Have it serviced, or sell it. The culprit of this malfunction is either a faulty quench capacitor, of high capacitance and voltage, but small physical size, or a thyristor. Both are made of "unobtainium", can only be cannibalized from organ donors.
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Unfortunately, from your description, the flash is completely done for - while a repair may be possible, I doubt if it would be economically worthwhile. Replacement is probably the only answer.
What may be more important is to find out why this occurred - is it down to the charger, the batteries or an internal problem with the flash ? Were the batteries those supplied by Metz, or a different make ? If they were Metz ones, then maybe you should inform the manufacturers, to help others avoid this problem, and you might get a replacement flash if it is a manufacturing problem.
If your Metz is for Nikon it will not work in TTL on Cannons. Metz makes different flashes for Nikon and Cannon. I have a Metz 54 that I use with my Nikon D200 and it works as well or better than the NIkon SB800 in TTL.
During the flash impulse the "photocell", actually a phototransistor, charges a capacitor with current, proportional to the reflected light intensity. As soon as the voltage on that capacitor reaches the trigger voltage of a four-layer diode (which, in fact, is playing a role of a PUT) that turns on and triggers the quench thyristor. There is a trimmer potentiometer in the four-layer diode circuitry, which sets the trigger voltage. You can try to fiddling with that. But the culprit of the misalignment easily can be in any of the parts in the above described circuitry.
You may have to install new batteries, a few times. The Capacitor will **** the life out of the batteries as it builds up its charge. I have a Hasselblad D-Flash 40 this happened to. Bought as Mint. Not used in over 1 year. When I received it, I was absolutely pissed that I bought more ebay junk. But, I persisted. I think I went through 30 batteries, before the Capacitor rejuvenated itself. Try. Best of luck.
I have a circuit diagram for the 45CT-5 and the flash unit as well. The voltage is 360V DC, which goes straight across the flash tube. The top pin is positive, when the notch in the socket is on the right hand side, i.e. towards the back of the flash.
I'm also looking for a circuit diagram for a 45CL-4, if you know anyone who has one.
The trigger voltage of the 45CL-1 is about 12V, so it should be safe to connect directly to the hot shoe with an adaptor, or to the pc soclet, if the D90 has one. If the D90 is anything like my Canon 40D, which can stand about 30V on the hot shoe, then all the 45CL series will be ok, as they have trigger voltages between 9V and 12V. The 45CT-5 has a trigger voltage of 15V and works well on the 40D. I use 3 different Metz 45 models with my 40D and all work well on automatic, where the flash sensor itself controls the light output.
Originally the 45CT1 had high trigger voltage. In the production period Metz improved it to a much lower voltage release circuit. Metz homepage (metz.de) holds the information, from which serial number on have 45-CT1s low trigger voltage. However, even the high trigger voltage was lower than 200 volts, thus safe for your Fuji. Laszlo