Tektronix DPO4034B, Service Manual

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Maintenance
Clean the power switch using a dampened cleaning towel. Do not spray or wet
the switch directly.
CAUTION.
Avoid the use of chemical cleaning agents, which might damage the
plastics used in this oscilloscope. Use only deionized water when cleaning the
menu buttons or front-panel buttons. Use a 75% isopropyl alcohol solution as a
cleaner and rinse with deionized water. Before using any other type of cleaner,
consult your Tektronix Service Center or representative.
Exterior Inspection
Inspect the outside of the oscilloscope for damage, wear, and missing parts,
using the following table as a guide. Immediately repair defects that could cause
personal injury or lead to further damage to the oscilloscope.
Table 1: External inspection checklist
Item Inspect for Repair action
Cabinet, front panel, and cover Cracks, scratches, deformations, damaged
hardware. Repair or replace defective module.
Front-panel knobs Missing, damaged, or loose knobs. Repair or replace missing or defective
knobs.
Connectors Broken shells, cracked insulation, and
deformed contacts. Dirt in connectors. Repair or replace defective modules. Clear
or wash out dirt.
Carrying handle, and cabinet feet Correct operation. Repair or replace defective module.
Accessories Missing items or parts of items, bent pins,
broken or frayed cables, and damaged
connectors. Repair or replace damaged or missing
items, frayed cables, and defective modules.
Interior Inspection
To access the inside of the oscilloscope for cleaning and inspection, refer to the
exploded view diagrams. (See page 31,
Replaceable Parts List .)
Inspect the internal portions of the oscilloscope for damage and wear, using the
following table as a guide. Repair any defects immediately.
If any circuit board is repaired or replaced, you must perform the Adjustments
Procedure. (See page 7,
Adjustment Procedure .).
CAUTION.
To prevent damage from electrical arcing, make sure that circuit
boards and components are dry before applying power to the oscilloscope.
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.
MSO4000B and DPO4000B Series Digital Phosphor Oscilloscopes Service Manual 21