Some components are expected to wear out over UNIT-4’s lifetime - main examples being batteries and speaker drivers. UNIT-4 has been designed to be disassembled with glue-free design by anyone with 2 screwdrivers and AIAIAI’s step by step repair guides. This will make sure your UNIT-4's will stay with you for as long as possible.

TOOLS

All you need is a thin, hard plastic tool or an old credit card and 2 cross head screwdrivers. We use a Phillips 00 and a Phillips 2.

REPLACING THE BATTERY

Remove the front panel

• Make sure UNIT-4 is turned off.
• Use a thin, hard plastic tool or an old credit card and pull off the front panel.

Remove front housing

• Take a screwdriver and remove all 16 screws as shown on the image below.

• Place UNIT-4 upright and carefully lean forward while supporting the front.
• If the front housing is too tight, we recommend using a flathead screwdriver or similar to pull the housing out. You can do this by pulling it out by the magnet locks.

Disconnect back housing cables

• Disconnect the 6 connectors on the back edge of the main circuit board.

Remove battery pack screws and battery packs

• Take a screwdriver and remove the 2 screws from each side.

• Lift out the battery packs.

Install new battery packs

• Slide battery packs in to place. The pack with the connectors is on the right hand side.
• Push the connecting cable underneath the bass vent.

• Hand tighten the 2 screws in each side.

Reconnect the cables

• Reconnect the 6 connectors to the main circuit board.

Fix in front housing

• Carefully tilt up the front housing and push into place. 
• Make sure no cables are trapped.

• Add all the 16 screws and hand tighten.

Mount front panel

• Take the front panel and place on top of the front housing.
• Push with 2 thumbs on the 8 points shown below.