Debugging_Integral_Counter
The integral counter did not work reliably, so I took it apart and plugged the modules individually into their connectors. The machine will operate without the time counter connected.
The faults were :
Dirty contacts on some of the modules, so that carry form that module to the next didn't occur.
One module was misadjusted and didn't count cleanly
A cracked track on the printer baseboard meaning the lowest 2 data driver boards didn't get the +18V supply. That caused some interesting problems with modules miscounting.
Debugging_Integral_Counter
The integral counter did not work reliably, so I took it apart and plugged the modules individually into their connectors. The machine will operate without the time counter connected.
The faults were :
Dirty contacts on some of the modules, so that carry form that module to the next didn't occur.
One module was misadjusted and didn't count cleanly
A cracked track on the printer baseboard meaning the lowest 2 data driver boards didn't get the +18V supply. That caused some interesting problems with modules miscounting.