Tektronix T922 User Manual

T921 AND T922
T922R
To replace
the
cover,
line up the slots
on
the coverwith
the front panel and the rear subpanel and slide together .
Replace screws .
SERVICE INFORMATION
The following information is provided to help you keep your T921/T922/T922R in good operating condition . We
recommend that servicing be done by qualified service personnel
only .
You can,
if
you
like, sendyour instrument
to a
Tektronix Service Center
for
re-adjustment
and repair . Contact your local Tektronix representative for information about
the Service Centers in your area .
CABINET REMOVAL
WARNING
Dangerous potentials
exist
at several
points
throughout the T921, T922, and T922R . When
operating the instrument with the covers off, avoid
touching connections and components . Some tran-
sistors have elevated cases . Disconnect the power
before cleaning the
instrument or replacing parts .
To remove the cover, take out the six screws (top and
bottom) holding the two halves together . Pull the two
halves apart .
The T922R cabinet is made of two pieces which can be
removed independently . Each half is held on by six captive
screws . To remove a cabinet half, turn the six captive
screws 90 degrees counterclockwise and lift that half of
the cabinet away from the instrument .
Use a large coin to
loosen the captive screws .
Cleaning
REV . B JUL 1977
PREVENTIVE MAINTENANCE
Preventive maintenance consists of cleaning the instru-
ment regularly and inspecting it occasionally
for
broken or
damaged parts . Regular maintenance
will improve the
reliability
of your instrument and prevent
breakdowns .
Accumulations
of
dirt and dust
on
components act as
an insulating blanket preventing efficient heat dissipation .
Dust on circuit boards and wires can cause arcing and
~~ short circuits, resulting in damage to components or even
instrument failure
. Clean your instrument before this
happens!
Switch Contacts
Section 5-T921/T922/T922R
The cabinet provides protection from dust and dirt and
should be in place during normal operation of the
instrument .
Avoid the use of chemical cleaning agents con-
taining benzene, toluene, xylene, acetone or
similar
solvents . These chemicals may
damage
the plastics
used
in this instrument . Recommended cleaning
agents are isopropyl alcohol or Kelite (1 part Kelite,
20 parts water) .
Exterior . Dust the cabinet with a soft cloth . Dust the
front panel controls with a small soft paint brush . Dirt
clinging to the surface of the cabinet may be removed with
a soft cloth dampened with a mild detergent and water
solution . Avoid using abrasive cleaners . They will scratch
the cabinet and front panel .
Interior . Dust in the interior of the instruments should
be removed before it builds up enough to cause arcing and
short circuits during periods of high humidity . Dust is best
removed from the interior by dry, (approximately 9 Ib/in . Z )
low-pressure air . Dirt clinging to surfaces may be removed
with
a soft
paint
brush or cloth dampened with a mild
detergent and water
solution . Use a
cotton-tipped
applicator for cleaning in narrow spaces and on the circuit
boards .
Do notuse acetone, MEK, MIBK, benzene, toluene,
carbon tetrachloride, trichloroethylene, methyl
alcohol, methylene chloride, sulphuric acid, or
Freon
TC,
TE, TF, TA, 12, 22, to clean the switch
contacts . Damage
may
result . Check the contents of
spray coolants and cleaners before using .
Most of the
switches are cam-actuated assemblies
which do not require frequent maintenance . When
maintenance is necessary due to accumulated dirt and
dust on the contacts, observe the following precautions :
Clean the
switch contacts with isopropyl alcohol or a

Tektronix T922 Specifications

General

Brand	Tektronix
Model	T922
Category	Test Equipment
Language	English