CAUTION: T
o prevent damage from electrical arcing, ensure that circuit boards and components are dry before applying power to
the instrument.
Table 2: Internal inspection checklist
Item Inspect for Repair action
Circuit boards Loose, broken, or corroded solder
connections. Burned circuit boards. Burned,
broken, or cracked circuit-run plating.
Remove and replace damaged circuit board.
Resistors Burned, cracked, broken, blistered condition.
Capacitors Damaged or leaking cases. Corroded solder
on leads or terminals.
Wiring and cables Loose plugs or connectors. Burned, broken,
or frayed wiring.
Firmly seat connectors. Replace defective
cables.
Chassis Dents, deformations, and damaged
hardware.
Straighten, repair, or replace defective
hardware.
Lubrication
There is no periodic lubrication required for this instrument.
Returning the instrument for service
When repacking the instrument for shipment, use the original packaging. If the packaging is unavailable or unfit for use, contact your local
T
ektronix representative to obtain new packaging.
Seal the shipping carton with an industrial stapler or strapping tape.
Before returning the instrument for service, contact the Service Center to get an RMA (return material authorization) number, and any
return or shipping information you may need.
If the instrument is being shipped to a Tektronix Service Center, enclose the following information:
• The RMA number.
• The owner's address.
• Name and phone number of a contact person.
• Type and serial number of the instrument.
• Reason for returning.
• A complete description of the required service.
Mark the address of the Tektronix Service Center and the return address on the shipping carton in two prominent locations.
Removal and replacement procedures
This section contains procedures for removal and installation of replaceable modules in the instrument. Refer to Replaceable parts for lists
and exploded views of replaceable modules.
Any module inside of the chassis that does not have a remove and replace procedure requires that the entire instrument be returned to
Tektronix Service Center for service.
Warning: Before performing this or any other procedure in this manual, read the safety summaries found at the beginning of
this manual. Also, to prevent possible injury to service personnel or damage to the instrument components, read Preventing
ESD on page 15.
Before performing any procedure in this subsection, disconnect the power cord from the line voltage source. Failure to do so could
cause serious injury or death.
Maintenance
4 Series MSO (MSO44, MSO46) Service 17
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