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Author
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Topic: Projector raised from the dead thanks to electronics 101 crash course
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Pablo Alvarez Roth
Expert Film Handler
Posts: 129
From: Chile
Registered: Aug 2006
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posted February 01, 2007 08:39 PM
Hi everyone, I am very happy to say I fixed my chinon sp350 from a 3 week death bed.
A few weeks ago my projector suddenly stopped, and a dastard cigarette burn on my carrie flick.
So I opend it, checked the motor belt, fuses everything and no an idea of what made the motor stop.
Hmm puzzled, I took it to 4 tv and vcr repair shops and none would accept it, I new the jam was electricronic related, but what? I only know the simple stuff, not much about circuits trasnsistors etc.
One tecnition told after he checked it out for half an hour that the transformer was burned, and the switches faulty, so I took it to a transformer repair shop thay had it for a week, and told me the transformer was fine (wierd) and bought new 3 pin switches changed them and still no luck.
So I decided to learn about electronics and circuit boards myself. bought a meter, and started to pull the projector apart to read the board.
So thanks to the internet and my dad who lives in australia who had great patience and slowly through many web conferences (I am in chile on the other side of the world) learnt simple electonics, I felt like an open heart sergeon operating with help via video confrence jajaja, and learnt how the voltage comes though the transformer, gets to the board, goes though a bridge rectifier and turns the current to DC, the goes though many transistors, resistors, regulators others etc till it gets to the motor, but it lost the current somewhere on the way.
After many nights testing the circuits and components, with dad helping me in video webcam conference, testing the components with my meter, till I got to a transistor called D837 (voltage regulator really) that acted weird, so I decided to look for one, no luck so I got a substitute Tip122, got home and tested it and whala!! 14 volts dc in the meter, this must be it I said!!, So I rebuilt the projector and success!!! it runs.
Everything runs perfect, and I even had the time to clean it thoroughly and grease up the gears etc. and now I have my old projector like new running like a pussycat again,
What a success story, and it was real fun learning how the projector works, and a bit of electronics.
Cheers
Pablo
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