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Digging through my junk box today, I unearthed the scanning mirror from a laser printer, otherwise known as the Heart of the LaserJet. So my usual plan of attack does not succeed.
The second step is to examine the single 5-pin connector to see what I could figure out. Pin 3 is obviously ground because an827sb is the only pin connecting to any large ground planes. What I suspect to be pin 5 appears to be the power supply since it connects to two very low valued resistors 0.
Most of the other pins disappear inside the undocumented chip. Digging around in my junk box produced the power supply board for the laser printer. I was able to find the other side of the connector and quickly verify that pin 3 is indeed ground. What I thought was pin 5 is actually pin 1, and it is indeed power. Tracing back through the power board I notice that it connects datasheeet a filter capacitor with a 25V rating. Based on that I conclude that it is very likely a 12V rail.
I soldered some jumper wires onto the board and began experimentation in earnest. Not even anything bad.
They all went into a big microcontroller, but the wiring connections were different. Pin 2 had a 10K pullup to some low voltage supply, pin 4 went straight into the microcontroller, and pin 5 came from an RC filter from the microcontroller. First I tried connecting a 10K pullup resistor to pin 2 on the motor driver board to 3. It was a logic low. I spun the mirror assembly, and I saw pulses!
This must be the tach output.
By rotating the mirror very slowly by hand, I counted 6 pulses per revolution. Next I probed the voltage on the other two pins, which were both weakly pulled up to about 3. I pulled pin 4 low, and the tiny mirror spun up with a whine to about 13, RPM as measured by the tach output!
That was really great because I was worried that those two pins were I2C control lines which would have made reverse engineering a lot more difficult. I tried grounding it through an ammeter and noticed that the current, although it started at a few hundred microamps, tapered off quite rapidly. There must be a capacitor in series somewhere on the motor board, and that means the pin is designed for AC signals.
Since no signal came out of the pin, it must be an input. I connected a function generator at a few kilohertz with a 3. On impulse, I dramatically increased the frequency. Suddenly the motor slowed down and settled at a constant speed. By changing the frequency, I could manipulate the motor speed. So pin 5 is a synchronization input.
The next step was to figure out the relationship of input frequency to output speed, so I connected my trusty old Nixie frequency counter to the output of my function generator and my multimeter set to frequency to the tach output. The ratio appears to be fixed: Drop me a line in the comments if you think you can guess what my idea is, or to post your own ideas, or even if you find this information useful for your own project.
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November 1, 3: Its very interesting i was thinking to use of this motors for demo show helicopter project. Because i have a lot of scanner motor from old laser printers.
I was busy with datasheets and other tips. December 30, 2: I have just dismantled my canon lbp January 8, 5: January 11, The information you have provided is really good. Similarly I opened up a scanner assembly in a Laser Printer and I found there was six connection coming out of it. I datqsheet not identify the connection from the chip TB -F. Could you please try it also and send a mail regarding this chip.
It will be very useful for servicing my printer. July 25, Connector Pin — Chip pin as follows: February 19, 1: Hey we got a strange method to rotate the motor!
April 22, 7: I am looking at using this item for a BORG costume! April 23, 9: I have one of the mirror boards out of a 4P with the TB controller.
I found a doc on a similar chip similar series number and this is OEM so probably related on the Toshiba website. April 27, 9: On the motor board the pin 1 is closest to the right side of the board with the connector at the bottom.
I connected ground to pin three, 12v to pin one and I connected pin 4 to ground to pull it low and the motor spun like a charm. It also spins at lower voltage in as well. One thing i would like to do is proceed the motor. January 17, 7: January 29, I have the same unit, but my interest was on the other side of the box. I was trying to power it up, but no success. Douglas Berlier this motor spins too fast for You, to be able to get a visible, moving dot. I suggest You to use a stepper motor or something, with this square motor.
And make stepper move forward, and back, or just spin one direction, to be able to see a dot moving along the line.
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February 7, 2: April 1, I had a laser head I pulled out of a Sharp I think printer. It also had a 5 pin connection to the motor, but the pin-out was different: The motor will not spin up without the sync signal, and it seems happiest with something around Hz.
Hi, I have the same chip, but on a different board from a different printer. There also is a 5-pin connector, but it definitely has a different pinout.
Only the ANSB is the same. Could you map your input ports to pins on the so it is easier for other people to find out the pinout of their PCBs?
I have almost the same circuit. The same controller but another layout. My pins are from right: I experience that my control pin is not frequency controlled but rather the duty cycle controlled the motor speed.
Using a frequency of 5 or 50 Khz did not change the motor speed. Changing the duty did. Oh, and my guess am8247sb what your project is about is to build an IR-camera. If so, I would like to build one too. Years after, your explanations were very useful to me after dismantling a very old laser printer and trying to powering up the scanner unit.
My mw green laser can now draw a straight line! October 3, February 21, 9: Motor and solenoid power supply voltage in all HP Canon printers is 24V. Service datashedt for the HPLJ gives following description of the scanner motor connector may be different in the model you have: Mail will not be published.
You can use these tags: Comment moderation is enabled and may delay your comment. There is no need to resubmit your comment. Dear Sir The information you have provided is really good. What about chances to use arduino for controlling this motor? You could have found pinout easely from a chip datasheet, which is next to connector. I have the same motor and it doesnt work.