Z motors OK but X,Y not moving

[kslee]

I am doing run test after assembly of acrylil i3.
Z motors works well under Repetier Host manual control, but X,Y not moving, no humming.
And found that ,with oscilloscope, no x y step pulses come out from mega 2560.
Z has good pulses from 2560 board.
What shall I do ? Is there something missed?

[zhangxueyou]

Are x and y motor drivers plugged correctly? Are all the jumper caps plugged under motor drivers?

[kslee]

Hi
Thanks for your reply.
All drivers boards and jumpers are correctly plugged.
I installed again the firmware ( ramps1.4 i3) which you sent by email, But no difference.
Foundings:
When repetier host newly connected, LCD display show origin value as x 0 , y 0 ,z 000.00.
Then I moved x by +10mm under manual control, but no moving ,and display show as x 10 and new message appeared
"endstops hit "
I wonder if host understood command as - direction move agaist origin or + direction move beyond max endstop.
any suggestion?

[zhangxueyou]

Try this firmware.

PI3B-ramps.rar

(229.7 KiB) Downloaded 480 times

[kslee]

Problem was solved.
1. Found A0-A7 pin connectors , between Ramp 1.4 board and mega 2560 board, was NOT CONNECTED.
Female connector at 2560 board was bent a little so not matched together.
All x, y motor control signal comes through A0-A7 .

2. Found that only x axis max endstop signal pin has low level while the others y,z, are high.
I looked through the firmware source but can't find why .
When I tried to move X motor, it never move and display tells "endstop hit "
This problem was solved by inverting the logic of max end stop of X in the firmware.

[zhangxueyou]

1. You can manually straighten the bent pins.
2. Did you connect the endstop correctly?

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