22
KDC-BT6544U/BT6544UY
/BT7043U/BT742U
ROM DATA TRANSFER PROCESSES
4. In case of applying a new ROM correction when front-
end (A48x) is replaced (There is ROM correction data.)
5. In case of applying a new ROM correction even when
front-end (A48x) is not replaced.
FRONT-
END (A48x)
E2PROM
SYSTEM
μ
-COM (IC302)
Mother unit (X34-)
E2PROM circuit pattern
:
ROM correction
Tuner adjustment
Other
Install new E2PROM. (E2PROM that has been updated with
ROM correction)
FRONT-
END (A48x)
E2PROM
E2PROM
(IC300)
SYSTEM
μ
-COM (IC302)
Mother unit (X34-)
@
Turn power on.
Press and hold the [1] and [3] keys, 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 WRT)
Press
[ ]
key for 1 second or longer. (Data transfer)
FRONT-
END (A48x)
E2PROM
E2PROM
(IC300)
SYSTEM
μ
-COM (IC302)
Mother unit (X34-)
.
System
μ
-COM (IC302) copies
the ROM correction data on the
mother unit (X34-) into E2PROM
in the front-end (A48x)
WRT OK1
W-O1
In case of [4]
In case of [5]
Press [ ] key. (Exit ROM
data transfer mode.)
Press
[
]
(or
[
]
.) (Select READ)
Press
[ ]
key for 1 second or longer. (Data transfer)
FRONT-
END (A48x)
E2PROM
E2PROM
(IC300)
SYSTEM
μ
-COM (IC302)
Mother unit (X34-)
System
μ
-COM (IC302) copies
data in the front-end (A48x) into the
E2PROM on the mother unit (X34-).
(ROM correction and other data)
READ OK
R-OK
