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How to control Stepper Motor with Integrated Controller, with Arduino Answered

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I salvaged a few big stepper motors from a large Laser printer. Unfortunately they all have integrated controller boards. I would like to control them with an arduino. I am aware that an option is to remove the PCB then use a regular contoller. I would prefer to use the integrated board. The boards have the following inputs:
24V
GND
P/S
LD
CLK
+5
GND
The high and low voltage and ground are obvious. CLK is the clock speed (which I half understand). LD is Load?? P/S is pulse??
The board has an SLA6024 with a nice heatsink. (perhaps that helps.
I am after a wiring diagram and arduino sketch to control the motor for a CNC machine.
Your help is appreciated.
Attached are a few images.



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craigevert (author)2011-06-19

There is a lb1923 on the reverse side of the pcb. The IC spec is at
http://www.chipcatalog.com/Cat/Brushless_Motor_Drivers.htm
Looks like a 3 phase brushless motor driver.
Apparently it uses hall sensors and has a braking option.
I read the spec and looked at a sample application diagram but have no idea what signal to send to the board.

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steveastrouk (author)craigevert2011-06-20

Find out where pins 5.6,7 and 8 are going from the IC to the ourside world..
I suspect pin 7 is tied down on the board, but I may be wrong
Steve

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wasteoinc (author)steveastrouk2013-06-02

Hi steveastrouk. It seems there are many motors like this one on laser printers. I got a couple and Im wondering how to control them.

what kind of input do I need to give on those pins?
f/r is forward reverse control
s/s is start stop
and clock sets the speed. so what kind of signals do i need to give them??

as I understand this motor is brushless so unsuitable for cnc as the original author had in mind

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steveastrouk (author)2011-06-18

From the chip description, those chips aren't doing the work, they are the power drivers for the coils in the motors. Any sign of any other silicon ? Maybe its flip-chip and buried under a black blob ?

Steve

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AlexanderZ (author)steveastrouk2011-09-04

I have a similar motor and it does have the Stepper driver, just that the name is not legible [ so I cant get the data sheet to control it]. here are some pics, I think His stepper comes with an IC too.

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steveastrouk (author)AlexanderZ2011-09-05

AH ! The diamond shape is probably the drive chip then.

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rdsouza2 (author)2011-06-22

Do you have manual book for stepper motor? You can follow that ,if you have a problem. Otherwise contact the experts who have good knowledge in this field.
Stepper Motor

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