Maintenance
4- 4
Tektronix 4000 Series Digital Phosphor Oscilloscopes Service Manual
To access the inside of the oscilloscope for inspection and cleaning, refer to the
Removal Procedures
in this section.
Inspect the internal portions of theoscilloscope for damage and wear, using Table
4--2 as a guide. Repair any defects immediately.
If any circuit board is repaired or replaced, check Table 4--2 to see if it is
necessary to adjust the oscilloscope.
CAUTION.
To prevent damage from electrical arcing, ensure that circuit boards
and components are dry before applying power to the oscilloscope.
Table 4- 2: Internal inspection check list
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, blis-
tered condition.
Remove and replace damaged
circuit board.
Solder connections
Cold solder or rosin joints.
Resolder joint and clean with
isopropyl alcohol.
Capacitors
Damaged or leaking cases.
Corroded solder on leads or
terminals.
Remove and replace damaged
circuit board.
Wiring and cables
Loose plugs or connectors.
Burned, broken, or frayed wiring.
Firmly seat connectors. Repair or
replace modules with defective
wires or cables.
Chassis
Dents, deformations, and dam-
aged hardware.
Straighten, repair, or replace
defective hardware.
Interior Inspection
Summary of Contents for 4000 Series
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