Tektronix DM 5010, Instruction Manual

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Maintenance — DM 5010
9. Use a soldering iron that is connected to earth
ground.
refer to the replaceable parts lists and the Cross Reference
Index, Mfr. Code Number to Manufacturer.
10. Use only special anti-static suction type or wick type
desoldering tools.
Table 7-2
RELATIVE SUSCEPTIBILITY TO
TO STATIC DISCHARGE DAMAGE
Relative
Semiconductor Classes
Susceptibility
Levels *
When ordering replacement parts from Tektronix, Inc.,
include the following information:
1. Instrument type (include modification or option
number);
2. instrument serial number;
3. a description of the part (if electrical, include complete
circuit number); and
MOS or CMOS microcircuits or
discretes, or linear microcircuits
with MOS inputs. (Most Sensitive)
1
ECL 2
Schottky signal diodes
3
Schottky TTL
4
High-frequency bipolar transistors !
5
JFETs | 6
Linear microcircuits j 7
Low-power Schottky TTL ; 8
TTL (Least Sensitive) | 9
a
Voltage equivalent for levels:
1 = 100 to 500 V 4 = 500 V 7 = 400 to 1000 V(est.)
2 = 200 to 500 V 5 = 400 to 600 V 8 = 900 V
3 = 250 V 6 = 600 to 800 V 9 = 1200 V
(Voltage discharged from a 100 pF capacitor through a resis
tance of 100 Ω.)
Obtaining Replacement Parts
Electrical and mechanical parts can be obtained through
your local Tektronix Field Office or representative. However,
it may be possible to obtain many of the standard electronic
components from a local commercial source. Before pur­
chasing or ordering a part from a source other than
Tektronix, Inc., check the Replaceable Electrical Parts list
for the proper value, rating, tolerance, and description.
NOTE
When selecting replacement parts, remember that the
physical size and shape of a component may affect its
performance in the instrument.
Some parts are manufactured or selected by Tektronix,
Inc., to satisfy particular requirements or are manufactured
for Tektronix, Inc., to our specifications. Most of the me­
chanical parts used in this instrument have been manufac­
tured by Tektronix, Inc. To determine the manufacturer,
4. Tektronix part number.
Soldering Techniques
WARNING
j
To avoid electric-shock hazard, disconnect the instru­
ment from the power source before soldering.
The reliability and accuracy of
this instrument can be
maintained only if proper soldering techniques are used
when repairing or replacing parts. General soldering tech­
niques, which apply to maintenance of any precision elec­
tronic equipment, should be used when working on this
instrument. Use only 60/40 rosin-core, electronic grade sol­
der. The choice of soldering iron is determined by the repair
to be made.
The CPU, ADC, Front Panel Driver, Front Panel and
Isolation boards are multilayer type boards with a con­
ductive path laminated between the top and bottom
board layers. All soldering on these boards should be
done with extreme care to prevent breaking the con­
nections to this conductive path.
Do not allow solder or solder flux to flow under printed
circuit board switches. The printed circuit board is part
of the switch contacts; intermittent switch operation
can occur if the contacts are contaminated.
When soldering on circuit boards or small wiring, use
only a 15 watt, pencil-type soldering iron. A higher wattage
soldering iron can cause the etched circuit wiring to sepa­
7-6