PS503/Repairs: Difference between revisions

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(Replaced content with "* [https://www.youtube.com/watch?v=--AbTooK15s Tektronix PS503 and PS503A Dual Power Supply Repairs] by Bob Haas, VintageTEK Museum @ YouTube Category:Instrument repair reports")
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* [https://www.youtube.com/watch?v=h5ZH7e3sXbo Tektronix PS503A Power Supply Restoration] by NFM @ YouTube
* [https://www.youtube.com/watch?v=--AbTooK15s Tektronix PS503 and PS503A Dual Power Supply Repairs] by Bob Haas, VintageTEK Museum @ YouTube
 
 
==PS503A Manual==
There is an error in the circuit drawing: All amplifiers are connected to +5 V or -5 V. In fact they are connected to the +6.2 V or -6.2 V supply.
 
==PS503A: Instable Output/Output voltage is decreasing with time==
The output is instable (±100 mV) and is decreasing with time.
The faulty part was C34 (4.7 µF/50 V). C34 stabilises the reference voltage. Measuring C34 with an RLC-meter shows no fault: 5.0 µF and a serial resistance of 5 Ω. The faulty behaviour of C34 can only be seen by applying a DC voltage (see picture).
C34 is shorted by the output-on button. So, replacing C34 with a tantalum capacitor is not recommended.
 
 
==Pictures==
 
<gallery>
PS503A - Current C34.png|DC current thru C34 (12 V / 10 mA limit)
</gallery>
 
 


[[Category:Instrument repair reports]]
[[Category:Instrument repair reports]]

Latest revision as of 07:32, 17 November 2024

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