Icom IC-7800 Instruction Manual - Page 178
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I Fuse replacement MAINTENANCE 13 When no external DC output is available from [EXT DC] and ACC connectors, the internal fuse may be open. Replace the fuse in this case. WARNING: DISCONNECT the AC power cable from the AC outlet before removing the transceiver's cover. q Remove the bottom cover as shown left. w Replace the open fuse with a new, properly rated one (FGB 2 A) as shown at left. e Replace the bottom cover. I Resetting the CPU [POWER] [MW] [F-INP•ENT] q Turn the main power switch on the rear panel ON. • Make sure the transceiver power is still OFF. w While pushing and holding [F-INP•ENT] and [MW], push [POWER] to turn power ON. • The internal CPU is reset. • The CPU start-up takes approx. 5 sec. • The transceiver displays its initial VFO frequencies when resetting is complete. e Correct the set mode settings after resetting, if desired. NOTE: Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values. ALL CLEAR 13-7