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[[File:Tek pg501 sc502.jpg | thumb | 300px | right | '''TM503 enclosure''' with [[PG501 | PG501 pulse generator]] and [[SC502 | SC502 oscilloscope]]]]
{{TM500 mainframe
The '''Tektronix TM503''' is a 3-bay mainframe for the [[TM500 system]]. All bays are low-power.
|mfg=Tektronix
|type=TM503
|function=three-bay mainframe
|image=Tek pg501 sc502.jpg  
|introduced=1972
|discontinued=(?)
|designers=Gunther Engert;Roger Stenbock
|manuals=
'''TM503'''
* [[Media:070-1305-00.pdf|TM503 Instruction Manual 070-1305-00]]
* [https://w140.com/tm503.pdf TM503 Technical Manual] (US Army)


The '''TM503A''' has a swivelling carrying handle.
'''TM503A'''
* [[Media:070-6568-00.pdf|TM503A Instruction Manual 070-6568-00]]


The '''TM503B''' also allows the power supply/backplane part to be removed from the case so that modules to be repaired on the bench without using extenders (see link below).  It also has openings for the [[TM5000]] GPIB feature, but not the connectors nor the power good signal for TM5000 plugins.
'''TM503B'''</br>
* [[Media:070-7808-00.pdf|TM503B Instruction Manual 070-7808-00]]
}}


==Option 2==
All bays are low-power. It has a single strap carrying handle on the right side.
 
The '''TM503A''' moves the power switch to the rear and has a swiveling carrying handle that can also act as a stand.
 
The '''TM503B''' retains the power switch position and changes the handle material to plastic. It also allows the power supply/backplane part to be removed from the case so that modules to be repaired on the bench without using extenders (see link below).  It also has openings for the [[TM5000]] GPIB feature, but not the connectors nor the power good signal for TM5000 plugins.
 
{{MissingSpecs}}
 
===Option 2===
Option 2 adds internal pin headers for each slot as well as rear 50-pin and BNC connectors, allowing for custom wiring to, from and between plugins.
Option 2 adds internal pin headers for each slot as well as rear 50-pin and BNC connectors, allowing for custom wiring to, from and between plugins.


On the standard TM503, cutouts for three BNC sockets have been made in the rear frame, meaning that the user only needs to drill holes in the rear cover plate to install the sockets.
On the standard TM503, cutouts for three BNC sockets have been made in the rear frame, meaning that the user only needs to drill holes in the rear cover plate to install the sockets.


==Manuals==
===Option 7===
* [http://w140.com/tm503.pdf Tektronix TM503 Manual (PDF)]
Option 7 adds barrier keys (214-1593-02) and connections on the rear interface to allow connections between a [[DC502|DC502 Opt.7]] to a [[TR502]] or [[SW503]], such that the center or marker frequency of a sweep can be read of the DC502.  
 
{{MissingSpecs}}


==Links==
==Links==
* See [[TM503/Repairs|Repairs page]] for video and replacement PCBs
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_500/TM503B/TM503B.html TM503B @ amplifier.cd]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_500/TM503B/TM503B.html TM503B @ amplifier.cd]
* [https://paulcarbone.com/blog/tektronix-tm-503-repair/ TM503 repair @ paulcarbone.com]
* [https://paulcarbone.com/blog/tektronix-tm-503-repair/ TM503 repair @ paulcarbone.com]
* [https://www.electronicdesign.com/technologies/test-measurement/article/21137778/the-tektronix-function-generator-teardown The Tektronix Function Generator Teardown] - Paul Rako @ electronicdesign.com
* [https://www.electronicdesign.com/technologies/test-measurement/article/21137778/the-tektronix-function-generator-teardown The Tektronix Function Generator Teardown] - Paul Rako @ electronicdesign.com
{{Documents|Link=TM503}}
{{Documents|Link=TM503A}}
{{Documents|Link=TM503B}}
==Internals==
The [[TM500 and TM5000 pass transistors|pass transistors]] on the low-power compartments are MJE2901 (151-0373-00, PNP) / MJE2801 (151-0349-00, NPN) − 60 V, 10 A, h<sub>fE</sub> 25 - 100.


==Pictures==
==Pictures==
===TM503===
<gallery>
<gallery>
TM503_open1.jpg      | TM503 inside
TM503_open1.jpg      | TM503 inside
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TM503_PSU1.jpg      | TM503 PSU
TM503_PSU1.jpg      | TM503 PSU
TM503_PSU2.jpg
TM503_PSU2.jpg
</gallery>
===TM503A===
<gallery>
TM503A_front.jpg      | TM503A front
TM503A_top.jpg  | TM503A top
TM503A_rear.jpg      | TM503A rear
</gallery>
===TM503B===
<gallery>
Tek_tm503b_front_plugins.jpg  | TM503B Front view with plugins
Tek_tm503b_front_plugins.jpg  | TM503B Front view with plugins
Tek_tm503b_front_plugins02.jpg | TM503B Front view with [[PG502]], [[SG504]] and [[RO510]] plugins
Tek_tm503b_front_plugins02.jpg | TM503B Front view with [[PG502]], [[SG504]] and [[RO510]] plugins
Tek_tm503b_front_noplugins.jpg | TM503B Front view without plugins
Tek_tm503b_front_noplugins.jpg | TM503B Front view without plugins
Tek_tm503b_label.jpg          | TM503B internal view
Tek_tm503b_label.jpg          | TM503B
Tek_tm503b_side_view.jpg      | TM503B side view  
Tek_tm503b_side_view.jpg      | TM503B side view  
Tek_tm503b_rear_view.jpg      | TM503B rear view
Tek_tm503b_rear_view.jpg      | TM503B rear view
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Tek_tm503b_extender02.jpg      | Using a TM503B for repairing plugins
Tek_tm503b_extender02.jpg      | Using a TM503B for repairing plugins
</gallery>
</gallery>
====Schematics====
===Schematics===
<gallery>
<gallery>
TM503-schematic.png | TM503 schematic
TM503-schematic.png | TM503 schematic
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</gallery>
</gallery>


[[Category:TM500 mainframes]]
[[Category:Manual needed]]
[[Category:Introduced in 1972]]
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