance performed on a
regular basis may prevent instrument failure
and improve reliability.
ACCESS: Remove the top cover to expose
all assemblies for inspection and cleaning.
INSPECTION: Visually inspect the instru-
ment for loose or damaged components or
other undesirable conditions such as heat-
damaged parts.
CLEANING: Clean the 50/750 as operating
conditions require. Dust and dirt on
components act as an insulating blanket and
prevent efficient heat dissipation. This can
cause overheating and component failure.
Dust and direct also provide an electrical
conduction path that can result in instrument
failure, especially under conditions of high
humidity that can cause arcing in the high-
voltage sections.
Use dry, low-pressure compressed air to
blow the accumulated dust and dirt from the
interior of the instrument. Use a brush to
dislodge dirt and dust that is not readily
dislodged by the compressed air.
Clean the exterior of the instrument with an
equal part solution of denatured alcohol and
water. The use of stronger solvents may
damage the finish or plastic components. A
small brush is effective in removing dirt from
the front and rear panel controls and
connectors.
SERVICING THE FUSES
WARNING: Never attempt to service the
fuses when the instrument is plugged into a
power source. An electrical shock could
result. Refer servicing of the fuses to
qualified personnel.
1. Disconnect the 50/750 from its power
source before changing the fuses.
2. Remove and replace the fuses with new
ones of the same style and value.
If the 50/750 continually blows fuses, a more
serious problem may exist within the
instrument. In this instance, contact the
Customer Service Department at Trek, Inc.
and request instructions.
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