LCD and error codes

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LCD and error codes

k7btw
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I'm up to page 36 in the K1 manual,  Alignment and Test, Part 1.  All resistance and voltage checks fine up to this point.  When power turned on, I do not get the E27 error code.  The LCD is blank, except for a few vertical bars on the top half of the display. If I press a switch, they go away and the LCD is blank.  I've done all the usual kinds of inspections, including going back over the instructions step by step. I could use some suggestions.  Thanks.