After you have removed a plethora of screws you will be looking at the circuit boards. On the upper left is the Power board which feeds the ESD metal encased board(s) on the bottom. Look for the fuse on the power board on the upper left side of the case. Be careful when the cover is off that you don't break the display bezel.
Hope this helps.
Wish I could get the scematic for this unit...it would make life much easier.
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It may be that the water shorted out the battery, and draining a rechargeable totally is a sure way to kill it. If the battery was a couple of AA NiMH, and the radio was well dried out, i would say replace them and see if it works. As it is it looks like proper service people should look at it.
Sony radios of this era had notorious capacitor problems.... also several other brands were affected. These capacitors were underrated and the technology to make them was not at it's best back then. The cure is to replace the capacitors on the board with new electrolytics. About 28 of them need to be replaced but the big problem is to find someone to do this. the original capacitors are surface mount and must be removed and new radial lead caps put in their place, some are rather tough to get at and the new ones have to be placed carefully. My SONY ICF-SW7600 now works as new and maybe even better! I have done this myself as I have skills working with surface mount capacitors. I offer my services to those who cannot find service for their radios. Please email me for details, I am not into making bucks on this, I just want to see these radios kept working and bringing enjoyment to their owners. Good DXing Rod KB8DNS
If you need to get your out of waranty radio fixed, here is the place, They do a flat rate exchange if you havent opened it up. You call with the VIN and mileage and radio PN and they give you a shipping tag. If it unopened they will give you a flat rate exchange, otherwise they fix yours and it takes a week or so,
Customer Service & Repair
To speak with a RSI Customer Service Representative call 1-502-267-6768 or toll free at 1-877-655-9421. Monday through Friday 9 AM
My wr-100 came with a special note inserted with the instructions that the WR-100 was programmed to not give off an audible alert on tests. This is to supposedly protect you from thinking you have a real emergency.
Mine is new. Maybe the older ones had an audible test alert. I assume yours gave an alert at one time??