Maintenance
—
7623/R7623 Service
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.
k
S
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 transistorshave 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.
Handle
silicone
grease with care.
Avoid getting
silicone grease
in the eyes. Wash hands thoroughly
after
use.
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. 003-0619 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
7623.
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.
4-14
Summary of Contents for 7623
Page 1: ...MANUAL 7623 R7623 STORAGE OSCILLOSCOPE SERVICE MANUFACTURERS OF CATHODE RAY OSCILLOSCOPES ...
Page 51: ...Fig 3 2 Block diagram of Logic circuit Circuit Description 7623 R 7623 Service ...
Page 72: ...W NJ 00 Fifl 3 22 Low Voltage Power Supply detailed block diagram ...
Page 73: ...Circuit Description 7623 R 7623 Service ...
Page 74: ...CO NJ CD Fig 3 22 Low Voltage Power Supply detailed block diagram cont ...
Page 75: ...Circuit Description 7623 R 7623 Service ...
Page 97: ...Circuit Description 7623 R7623 Service 3 51 ...
Page 98: ...Circuit Description 7623 R7623 Service Fig 3 39 Output Pulses for the Storage Circuits 3 52 ...
Page 103: ...Circuit Description 7623 R7623 Service 3 57 ...
Page 108: ... Ç À Fig 4 2 Location of circuit boards in the 7623 ...
Page 109: ...Fig 4 3 Location of circuit boards in the R7623 Maintenance 7623 R 7623 Service ...
Page 113: ...Maintenance 7623 R7623 Service Fig 4 6 Circuit Isolation Troubleshooting Chart 4 9 ...
Page 165: ...7623 BLOCK DIAGRAM ...
Page 166: ...7623 R7623 Service Front of Board ...
Page 167: ......
Page 168: ...FL ...
Page 169: ......
Page 173: ...7623 Logic ...
Page 175: ...Vertical Interface A4 ...
Page 178: ...Vertical Interface ...
Page 180: ...Vertical Amp A5 ...
Page 184: ...Horizontal Amp A6 ...
Page 186: ...7623 TO P450 VERT AMP 3 HORIZONTAL AMPLIFIER ...
Page 188: ...Output Signals A7 ...
Page 190: ...FROM 7G23 Output Signals g ...
Page 195: ...FROM LV POWER SUPPLY 7623 CRT CIRCUIT ...
Page 197: ......
Page 200: ......
Page 202: ...Storage Output A14 ...
Page 204: ......
Page 205: ...7623 R7623 Service Fig 6 14 A15 Cal Storage circuit board ...
Page 208: ......
Page 209: ...7623 R7623 Service Fig 6 15 A16 Readout System circuit board ...
Page 213: ......
Page 242: ...7623 R7623 OSCILLOSCOPE b ...
Page 243: ...151 ...
Page 246: ...20 ...
Page 247: ...7623 R7623 OSCILLOSCOPE 112 ...