BNB Replacement

This guide will go through removing a used BNB (bar in box) and installing a replacement. Please note that BNB’s are shipped with a shipping fluid that will need to be purged out.

Before starting this replacement, ensure that the printer’s firmware is up to date and the printhead is in its lowest position

Remove the top orange cover attached by 4 x M4 screws (T20 torx)

Cover lifts off:

Remove back covers attached by 5 x M4 Screws (T20 torx)

Remove front wrap by removing 3 x M4 screws (T20 torx)

The next step is to start disconnecting cables from the upper section to the lower section. Zip ties may need to be cut. Make note of the wire routing on your printer so that wires can be routed the same way after replacement.

Unplug the Ethernet and USB cable(s) from the HP main board. This is located in the lower portion of the printer

Carefully disconnect the three flat flexible cables from the HP Utility board. Route cables so they are contained in the lower section of the prnithead.

Disconnect the power supply cable from the HP utility board. Route cable so it is contained in the lower section of the printhead

Disconnect the door switch connection at the HP utility board - route wires to lower section of printer

Disconnect the secondary door switch connection - route wires to lower section of printer

Disconnect mains power from the HP utility board - route wires to lower section of printer

Now that all electrical connections are separated from the top portion of the printer, remove the four bolts (T40 torx / 13mm wrench) attaching the linkage arms. During this process, make sure the top portion of the printer is supported as it can fall when the last bolt is removed. A ball nosed torx bit is suggested if available.

Once all four screws have been removed, the top section of the printer can lift off:

Remove the right upper cover attached with 3 x M4 screws (T20 torx)

Remove the left cover attached by 5 x M4 screws (T20 torx):

Remove the lower front cover and ink door attached by 4 x M4 screws (T20 torx):

Remove the service sled door by loosening the 4 x M3 screws (T10 torx). Door pulls off:

Carefully lift up the PCB tray - note that there is a small black clip that needs to be unclipped as you lift up:

Secure the hinged plate so it does not fall over. Carefully disconnect three flat flexible cables from the BNB:

Carefully disconnect the power supply cable and service sled cable from the main pcb:

PCB tray can now slide to the right to be removed:

Remove front chassis plate and locking bracket attached by 5 x M4 screws (T20 torx), 4 x M3 screws (T10 torx) and two M4 standoffs (8mm)

Remove upper chassis plate attached with 2 x M4 screws (T20 torx). These screws are located on the back side of the BNB

Remove the final 2 x M4 screws (T20 torx) securing the BNB to the chassis on the back side of the printer:

BNB can now be removed:

Remove the service sled from the new BNB before placing the new BNB into the chassis.

Place new BNB onto chassis - remove any shipping tape from the BNB.

Line up BNB so the two holes on the back chassis plate line up - install 2 x M4 screws (T20 torx). BNB should sit flush across back chassis plate:

Install upper chassis cross plate with 2 x M4 screws (T20 torx)

Install front chassis plate & chassis upright plate onto BNB - Note the small tab that needs to install into the BNB frame shown below.

The standoff marked 7 should be installed after chassis upright bracket is installed to provide driver clearance.

Install chassis upright plate using 4 x M3 screws (T10 torx)

Slide on the Hinged PCB plate:

Carefully attach the three flat flexible cables from the BNB to the main PCB. Make sure that the contacts are in the correct orientation. It is recommended to carefully double check each connection.

Connect the power supply cable:

Connect the service station drive cable:

The hinged PCB plate can now be lowered. Be sure to snap the small plastic piece in the BNB back into place as you are lowering:

Move tie rod arms so they are over the hinged PCB plate

Attach Exit cover plate with 2 x M4 screws (T20 torx)

Attach entry side cover plate with 1 x M4 Screw (T20 torx)

Attach front cover and ink door with 9 x M4 screws (T20 torx)

Lower printhead assembly is complete:

Ensuring not to pinch any wires, slide the top assembly onto the 4 upright posts on the lower section. The upper section can rest on the lower section.

Lift up the upper section so that the tie rods line up with their mounting holes. Insert the two front tie rod screws:

Secure back two tie rod screws - it may be necessary to lift up the upper section:

Route the Ethernet and USB cable(s) back down to the main PCB and install:

Reconnect the Door switches. Note there is no polarity on the two wires - they can be mixed up.

Route the power supply harness from the bottom section up to the HP utility board:

Route the main AC power harness from the power supply to the HP utility board:

Locate the 19 pin flat flexible cable (this should be the one that is the least thickest). Route the cable so it can not come in contact with the stepper motor, and connect to the HP Utility board. The blue tape should be up:

Locate the 18 Pin Flat Flexible cable. Route the cable so it avoids coming in contact with the stepper motor and install to HP utility board. The black tape should be towards the touchscreen on the printer.

Locate the 26pin Flat flexible cable and install it into the HP utility board. The black tape should be towards the touchscreen:

It is suggested to hold off putting the final covers on until the printhead has been purged of shipping fluid in the event that troubleshooting needs to occur.

Once the new BNB is fully installed, insert the service sled. Make sure it is entering evenly by pushing on the center with one finger. Select “install service sled” for it to pull the service sled in, then replace the side cover where the service sled enters.

Instructions on preparing the printer for purging can be found below: