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13-6
■
Opening the transceiver’s case
Follow the case opening procedures shown here
when you want to replace the clock backup battery or
internal fuse.
R
WARNING! 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.
■
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 trans-
ceiver transmits and receives normally but cannot
retain the current time.
R
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
MAINTENANCE
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