Question about Nikon Speedlight SB-600 TTL Flash

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SB-600 Ready Light Won't Come On When Mounted on D-40X

Got a new SB-600 yesterday. Fired it up with fresh rechargeable NiMH batteries. Got the flash ready light. Attached it to my Nikon D-40X camera. As soon as I powered up the camera, the ready light on the flash as well as in the viewfinder do NOT illuminate, ever. The flash seems to work okay, but while mounted on the camera, the flash ready light never illuminates.

Is there a fix for this, or is this "normal" behavior when coupled with the D-40X?

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Re: SB-600 Ready Light Won't Come On When Mounted on...

Check that all the batteries are functioning properly, and that they have been inserted in the proper direction.

Jerry G

Posted on May 17, 2008

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Bought a Nikon Speedlight SB-600 in August. Tested the flash and it fired ok. I took out the flash a few days ago to use at a graduation and the "ready" light did not come on. Consequently it did...

Hi grwcamp, Sorry to hear about it not working at the graduation. Are in the correct position (I am sure you did but, we must start someplace). Look inside, see if there is battery acid in there.
If with new/fresh batteries it still does not work call Nikon. You have a warranty on it so it should be covered.
Nikon digital 1-800-645-6689

Dec 04, 2010 | Nikon Speedlight SB-600 TTL Flash

1 Answer

I put fresh batteries in my sb 600, i took a few pictures and then the flash was not as powerful and 2 red lights kept flashing on the front, why?

Ok, there are several things to consider. First of all, don't use standard alkaline batteries, the flash needs a lot of power and will drain those quickly. Use either lithium batteries (most powerful non-rechargeable) or invest in NiMH rechargeable batteries. Those would be your best choices for AA's.
Now to your flashing red lights - on the Speedlight flash they fulfill 2 functions, one is as auxiliary ready lights (if used as wireless remote flash) but the blinking in your case points to their other function - it blinks 3 times to indicate possible under exposure of your photos at maximum output level. It's basically telling you that the flash was not strong enough to properly illuminate the scene you tried to shoot. That doesn't necessarily mean the batteries are going flat, but you could simply be out of range of the maximum flash power. Your flash has a guide number of 30 - that means at a zoom head position of 35mm (if your lens is at 35mm) and your ISO is 100, then the maximum range of the flash is 30m (approx. 68ft). If your subject is further away, you would get an underexposure warning (3 blinks of the ready lights).
Hope that helps explain some things.

Jul 29, 2010 | Nikon Speedlight SB-600 TTL Flash

2 Answers

Will not show ready light , batteries complety charged...

Is the flash powering on?
Are the batteries installed correctly?
Try a fresh set of batteries.
If that does not work, you will need to send it in for service.

Jul 09, 2009 | Nikon Speedlight SB-600 TTL Flash

1 Answer

Nikon SB-600

seems like the batteries have gone dead. Replace the batteries. Get a set of good capacity rechargeable NiMH batteries (I recommend Sanyo Eneloop). Also try cleaning the battery and flash contact points with an eraser.

Feb 03, 2009 | Nikon Speedlight SB-600 TTL Flash

2 Answers

Nikon Sb600 does not fire every time

More than likely it is the flasg tube . Be sure to clean the hot shoe assembly foot well .
Berrie Smith Camera Repair

Nov 17, 2008 | Nikon Speedlight SB-600 TTL Flash

1 Answer

SB-600 will never be on ready

The capacitor may be weak, or there is a problem at the component level that is not allowing the inverter to reach full voltage.

The flash will need shop service.

Jerry G.

Apr 20, 2008 | Nikon Speedlight SB-600 TTL Flash

1 Answer

Nikon SB-800 Defect

Have you tried other batteries?

If one cell has died, there will be enough power to power up the flash, but not enough to charge it reasonably fast. It may also stop the other cells charging up properly if they are charged together. I've had this problem with poor quality rechargeables before. I think flashguns put pretty heavy demands on batteries.

Oct 23, 2007 | Nikon Speedlight SB-800 TTL Flash

1 Answer

Fried Unit

Mixing the batteries should not have damaged the flash. More likely the smoke came from the odd battery.

Aug 09, 2006 | Nikon Speedlight SB-800 TTL Flash

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