Hi Mark
I triple checked all the wiring (see below)
Next step : I'll try to change the processor board
Do you have an idea on how to check the laser beam ?
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Wiring after mod : check list of connectors
J4 : intact/untouched
J5 : intact/untouched (“X” button routed directly with a wire going from front panel to =>pin 2 MCU)
J100 : intact/untouched
J7 : To MCU (black => gnd MCU, red => pin8 MCU(Vcc), yellow => Vcc, shorted to red)
J8 : intact/untouched
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J9 : intact/untouched
J10 empty
J11 empty
J14 : black =>gnd MCU, white=>pin 7 MCU, red =>NPIS Vcc
J12 : shunt with resistor
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J502 : intact/untouched
J17 : intact/untouched
J501 : intact/untouched
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J28 : empty (unused tray selector)
J27 : black=>gnd MCU white=>pin 3 MCU, Red-white-black : cut, blue=NC ????
J26 : empty
J25 : intact/untouched
J23 : black=> white=> pin 6 MCU, blue=NC ????
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check list of NPIS :
NPIS=> MCU Pin5
NPIS =>Vcc J14
NPIS => MCU gnd
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check list of connectors MCU :
Pin 1 =>ISP reset
Pin 2 =>X button
Pin3 => J27-5
Pin4 => GND
Pin5 => NPIS collector
Pin6 => J23- white
Pin7 => J14-white (middle)
Pin8 => Vcc
Other connectors are empty or not even soldered.
Marc