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Testing The Power Supply

Most of the testing should have happened along with the building of the power supply.

—– PSU: Test that the voltage across the jack terminals is roughly 12V AC. Note that it could be as low as 10, or as high as 14. The voltage across each capacitor should be about 15 Volts DC. Again, this has give. - Finally test that the voltage across the middle pin of where IC20 will go, and the left pin (with the white dot) is higher then 8V DC. (probably around 13, but Your Mileage Might Vary). Now, test what you have done, by checking that the voltage across C6 is 5V (+/- .5 V). Solder in the 7806 (IC21), again watching for orientation, and solder in the other .1uF caps (C1, C2). To test, verify the voltage across C1 is 6V (+/- 1 V)

The 5.333 Voltage reference

Attach your multimeter to Pin 1 of J4, grounding it (A good place to ground is R179, on the side opposite of where the power jack plugs in) and adjusting TM6 until you get 5.333 Volts. Finally verify that the voltage at pin 3 of J4 is around 12 Volts. The voltage should actually be 11.851V. (there is probably some tolerance here as well) ==== Common Mistakes ==== * Not putting in the Voltage Regulators right (IC20, IC21, IC22) * Reversing Polarity of the Electrolytic Caps * Using wrong trim pot - make sure you are using the correct one. The printing is faint but they are each different.

Extended testing/troubleshooting notes will go here however.

/home/ladyada/public_html/wiki/data/pages/x0x/pstesting.txt · Last modified: 2016/01/28 18:05 (external edit)