Author Topic: EME-150A at 670 rpm  (Read 291 times)

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Offline papichapo

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EME-150A at 670 rpm
« on: 13:34, 22 March 21 »
Hi all,
last summer, after almost 10 years, I've unpacked my old DDI-1 and plugged it to my 464. After having changed the belt, it was all okay  :D
Last week, I've made the same test but the noise motor was louder than expected.
After some investigations, I've found the motor was running at 670 rpm  :(
On the PCB, the VR201 cannot reduce this speed (just 1/2 rotation allowed).
Any clue ?

Offline tjohnson

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Re: EME-150A at 670 rpm
« Reply #1 on: 16:53, 22 March 21 »
normally there is a pot on the motor to adjust the speed.

Offline papichapo

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Re: EME-150A at 670 rpm
« Reply #2 on: 17:19, 22 March 21 »
No, I as said, on this model, the only way to adjust motor speed is by the way of a PCB pot, not on the motor.
And the tune is limited to 1/2 round, not enough to divide the speed limit by 2...
« Last Edit: 17:21, 22 March 21 by papichapo »

Offline Bryce

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Re: EME-150A at 670 rpm
« Reply #3 on: 17:46, 22 March 21 »
If the speed is anything above 350rpm, then it's not the pot that needs to be adjusted. It's usually a dry joint somewhere else on the PCB.

Bryce.

Offline papichapo

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Re: EME-150A at 670 rpm
« Reply #4 on: 20:06, 22 March 21 »
Does someone known what are current values am I supposed to find on the 4 wires solded to the motor : red, orange, yellow and brown... and of course where to check between...
The plug connecting to the PCB shows me correct values : I've 12 V (red wire) and 5 V (orange one).
« Last Edit: 20:32, 22 March 21 by papichapo »

Offline Bryce

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Re: EME-150A at 670 rpm
« Reply #5 on: 21:19, 22 March 21 »
The motor is a stepper motor, there won't be any stable voltage on any of the pins. It gets square waves sent to it from a driver IC.

Bryce.

Offline tjohnson

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Re: EME-150A at 670 rpm
« Reply #6 on: 12:08, 23 March 21 »
No, I as said, on this model, the only way to adjust motor speed is by the way of a PCB pot, not on the motor.
Actually just to be rather pedantic you didn't say that, you said "On the PCB, the VR201 cannot reduce this speed (just 1/2 rotation allowed)" you didn't mention the motor...
« Last Edit: 13:35, 23 March 21 by tjohnson »

Offline papichapo

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Re: EME-150A at 670 rpm
« Reply #7 on: 15:07, 23 March 21 »
My apology, but I thought that giving the exact model of the drive in the topic title would have been enough to be understood...
« Last Edit: 15:20, 23 March 21 by papichapo »