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No power to the regulator? Seems like it should. Is the power supposed to be switched to the reg? Maybe an open circuit trace from unreg V to the input of the 5V regulator? If it runs hot enough for a heat sink maybe a cracked solder joint? Just guessing.
Seems RS scanner schematics are tough to come by. I have a Pro-2050 Trunk Tracker that stopped receiving after a power outage. It appears to be working and scanning but receives zero signals. Never have found a schematic for it. I guess they are still afraid we users will modify them to receive 800 mHz cellular signals, even though analog FM cellular has been obsolete for years!
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