TM503

Manuals – Specifications – Links – Pictures

The Tektronix TM503 is a three-bay mainframe for the TM500 system.

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.

Key Specifications

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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.

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.

Option 7

Option 7 adds barrier keys (214-1593-02) and connections on the rear interface to allow connections between a DC502 Opt.7 to a TR502 or SW503, such that the center or marker frequency of a sweep can be read of the DC502.

Links

• See Repairs page for video and replacement PCBs
• TM503B @ amplifier.cd
• TM503 repair @ paulcarbone.com
• The Tektronix Function Generator Teardown - Paul Rako @ electronicdesign.com
• TM 503 Power Supply check in and repair by Zenwizard Studios @ YouTube

Documents Referencing TM503

Document	Class	Title	Authors	Year	Links
Tekscope 1972 V4 N3 May 1972.pdf	Article	TM500 series - A New Dimension in Plug-in Instrumentation	Bob Ragsdale	1972	TM500 system • TM501 • TM503 • FG501 • FG502 • RG501 • PG501 • SG502 • DC501 • DC502 • PS501 • PS502 • PS503
Tekscope 1975 V7 N2.pdf	Article	The TM500 Mobile Test Lab	Dick Brown	1975	TM503 • MICS
067-1201-99 TM500 Power Module Constr Note.pdf	Application Note	TM500 Power Module Tester and Utility Power Supply	Warren Collier	1977	TM500 • TM501 • TM503 • TM504 • TM506 • TM515

Documents Referencing TM503A

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Documents Referencing TM503B

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Internals

The pass transistors on the low-power compartments are MJE2901 (151-0373-00, PNP) / MJE2801 (151-0349-00, NPN) − 60 V, 10 A, h_fE 25 - 100.

Pictures

TM503

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  TM503 inside

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  TM503 backplane

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  TM503 PSU

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TM503A

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  TM503A front

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  TM503A top

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  TM503A rear

TM503B

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  TM503B Front view with plugins

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  TM503B Front view with PG502, SG504 and RO510 plugins

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  TM503B Front view without plugins

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  TM503B

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  TM503B side view

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  TM503B rear view

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  TM503B top view

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  TM503B bottom view

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  TM503B power supply front view

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  TM503B power supply top view

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  TM503B power supply rear view

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  Using a TM503B for repairing plugins

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  Using a TM503B for repairing plugins

Schematics

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  TM503 schematic

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  Block diagram

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  Interface connectors

Components

Some Parts Used in the TM503

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Some Parts Used in the TM503A

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Some Parts Used in the TM503B

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