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It is CR19, part of the 5-volt rectifier circuit in the power supply assembly A22.? The HP description for part number 1906-0231 is “DIODE-CT-RECT 200V 15A.”?

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Looks like a fairly simple device to substitute with discrete diodes except that the high current rating might take some thermal consideration unless you can measure the actual current in that circuit and determine if the total current draw is small enough so as to? use them without any heat sinking.

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If you have only lost one leg of the diode pair it shouldn’t be too difficult to determine pin out with an ohmmeter.? From the way the schematic is drawn it looks like the case is the common between the two diodes.

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Varo and a few other manufacturers were well known for their “creative packaging” of some of their devices.? This apparently was one of them.

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A portion of the schematic is attached.

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Greg