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Topic: Sankyo 600 projector motor problem
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted September 25, 2010 09:57 PM
The thing you need to be on the watch for is the possibility that it could be something simple, like an open connection between the speed control circuit and the motor. Years and years of oxidation and vibration just may have caused some connection or conductor to be open circuited.
If you can get in there with some sort of voltage indicator (meter, test light, etc.) and look at the output of the control circuit, you can see if you're getting voltage or not. If you are then you check the voltage at the motor. If you have no voltage at the control, your control is dead. If you have good voltage at the motor, your motor is dead. If you have good voltage at the control and nothing at the motor it's probably the wiring in between.
Sometimes a little cleaning, tightening or soldering will set everything right again.
It could be some big problem too, it's just best to check out the easy fixes first rather than send a machine to the shelf.
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All I ask is a wide screen and a projector to light her by...
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Phil Mitchell
Expert Film Handler
Posts: 144
From: Melbourne, Australia
Registered: Aug 2013
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posted August 12, 2014 10:50 PM
Hi Paul, sorry I have not replied since June, time flies when busy at work etc.
In regards to the motor control board, do you happen to know which board that is?
There are two smaller boards as you look from the back, one is in top right hand corner, it has the two grey capacitors on it, this board controls the speed etc of the motor I believe. There is a hidden small one behind main Power Board, where those miro switches are. Thanks Phil
What I have discovered since is switches are fine, but wiring to them and the small board had come loose and needs replacing which I am doing.
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Phil Mitchell
Expert Film Handler
Posts: 144
From: Melbourne, Australia
Registered: Aug 2013
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posted August 12, 2014 11:22 PM
Hi Janice how are you.
Yes stil at it, I'm not replacing any boards at the moment, I was interested in which one was the motor control board but since I posted I thought about it and I suspect it is the top right hand one, as you may remember you advised me awhile back on how to adjust the speed of this projector by using the pots which are on that board, so one assumes from that it is the motor control board.
What I am doing is replacing the wiring from the switches to the smaller board that sits behind them, as wiring came off once I moved that board, luckly I took pictures as I did it so I know what goes where.
I got 2 new switches but they may be spares as it seems Micro switches are okay, I am reading up the thread where other people gave you instructions on how to use multimeter, as I need to understand that more. As I do have one switch wired up just okay and do get a milleamp reading of 0.81 from it and also from it's common Terminal when I have switch's plunger pushed in. ( That is how these switches make motor run forward or back.) which is what goes to small board and then to motor.
My brother suggested instead of soldering, I put new wires onto terminals to connect to switches, there is room above where switches sit in projector for them, good idea, as they are a bugger to solder. Wiring is only 1.5mm
It's a interesting set up.
You have the red power wire coming from the larger board where speed control is and that goes to a blade of one switch and then you have to run a shorter wire from there to give other switch power and same applies to negative black wire, although that runs from board to board first and then you have for middle blade white wire coming from small board or blue wire depending which switch.
Does that make any sense?
Cheers
Phil
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Phil Mitchell
Expert Film Handler
Posts: 144
From: Melbourne, Australia
Registered: Aug 2013
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posted August 15, 2014 03:08 AM
Hi guys,
Paul yes I suspect you may, the guy in NSW is someone who sells parts and swaps for cleaning stuff, they’re are in Dubbo.
Camera check point.
Now my testing today has I think May of found culprit board.
Multimeter set to 200 DC Volts, I get 3.6volts from switches power terminal and neg or from white or blue wire for common, which are wires that go to motor. Now 3.6volts will not be enough to drive motor, a 9volt battery can only just do it.
Same reading when I test the small PCB where blue and white wire terminals connect from motor, 3.6. So one can assume switches and my soldering today is okay.
Now here comes where I feel issue is the red positive and negative wires that run from speed control board let’s call it, the top right hand one with a grey I think it is a capacitor has 63volts written on it. Those wires also give me 3.6volts.
Now wires going to and from this board blue and white which I gather are output for speed control switch below etc is 0.08v but there is a 2nd blue wire going to this board which I assume is power for it and I get 17.1 volts from it.
Pete do you have this board?
I’ve posted an image of it below.
Guys does the above make sense and sound right?
I will take board out tomorrow and check for bad solder etc, I did have a brief look at first investigation. But will look more carefully this time.
Thanks in advance
Phil
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