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Turn power on.
Press and hold the [1] and [3] keys and press reset button.
(Enter the system in the test mode.)
Press [B.BOOST] key. (ROM data System enters data trans-
fer mode.)
Press
(or
.) (Select READ)
[
]
[
]
Press
key for 1 second or longer. (Data transfer)
[
]
Mother unit (X34-)
FRONT-
END (A48x)
E2PROM
The system μ-COM (IC302) copies
the data in the front-end (A48x) in the
E2PROM on the mother unit (X34-)
In case of [2]
READ OK
In case of [1] or [3]
READ OK2
Press
key. (Exit ROM data transfer mode.)
[
]
Turn power off.
Remove front-end (A48x).
Mother unit (X34-)
FRONT-
END (A48x)
ROM DATA TRANSFER PROCESSES
SYSTEM
μ-COM (IC302)
E2PROM
(IC300)
R-OK
R-O2
SYSTEM
μ-COM (IC302)
E2PROM
(IC300)
KDC-BT6544U/BT6544UY
/BT7043U/BT742U
Install new front-end (A48x).
No ROM correction or other data status.
Mother unit (X34-)
FRONT-
END (A48x)
E2PROM
Turn power on.
Press and hold the [1] and [3] keys and press reset button.
(Enter the system in the test mode.)
Press [B.BOOST] key. (Start transferring ROM data.)
Press
(or
.) (Select WRT)
[
]
[
]
Press
key for 1 second or longer. (Data transfer)
[
]
Mother unit (X34-)
FRONT-
END (A48x)
E2PROM
System μ-COM (IC302) copies
data on the mother unit (X34-) into
E2PROM in the front-end (A48x)
In case of [2] or [3]
WRT OK
In case of [1]
WRT OK2
Press
[
]
key. (Exit ROM data transfer mode.)
SYSTEM
μ-COM (IC302)
E2PROM
(IC300)
SYSTEM
μ-COM (IC302)
E2PROM
(IC300)
W-OK
W-O2
21
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