Massage Chair Hand control Problem

I have spent several years repairing all makes of massage chair. I have learnt that even with the same model, electronics can change. When replacing a hand controller I have always checked to see that the frequency of the crystal on the main board matches the frequency of the crystal in the hand controller. Recently I received a chair which failed to respond to the hand controller – checking all parts everything seemed OK. However when I looked the frequency of the hand controller is...

Massage Chair Hand control Problem