D-90 with SB-900. Had worked fine a few months ago. Today it is underexposing about 3 or 4 stops. Possible a grandkid found a setting.
I tried different modes, new batteries, am using TTL
D-90 exposes correctly without flash attached
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You need to replace your color wheel. This is a very sensitive part and you need to take care when replacing. If you feel comfortable I can walk you through it. If not, I would take it to a authorized service center.
Could be a bad catalytic converter. Have the exhaust back pressure checked. Check the fuel pressure & if possible,drive with the gauge on & see what happens when it dies. If the pressure is good,then it's not fuel. Write back if you have more issues.
I assume that problem is dirt on laser lenses. If you don’t get any result after this, than you can replace receiver with new one. If you want to use your existing speakers with new receiver with integrated amplifier, you must pay attention on wattage, to be same like old one (i.e. 100W), and also resistance (i.e. 4 ohm). If it’s same like old receiver, you should have no problem. Good luck.
Open up the unit and clean the lens using a cotton swab and alcohol. If that does not resolve the problem, try a music CD and report the results here. I suspect that the optics have begun to fail. If that is the case, the music CD will play but a DVD will not. The optics assembly is available (part # RAF3023A-1) for about $60.
Series of images is the KEY. If the Power you set the SB-600 is HIGH it will take a LONGER time to recycle than the SB-800. If you try to take a photo before the SB-600 is ready you will get a dark image. The randomness you get is due to the time between shots. In general try to run remote flashes at a lower power so they recycle faster.
I like the SB-800 because it can take 5 cells. 5 cells can really make a difference in the recycle time (faster) The SB-600 only takes 4 cells so it is slower.