Why does the M7E self-propelled gun not respond to the STOP button?
SAU-M7E - level control device. It works to empty the tank. Two levels are involved. In automatic mode, it works fine. Using the buttons on the self-propelled gun body I turn on the manual mode, it works, but the STOP command does not occur, although the LED indicates that the STOP has occurred. It is disconnected only with a key. I enclose the scheme, I ask for help.
Has it always been this way or started recently? If always, it may be worth checking which operating mode is set (page 34 in the instructions), and also the keyboard operating mode (page 35). You also need to check the connection circuit of the executive circuits.
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