When is it appropriate to replace the board?

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If serious damage is visible to the naked eye on the module, carbon deposits on the components or cracks on the board, it is better to replace the control unit. Or when the unit is in perfect external condition, and the cause is clearly in it.

Location
The unit is located immediately behind the front panel, which is marked with selector positions and indicator designations. To access the board, the panel must be removed.

Dismantling
First remove the front panel, usually it is attached with countersunk canada telegram data screws or latches. Then take a photo of the location of all the wires and only then dismantle the boards. Just be careful, they are fragile.

Checking components
Inspect the boards. If necessary, wipe them with alcohol. If they are in perfect external condition, it is better to consult a specialist. If there are burnt-out elements, then they need to be disconnected and new ones soldered. Carefully inspect the contacts. It is possible that the reason is in them. They often oxidize in a humid environment and stop working properly.

Black or green colors indicate the presence of oxides. They need to be cleaned with a moderately sharp object, such as a screwdriver or the blunt side of a knife. For fine cleaning, use a cotton swab soaked in alcohol. Just don't use too much alcohol. If the contacts are clean, then it's all about the board elements. A multimeter or a capacitor tester will definitely come in handy to check them. You can get by with a regular ohmmeter, but you won't be able to check everything.

Repair of the control unit "Arcadia"
Replacement of components on the control board is performed with a soldering iron with a thin tip or with a soldering station. In any case, work carefully, do not overheat the components (especially semiconductors) and observe safety precautions.