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If the display does not come on, try doing a hard reset on the cpu in the radio before you throw in the towel. I used to see a lot of these in my earlier years where the radio had sat for a long time unused and would either show garbage on the display or act like it's brain dead.
"R-2000 – Disconnect the power cable with the power switch ON. Remove the
receiver top cover ( 8 screws). Ground pin 40 of the IC-12 on the PLL unit for
about 5 seconds. Reconnect power, keep the M.IN switch depressed and ground
pin 29 of IC-12 for a few seconds. Remove and then reinsert the power cable."
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