I picked up a Behringer Europower Pmp560M. The power unit is starting primary side then shutting down. It has a number of diodes on the back. One has clearly failed and got a little hot and now has some chunky lumps of solder either side.

Anyway it is marked


  1. I have no idea how to look up component numbers besides googling (which got me nowhere.)
  2. I have no idea how you guys manage to take a code like that ^^ and return with a part number, manufacturer, date of creation, designers family pet name etc.

Please give me some tips for future projects.

The board is a power supply and amplifier.

Top of board:

Top Of Board

Bottom of board, you can see the 4 diodes to the right of the top separation hole:

Bottom of board, you can see the 4 diodes to the right of the top separation hole

The culprit:

The culprit

  • 1
    \$\begingroup\$ A photo would help a lot. Along with details of the circuit around it. \$\endgroup\$
    – Hearth
    Dec 27, 2020 at 21:09
  • \$\begingroup\$ D18 appears to have been replaced. It does not appear to be damaged. \$\endgroup\$
    – JRE
    Dec 27, 2020 at 21:43
  • \$\begingroup\$ The previous owner has not had work done on the unit, The only reason I have it was because he refused to pay the £40 he was quoted to have someone look at it and he has had it from new.. The 4 diodes are exactly the same besides this one and its solder bumps. \$\endgroup\$ Dec 27, 2020 at 21:51
  • 1
    \$\begingroup\$ It could have been replaced or even originally installed by hand in the factory. Overheating can't cause solder to magically appear. \$\endgroup\$
    – JRE
    Dec 27, 2020 at 22:06
  • \$\begingroup\$ No it hasn't magically appeared. It's clearly reflowed off the contact pads and into two giant balls of solder. \$\endgroup\$ Dec 27, 2020 at 23:35

1 Answer 1


Looks like a PANJIT International ER1J , Datasheet.

ER1J is the part number. PJ likely stands for "Panjit" and 6446 is probably a manufacturer specific code like a production date and may differ between parts.

  • \$\begingroup\$ Looks like your correct... Finding more with the second code.. which i didn't really search on its own as I thought thats was the "date code" or similar :P \$\endgroup\$ Dec 27, 2020 at 21:54

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