How to open a Maken MK-410 that won't open with a key

If a Maken MK-410 cash drawer arrives on site and the key just turns in the lock without opening it, the drawer has almost certainly taken a knock in transit and the drawer body is jammed behind the spring inside the housing. It's a five-minute fix with a Phillips screwdriver — no replacement needed and no warranty case.

Before you start

• A Phillips-head screwdriver. Nothing else needed.
• A flat work surface. The drawer is heavier than it looks once the cover is off.
• Roughly five minutes of bench time per unit.

Open the housing

1. Flip the drawer upside down so the rubber feet point upwards and the front of the drawer faces you.
2. Unscrew the four rubber feet, one in each corner.
3. Remove the four screws at the corners of the metal base plate. Leave the screws in the centre alone — those hold the solenoid and spring mechanism in place and you don't want them moving.
4. Slide the base plate forward to release it from the housing slots, then carefully flip the drawer back the right way up.

Free the drawer body

1. Lift the top cover off.
2. Release the drawer body from the spring and pull it out. The cash drawer insert can get in the way at this point — slide the whole assembly out together if it makes it easier.
3. Remove the insert from the drawer body so you can see the wheels on the underside of the drawer.

Reassemble

1. Line the drawer wheels up with the metal tracks inside the main housing.
2. Slide the drawer in and confirm it moves freely along the tracks. If it binds, the wheels are off the track — back it out a few centimetres and re-seat.
3. Put the insert back in.
4. Refit the top cover, slide the base plate back into its slots, and replace the four base-plate screws and the four rubber feet.
5. Test: with the printer trigger or the manual key, the drawer should now pop open cleanly.

If that didn't work

• If the drawer still binds after re-seating the wheels, check that the spring on the solenoid mechanism is intact and seated.
• If the key turns freely but the lock cylinder doesn't engage the latch at all, the lock itself is faulty rather than the drawer. That's a warranty case.
• If the drawer pops open with the key but won't open from the printer trigger, the issue is the RJ11 cable, the printer's drawer-kick voltage, or the solenoid coil — different problem; see the printer/POS side first before opening another drawer.

When to raise a ticket

If after this procedure the drawer still won't open, raise an RMA at /support/rma-warranty with the drawer serial number from the label on the underside, your invoice or PO reference, and a short note describing what you tried.