03 Power on your Obelisk

Depending on your hashing board configuration, there will be anywhere from two to six 6-pin PCI-e connectors located at the top of the Obelisk SC1/DCR1 for connecting the power supply unit. Each hashing board features two PCI-e connectors that, when installed, are accessible on the top side of the Obelisk SC1/DCR1.

Each hashing board must be powered by the same power supply unit to prevent potential damage to the machine. Please use the PSU provided by Obelisk to power your unit.

Shake test

This is recommended to ensure that your heat sinks did not come loose during shipping.

Inside your Obelisk, there are two main boards that each have 15 chips attached to them. These chips generate heat – lots of it. There are heat sinks attached to the chips whose job it is to dissipate that heat.

The heat sinks are covering the chips. They are small, black, and have multiple thin strips of metal that face up and away from the board. If a heat sink is loose, it can't dissipate the generated heat well enough and your board might overheat.

  1. Before powering on your unit, take your Obelisk into a quiet room.
  2. Gently shake the unit and listen for a rattling sound.
    We mean gently! A very light shake is all that's required – you're listening for a loose piece of metal or a partially attached heat sink. You'll hear something if it is loose.
  3. If you don't hear anything – and you probably won't – you're good to go! Proceed onto Attach the rubber feet, below.
  4. If you hear something, you'll want to inspect your heat sinks and make sure they are fully attached.

Inspect the heat sinks

This is recommended if you hear something during the shake test, or need to inspect your heat sinks for any other reason.

ESD Warning: In these steps, you'll be opening your Obelisk and may be touching internal parts. You must follow proper ESD safety, or you risk damaging your unit.
  1. Position the Obelisk in front of you with the front fan to the left, and the rear fan to the right. This positioning is recommended because your Obelisk' hashing boards and attached heat sinks will remain upright when you flip the unit in the coming steps. The front fan is easily identified, because it also has the ethernet port, lights, and button.
  2. Remove the four screws from the top black sleeve of your Obelisk. There are two on either side of the device.
  3. Pull the black sleeve off the top of the enclosure. The internal components of the Obelisk are now exposed.
  4. Gently tilt the Obelisk 90 degrees towards you, so that the boards are facing you. The Obelisk has metal screws that protrude from each side of the case which might damage the surface you lay them on. Take care to prevent damage to your work surface.
  5. Visually inspect the boards for the loose heat sink – try see if any heat sinks are uneven with the rest, or if any of the small silver clamps are disconnected from the brackets on the board.
  6. If you notice a loose heat sink, it's time to remove the board. Move on to the next set of steps.

Reattach a loose heat sink

This is only recommended if your shake test confirmed a loose piece.

ESD Warning: In these steps, you'll be opening your Obelisk and touching internal parts. You must follow proper ESD safety, or you risk damaging your unit.

Before proceeding with these steps, the Obelisk should be laying on its side, with the front fan to the left and the rear fan to the right. The boards should be facing you. This will help prevent any loose parts from falling into the case of the unit.

Heat Sink

The heat sink is the black metal piece with multiple thin strips.

Heat Sink Clip

The clip connecting the heat sink to the board is closed on one end and open on the other.

  1. If you notice a loose heat sink, it's time to remove the board. Gently grasp both ends of the board, taking care to not damage the board components. A good place to hold is the ends of the board, near the metal cutouts that the board is in. Pull it away from the Obelisk, slowly wiggling the board if necessary. The hashing board will disconnect from the Obelisk.
  2. Place the hashing board on a clean, ESD safe surface.
  3. Each chip is covered by one heat sink, attached with a heat sink clip. Completely disconnect the heat sink clip from the loose heat sink. The detach the clip, push down while pulling away on the two pronged side. Before attempting to reattach the heat sink, you should be able to identify and locate everything in the following image.
  4. Reseat the heat sink on the black base, which sits on top of the chip. It will rest right on top, and fall into place between two corner brackets in the lower left and upper right corners of the base.
  5. Reattach the heat sink clip. If you look at it from above, it should be centered on the heat sink. There's 10 strips of metal on the heat sink, and two will be in between the arms of the clip. There will then be four remaining on either side of the clip.
  6. The closed side of the clip goes under the notch in the board. The two open prongs on the right of the clip click under the base.
    Here's a side view that shows the left side in place, but the open prongs not yet clicked in.

