Tektronix 7B92 Instruction Manual page 18

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b. Circuit Board Pins and Pin Sockets.
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) CAUTION
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~~,
The fol/owing procedures are recommended for
single-layer circuit boards only. Pin and socket
replacement on multi-layer circuit boards should be
performed only by specialized service personnel.
Refer to your local Tektronix Field Office or Service
Center.
A circuit board pin replacement kit including neces-
sary tools, instructions, and replacement pins is available
from Tektronix, I nco (Tektronix Part No. 040-0542-00).
To replace a pin which is mounted on a circuit board,
first disconnect any pin connectors. Then, unsolder the
damaged pin and pull it out of the circuit board with a
pair of pliers. Be careful not to damage the wiring on the
board with too much heat.
Ream out the hole in the circuit board with a
0.031-inch drill. Remove the ferrule from the new
interconnecting pin and press the new pin into the hole
in the circuit board. Position the pin in the same manner
as the old pin. Then, solder the pin on both sides of the
circuit board. If the old pin was bent at an angle to mate
with a connector, bend the new pin to match the
associated pins.
The pin sockets on the circuit boards are soldered to
the rear of the board. To replace one of these sockets,
first unsolder the pin socket (use a vacuum-type desol-
dering tool to remove the excess solder). Then straighten
the tabs on the socket and remove it from the hole in
the board. Place the socket in the circuit board hole and
press the tabs down against the board. Solder the tabs of
the socket to the circuit board; be careful not to get
solder into the socket.
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Maintenance-7B92 Service
NOTE
The spring tension of the pin sockets ensures a good
connection between the circuit board and the pin.
This spring tension can be destroyed by using the pin
sockets as a connecting point for spring-loaded probe
tips, alligator clips, etc.
c. End-Lead Pin Connectors.
The pin connectors used to connect the wires to the
interconnecting pins are clamped to the ends of the
associated leads. To replace damaged end-lead pin
connectors, remove the old pin connector from the end
of the lead and clamp the replacement connector to the
lead.
Some of the pin connectors are grouped together and
mounted in a plastic holder; the overall result is that
these connectors are removed and installed as a multi-pin
connector. To provide correct orientation of this multi-
pin connector when it is replaced, an arrow (or dot)
is stamped on the circuit board and a matching arrow is
molded into the plastic housing of the multi-pin
connector. Be sure that these arrows are aligned when
the multi-pin connector is replaced. If the individual
end-lead pin connectors are removed from the plastic
holder, note the color of the individual wires for
replacement.
Switch Replacement.
Pushbutton switches and a cam-
type switch are used in the 7B92. It is recommended that
both switch types be replaced as a unit. Refer to Fig. 3-2
for cam-switch removal and to Fig. 3-3 for pushbutton
switch removal.
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