I haven't use my unit in over 3 to 4 years. The unit charges up and the ready lamp comes on. But after a few seconds, the ready lamp starts to blink off and on. Is the ready lamp suppose to stay on solid or is it suppose to blink.
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The energy for the very short, very high brightness flash is held in the flash capacitor of the photo flash lamp. This capacitor degrades if is not charged for long (years), and needs formatting, which is a slow charging and 2-3 consecutive shots. Sometime the first charging takes significantly longer than normal time, even minutes. If however the ready lamp does not come up even after some minutes, the flash lamp may have developed an internal fault, which can only fixed by a trained repairman. Another common culprit is wrong contact in the battery compartment. Batteries left in the flash for long often leak, and corrode the contact springs and leaves. These can be cleaned with soaked with vinegar cotton tabs (ear cleaning buds), followed by mechanical cleaning with pencil eraser.
The 283 and 285 require an adapter to hold the 4 AA batteries. This is because there is an available battery pack NC-3 (NiCad) that works with the Charge-15 rapid charger. Loose AA batteries cannot be used without the adapter known as AP-1. They are all over eBay and quite reasonably priced.
Flashes stored a long time often suffer from capacitor failure. The first thing to try however is leave the batteries in for a few minutes powered on to see if they will charge. If this doesn't work, then they'll need professional repair.
the nikon D80 has a 250 volts safe range and i have the same issue but readin on the internet i learned that yo can now the voltage of your flash with a voltage metter ond the hot soe.
Vivitar 283 has diferent ranges of voltages depending on the year of fabrication so older ones can achieve 300 volts and earlier have 230 volts so the best is to get a vivitar 285hv for about 75dollars or a safe sync for about 55dollars, you can find all on ebay or other brouser the safe sync converts up to 400 volts to a safe 6 volts that are yust the normal voltage for digital flashes.
if it is a Japanese 283, CAREFUL, you are working with ~300V
remove the sensor from the front. Short out the terminals at 7 o'clock and 11 o'clock with eg a paper clip, and then charge up the flash . Short the centre terminal with the one at 7 o'clock. If the flash fires, then it probably needs a replacement hot shoe from ebay. If it doesn't, it is a simple job to fix for an electronics worker. Manuals are available on ebay.
I repeat, careful with the Japanese flashes, you will have ~300 volts near you fingers, so if you are less than 100% confident that you won't blow the top of a finger (or worse), get an electronics worker to look at it.
Don't use the ebay hot shoes on a 300 volt flash, you will have the 300 volts out in the open and ready to bite you - have a look how well hidden the second contact is on the Vivitar plastic hot shoe.
the Feral Photographer
The Vivitar 283 was manufactured in China & Japan over a number of years & the specifications did change over this period.
The older Vivitar flashes had a voltage on the shoe which could reach 150 volts whilst the later ones had voltages of only 5 to 9 volts.
If you have, or can get hold of, a small voltmeter then you can measure this voltage.
Turn on your flash & let the unit charge up to 'ready' & connect the meter between the contact in the centre of the shoe & the little contact tucked away in the lip of the shoe. (DC volts not AC) There is no danger to you in doing this!
This should tell the voltage on the shoe of your unit & if it is 15 volts or less, it will be fine with your digital Nikon camera. If more than 15 volts than best not to use it.
Please check the trigger voltage. What, how do I do that, you said!!!!!!!!!?
Here they are:
1. Four fully charged or new batteries into 283. 2. You needs a DVM (Digital Volt Multimeter). 3. Set DVM: DC scale, higher than 10 scale. 4. Black Lead to black DVM and Red Lead to red DVM. 5. Turn ON the Vivitar 283 and wait until light turns Green. 6. Place Black Lead to Outside Silver Contact of the flash. 7. Place Red Lead to Center Silver Contact of the flash. 8. What is the voltage reading? Read the max. V. 9. Anything under 8VDC will be fine. 10. Some versions will be high.