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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.
I have a lot of old 45-40 Series Metz 45 NiCd battery packs, that I will eventually rebuild with new NiCd batteries. I got them from Photographic Trader magazine and from ebay. I've heard that NiCd cells are going out of production, in favour of NiMH cells. I've found it's easier to put NiCd or NiMH cells in the alkaline battery holder, the flash recycle time is only slightly longer. I charge them separately out of the holder, or in the holder with a connector I made. NiMH cells need a suitable charger, with peak detection, as NiMH cells don't like being overcharged.
Metz 45-40 consist of 6 nos of NiCd - AA size batteries connected in series.
These battery packs can be rechanged by resoldering new set of AA size rechargable Nicd battries.
Care should be taken not to short circuit the cells when disassembling and assembling the cells.
Keep a note (sketch) of the connections of the cells, specially the longer connecting metal strip and the polarities of cells.
re-solder the new set of AA size NiCd Batteries.
If the old wires were corroded, use new wires'
If the connecting terminals also corroded' clean it.
If it is severely corroded, get it plated prior to fixing for better performance..
There is an charging indicating lamp which also control the charging current of the batteries.
check its connections and solder it if required.
I wish you got the answer for your problem.
Cleaning is unlikely to cure your problem.
To change the cells follow these instructions, taking care not to short circuit any of the cells.
You need to know how to use a soldering Iron.
You need to understand basic electrical principals.
Stand the battery on the part with the charge socket at the bottom, the plastic at the top is held in place by a series of plastic latches.
Look closely to see them.
Release these latches CAREFULLY one by one with awatchmakers screwdriver, until the cover can be removed.
This will enable you to see a single, roughly central crosshead screw.
Remove this screw.
Unsolder the contacts at the top.
Separate the top and bottom parts gently, whilst feeding the now unsoldered wires into the assembly until you can see the lower soldered contacts on the cell units.
Unsolder these two contacts, and separate the top and bottom parts completely.
Withdraw the six cell units together, and hol them together with an elastic band.examine closely and note the long metal strip which is required to pass over a seperator in the housing.
Note also the transparent rings around the positive contacts on the cells, recover an re use these.
Purchase either solder tagged NiCads and solder them yourself, or get a battery supplier to replicate the complete six cell unit. (30 bucks here in France).
DO NOT try to solder cells without solder tags. Battery replacement stores are equipped with micro spot welding equipment to connect these.
In either case it is MUCH easier to reassemble the battery pack using the upper housing to keep the cells in place whilst soldering or welding.
Rebuild the unit.
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 charger adapter that plugs into the battery pac from the wall has a fuse inside it open it uo and check the fuse has not blown as that'snormally the reason i get no light on the pac also using a small enough file clean off all the terminals and check that the spring terminals contacting the circuit board from the plug are not corroded and contacting correctly