Sadly, no other marking... It is rather confusing that the naming on the drawing is different from that on the board. I do not now if there are any common standard associated with those markings that make this clearly.
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Never thought about checking the color coding of the other cables, might be a good idea. After some translation of the labels on German it gets a little clearer:
AR: Power electronics unit for cooker
V3: Electric cooking plate
W1: power connector [!]
W2: signal connector [!]
K8: Residual heat indicator light display
X2: Ground for cooker
Z4:Bimetal
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Okey, I have a theory for W2: Looking on the cables from the K8 (Heat indicator) they are all going to LA, LB, LC, LD, all of those if looking on the backside of the board seems to go up to the circuit arround RX/TX white, VSS blue and VDD brown which are all part of W2 (the controll connectors). For me it make sens that those are a part of a signal system? With other word: Vss blue to W2 Vss, Vdd brown to W2 Vdd and Rx/Tx white to W2 Rx/Tx? I dont really know how those cookers works so maybe it is not correct at all...
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For W1 the following seems to be possible: N (blue) and N (blue) goes to supplying two stoves each, on the other side of the cookers V3 they end up in terminals "A", "C" and "D", "B". It make sense that those two can be considered as positive supply and both goes to Vdd [230V~ phase 1] and Vdd [230V~ phase 2] (phase 3 is used bye the oven), even if I thought the stove worked on AC and not DC, but maybe the notations Vss and Vdd are used even for AC circuits. To confirm this theory and make the L1 and L2 unambiguous and to solve Vss and Rx/Tx on W1, there can be seen that K8 (the heat indicator) has four signal in lines and one ("II") going to terminal L1 that seems to be some kind of ground supply. From that my theory is that L1 can been seem as a ground supply (for both K8 and half of the V3:s (by looking on the backside of the board it can be seen that L1 is supplying two stoves and L2 the other two)) and therefore L1 should connect to Vss on W1 (Vss - negativ/ground supply) and the last L2 to Rx/Tx. It can also been seen that the soldering to L1, L2, N and N are much more robust than to the signal cables which also supports my theory. Considering the colours on the cables, white is according to my theory used to Tx/Rx both for W1 and for W2. Although, the blue cables make no sence. 2xN is blue and connected to Vdd on W2 and for the signal cable the blue goes to Vss instead. But maybe they use different color logic for the supply and the signals. Anyone agrees on this theory?