Maintenance-2225 Service
If any electrical component is replaced, conduct a
Performance Check for the affected circuit and for
other closely related circuits (see Section
4).
If
repair or replacement work is done on any of the
power supplies, conduct a complete Performance
Check and, if so indicated, an instrument readjust-
ment (see Sections
4
and
5).
To prevent damage from electrical arcing,
ensure that circuit boards and components
are dry before applying power to the
instrument
.
CLEANING.
To clean the interior, blow off dust with
dry, low-pressure air (approximately
9
psi). Remove
any remaining dust with a soft brush or a cloth
dampened with a solution of mild detergent and
water. A cotton-tipped applicator is useful for clean-
ing in narrow spaces and on circuit boards.
VOLTlDlV And SEClDlV SWITCHES.
These are
maintenance free.
DO
NOT CLEAN.
Most spray-type circuit coolants contain
Freon
12
as a propellant. Because many
Freons adversely affect switch contacts, do
not use spray-type coolants on the switches
or attenuators. Carbon based solvents will
damage the board material.
LUBRICATION
Most of the potentiometers used in this instrument
are permanently sealed and generally do not require
periodic lubrication. All switches, both rotary- and
lever-type, are installed with proper lubrication
applied where necessary and will rarely require any
additional lubrication. A regular periodic lubrication
program for the instrument is, therefore, not
recommended.
SElVllCONDUCTOR CHECKS
Periodic checks of the transistors and other semi-
conductors in the oscilloscope are not recom-
mended.
'The best check of semiconductor
performance is actual operation in the instrument.
PERIODIC READJUSTMENT
To ensure accurate measurements, check the per-
formance of this instrument every
2000
hours of
operation, or if used infrequently, once each year. In
addition, replacement of components may
necessitate readjustment of the affected circuits.
Complete Performance Check and Adjustment in-
structions are given in Sections
4
and
5.
The Per-
formance Check Procedure can also be helpful in
localizing certain troubles in the instrument. In some
cases, minor problems may be revealed or
corrected by readjustment. If only a partial
adjustment is performed, see the interaction chart,
Table
5-1,
for possible adjustment interaction with
other circuits.
TROUBLESHOOTING
INTRODUCTION TROLIBLESHOOTING AIDS
Schematic
Diagrams
Preventive maintenance performed on a regular
basis should reveal most potential problems before
an instrument malfunctions. However, should
troubleshooting be required, the following infor-
mation is provided to facilitate location of a fault. In
addition, the material presented in the Theory of
Operation and Diagrams sections of this manual may
be helpful while troubleshooting.
Complete schematic diagrams are located on
tabbed foldout pages in the Diagrams section.
Portions of circuitry mounted on each circuit board
are enclosed by heavy black lines. The assembly
number and name of the circuit are shown near
either the top
or
the bottom edge of the enclosed
area.
Scans
by
ARTEK
MEDLA
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