Not certain if your model uses the K Mech/Deck (try searching the net to see if it does) If it do!
F03 means locks when unloading. The cause will be the load motor or drive, timing, or mode switch.
1). U10 Dew formation Wait until the indication disappears. 2). H01 After cylinder lock is detected, the cylinder does not start rotating again even after tape unloading. Check the cylinder-motor drive circuit. 3). H02 Cassette tape is not wound up during tape unloading except Eject mode. Check the capstan-motor drive circuit. 4). F03 Mechanism locks during mode transition except Eject mode. 1. Check the loading-motor drive circuit. 2. Check the mechanism phase alignment. 3. Check the Mode Switch. 5). F04 Mechanism lock during tape unloading. 1. Check the loading-motor driveї circuit. 2. Check the mechanism phase alignment. 6). F05 Cassette tape is not wound up during tape unloading in Eject mode. 1. Check the capstan-motor drive circuit. 2. Check the Supply/Take-up reel pulse. 7). F06 Mechanism locks after tape unloading in Eject mode. 1. Check the loading-motor drive circuit. 2. Check the mechanism phase alignment for Cassette Holder Unit. 8). F09 No serial clock transmission between IC6001 and IC7501. Check the serial clock circuit.
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September 2009