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tained from a local commercial source. Before purchasing or
ordering parts from a source other than Tektronix, Inc.,
check the Replaceable Electrical Parts list for the proper
value, rating, tolerance, and description.
Ordering Parts
When ordering replacement parts from Tektronix, Inc., it
is important to include all of the following information.
1. lnstrument type (include modification or option
numbers).
2. lnstrument serial number.
3. A description of the part (if electrical, include the com-
ponent number).
4. Tektronix part number.
Soldering Techniques
I
W A R N I N G
)
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 60140 rosin-core, electronic grade sol-
der. The choice of soldering iron is determined by the repair
to be made.
The Analog board in the DC 501 0 is a multilayer type
board with a conductive path laminated between the
top and bottom board layers. All soldering on this
board should be done with extreme care to prevent
breaking the connections to this conductive path.
Only experienced maintenance personnel should at-
tempt to repair this board. Do not allow solder or sol-
der flux to flow under printed circuit board relays. The
printed circuit board is part of the relay contacts; in-
termittent relay 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-
rate from the board base material and melt the insulation
from small wiring. Always keep the soldering iron tip proper-
ly tinned to ensure the best heat transfer to the solder joint.
Apply only enough heat to remove the component or to
make a good solder joint. To protect heat sensitive compo-
nents, hold the component lead with a pair of long-nose
pliers between the component body and the solder joint.
Use a solder removing wick to remove excess solder from
connections or to clean circuit board pads.
To remove in-line integrated circuits use an extracting
tool. This tool is available from Tektronix, Inc.; order
Tektronix Part Number 003-0619-00. If an extracting tool is
not available, use care to avoid damaging the pins. Pull
slowly and evenly on both ends of the integrated circuit. Try
to avoid disengaging one end before the other end.
Interconnecting Pins
Several methods of interconnection, including square pin,
are used to electrically connect the circuit boards with the
other boards and components.
Several types of mating connectors are used for these
interconnecting pins. The following information provides the
removal and replacement procedure for the various
interconnecting methods.
Square Pin Assemblies
See Fig. 5-3. These pins are of various lengths. They are
attached to each other with a plastic strip. To remove them
simply unsolder from the circuit board.
Fig. 5-3. Typical square pin assembly.
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