Opening The Transceiver's Case; Clock Backup Battery Replacement - Icom ic-7700 Instruction Manual

13
MAINTENANCE

■ Opening the transceiver's case

■ Clock backup battery replacement

Follow the case opening procedures shown here
when you want to replace the clock backup battery or
internal fuse.
RWARNING! 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 approximately
22.5 kg (50 lb). Always have two people available
to lift or turn over the transceiver.
q Remove the rack mounting handles from both
sides. See page 2-3 for rack mounting handle de-
tachment details.
w Remove the 8 screws from the top of the trans-
ceiver 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.
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 trans-
ceiver transmits and receives normally but cannot
retain the current time.
RWARNING! 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)
For Users in California (U.S.A.)
This CR2032 Lithium Battery contains Perchlorate
Material—special handling may apply.
See http://www.dtsc.ca.gov/hazardouswaste/perchlorate
13-6