    And here we see a view where the open prongs of the clip have been secured in place.
  7. Once all heat sinks are secure, it's time to reinsert the board back into the case. Do so carefully, and ensure that the connections of the hashing board safely fit into the connection of the control board inside the Obelisk. Standing the Obelisk back upright can be helpful during this step.
  8. Power on and test to make sure the unit powers up and all boards still hash.

Attach the rubber feet

Your Obelisk has rubber feet that can be attached to the unit. There are four screws that protrude from the bottom of the device, and these feet will make sure the screws don't scratch whatever surface they are on.

This must be done while the unit is off, so doing it right when you take it out of the box is great timing.
  1. Position the Obelisk in front of you with the front fan to the right, and the rear fan to the left. This positioning is recommended because your Obelisk has hashing boards with attached heat sinks inside the case, and you want to make sure these face up when you flip the unit in the next step. The front fan is easily identified, because it also has the ethernet port, lights, and button.
  2. Gently tilt the Obelisk 90 degrees away from you, so that you can see the bottom of the unit and the top is facing away. The Obelisk has metal screws that protrude from each side of the case which might damage the surface you lay them on. Take care to prevent damage to your work surface.
  3. Remove the rubber feet from their respective bag and begin by peeling one foot off of the sheet.
  4. Carefully place the foot onto the bottom of the Obelisk. It should be directly next to the screw, towards the edge of the Obelisk.
  5. Repeat step 3 with the remaining feet, ensuring that all four feet are parallel and perpendicular to each other to prevent wobbling. All feet should be next to one of the four screws on the bottom of the unit, towards the outer edge of the Obelisk.
  6. Carefully tilt the Obelisk back into its upright position and apply pressure to ensure a good bond between the metal, adhesive, and rubber.
Full adhesive strength is achieved in 24 hours.

Connect the power supply

  1. Connect PSU power cable connectors to each of the available PCI-e connector ports on top of the Obelisk SC1/DCR1.
  2. Find the power cable that came with your Obelisk SC1/DCR1 and connect it to your Obelisk PSU.
    Do not replace the power cord with an inadequately rated cord. If you have questions about which cords are adequate or not, please contact us.
  3. Connect the male end of the power cable into a power wall outlet.
  4. Connect a network cable to the Ethernet port on the bottom of the front fan grill.
  5. Power on the unit by flipping the switch on the back of the PSU from off to on.
Do not block either fan. The SC1/DCR1 require adequate cooling for optimal performance and any obstruction to the fans could cause damage to your device.

Airflow Guides

Your Obelisk SC1/DCR1 comes equipped with 2 airflow guides attached to each fan grill. These guides support the flow of air to the heatsinks on the hashing boards, allowing your unit to be adequately cooled with only 2 boards.

If you would like to add a third board to your unit, you will need to bend off the airflow guide carefully, removing it from the attached piece of metal on the fan grill. Be sure to do this for both airflow guides in the unit.

Do not unscrew the leftover metal from the fan grill. Though small, the leftover metal still supports the airflow to the boards, even with three boards installed in the unit.

Hashing Board: FYI

Connect hashing boards properly

If you ever find yourself using a single board in your Obelisk miner, make sure it is connected to slot 1 on the board.

If you are using two boards, ensure they are in slots 1 and 2.

Install a third board

If you're installing a third hashing board, follow these steps.

  1. Ensure the unit is powered off, that the PCI-e cables are disconnected from the top of the Obelisk, and that the PSU is removed from the top of the unit.
  2. Remove the top 4 screws on the cover of the enclosure.
  3. Carefully bend away the airflow guides from the two fan grills in the unit and remove them from the enclosure.
  4. Carefully slide the Hashing board through the PCB Guide and install the Hashing Board into the open connector facing upwards on the Control Board.
  5. Ensure proper connection is made and that all heatsinks in the unit are properly installed.
  6. Place the cover back over the Obelisk and screw the 4 screws back in.
  7. Re-connect the PCI-e cables to all 3 Hashing Boards and return the PSU to its proper configuration.
  8. Power on the unit and ensure that all three Hashing Boards installed and communicating.

Your Obelisk's fans

If only one board is connected to the Obelisk, only one of the device's fans will turn on.


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