BLUESKY Microwave Oven CMI-FR91940 Repair cracked timer knob.

Microwave oven with knob or inner knob that activates the timer is 'loose, turns 360º, multiple turns'.

The oven is disassembled by removing all the screws from the casing, the screw on the right side, was expressly placed by the manufacturer to make repair difficult, is a Torx T10 Security screw, (With a central security pin) The screwdriver for this type screw is now easier to find than it was years ago.

Once the casing is removed, we can access the interior, in the timer portion, we must remove the 2 Philips + screws that hold the front casing.

The 2 front knobs have an 'edge' so if the timer assembly isn't disassembled, they can't be removed.

Once the 2 screws have been removed, the casing design allows us to raise it slightly and pull it towards the front.

Once the casing is out, we can easily remove the 3 screws that hold the metal frame that supports the timer.

We see the timer chassis disassembled from the housing and the knob lip that prevents its removal as indicated in step 2.

View of the timer chassis.

View of the timer Dial or knob 'cracked' so it slips when inserted into the stem.

On this occasion, since they didn't have time to look for better solutions, having a metric 8 nut on hand, I tried the option of threading a nut on the plastic stem. Since there is plenty of space for the nut in the back.

Views of what the nut looks like placed on the plastic stem, performing its clamping job perfectly.

On this occasion a repair was carried out in 15 minutes.

Primary: The high voltage AT fuse is replaced. Its value usually ranges between 0.6 and 0.8 A. We should NEVER install a fuse of more than 1 Ampere.

Secondaary: If the fuse blows again, as a 2nd step we must replace: Fuse + HV capacitor. You have countless videos on this topic on YouTube.