Solved issue with line space latch, but still spacing repeatedly

FOUND DEFINITIVE SIGNAL PROOF OF CAUSE OF LATCH ACTIVATING

The turn-on conditions are when an XIO Control command is being issued by the user for the device at area 6, which is the 1132 printer, at time T6 of a memory cycle, with the U register (saving the Input Output Control Command IOCC) has bit 15 set on. This is how a programmer requests to space down one line. 

No instructions were being executed, but the line +Printer Control Mode was logically high, thus anytime U Reg bit 15 was on, it would trigger a space. The logic gates that combine XIO Control, Area 6 and T6 were working correctly and the signal from them was a logic low, not high.

I then discovered that the trace connecting the card at K2 that produces the +Printer Control Mode signal was not connected to the other gates which use this signal. Disconnected in SLT often means it appears to be a logic high (1). I used wirewrap to complete the connection and the line space latch was no longer an issue. 

STILL HAVING CARRIAGE SPACE AND REPEATED SPACE RESPONSE INTERRUPTS

There is more wrong in the controller logic, as it was still moving the carriage and the controller was triggering a request for interrupt level 1 with the bits indicating carriage space response (completed) and carriage busy. WHen I get back to the shop I will track down these issues, resolve, and continue testing until the controller can handle the printer properly.