Looking for Metex 4500 multimeter schematic/manuals

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Decided to bring my 22 year old Metex 4500H out of retirement. Has been working great, then stored on the shelf for few years (battery taken out). Now doesn't give any signs of life when swithed on. Would appreciate if someone could point me to service documentation of any kind.

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In the end it works fine, more info and pics at http://mjlorton.com/forum/index.php?topic=170.msg1806#msg1806