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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.
Raise the tiltable head the number is embossed below it(at chin side).Near hinge. That means if you tilt flash head fully upward the number is exactly at the opposite side of Flash power calculator dial(Two inch round chart).
Check the polarity of the batteries. With the batteries removed you will be able to see small + and - alongside each of the six connectors. Make sure the + of the battery connects with the + connector. Similarly check the - connections. With the batteries inserted (but without the plastic cap being fitted) you should see the ends of the batteries. Three positive ends (all in a row) and three negative ends. If one, or more, has been inserted with the polarity reversed it will stop the flash from working. It can also cause the handle to overheat.
Metz in Germany advises Models CT45-1 with Serial No's 53400 or less have High Voltage triggers and must not be used on NIKON Digital Cameras Models D70 ,D80, D90 etc.and will damage Flash and even Cameras. according to a email received today. 21/09/2009 Models CT45-4 and 45CL -4 ore ok.
Michael T
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.
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