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Old 21st May 2021, 10:29 pm   #3
DMcMahon
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Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,587
Default Re: Uher Report Monitor 4000 Start button won't engage

Hello and welcome to the Forum. Just had a quick look at my 4000 Report Monitor. A lot going on with the Play mechanism.

No good at videos plus have never uploaded a video so will try and partially explain with a couple of photos.

Photo 1 shows the back open and PCB hinged up. Note the aluminium drive wheel (drives the capstan shaft) with rubber bonded tyre (tire), the drive wheel has to be removed to see the area of interest.

Photo 2 shows a forked actuator arm, the top corner of the fork is touching the lower edge of a metal plate (brass coloured), this is with the Play key not pressed. The metal plate pivots a little and is is sprung loaded.

When the Play key is pressed down the forked arm moves down and moves a lever arm down (the forked arm is engaged with a pin/post on the lever arm) there is a little tab on the lever arm that when the Play Key is fully pressed down the tab moves just below the lower edge of the brass coloured plate and the brass coloured plate then springs down to latch/lock it in position. Photo 3 shows it latched, the watchmakers screwdriver is next to the tab.

So would suggest you remove your drive wheel and press the Play key down and check that the tab is not broken off and drops below the lower edge of the brass plate and then the plate should spring/drop down which will stop the lever arm from moving back up.

Looks impossible without a major strip down to see how the brass plate is sprung and also how the latch is reset.

David
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Last edited by DMcMahon; 21st May 2021 at 10:36 pm.
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