Sony CDX-4250 Operating Instructions (primary manual) - Page 11

Maintenance Fuse replacement When replacing the fuse, be sure to use one matching the amperage rating stated on the original fuse. If the fuse blows, check the power connection and replace the fuse. If the fuse blows again after replacement, there may be an internal malfunction. In such a case, consult your nearest Sony dealer. Dismounting the unit Release key (supplied) µ Fuse (10 A) µ Warning Never use a fuse with an amperage rating exceeding the one supplied with the unit as this could damage the unit. Cleaning the connectors The unit may not function properly if the connectors between the unit and the front panel are not clean. In order to prevent this, open the front panel by pressing (RELEASE), then detach it and clean the connectors with a cotton swab dipped in alcohol. Do not apply too much force. Otherwise, the connectors may be damaged. µ Pull the unit out while the release key is inserted. µ Press the clip inside the front cover with a thin screwdriver, and gently pry the front cover free. Main unit Back of the front panel Notes • For safety, turn off the engine before cleaning the connectors and remove the key from the ignition key switch. • Never touch the connectors directly with your fingers or any metal device. 11