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Hi Marc,
The printer hasn't  seen life after mod... I haven't made connections to the board yet, as I'd hoped for some validation first so as not to need rework.
Mark Lerman provided me with a pre-programmed board, so I haven't been involved with firmware.
Good luck with your endeavor.
Thanks,
Roger

 

Hi Roger

 

I’ approximately 300 miles away from my printer :- (( cannot check the wiring again for a while. I won’t be able to hack again my Lexmark before 2 or 3 weeks (well… If my boss lets me go :- / )

 

Did you also check the different “software switches” when burning your firmware in your Attiny ? I think mine was faulty.

 

Without a correct timing, would the laser be running ? I really don’t know. Only Mark could answer these questions.

 

73’

Marc

 

 

 

De : Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Envoyé : samedi 4 avril 2015 06:01
À : Homebrew_PCBs@yahoogroups.com
Objet : Re: [Homebrew_PCBs] Re: DLP MCU version troubleshooting, help needed

 

 

Hi Marc & Mark,
I saw Marc's question marks on the same couple of wires I need some clarification on. I haven't seen any resolution yet, and wonder if these wires should  be cut back to the connectors, left floating, or something else I am missing?
Below is my hookup chart. Is there anything that is incorrect, or needs adding?

MCU Board Hookup
Device	Function	Conn	Color	ATtiny13 MCU	Function
Operator Panel	3.3V	J5-5	BL	2	Pad no.’s = Pin no.’s	PB3
Cover Open Switch Wires	5V	J7-1	YE	8	VCC
5V	J7-2	RD
GND	J7-3	BK	4	GND
New Paper In Sensor (was narrow sensor)	0-5V	J14-1	RD	(Splice Sensor wire to J14 wire)
5V	J14-2	BL	5	4.99k to PAD 8 VCC	MOSI
GND	J14-3	BK	4		GND
Manual Feed Paper Sensor	5V (1.1V)	J23-1	BL	N/C
5V	J23-2	WT	6	MISO
GND	J23-3	BK	4	GND
Exit Sensor	5V (>0V)	J27-4	BL	N/C
5V	J27-5	WT	3	PB4
GND	J27-6	BK	4	GND

Thanks for any assistance,
Roger

On 2/6/2015 5:46 AM, Marc.olanie@... [Homebrew_PCBs] wrote:

 

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 ?

 

------------

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

----------------

J9  : intact/untouched

 J10 empty

 J11 empty

J14 : black =>gnd MCU, white=>pin 7 MCU, red =>NPIS Vcc

 J12 : shunt with resistor

---------------

 

J502 : intact/untouched

 J17 : intact/untouched

 J501 : intact/untouched

---------------

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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