Tektronix TM 515 User Manual

@ JAN
1980
Anode
NOTE

Pushbution Switches
A cam-type switch repair kit including necessary
tools, instructions, and replacement contacts is
available from Tektronix, Inc . Order Tektronix Part
No .
040-0541-00 .
the switch, and lift the cover off the switch . The switch is
now open for inspection or cleaning .
4 . To remove the care arum from the front support
block, remove theretainin,
~fromtheshaftonthefront
of the
switch and slide the cam drum out of the support
block . Be careful not to lose the small detent roller .
~y
"

Reddot, cathode
Short bulb
Rg . 3-3 . Light-emitting diode (LED) lead orientation Illustration .
Maintenance-TM 515
The pushbutton switches are not repairable and should
be replaced as a unit if defective . Use a suction-type
desoldering tool to remove solder from the circuit board
when removing these switches .
The
cam-type
switches consist of rotating cam drums
which are turned by front-panel knobs, and sets of spring-

incandescent
Bulbs
leaf contacts mounted on adjacent circuit boards . The

Most of these light bulbs are mounted on thesub-panel
contacts are actuated by lobes on
the cams : These

using plastic sleeve
stand-offs
. Unsolder
the lead wires
switches can be disassembled for inspection, cleaning,

andpullthebulboutofthesleevefromtherearofthesub-
repair, or replacement as follows :

panel . Extreme care should be exercised to keep from
1
.
Remove the screws
which hold the metal cover on

melting the plastic .
2 . To completely remove a switch from the circuit

Light-Emitting Diodes
board, first remove any knobs or shaft extensions .
Loosen

LED's used as indicators are mounted on
the
sub-
the
coupling at the potentiometer at the rear of the switch,

panels with plastic sleeve sockets similar to the incandes-
and pull the long shaft out of the switch assembly .

cent bulbmountingsortheyaresoldereddirectlytoasub-
assembly and so mounted that they protrude through
3 . Remove the screws
(from the
opposite
side of the

holes in the panel . In these cases, the sub-assembly must
circuit b .~rd) that hold the cam drum to the board .

be exposed
and the anode and cathode lead orientations
carefully noted before unsoldering the defective LED . See
Fig . 3-3 for LED lead identifying information .
Power Transformer
Replace the transformer only with a Tektronix direct
5 . To replace
defective switch contacts, follow the

replacement transformer . Refer to the exploded view
instructions given in the switch repair kit .

drawing at the rear of this manual for
disassembly
necessary to expose the power
transformer . Refer
to
the
schematic
diagram color-coding and lead identification
6 . To re-install the switch assembly, reverse the above

information for correct wiring . After replacement, check
procedure .

out the power supply voltages before installing a plug-in
.
Top
of character
Long bulb

Sewn- :pment eharaaer chip
2020-1 "
3-7
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Tektronix TM 515 Specifications

General

Brand	Tektronix
Model	TM 515
Category	Power Supply
Language	English