Tektronix TM 504 User Manual

System
Maintenance—
TM
504
Interconnecting
Pins.
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
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.
If the old
pin was bent
at
an angle
to
mate with
a connector, bend the new
pin
to
match the
associated pins.
NOTE
A
pin
replacement kit including necessary
tools,
instructions, and
replacement pins is available from
Tektronix
,
Inc. Order
Tektronix Part No.
040
-
0542
-
00
.
Cam Switches. Repair
of
cam-type switches
should be
undertaken only
by
experienced maintenance
personnel.
Switch alignment
and
spring tension
of the contacts
must
be carefully maintained for proper
operation
of
the switch.
For assistance, contact your local Tektronix Field Office
or
representative.
NOTE
A cam
-type switch repair kit
including
necessary
tools, instructions, and
replacement
contacts
is
avail-
able from
Tektronix, Inc.
Order Tektronix
Part No.
040
-
0541
-
00.
The cam-type
switches consist
of rotating cam drums
which
are
turned
by
front-panel
knobs, and
sets of
spring-leaf contacts
mounted on adjacent circuit
boards.
The
contacts are actuated
by
lobes on the cams. These
switches
can be disassembled for inspection, cleaning,
repair, or replacement as follows:
3. Remove
the
screws (from the
opposite side of the
circuit
board) which hold the
cam drum
to
the
board.
4.
To remove the cam
drum from the
front
support
block, remove the retaining
ring
from
the
shaft
on
the
front
of
the
switch
and
slide the
cam drum out
of
the
support
block.
Be careful not
to lose the small
detent roller.
5. To
replace
defective
switch
contacts,
follow
the
instructions
given
in the switch
repair
kit.
6.
To
re-install
the
switch
assembly,
reverse
the
above
procedure.
Pushbutton
Switches.
The
pushbutton
switches
are
not
repairable
and should
be replaced
as
a
unit if
defective.
Use
a
suction-type
de-soldering
tool to remove
solder from
the
circuit
board when removing
these
switches.
Incandescent
Bulbs.
Most of these
light bulbs
are
mounted
on
the sub-panel
using plastic sleeve
stand-offs.
Unsolder the
lead wires and pull the bulb
out
of the sleeve
from the rear
of
the sub-panel.
Light-Emitting Diodes.
LED's
used
as
indicators are
mounted on
the sub-panels
with plastic sleeve sockets
similar
to
the incadenscent bulb mountings
or
they
are
soldered
directly
to a
sub-assembly and
so
mounted that
they
protrude
through holes in the panel.
In these cases, the
sub-assembly must be exposed
and
the
anode
and
cathode
lead orientations
carefully
noted
before
unsoldering
the
defective
LED. See
Figure
3 for LED lead identifying
information.
1
.
Remove
the screws which hold the
metal cover on the
switch,
and
lift the
cover
off the switch.
The switch is
now
open
for inspection
or
cleaning.
2.
To
completely remove
a
switch
from the circuit
board,
first
remove any knobs
or
shaft extensions.
Loosen
the
coupling
at
the
potentiometer
at the rear of the switch,
and
pull
the long shaft
out
of the switch
assembly.
Power Transformer.
Replace the transformer
only
with
a
Tektronix
direct replacement
transformer.
Refer
to
the
exploded
view drawing
at
the
rear of the
Power Module
manuals for
disassembly
of
the
rear panel
to
expose the
power transformer. Refer
to
the
schematic
diagrams color-
coding information
for correct wiring.
After
replacement
check
out the power supply
voltages
before installing
a
plug-in
module.
®
13

Tektronix TM 504 Specifications

General

Brand	Tektronix
Model	TM 504
Category	Control Unit
Language	English