DM504A: Difference between revisions

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DM504A (view source)

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Peter

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 designers=
 |manuals=
-* [[Media:070-6945-00.pdf|Tektronix DM504A Manual]]
+* [[Media:070-6945-00.pdf|DM504A Operator Manual 070-6945-00]]
+* [[Media:070-7135-00.pdf|DM504A Service Manual 070-7135-00]]
 {{ROM Images}}
 * [[Media:160-5426-05.bin|160-5426-05]] / [[Media:160-5426-00.bin|160-5426-00]] (27C64) ''please add''
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 ==Links==
 * [http://www.barrytech.com/tektronix/tektm500/tekdm504a.html DM504A @ barrytech.com]
+* [https://youtube.com/watch?v=b-xhF_-hiqM DM504A repair] by VintageTEK Museum @ YouTube
 {{Documents|Link=DM504A}}
 ==Internals==
-The DM504A has no rear interface I/O.
+The DM504A has no rear interface I/O. The entire circuit is supplied from a +12/−12/+5 V floating power supply that uses a small mains-frequency transformer fed by one of the mainframe's 25 V<sub>AC</sub> windings.
-The circuit is based on an [[Intel 8031|80C31]] microcontroller with a Texas Instruments TL500C integrating A/D front-end and an ICL8069 reference.  There is a 93C46 EEPROM (cal constants?)
-The entire circuit is supplied from a +12/−12/+5 V floating power supply that uses a small mains-frequency transformer fed by one of the mainframe's 25 V<sub>AC</sub> windings.
+The circuit is based on an [[Intel 8031|80C31]] microcontroller with a Texas Instruments TL500C integrating A/D front-end and a 1N827 temperature-compensated zener reference.  The DM504A is software-calibrated, storing cal constants in a 93C46 EEPROM.  Calibration is triggered by pressing Up and Down buttons simultaneously while the internal cal jumper is in the "enabled" position.
 ==Pictures==