Finally I have found a replacement chip for CS5389 AD-converter in my PCM80 reverb. Lexicon worked from digital-input but analog inputs were silent. I once ordered CS5389-chip with eBay from China but that never arrived to Finland. Now I tried creative_dynamo from eBay and this was a success. I ordered direct replacement chip CS5390 from creative_dynamo UK. After I had checked the voltages and replaced the old 89-chip with 90 one everything worked as supposed.
Now my PCM80 is back in business. Thanks creative_dynamo!