Tektronix 7B51 Instruction Manual page 46

Maintenance-Type 71351
Interconnecting Pins and Pin Socket Replacement. Two
types of mating connectors are used for these interconnect-
ing pins. If the mating connector is mounted on a plug-on
circuit board, a special socket is soldered into the board. If
the mating connector is on the end of a lead, a pin connec-
tor is used to mate with the interconnecting pin. The fol-
lowing information provides the replacement procedure for
the various types of pins and pin sockets.
A. CIRCUIT BOARD PINS . -To replace a pin which is
mounted on a circuit board, first disconnect any pin con-
nectors. Unsolder the damaged pin and pull it out of the
circuit board. Press the new pin into the hole in the circuit
board so the ferrule on the pin is centered in the hole in the
board. (Notice that the ferrule is not centered on the pin;
be sure the replacement pin is positioned in the same man-
ner as the original .) Solder the pin on both sides of the
circuit board. If the pin was bent at an angle to mate with a
connector, bend the new pin to match the associated pins .
The inside radious of this bend should not be less than
0.025 inch .
B. CIRCUIT BOARD PIN SOCKETS. The pin sockets
on the circuit boards are soldered to the rear of the board.
To replace the sockets, first unsolder the socket (use a
vacuum-type desoldering tool to remove excess solder).
Straighten the tabs on the socket to remove it from the
hole in the circuit board . Place the new socket in the circuit
board hole and press the tabs down against the board .
Solder the socket tabs to the circuit board .
4-8
Transistors
Fig. 4-3. Electrode configuration of transistors used in this instrument.
NOTE
The spring tension of the terminal 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 connec-
tors used to connect the wires to the circuit board pins are
clamped to the ends of the associated leads. To replace a
damaged pin connector, first remove the old pin connector
from the end of the lead . Clamp the new pin connector to
the end of the lead . Some of the pin connectors are
grouped together and mounted in a plastic holder . These
connectors are removed and re-installed as a unit . To pro-
vide correct orientation of this multi-connector when it is
replaced, an arrow is stamped on the circuit board_ and a
matching arrow is moulded into the plastic housing of the
multi-pin connector.
Switch Replacement. Two types of switches are used in
the Type 71351 . The pushbutton switches and the cam-type
switch should be replaced as a unit if damaged. The fol-
lowing special maintenance information is provided for the
cam-type and pushbutton type switches .
CAUTION
Repair of the cam switch should only be undertaken
by skilled maintenance personnel. Switch alignment
and contact spacing must be carefully maintained for
proper operation of the switch. The cam switch repair
kit contains special
alignment tools for use in
repairing or replacing the cam and contacts. For
information or assistance on maintenance of the cam
switch contact your local Tektronix Field Office or
representative .
FET