How to dismantle the Belkin Pro-Gold Series of UPS Power Supplies, Models 325VA, 425VA, 525VA, and 625VA, and how to replace the internal fuses.

Replacement fuses.

These are standard car blade-fuses (European models) with two flat spade tags 5.5mm x 1.0mm
Fuse sizes:
Model 325VA: 30Amp 32Volt (usually blue)
Model 425VA: 30Amp 32Volt (usually blue)
Model 525VA: 40Amp 32Volt
Model 625VA: 40Amp 32Volt
Cross-head screwdriver
50W (minimum) soldering iron and solder
Solder-sucker
Set of feeler-gauges or similar shaped tool - but not a screwdriver as it will ruin the plastic case.

Remove the two cross-head screws at the back end of the battery compartment
Facing the front, gently ease the top edge of one side of the grey front cover forwards, just enough to insert a stiff feeler gauge at each side between this cover and the black case, at the points 'A' shown below (approx. 35mm down from the top edge)
Gently press the end of the gauge inwards at this point until it releases the plastic clip inside the case, unclipping the front cover on that side
Repeat this at the opposite side of the case until the front cover is released and can slide off upwards
Disconnect the white 4-pin plug and socket with the Brown and Blue wires coming from the top panel of power sockets
Prise the sides of the black case apart to release the top panel containing the rows of output sockets. Twist this panel sideways out of the way
Lift off the black insulation sheet
Unclip the smaller 4-pin socket located on the edge of the Printed Circuit Board
Prise the sides of the black case apart to release the large green printed circuit board, then twist the board upwards and locate the pair of fuses at the back left hand corner marked FU-1 and FU-2. Visually check that they have blown or use a continuity meter. Take care not to bend any of the components
Using the solder-sucker, carefully unsolder the fuses and remove them
Make sure the slots are clear and free from solder
Try the replacement fuses in the slots and cut the tags shorter if they protrude too much
Solder the new fuses in position

(Facing the back of the unit)

Reconnect the smaller 4-pin white plug on the Printed circuit board making sure it clicks into position
Hold the 4-Pin plug to one side and the top panel connections in the corner, prise the sides of the case apart and carefully clip the board back into position, making sure the slots on each side locate with the black plastic case correctly
Check that the 9-pin serial connector lines up with the rectangular hole above the battery compartment
Refit the black plastic insulating sheet over the circuit board, shiny side down, making sure it doesn't obscure the four LED indicator lenses*. The two holes in the sheet should line up with the spigots on the top cover plate
Reconnect the 4-pin Plug and socket with the Brown and Blue wires from the top cover
Lower this top cover onto the main case and press down hard in each corner until it clips into position
Refit the grey front cover by tucking it in at the bottom then pressing inwards until it clicks in place
Replace the two cross-head screws at the back of the battery compartment using 'blue-tack' to hold them onto the screwdriver
Refit the battery taking great care to connect the terminals correctly (RED to RED, BLACK to BLACK!) otherwise you will blow the new fuses
Reconnect the mains supply and all four LED's should come on momentarily, then just the left hand green one will show that the mains supply is present.
* If there are no lights at all you may have accidentally covered the lenses when replacing the insulating sheet

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How to dismantle, replace, or repair the internal fuses in the Belkin Pro-Gold Series UPS Power Supplies, Models 325VA, 425VA, 525VA, and 625VA If your Belkin UPS standby Power Supply has packed up, i.e. no output, no lights, no warning beeps, and absolutely dead, even if the battery still has some life in it, then there's a good chance that one or both of the internal fuses have blown. Belkin does not publish any information about these fuses, as they are not intended to be replaced by the user. However, if the unit is out of warranty and you feel confident enough with a soldering iron, then here are some suggestions. WARNING: A UPS Power Supply generates MAINS VOLTAGE from its internal battery whenever the mains supply is removed. It is therefore absolutely essential that you completely remove the battery from the unit and also remove the mains supply cable, before attempting to open the unit. Do not attempt the following if the unit is still under warranty!