13 MAINTENANCE

■Opening the transceiver’s case

Follow the case opening procedures shown here when you want to replace the clock backup battery or internal fuse.

CAUTION!: DISCONNECT the AC power cable

from the transceiver before performing any work on the transceiver. Otherwise, there is danger of elec- tric shock and/or equipment damage.

CAUTION!: The transceiver weighs approx. 24 kg (53 lb). Always have two people available to lift or turn over the transceiver.

q Remove the rack mounting handle from both side. See p. 2-3 for rack mounting handle detachment details.

w Remove the 8 screws from the top of the transceiver and the 6 screws from the sides, then lift up the top cover.

e Turn the transceiver upside-down.

CAUTION: NEVER HOLD THE MAIN DIAL OR

ANY OTHER KNOBS when the transceiver is being turned upside down. This may damage the

transceiver.

r Remove 7 screws from the bottom, then lift up the bottom cover.

■Clock backup battery replacement

The IC-7700 has a lithium backup battery (CR2032) inside for clock and timer functions. The usual life of the backup battery is approximately 2 years.

When the backup battery is discharged, the transceiver transmits and receives normally but cannot retain the current time.

WARNING: DISCONNECT the AC power cable from the AC outlet before removing the transceiver’s cover.

q Remove the top cover as shown above.

w Replace the clock backup battery, located on the front panel as illustrated at left.

• Make sure the battery polarity is correct.

e Return the top cover to the original position.

r Set the date and time in time set mode. (p. 11-2)

13-6