T-90 problem

<p>Hi.<br>

My canon T90,when i put it in on,the LCD is ok,everything appear,when i pull the shutter half way,in the screen i see the apperture and the speed,but when the shutter is completely pressed,in the LCD the little triangule starte blinking (in single,H or L) and nothing appear in de screen,and the T90 don´t fire.<br>

In the LCD or in the screen i don´t see the EEE EE error.<br>

Any sugestions for this problem?<br>

Thanks in advance to all.</p>

<p>From Wiki on the T90 ( http://en.wikipedia.org/wiki/Canon_T90 )</p>

<blockquote>

<p>Another, more serious, problem concerns the shutter. The T90's shutter appears to become "sticky" as the camera ages. It is prone to locking up, in which case the camera's LCD displays "EEE" and the message "HELP" appears in the viewfinder display. This is commonly called the "EEE syndrome" among users. The problem is most likely to crop up after the camera has been left unused for some time; thus, the best way to prevent it is regular use of the camera. It does not seem to cause inaccurate shutter speeds before failure. The problem can be corrected by a knowledgeable technician without replacing the shutter mechanism. It is reportedly caused by dirt on the shutter's magnets affecting their performance. But if left unused for an extended period of time the circuit will need to be replaced, an expensive and time-consuming proposition.<br /><br />The sticky shutter problem relates to a rubber washer which is involved in the operation of the shutter. With age and atmospheric conditions, it tends to deteriorate and become sticky, so that it impedes the operation of the shutter. Frequent use can delay the stickiness from 'glueing up' the shutter, but once started, the only long-term remedy is to have the shutter repaired, when the rubber washer is replaced, and so another 10 years or more can be enjoyed with the camera working correctly. A good short term solution is to lightly clean the shutter diaphragm with a cotton ball and lighter fluid.</p>

</blockquote>

<p>This doesn't sound like the usual sticky shutter magnet problem, which invariably generates the EEE message (and can sometimes be cured by banging the camera on the floor ...).</p>

<p>Perhaps try pressing the battery check button? This can free them up. I assume you are sure the batteries are OK.</p>

<p> </p>

<p>There are three release magnets in the T90, one for the mirror mechanism and one for each of the two shutter curtains. All three are prone to "stick" when disused.</p>

<p>The mirror release magnet must release first. Then the first curtain magnet releases, then after the proper electronically timed interval, the second curtain magnet releases.</p>

<p>It's been a long time, so my memory isn't entirely clear, but failure of one of these to release causes the flashing arrow in the LCD--I think the mirror magnet. In any case, "EEE" is <em>not</em> the only visible result of a stuck magnet.</p>

<p>Gaining access to the magnets is a huge, painstaking disassembly process suited only for the determined, skilled, and highly capable person in both mechanics and electronics. If you're good enough, you don't necessarily have to be a camera repair specialist, but you must have those qualities.</p>

<p>The simplest plan is to send the camera for a CLA, have the magic done to the three magnets, have the now-gooey rubber bumper replaced, and let the technician clean, adjust, and check over everything else. Just be done with it. Steve Sweringen, Camera Clinic; Reno, Nevada, if you're in the US. I am a delighted customer.</p>

<p>Or do you want to bang your precision T90 on the floor? Somehow this has never seemed to me like a good way to treat a precision instrument. After a while, the magnet is going to stick again anyway. When buying a used T90, always ask the seller how often the magnets have been "fixed" by slamming it on the floor. I'm glad I bought my T90s before the banging became Internet legend.</p>

<p>When I see a speck of dust in my FD 400mm f/2.8L, I grab it by the skinny end and swing it like a baseball bat, into a tree trunk. Oak is better than pine, higher density, more rigid. The sudden deceleration of the lens causes the speck to fly to the edge of the barrel through its own inertia, lodging in the anti-reflective flocking. This is why I prefer the 400mm f/4.5. Its glass has fewer cracks. Along the same lines, if I were a golfer, perhaps a driver applied swiftly to a T90 perched upon a tee would be a good way to repair it. Alas, I own no clubs.</p>

<p>End of hyperbolic comment. No offense meant.</p>

<p>Alan, I totally understand and agree with everything you say and feel a little guilty now about suggesting banging the T90 on the floor. However I would say that there are many thousands of T90's out there, sitting unused at the back of drawers or in cupboards, many of which will give out the EEE message when someone tried to use them. Ideally they would be sent to an expert for repair. But in the digital age these cameras are worth much less than the cost of repair and unless someone is very determined to get one working, and can find a repairer in whatever part of the world they live, and is prepared to pay the cost, they are going to stay broken. Often on the internet, people are advised not to bother getting a camera repaired when it's possible to buy another working one at much lower cost.<br /><br /><br />It's in this context that such crude and potentially damaging solutions emerge, such as banging them on the floor. Something similar happens with the Canon Squeak on A series cameras. This can be cured by injecting a drop of oil via the base of the camera but it's hit and miss, and risks getting oil where it shouldn't go. Strictly speaking they should be stripped down and lubricated professionally, but again at much higher cost than the value of the camera.</p>

<p>I have got three T90's working by banging them on the floor, and three A1's, by injecting oil via the base.</p>

i bang my t90 (sorry that just sounds

wrong lol) into my palm while pressing

the shutter button...no lens attached.

when i say bang i am banging hard

enough into my left palm that my left

hand hurts. usually takes 20 seconds

or less...i wouldnt recommend the floor

no way i am trying to repair a t 90... the

line that comes to mind when i see

Chris Schwartz photos of the t90 guts is

the Dirty Harry "a man's got to know

his limitations"

<p>Have had this repaired on three T90's... Steve at camera clinic in Reno Nevada (Sparks) is an ex Canon employee and has his own clinic now.<br>

Serviced each of my T90's which exhibited EEE errors. Reasonable for repair in my mind at $125. <br />Indicates lack of use is th primary reason for the shutter magnets to become dirty-oxidized-whatever. Response time good. Spoke with him on the phone a few time. I plan to use him again on a T90 with the EEE error.<br>

<br />Lars</p>

<p>I'm with Alan on this one.....I have 2 t90's both working like tanks...and both PRECISION instruments...at 1/4000ths of a second...let me say that again... one four thousands of a second....</p>

<p>And you want to BANG it on ANYTHING???</p>

<p>Send it to Steve...he does good work...lenses too!!</p>