Tektronix 7613 User Manual

Maintenance—7613/R7613 Service
Location
of Screws
Fig. 4-8. Location of screws holding Signals Out rear panel.
Semiconductor Replacement. Semiconductors should
not be replaced unless actually defective. If removed from
their sockets during routine maintenance, return them to
their original sockets. Unnecessary replacement of semi-
conductors may affect the calibration of this instrument.
When semiconductors are replaced, check the operation of
the part of the instrument which may be affected.
5
) CAUTION
POWER switch must be turned off before removing
or replacing semiconductors.
Replacement semiconductors should be of the original
type or a direct replacement. Fig. 4-5 shows the lead
configuration of the semiconductors used in this instru-
ment. Some plastic case transistors have lead configurations
which do not agree with those shown here. If a replacement
transistor is made by a different manufacturer than the
original, check the manufacturer's basing diagram for
correct basing. All transistor sockets in this instrument are
wired for the standard basing as used for metal-cased
transistors. Transistors which have heat radiators or are
mounted on the chassis use silicone grease to increase heat
transfer. Replace the silicone grease when replacing these
transistors.
WARNING }
Handle silicone grease with care, Avoid getting
silicone grease in the eyes. Wash hands thoroughly
after use.
4-14
An extracting tool should be used to remove the 14- and
16-pin integrated circuits to prevent damage to the pins.
This tool is available from Tektronix, Inc. Order
TEKTRONIX Part No. 003-06 19-00. If an extracting tool is
not available when removing one of these integrated
circuits, pull slowly and evenly on both ends of the device.
Try to avoid having one end of the integrated circuit
disengage from the socket before the other, as this may
damage the pins.
Access to Power Transistors. The power transistors
associated with the Low-Voltage Power Supply are
mounted on the heat radiator at the rear of the instrument.
To gain access to these transistors, remove the screws which
secure the plastic protective cover to the heat radiator. The
transistors are mounted in sockets so they can be removed
from the rear by taking out the two screws in the mounting
tabs (cases elevated above chassis; be sure power is off). To
replace the sockets, refer to the procedure for removal of
the Low-Voltage Regulator circuit board.
NOTE
After replacing a power transistor, check that the
collector is not shorted to ground before applying
power.
Interconnecting Pin Replacement. Interconnecting pins
are used to interconnect many of the circuit boards in the
7613. Two types of mating connectors are used for these
interconnecting 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,
an end-lead pin connector is used which mates with the
interconnecting pin. The following information provides
the replacement procedure for the various types of inter-
connecting methods.
A. CIRCUIT-BOARD PINS.
NOTE
A circuit-board pin replacement kit including
necessary tools, instructions and replacement pins is
available from Tektronix, Inc. Order TEKTRONIX
Part No. 040-0542-00.
To replace a pin which is mounted on a circuit board,
first disconnect the 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.
7613

Tektronix 7613 Specifications

General

Brand	Tektronix
Model	7613
Category	Test Equipment
Language	English