HP 211B Power Supply Adjustments
-20V supply is spot on. -70V supply would not adjust at all.
UPDATE: the PNP transistor is fine. There's an 8.2kΩ resistor (behind the red capacitor) that read over 1MΩ on test. Replaced that, and the supply came back up to the specified voltage, and could be adjusted with the preset pot.
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Uploaded on October 6, 2018
Taken on October 6, 2018
HP 211B Power Supply Adjustments
-20V supply is spot on. -70V supply would not adjust at all.
UPDATE: the PNP transistor is fine. There's an 8.2kΩ resistor (behind the red capacitor) that read over 1MΩ on test. Replaced that, and the supply came back up to the specified voltage, and could be adjusted with the preset pot.
157
views
0
faves
0
comments
Uploaded on October 6, 2018
Taken on October 6, 2018